Deep dive: Catalysis & electrochemistry for decarbonization — what's working, what's not, and what's next

Catalysis and electrochemistry sit at the core of nearly every major decarbonization pathway, from green hydrogen production and CO2 conversion to sustainable ammonia synthesis and industrial chemical manufacturing. The field has experienced an unprecedented acceleration since 2020, driven by falling renewable electricity costs, government hydrogen strategies across Asia-Pacific and Europe, and corporate net-zero commitments that demand alternatives to fossil-derived feedstocks. Yet the gap between laboratory breakthroughs and commercial deployment remains substantial: fewer than 15% of novel catalyst systems demonstrated at bench scale in 2020-2022 have progressed to pilot-scale validation, and electrolyzer manufacturing capacity still trails announced project pipelines by a factor of 2-3x. This deep dive assesses what is genuinely working, where persistent technical and economic barriers remain, and which developments are most likely to reshape the landscape over the next three to five years.

Why It Matters

The chemical industry consumes approximately 10% of global primary energy and generates 5.8 gigatonnes of CO2 annually, making it the third-largest industrial source of greenhouse gas emissions after cement and steel. Within this sector, catalytic processes underpin the production of over 85% of all manufactured chemicals, from ammonia (175 million tonnes per year) to methanol (110 million tonnes per year) to ethylene (200 million tonnes per year). Replacing thermochemical processes that rely on fossil fuel-derived heat and hydrogen with electrochemical alternatives powered by renewable electricity represents one of the highest-leverage decarbonization opportunities available.

Asia-Pacific is the epicenter of both the challenge and the opportunity. China alone accounts for approximately 45% of global chemical production and 55% of global electrolyzer manufacturing capacity. Japan and South Korea have committed $35 billion and $28 billion respectively to hydrogen economy strategies through 2030. Australia's Hydrogen Headstart programme has allocated AUD 2 billion in production credits for large-scale electrolyzer projects, while India's National Green Hydrogen Mission targets 5 million tonnes of annual green hydrogen production by 2030.

The economics have shifted dramatically. Proton exchange membrane (PEM) electrolyzer costs fell from approximately $1,400 per kW in 2020 to $700-900 per kW in 2025, with projections from BloombergNEF indicating $400-500 per kW by 2028 at scale. Alkaline electrolyzer costs, already lower at $500-700 per kW, are projected to reach $300-400 per kW. These cost trajectories, combined with renewable electricity prices below $30 per MWh in favorable geographies (Australia, Chile, parts of India and the Middle East), are bringing green hydrogen production costs within range of grey hydrogen parity in select markets.

Key Concepts

Electrocatalysis refers to catalytic processes that occur at electrode surfaces, where electrical potential drives chemical transformations. The defining advantage of electrocatalysis over thermocatalysis is its ability to use renewable electricity directly as the energy input, eliminating the thermodynamic losses associated with converting electricity to heat. Key electrocatalytic reactions for decarbonization include the hydrogen evolution reaction (HER), the oxygen evolution reaction (OER), CO2 reduction (CO2RR), and nitrogen reduction for ammonia synthesis (NRR).

Proton Exchange Membrane (PEM) Electrolysis uses a solid polymer electrolyte to separate hydrogen and oxygen production. PEM systems offer rapid response times (seconds to full load), high current densities (1-3 A/cm2), and compact footprints, making them well suited for coupling with variable renewable energy sources. The primary limitation is the requirement for iridium-based oxygen evolution catalysts, a platinum-group metal with extremely constrained supply (annual global production of approximately 7-8 tonnes).

Anion Exchange Membrane (AEM) Electrolysis represents an emerging alternative that combines the advantages of PEM systems (compact design, dynamic response) with the ability to use non-precious metal catalysts. AEM systems use nickel, cobalt, or iron-based catalysts instead of iridium and platinum, potentially reducing stack costs by 40-60%. However, membrane durability remains the critical bottleneck, with current AEM membranes demonstrating lifetimes of 5,000-15,000 hours compared to 60,000-80,000 hours for PEM membranes.

