Challenge and opportunity in scaling-up hydrogen production via electrochemical ammonia electrolysis process

Abstract

Hydrogen as a clean carrier has received considerable attention due to its potential in sustainable energy systems. However, the prevalent hydrogen production methods, notably steam reforming from natural gas, present environmental challenges, primarily CO2 emissions. In here, we aim to provide insights into the scalability of hydrogen production through electrochemical ammonia electrolysis to hydrogen production (eAEH), proposing ammonia as an effective hydrogen carrier to mitigate these environmental concerns. Our focus is on the ammonia oxidation reaction (AOR) within the electrochemical decomposition framework, underscoring the operation at a low reversible cell voltage to significantly enhance energy efficiency. We explore strategies to scale up eAEH, analyzing the potential and limitations of various electrocatalysts, and examining the feasibility of employing machine learning techniques for optimal catalyst selection. Thus, the AOR research represents a pivotal technological innovation for the sustainable energy transition, potentially establishing a critical foundation for advancing a hydrogen economy. © 2024 Elsevier B.V.