UHの研究者が海水からグリーン水素への変換に成功(UH Researchers Make Inroads in Converting Seawater to Green Hydrogen)


2022-05-04 ヒューストン大学(UH)

Zhifeng Ren (right), M.D. Anderson chair professor and director of The Texas Center for Superconductivity at the University of Houston (TcSUH), demonstrates his research group’s seawater electrolysis experiment for professor Paul Chu (left), TcSUH’s founding director and chief scientist.



均一系多金属層状複水酸化物電極触媒による海水酸化の高性能化 High-performance seawater oxidation by a homogeneous multimetallic layered double hydroxide electrocatalyst

Luo Yu, Jiayong Xiao, Chuqiang Huang, Jianqing Zhou, Ming Qiu, Ying Yu, Zhifeng Ren zren, Ching-Wu Chu , and Jimmy C. Yu
Proceedings of the National Academy of Sciences  Published: April 27, 2022


Seawater electrolysis is an intriguing technology for sustainable hydrogen production that will not exacerbate the global shortage of freshwater or increase carbon emissions. However, due to the undesirable anodic chlorine evolution reaction and the strong corrosiveness of seawater, this technology is significantly hindered by a lack of robust oxygen evolution reaction (OER) electrocatalysts that exhibit high activity, high selectivity, and good stability. Here, we demonstrate a homogeneous multimetallic catalyst consisting of Ni and Fe coincorporated into CuCo layered double hydroxide (denoted as NiFe-CuCo LDH) that serves as an active and durable OER electrode for high-performance seawater electrolysis. With abundant exposed multimetal sites and well-defined micronanostructures, the NiFe-CuCo LDH catalyst requires overpotentials of only 259, 278, and 283 mV to yield current densities of 100, 300, and 500 mA cm−2, respectively, in 6 M KOH seawater electrolyte. Moreover, it exhibits very high OER selectivity (Faradaic efficiency of 97.4% for O2 at 500 mA cm−2) and superior durability during operation, working stably under a large current density of 500 mA cm−2 for up to 500 h in 6 M KOH seawater electrolyte. This multimetallic electrocatalyst is one of the best performing ones among all reported transition-metal-based OER electrocatalysts in alkaline seawater electrolyte, which boosts the development of seawater electrolysis technology.