塔菲尔方程
电催化剂
析氧
过电位
分解水
电解
材料科学
催化作用
制氢
电解水
无机化学
化学工程
化学
光催化
电极
电化学
物理化学
电解质
工程类
生物化学
作者
Iqbal Ahmad,Jawad Ahmed,Saima Batool,Muhammad Nadeem Zafar,Amna Hanif,Zahidullah,Muhammad Faizan Nazar,Anwar Ul-Hamıd,Uzma Jabeen,A. Dahshan,Muhammad Idrees,Syeda Aaliya Shehzadi
标识
DOI:10.1016/j.jallcom.2021.162409
摘要
The production of an inexpensive, highly active electrocatalyst for a simple oxygen evolution reaction (OER) based on earth-abundant transition metals is still a major challenge. In addition, the ambiguity of the water splitting reaction (hydrogen evolution and OER) is a hurdle in the manufacture of suitable catalysts for the efficient water electrolysis process. Here, the synthesis of iron oxide/iron phosphide (Fe2O3/FeP) heterostructure and its counterparts Fe2O3 and FeP as cheap electrocatalysts for water electrolysis is presented. Characterization techniques such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were used to analyze the structure of these electrocatalysts. Heterostructure Fe2O3/FeP has been shown to be a more active electrocatalyst than its counterparts. It initiates OER at a remarkably low potential of 1.49 V vs. reverse hydrogen electrode (RHE). For this electrocatalyst, a current density of 10 mA/cm2 is achieved at an overpotential of 264 mV for OER in 1.0 M potassium hydroxide solution and the value of the Tafel slope is 47 mV dec−1, outperforming its complements (Fe2O3 and FeP) under similar conditions. The results obtained are superior to those of previously reported Fe-based OER electrocatalysts. The Fe2O3/FeP electrocatalyst has proven its long-term stability by driving OER at 1.65 V (vs. RHE) for about 12.5 h.
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