Solid Oxide Electrolysis (SOEC) operates at temperatures of 700-850 degrees Celsius, using thermal energy to reduce the electrical energy requirement for water splitting by 25-35%. SOEC systems are particularly attractive for integration with industrial processes that generate waste heat (steel mills, cement kilns, nuclear reactors) or for co-electrolysis of water and CO2 to produce syngas. Bloom Energy and Topsoe are the leading SOEC manufacturers, with Topsoe constructing a 500 MW annual manufacturing facility in Herning, Denmark, scheduled for completion in 2026.

CO2 Electroreduction uses electricity to convert captured CO2 into chemicals and fuels. The most commercially advanced pathway is CO2-to-CO (for syngas applications), where silver-based catalysts achieve Faradaic efficiencies above 95% at industrially relevant current densities. More ambitious targets include CO2-to-ethylene (currently at 70-80% Faradaic efficiency in laboratory settings) and CO2-to-ethanol (40-55% Faradaic efficiency), which could displace fossil-derived petrochemical feedstocks.

Catalysis and Electrochemistry KPIs: Benchmark Ranges

Metric	Below Average	Average	Above Average	Top Quartile
PEM Electrolyzer Efficiency (kWh/kg H2)	>58	52-58	48-52	<48
Alkaline Electrolyzer Efficiency (kWh/kg H2)	>56	50-56	46-50	<46
Catalyst Loading (PEM anode, mg Ir/cm2)	>2.0	1.0-2.0	0.3-1.0	<0.3
Stack Lifetime (PEM, hours)	<40,000	40,000-60,000	60,000-80,000	>80,000
CO2RR Faradaic Efficiency (CO)	<85%	85-92%	92-97%	>97%
Green H2 Production Cost ($/kg)	>5.00	3.50-5.00	2.00-3.50	<2.00
Electrolyzer Capacity Factor	<30%	30-50%	50-70%	>70%

What's Working

PEM Electrolysis Scale-Up in Asia-Pacific

China's electrolyzer manufacturing capacity reached approximately 35 GW per year by the end of 2025, accounting for over 60% of global capacity. Leading manufacturers including LONGi Hydrogen, Sungrow, and Peric Hydrogen have driven alkaline electrolyzer costs below $300 per kW at scale, while PEM systems from domestic producers have reached $600-800 per kW. This manufacturing scale has enabled projects such as the Sinopec Kuqa green hydrogen plant in Xinjiang (260 MW alkaline electrolysis, operational since 2023), the world's largest single-site green hydrogen facility. The plant produces approximately 20,000 tonnes of hydrogen annually, displacing natural gas-derived hydrogen at Sinopec's Tahe refinery. Measured performance data indicates an average electrolyzer efficiency of 52.4 kWh per kilogram of hydrogen, consistent with manufacturer specifications.

Japan's approach has focused on SOEC technology, leveraging the country's strength in ceramic materials science. Toshiba's 100 kW SOEC demonstration at the Fukushima Hydrogen Energy Research Field achieved steam electrolysis efficiency of 42.5 kWh per kilogram when coupled with industrial waste heat, a 25% improvement over PEM electrolysis operating without thermal integration. Japan's Green Innovation Fund has allocated JPY 370 billion ($2.5 billion) to next-generation electrolyzer development, with a target of achieving $3 per kilogram green hydrogen by 2030.

Heterogeneous Catalysis for Ammonia

The Haber-Bosch process, which consumes approximately 1.8% of global primary energy and generates 1.4% of global CO2 emissions, has been the primary target for catalytic decarbonization. Conventional iron-based catalysts require temperatures of 400-500 degrees Celsius and pressures of 150-300 bar, conditions that necessitate natural gas-derived hydrogen and substantial energy input. Recent developments in ruthenium-based catalysts supported on electride materials (particularly Ca2NH and 12CaO-7Al2O3) have demonstrated ammonia synthesis at 300-350 degrees Celsius and 10-50 bar, conditions compatible with electrically heated reactors and green hydrogen feed.

Tsubame BHB, a Japanese startup spun out of the Tokyo Institute of Technology, is operating a 20 tonne-per-day pilot plant using an electride-supported ruthenium catalyst, producing ammonia at conditions that reduce energy consumption by approximately 20% compared to conventional Haber-Bosch. CF Industries has partnered with Thyssenkrupp and Bloom Energy to integrate SOEC-derived hydrogen into an existing ammonia plant in Donaldsonville, Louisiana, targeting 20,000 tonnes per year of green ammonia by 2026.

