Faceted and defect-rich CuMn2O4 nanoparticles for efficient electrochemical water splitting,Journal of Materials Chemistry A

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Faceted and defect-rich CuMn2O4 nanoparticles for efficient electrochemical water splitting
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-03 , DOI: 10.1039/d2ta03205h
Balasubramanian Jansi Rani _{1,

2} , Arumugam Sivanantham _{1,

3} , Tatachari Santhanagopalan Shridharan _{1,

3} , Tan Runfa _{1,

3} , In Sun Cho _{1,

3}

Affiliation

Facet engineering, which exposes desired crystal planes, is an effective method for manipulating the surface adsorption and catalytic reactivity of electrocatalysts used in water splitting. Herein, we report the synthesis of faceted CuMn₂O₄ (f-CMO) nanoparticles via polyol-mediated annealing, in which ethylene glycol plays a crucial role in the formation of phase-pure and faceted CMO. We found that f-CMO has many facets, oxygen vacancies, and high electrical conductivity. Hence, its electrocatalytic water splitting activity was investigated to elucidate the impact of facet formation. Significantly, the f-CMO electrode exhibited superior hydrogen evolution reaction activity (overpotential: 116 mV and Tafel slope: 115 mV/dec) than non-f-CMO (239 mV and 163 mV/dec) at −10 mA cm⁻² in 1 M KOH. Furthermore, it outperforms the reported spinel oxides at high current densities. Our results demonstrated that controlling the facet formation and particle size is essential for the development of efficient electrocatalysts for use in water splitting.

中文翻译：

用于高效电化学水分解的多面和富含缺陷的 CuMn2O4 纳米粒子

晶面工程暴露所需的晶面，是控制水分解中使用的电催化剂的表面吸附和催化反应的有效方法。在此，我们报道了多面 CuMn ₂ O ₄ (f-CMO) 纳米粒子的合成多元醇介导的退火，其中乙二醇在相纯和多面 CMO 的形成中起关键作用。我们发现 f-CMO 具有许多方面、氧空位和高导电性。因此，对其电催化水分解活性进行了研究，以阐明晶面形成的影响。^{值得注意的是，在 -10 mA cm -2} in时，f-CMO 电极表现出比非 f-CMO（239 mV 和 163 mV/dec）更好的析氢反应活性（过电位：116 mV 和 Tafel 斜率：115 mV/dec）。 1 M 氢氧化钾。此外，它在高电流密度下的性能优于已报道的尖晶石氧化物。我们的结果表明，控制晶面形成和粒径对于开发用于水分解的高效电催化剂至关重要。

更新日期：2022-08-03

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