Electrocatalytic activity of α-MoB2 porous self-supported electrodes for the HER: The effects of sintering temperature

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-07-30 DOI:10.1111/jace.70139

Yangwei Zhang, Jun Cao, Shixuan Wang, Ying Long, Rongxia Huang, Hua-Tay Lin

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Abstract

α-MoB₂, which has been considered as one of the promising nonprecious transition metal borides catalysts for the hydrogen evolution reaction (HER), has recently been reported to be very efficient in the bulk form (self-supported electrode). However, bulk α-MoB₂ is normally synthesized under high-temperature and high-pressure conditions. In the present work, α-MoB₂ porous self-supported electrodes with relative density of ∼52%–55% were synthesized by a combination of mechano-chemical process and low-temperature (750°C, 800°C, 850°C, and 900°C) spark plasma sintering technique. The effects of the sintering temperature on HER activity of the self-supported electrodes in acidic solution were investigated in this study. The results showed that an overpotential as low as 91.2 mV at a current density of 10 mA/cm², and a Tafel slope of 61.8 mV/dec were obtained by the α-MoB₂ electrode prepared at 850°C. This is the lowest overpotential value of the pure α-MoB₂ at a current density of 10 mA/cm² ever reported in the open literature. Thus, the present study provides a new insight into the potentially innovative approach to manufacture α-MoB₂ porous self-supported electrodes with excellent HER performance.

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α-MoB2多孔自支撑电极对HER的电催化活性：烧结温度的影响

α-MoB2被认为是一种很有前途的用于析氢反应（HER）的非贵重过渡金属硼化物催化剂，最近有报道称其在体积形式（自支撑电极）下具有很高的效率。而体α-MoB2通常是在高温高压条件下合成的。本文采用机械化学工艺和低温（750°C、800°C、850°C和900°C）火花等离子烧结技术相结合的方法合成了相对密度为~ 52% ~ 55%的α-MoB2多孔自支撑电极。研究了在酸性溶液中烧结温度对自支撑电极HER活性的影响。结果表明，在850℃条件下制备的α-MoB2电极在电流密度为10 mA/cm2时的过电位低至91.2 mV， Tafel斜率为61.8 mV/dec。这是公开文献报道的纯α-MoB2在电流密度为10 mA/cm2时的最低过电位值。因此，本研究为制造具有优异HER性能的α-MoB2多孔自支撑电极的潜在创新方法提供了新的见解。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.