CO2 Electrolysis to Carbon Monoxide

The CO2-to-CO pathway has emerged as the most commercially viable CO2 electroreduction route, with Twelve (formerly Opus 12) and OCOchem leading deployment. Twelve's technology uses a membrane electrode assembly with silver-based catalysts to convert captured CO2 and water into CO and oxygen at Faradaic efficiencies exceeding 95%. The CO is then combined with green hydrogen via Fischer-Tropsch synthesis to produce sustainable aviation fuel and chemical feedstocks. Twelve's partnership with the U.S. Air Force demonstrated production of e-jet fuel meeting ASTM D7566 specifications, and the company is constructing a commercial-scale facility in Moses Lake, Washington, targeting initial production of 50,000 gallons of sustainable aviation fuel annually.

What's Not Working

Iridium Scarcity for PEM Scaling

The single most significant constraint on PEM electrolyzer deployment is the limited supply of iridium for oxygen evolution catalysts. Global iridium production is approximately 7-8 tonnes per year (primarily as a byproduct of platinum mining in South Africa), and current PEM electrolyzers require 0.5-2.0 mg/cm2 of iridium anode loading. At the midpoint of current loadings, achieving the IEA's 2030 scenario of 134 GW of PEM electrolyzer capacity would require 30-40% of current annual iridium production, creating an obvious supply bottleneck. Research into iridium-free or ultralow-iridium catalysts (using ruthenium oxide, manganese oxide, or mixed-metal perovskites) has shown promise in laboratory settings, but none have demonstrated the combination of activity, stability, and conductivity required for commercial PEM systems. The most pragmatic near-term solutions involve reducing iridium loadings to 0.1-0.3 mg/cm2 through nanostructured thin-film catalysts (3M's NSTF approach) or transitioning to AEM systems that avoid precious metals entirely.

Electrochemical Nitrogen Reduction

Despite hundreds of publications claiming electrochemical ammonia synthesis from nitrogen and water at ambient conditions, the field has been plagued by irreproducibility and contamination artifacts. A landmark 2019 study in Nature demonstrated that many reported nitrogen reduction results were attributable to trace ammonia contamination in reagents, membranes, and laboratory air rather than genuine electrocatalytic activity. Subsequent rigorous studies using isotope-labeled nitrogen (15N2) as a control have established that true electrochemical nitrogen reduction rates remain orders of magnitude below commercial relevance, with Faradaic efficiencies typically below 10% and production rates below 10 nanomoles per second per square centimeter. The consensus among leading electrochemistry research groups is that direct electrochemical nitrogen fixation at ambient conditions is unlikely to achieve commercial viability within the next decade.

Durability of CO2 Reduction Catalysts

While Faradaic efficiencies for CO2 electroreduction to multi-carbon products (ethylene, ethanol) have reached impressive levels in short-duration laboratory experiments, catalyst stability over thousands of hours of continuous operation remains a critical unsolved problem. Copper-based catalysts, the only known materials capable of producing C2+ products with meaningful selectivity, undergo surface restructuring, oxidation state changes, and poisoning by electrolyte impurities during extended operation. Published stability data typically covers 100-500 hours, far short of the 20,000-40,000 hours required for commercial competitiveness. Salt precipitation and carbonate formation in the gas diffusion layer further degrade cell performance over time, with most reported systems losing 20-40% of initial performance within 1,000 hours.

What's Next

AEM Electrolysis Commercialization

AEM technology represents the most promising pathway to resolving the iridium bottleneck while maintaining the dynamic response and compact design advantages of PEM systems. Enapter (Germany/Italy) has shipped over 3,800 AEM electrolyzer modules and is commissioning a mass-production facility in Saerbeck, Germany, targeting 10,000 units per year. Ionomr Innovations (Canada) has developed a hydrocarbon-based AEM membrane demonstrating over 12,000 hours of stability in accelerated testing, with a pathway to 30,000+ hours through ongoing polymer chemistry optimization. The key milestone to watch is whether any AEM manufacturer achieves independently verified membrane lifetimes exceeding 20,000 hours by 2027, which would make the technology cost-competitive with alkaline systems while offering superior dynamic performance.

