非阻塞I/O
塔菲尔方程
X射线光电子能谱
材料科学
电催化剂
镍
化学工程
电极
纳米颗粒
电解
电化学
纳米技术
催化作用
冶金
化学
物理化学
生物化学
电解质
工程类
作者
Ioannis A. Poimenidis,Maria Lykaki,S. Moustaizis,P. A. Loukakos,Michalis Konsolakis
标识
DOI:10.1016/j.matchemphys.2023.128007
摘要
Herein we report for the first time on the in situ solvothermal growth of NiO nanoparticles on nickel foam (NF) electrodes towards enhancing the active electrochemical area and, in turn, the hydrogen evolution reaction (HER). In particular, the Ni amount deposited on the NF electrode was thoroughly explored by varying the Ni precursor content (0–64 mmol of Ni(NO3)2·6H2O) during one-step solvothermal synthesis. A volcano-type dependency on Ni precursor amount was revealed, with the optimum performance being obtained by NiO@NF-16 (16 mmol Ni(NO3)2·6H2O). The NiO@NF-16 sample exhibited the lowest overpotentials |η10| = 109 mV, |η100| = 193 mV, the lowest Tafel slope (103.9 mV dec−1), and the highest current density during electrolysis (1947 mA cm−2). To gain insight into structure-performance relationships, the electrodes were thoroughly characterized by means of field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). It was revealed that the improved electrochemical characteristics of NiO@NF-16 electrode could be mainly attributed to the uniform growth and high dispersion of NiO nanoparticles on nickel foam, which, in turn, results in a high electrochemically active surface area (ECSA), which is ca. 55 times higher than that of NF electrode.
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