Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7706529 | International Journal of Hydrogen Energy | 2018 | 8 Pages |
Abstract
Electrochemical water splitting is a promising technology for mass hydrogen production. Efficient, stable, and cheap electrocatalysts are keys to realizing this strategy. However, high price and preciousness of commonly used noble metal based catalysts severely hinder this realization. Herein, we report nickel iron phosphide (Ni-FexP) bifunctional electrocatalyst via the in-situ growth of NiFe(OH)x on nickel foam (NiFe(OH)x/NF) followed by low-temperature phosphidation. As a hydrogen evolution reaction (HER) catalyst, the Ni-FexP/NF only needs an overpotential of 119Â mV to drive a current density of â10Â mA/cm2 in a base media. It also shows excellent activity toward oxygen evolution reaction (OER) with low overpotentials of 254Â mV, 267Â mV, and 282Â mVÂ at 50, 100 and 200Â mA/cm2, respectively. Moreover, when this bifunctional catalyst is used for overall water splitting, a low cell voltage of 1.62Â V is needed to deliver a current density of 10Â mA/cm2, which is superior to commercial electrolyzer and it also shows remarkable stability.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Chi Zhang, Yunchao Xie, Heng Deng, Cheng Zhang, Jheng-Wun Su, Yuan Dong, Jian Lin,