Plasma-Assisted Catalysis

Non-thermal plasma combined with catalytic surfaces offers a pathway to activating stable molecules (N2, CO2, CH4) at near-ambient conditions without the extreme temperatures and pressures of conventional thermocatalysis. The University of Antwerp's PLASMANT group has demonstrated plasma-catalytic CO2 conversion to CO at energy efficiencies of 40-50%, approaching the theoretical thermodynamic minimum. Plasma catalysis also shows potential for distributed ammonia synthesis at scales (1-10 tonnes per day) that could serve agricultural demand locally, reducing the transportation costs that represent 10-20% of delivered ammonia prices. Commercial deployment is expected to begin at pilot scale (2028-2030) for applications where distributed production offers logistical advantages over centralized Haber-Bosch plants.

Machine Learning-Accelerated Catalyst Discovery

Computational screening using density functional theory (DFT) and machine learning surrogate models is dramatically compressing the timeline from catalyst concept to experimental validation. Meta's Open Catalyst Project, which trained graph neural networks on over 1.5 billion DFT calculations, reduced the time required to screen candidate catalyst surfaces from months to hours. Microsoft's collaboration with Pacific Northwest National Laboratory used AI to identify a novel solid-state lithium conductor from a pool of 32 million candidates in under 80 hours. Applied to electrocatalysis, these tools are being used to identify non-precious metal catalysts for oxygen evolution, CO2 reduction, and nitrogen activation. The most impactful near-term applications involve optimizing existing catalyst families (alloy compositions, support interactions, defect engineering) rather than discovering entirely new material classes.

Key Players

Established Leaders

ITM Power (UK) manufactures PEM electrolyzers and operates a 1.5 GW annual capacity Gigafactory in Sheffield. Their partnership with Linde provides engineering, procurement, and construction services for large-scale hydrogen projects globally.

Thyssenkrupp nucera (Germany) is the leading alkaline electrolyzer manufacturer with over 10 GW of installed capacity across its history. Their 20 MW standard module design targets industrial-scale green hydrogen projects.

Topsoe (Denmark) is the market leader in heterogeneous catalysis for ammonia, methanol, and hydrogen production. Their SOEC technology, targeting 500 MW of annual manufacturing capacity by 2026, positions them as a vertically integrated player across electrolysis hardware and catalyst supply.

Emerging Startups

Twelve (US) commercializes CO2 electrolysis technology for sustainable aviation fuel and chemicals, with backing from Capricorn Investment Group and the U.S. Department of Defense.

Enapter (Germany) is scaling AEM electrolysis for distributed hydrogen production, targeting sub-$500/kW system costs through mass manufacturing.

Tsubame BHB (Japan) develops electride-supported catalysts enabling low-temperature, low-pressure ammonia synthesis for distributed fertilizer production.

Key Investors and Funders

Breakthrough Energy Ventures has invested in multiple electrochemistry startups including Twelve, Koloma, and Form Energy, with a focus on technologies that can achieve gigaton-scale emissions reductions.

ARPA-E (US Department of Energy) funds high-risk, high-reward research in electrochemical energy conversion, including programmes on hydrogen production, CO2 utilization, and nitrogen fixation.

Japan's Green Innovation Fund represents the largest single-country commitment to electrolyzer technology development at JPY 370 billion ($2.5 billion), with targeted investments across PEM, alkaline, AEM, and SOEC platforms.

Action Checklist

• Evaluate electrolyzer technology options (alkaline, PEM, AEM, SOEC) against site-specific renewable energy profiles and waste heat availability
• Assess iridium exposure risk for PEM-dependent hydrogen strategies and develop contingency plans including AEM alternatives
• Map regional green hydrogen cost trajectories against grey hydrogen prices to identify economic tipping points for your geography
• Engage with catalyst suppliers on roadmaps for iridium loading reduction and non-precious metal alternatives
• Monitor AEM membrane durability data from Enapter, Ionomr, and academic groups as a key indicator of technology readiness
• Establish partnerships with computational screening groups (Open Catalyst, academic DFT labs) for catalyst optimization
• Design pilot projects with rigorous isotope-labeling protocols when evaluating novel nitrogen reduction claims
• Integrate carbon capture infrastructure planning with CO2 electrolysis deployment timelines

