Electrochemical converting ethanol to hydrogen and acetic acid for large scale green hydrogen production
Yufeng Zhang, Wei Zhu, Jinjie Fang, Zhiyuan Xu, Yanrong Xue, Jiajing Pei, Rui Sui, Xingdong Wang, Xuejiang Zhang, Zhongbin Zhuang
Abstract
Electrochemical coupling hydrogen evolution with biomass reforming reaction (named electrochemical hydrogen and chemical cogeneration (EHCC)), which realizes green hydrogen production and chemical upgrading simultaneously, is a promising method to build a carbon-neutral society. Herein, we analyze the EHCC process by considering the market assessment. The ethanol to acetic acid and hydrogen approach is the most feasible for large-scale hydrogen production. We develop AuCu nanocatalysts, which can selectively oxidize ethanol to acetic acid (> 97%) with high long-term activity. The isotopic and in-situ infrared experiments reveal that the promoted water dissociation step by alloying contributes to the enhanced activity of the partial oxidation reaction path. A flow-cell electrolyzer equipped with the AuCu anodic catalyst achieves the steady production of hydrogen and acetic acid simultaneously in both high selectivity (> 90%), demonstrating the potential scalable application for green hydrogen production with low energy consumption and high profitability.