IIT Madras Study Finds Electrolyser Design Can Cut Green Hydrogen Emissions by Up to 25 Percent, Flags Material Risks
A recent study conducted by researchers at IIT Madras has revealed that the design of electrolysers can significantly impact the emissions associated with green hydrogen production. The findings indicate that certain electrolyser configurations can lead to emissions reductions of up to 25 percent over their operational lifetime. However, these benefits come at the cost of increased material intensity during manufacturing.
Key Findings of the Study
The research, led by Satyanarayanan Seshadri in collaboration with the Centre for Study of Science, Technology and Policy (CSTEP), provides a comprehensive analysis of the life cycle and critical raw materials involved in green hydrogen production in India. The results were published in the peer-reviewed journal Energy & Fuels of the American Chemical Society.
Importance of Electrolyser Design
According to the study, technology choices in electrolysers can significantly alter the environmental impact of green hydrogen. The researchers found that proton-exchange membrane (PEM) electrolysers equipped with coated bipolar plates produce cleaner hydrogen over their operational life, despite higher emissions during the manufacturing process. This highlights the importance of careful technology selection as India seeks to enhance its green hydrogen capabilities.
India’s Green Hydrogen Goals
India has set ambitious targets for reducing carbon emissions, committing to net-zero emissions by 2070 and aiming for 50 percent of its electricity demand to be met from non-fossil sources by 2030. Green hydrogen is considered a crucial component in decarbonizing sectors that are traditionally hard to abate, such as industry, transport, and buildings.
Durability vs. Embedded Emissions
A significant finding of the study is the trade-off between the durability of electrolysers and their embedded emissions. The researchers discovered that coating bipolar plates with electrocatalysts leads to a sharp increase in manufacturing emissions. However, this coating also enhances the electrolyser’s lifespan and efficiency, resulting in hydrogen production with a substantially lower carbon footprint over time compared to uncoated systems.
Material Risks and Supply Chain Concerns
The study also raises concerns regarding the availability of critical raw materials necessary for PEM electrolysers, including platinum, iridium, and ruthenium. These materials are primarily imported, which poses risks to the supply chain as India aims to achieve an annual production target of 5 million tonnes of green hydrogen by 2030 under the National Green Hydrogen Mission.
Proposed Classification System for Green Hydrogen
To address the wide variations in emission footprints across different technologies, the researchers propose a tiered classification system for green hydrogen. This system categorizes hydrogen into four tiers: platinum, gold, silver, and bronze. Such a classification aims to enhance transparency in hydrogen labeling and support domestic policies as well as future international trade.
Implications for Policy and Industry
Peter Waiyaki, a research scholar at IIT Madras and co-author of the study, emphasized the need for standards that consider life-cycle emissions rather than solely the source of electricity. He stated, “This will be essential to ensure India’s green hydrogen expansion is both credible and sustainable.” The insights from this research are critical for policymakers and industry stakeholders as they navigate the complexities of scaling up green hydrogen production.
Future Directions
The authors of the study believe that their research lays the groundwork for future investigations into detailed life-cycle datasets, production pathways, and the availability of materials. This work offers a practical roadmap for building a resilient and sustainable green hydrogen sector in India.
Conclusion
The IIT Madras study underscores the importance of electrolyser design in minimizing emissions associated with green hydrogen production. As India strives to meet its ambitious green hydrogen targets, careful consideration of technology choices and material availability will be crucial in ensuring a sustainable and credible transition to a low-carbon economy.
Note: The findings of this study are pivotal for understanding the complexities involved in green hydrogen production and the implications for environmental sustainability in India.
