Evaluation of HER and OER electrocatalytic activity over RuO2–Fe2O3 nanocomposite deposited on HrGO nanosheets

纳米复合材料 分解水 塔菲尔方程 析氧 X射线光电子能谱 材料科学 拉曼光谱 化学工程 石墨烯 催化作用 交换电流密度 氧化物 纳米技术 无机化学 化学 电化学 电极 物理化学 冶金 有机化学 光催化 光学 物理 工程类
作者
Hamta Mosallaei,Hassan Hadadzadeh,Ali A. Ensafi,Kimia Zarean Mousaabadi,Matthias Weil,Annette Foelske,Markus Sauer
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:48 (5): 1813-1830 被引量:31
标识
DOI:10.1016/j.ijhydene.2022.10.026
摘要

Electrochemical water-splitting efficiency is determined by both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts. Therefore, designing a bi-functional configuration is essential for an efficient HER and OER catalytic performance under the same experimental conditions. In this study, a novel ionic pentanuclear complex of the type [Ru(dmbpy)3]3[Fe(CN)6]2, where dmbpy = 4,4′-dimethyl-2,2′-bipyridine, has been synthesized and characterized by structural (X-ray), analytical (CHN), and spectral (FT–IR, UV–Vis) methods. Highly reduced graphene oxide nanosheets (HrGO NSs) supported RuO2–Fe2O3 nanocomposite were prepared by an impregnation method using [Ru(dmbpy)3]3[Fe(CN)6]2 as a precursor and HrGO NSs as a support. The RuO2–Fe2O3/HrGO NSs nanocomposite was characterized by means of spectroscopy (XPS, FT–IR, and FT–Raman), surface area (BET/BJH), diffraction (XRD), thermal (TGA), and electron microscopy (TEM and FE–SEM) analyses. The electrocatalytic HER, OER, and overall water-splitting activities of RuO2–Fe2O3/HrGO NSs, RuO2–Fe2O3, RuO2/HrGO, Fe2O3/HrGO, and HrGO in 1 M KOH solution were studied. According to the overpotentials of −239 and 386 mV (vs. RHE) at 10 mA cm−2 current density, the exchange current densities of 0.0641 and 0.389 × 10−4 mA cm−2, the Tafel slopes of 97 and 67 mV dec−1, and the charge-transfer resistance values of 38.57 and 31.5 Ω for HER and OER, respectively, the RuO2–Fe2O3/HrGO NSs nanocomposite possesses bi-functional catalytic capabilities toward both hydrogen and oxygen evolution reactions. The catalytic performance is enhanced by the high surface area, the high number of catalytically active sites, the presence of nanoparticles with different morphologies, and the synergistic interaction between RuO2–Fe2O3 nanoparticles and HrGO nanosheets.
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