Single-Atom and Bimetallic Nanoalloy Supported on Nanotubes as a Bifunctional Electrocatalyst for Ultrahigh-Current-Density Overall Water Splitting

Luo, Wenhui, Wang, Yang, Luo, Liuxiong, Gong, Shen, Wei, Mengni, Li, Yixuan, Gan, Xueping, Zhao, Yuyuan ORCID: 0000-0003-2356-8435, Zhu, Zhenghong and Li, Zhou (2022) Single-Atom and Bimetallic Nanoalloy Supported on Nanotubes as a Bifunctional Electrocatalyst for Ultrahigh-Current-Density Overall Water Splitting. ACS Catalysis, 12 (2). pp. 1167-1179.

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Official URL: http://dx.doi.org/10.1021/acscatal.1c04454

Abstract

Developing exceedingly efficient, cost-effective, and environmentally friendly bifunctional catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) especially at high current density is crucial for realizing the industrial application of electrocatalytic overall water splitting. In this work, non-noble-metal bifunctional catalysts with single Ni atoms, single Fe atoms, and NiFe nanoalloys supported on carbon nanotubes (NiSAFeSA-NixFe/CNT) are rationally designed and fabricated. In 1 M KOH, the optimized NiSAFeSA-Ni50Fe/CNT catalyst affords low overpotentials of 64 and 227 mV at 10 mA cm–2 for catalyzing the HER and OER, respectively. Moreover, the catalyst enables the overall water splitting at a low cell voltage of 1.49 V to achieve 10 mA cm–2 in 1 M KOH. At a cell voltage of 1.80 V, the current density is as high as 382 mA cm–2, which surpasses those of most materials reported so far. After a simple two-step oxidation and rereduction procedure, the catalytic performances of the OER, HER, and overall water splitting recover completely to their original levels. This work not only provides a potential catalyst candidate for economically realizing water splitting but also shows a method for reactivatable catalyst design.

Item Type:	Article
Uncontrolled Keywords:	bifunctional electrocatalyst, single atom, bimetallic nanoalloy, oxygen evolution reaction, hydrogen evolution reaction, overall water splitting
Divisions:	Faculty of Science and Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	13 Jan 2022 11:40
Last Modified:	18 Jan 2023 21:16
DOI:	10.1021/acscatal.1c04454
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3146215