Boride-derived oxygen-evolution catalysts

Ning Wang, Aoni Xu, Pengfei Ou, Sung Fu Hung, Adnan Ozden, Ying Rui Lu, Jehad Abed, Ziyun Wang, Yu Yan, Meng Jia Sun, Yujian Xia, Mei Han, Jingrui Han, Kaili Yao, Feng Yi Wu, Pei Hsuan Chen, Alberto Vomiero, Ali Seifitokaldani, Xuhui Sun, David SintonYongchang Liu*, Edward H. Sargent, Hongyan Liang

*此作品的通信作者

研究成果: Article同行評審

24 引文 斯高帕斯(Scopus)

摘要

Metal borides/borates have been considered promising as oxygen evolution reaction catalysts; however, to date, there is a dearth of evidence of long-term stability at practical current densities. Here we report a phase composition modulation approach to fabricate effective borides/borates-based catalysts. We find that metal borides in-situ formed metal borates are responsible for their high activity. This knowledge prompts us to synthesize NiFe-Boride, and to use it as a templating precursor to form an active NiFe-Borate catalyst. This boride-derived oxide catalyzes oxygen evolution with an overpotential of 167 mV at 10 mA/cm2 in 1 M KOH electrolyte and requires a record-low overpotential of 460 mV to maintain water splitting performance for over 400 h at current density of 1 A/cm2. We couple the catalyst with CO reduction in an alkaline membrane electrode assembly electrolyser, reporting stable C2H4 electrosynthesis at current density 200 mA/cm2 for over 80 h.

原文English
文章編號6089
期刊Nature Communications
12
發行號1
DOIs
出版狀態Published - 12月 2021

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