FAQ

Q: What is the current cost of green hydrogen from electrolysis, and when will it reach parity with grey hydrogen? A: Green hydrogen costs range from $3.50-6.00 per kilogram in most geographies as of early 2026, compared to $1.00-2.50 for grey hydrogen (depending on natural gas prices). The most favorable locations (Australia, Chile, Middle East) are approaching $2.50-3.00 per kilogram. Parity is expected in regions with abundant cheap renewables by 2028-2030, and more broadly by 2032-2035, contingent on electrolyzer cost reductions and carbon pricing implementation.

Q: Which electrolyzer technology is best for coupling with intermittent renewables? A: PEM electrolyzers offer the fastest dynamic response (seconds to full load) and widest operating range (10-160% of nominal capacity), making them the preferred choice for direct coupling with wind or solar without battery buffering. AEM systems share similar dynamic characteristics. Alkaline electrolyzers require 30-60 minutes for cold start and perform best at steady-state operation, making them better suited for baseload hydrogen production or systems with intermediate battery storage. SOEC systems, with their high operating temperatures, require the most stable power input and are best paired with nuclear or geothermal rather than variable renewables.

Q: How close is CO2 electrolysis to commercial viability for chemical production? A: CO2-to-CO electrolysis is commercially viable today for applications where the CO feeds into existing syngas infrastructure and the products command a sustainability premium (such as sustainable aviation fuel). CO2-to-ethylene and CO2-to-ethanol remain 5-8 years from commercial deployment, primarily due to catalyst durability limitations and the need for system costs to fall below $500 per tonne of CO2 converted. Current system costs are estimated at $800-1,200 per tonne.

Q: Is electrochemical ammonia synthesis a viable alternative to Haber-Bosch? A: Not directly via electrochemical nitrogen reduction, which remains at laboratory curiosity stage despite extensive research. The commercially viable pathway is indirect: green hydrogen from electrolysis fed into modified Haber-Bosch reactors operating at lower temperatures and pressures using advanced catalysts. This approach, demonstrated by Tsubame BHB and others, achieves 20% energy savings and eliminates CO2 emissions from hydrogen production, which accounts for 75-80% of conventional ammonia's carbon footprint.

Q: What role does Asia-Pacific play in the global electrolyzer supply chain? A: Asia-Pacific, led by China, dominates electrolyzer manufacturing with approximately 65-70% of global production capacity. China's alkaline electrolyzer costs ($200-350 per kW) are 40-60% lower than Western equivalents, driven by manufacturing scale and supply chain integration. Japan leads in SOEC technology development, while South Korea's Hyundai and SK Group are investing heavily in PEM and hydrogen fuel cell systems. This manufacturing concentration creates both opportunities (lower hardware costs globally) and risks (supply chain dependency, technology transfer concerns) for projects outside the region.

Sources

• International Energy Agency. (2025). Global Hydrogen Review 2025. Paris: IEA Publications.
• BloombergNEF. (2025). Hydrogen Economy Outlook: Electrolyzer Cost Benchmarks Q4 2025. New York: Bloomberg LP.
• Nature Catalysis. (2024). "Rigorous protocols for electrochemical nitrogen reduction: Lessons from five years of isotope-labeled experiments." Nature Catalysis, 7(3), 215-228.
• Topsoe. (2025). SOEC Technology: Performance Data and Manufacturing Roadmap. Kongens Lyngby: Topsoe A/S.
• Meta FAIR. (2025). Open Catalyst Project: Progress Report and Benchmark Results. Menlo Park: Meta Platforms.
• Sinopec. (2025). Kuqa Green Hydrogen Project: First Full Year Operational Performance Report. Beijing: China Petroleum & Chemical Corporation.
• U.S. Department of Energy. (2025). Hydrogen Shot: Progress Toward $1/kg Green Hydrogen. Washington, DC: DOE.
• Enapter. (2025). AEM Electrolysis: Technology Status and Manufacturing Scale-Up Update. Saerbeck: Enapter AG.