FeNi LDH/V2CTx/NF as Self-Supported Bifunctional Electrocatalyst for Highly Effective Overall Water Splitting

Liming Yang; Tao Yang; Yafeng Chen; Yapeng Zheng; Enhui Wang; Zhentao Du; Kuo-Chih Chou; Xinmei Hou

doi:10.3390/nano12152640

FeNi LDH/V₂CT_x/NF as Self-Supported Bifunctional Electrocatalyst for Highly Effective Overall Water Splitting

Nanomaterials (Basel). 2022 Jul 31;12(15):2640. doi: 10.3390/nano12152640.

Authors

Liming Yang¹, Tao Yang¹, Yafeng Chen¹, Yapeng Zheng¹, Enhui Wang¹, Zhentao Du², Kuo-Chih Chou¹, Xinmei Hou¹

Affiliations

¹ Beijing Advanced Innovation Center for Materials Genome Engineering, Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China.
² MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China.

Abstract

The development of bifunctional electrocatalysts with efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is still a key challenge at the current stage. Herein, FeNi LDH/V₂CT_x/nickel foam (NF) self-supported bifunctional electrode was prepared via deposition of FeNi LDH on V₂CT_x/NF substrate by hydrothermal method. Strong interfacial interaction between V₂CT_x/NF and FeNi LDH effectively prevented the aggregation of FeNi LDH, thus exposing more catalytic active sites, which improved electrical conductivity of the nanohybrids and structural stability. The results indicated that the prepared FeNi LDH/V₂CT_x/NF required 222 mV and 151 mV overpotential for OER and HER in 1 M KOH to provide 10 mA cm^-2, respectively. Besides, the FeNi LDH/V₂CT_x/NF electrocatalysts were applied to overall water splitting, which achieved a current density of 10 mA cm^-2 at 1.74 V. This work provides ideas for improving the electrocatalytic performance of electrocatalysts through simple synthesis strategies, structural adjustment, use of conductive substrates and formation of hierarchical structures.

Keywords: V2CTx MXene; layered double hydroxide; nanohybrids; overall water splitting.

Abstract

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