Constructing CoNiRuIrMn high-entropy alloy network for boosting electrocatalytic activity toward alkaline water oxidation

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Su Yan , Linfeng Zhang , Weimo Li , Ruikai Qi , Mengxiao Zhong , Meijiao Xu , Wei Song , Xiaofeng Lu
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Abstract

Anodic oxygen evolution reaction (OER) is crucial for several clean energy storage and conversion processes, like the rechargeable Zn-air battery and electrocatalytic water splitting. However, constructing advanced OER electrocatalysts with exceptional higher activity and stability compared to commercial IrO2 and RuO2 remains a significant challenge. Herein, a high-entropy alloy material consisting of five metal elements (Co, Ni, Ru, Ir, and Mn) with a 3D porous network structure is reported to be fabricated through a facile and mild one-pot co-reduction method, enabling its excellent electron/mass transport property and the modulated d-band center to optimize the intermediates adsorption in electrocatalysis. Therefore, the resultant CoNiRuIrMn sample exhibits the overpotential of merely 169 mV to deliver 10 mA cm−2 in alkaline environment, greatly lower than that of the commercial electrocatalysts (RuO2 and IrO2). Significantly, the CoNiRuIrMn catalyst demonstrates an ultrahigh mass activity of 376.2 A g−1, which is 110.6- and 63.8-fold greater than those of IrO2 and RuO2 catalysts, respectively. Furthermore, the overall water splitting device assembled with CoNiRuIrMn and Pt/C catalyst presents a much better operation voltage and long-term stability than RuO2||Pt/C and IrO2||Pt/C electrolyzers, showcasing its promising potential for efficient hydrogen production.

Abstract Image

Abstract Image

构建CoNiRuIrMn高熵合金网络提高碱性水氧化电催化活性
阳极析氧反应(OER)是几种清洁能源储存和转化过程的关键,如可充电锌空气电池和电催化水分解。然而,与商用IrO2和RuO2相比,构建具有更高活性和稳定性的先进OER电催化剂仍然是一个重大挑战。本文报道了一种由五种金属元素(Co, Ni, Ru, Ir和Mn)组成的具有三维多孔网络结构的高熵合金材料,通过简单温和的一锅共还原方法,使其优异的电子/质量输运性质和调制的d带中心优化了中间体在电催化中的吸附。因此,所得的CoNiRuIrMn样品在碱性环境中表现出仅169 mV的过电位,可提供10 mA cm−2,大大低于商用电催化剂(RuO2和IrO2)。值得注意的是,CoNiRuIrMn催化剂的质量活性为376.2 A g−1,分别是IrO2和RuO2催化剂的110.6倍和63.8倍。此外,与RuO2||Pt/C和IrO2||Pt/C电解槽相比,conirirmn和Pt/C催化剂组合的整体水分解装置具有更好的运行电压和长期稳定性,显示出其在高效制氢方面的巨大潜力。
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来源期刊
Acta Materialia
Acta Materialia 工程技术-材料科学:综合
CiteScore
16.10
自引率
8.50%
发文量
801
审稿时长
53 days
期刊介绍: Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.
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