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自支持的α-MoB/β-MoB陶电极,用于在酸性,中性和性pH值下高效的高电流密度进化

Sishi Huang¹, Anding Huang¹, Haisen Huang¹

¹CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

ACS applied materials & interfaces

|January 28, 2025

概括

新的自支氧化陶电极在所有pH水平上都显示出出色的进化反应性能. 这些电极非常适合工业电催化水分裂,提供高效率和稳定性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

工业电催化水分解需要高效和稳定的演化反应 (HER) 催化剂.
开发能够在整个pH范围 (酸性,中性和性) 进行有效的催化剂对于实际应用至关重要.

研究的目的:

为了生产和评估自支的α-MoB/β-MoB2陶电极用于高电流密度的HER.
为了研究这些电极在酸性,中性和性介质中的HER性能.
了解α-MoB/β-MoB₂异质连接在增强催化活性中的作用.

主要方法:

磁带造和相位逆转过程,随后进行烧结以合成自支的β-MoB电极.
在现场形成α-MoB/β-MoB₂异质连接通过与MoO₃的反应.
电化学测试用于测量超电位和高电流密度下的稳定性.
密度函数理论 (DFT) 计算用于分析电子结构和反应机制.

主要成果:

合成的电极表现出一个多孔结构,促进了电解质的获取和气体释放.
α-MoB/β-MoB₂异质连接显著提高了电催化性能.
在1000 mA·cm^-2 (289 mV在酸中,294 mV在中) 和稳定的运行 (>100 h) 中达到较低的超电位.
在中性溶液中表现出良好的性能 (354mV在100mA·cm-2).

结论:

自支持的α-MoB/β-MoB2陶电极由于其高的HER活性和在所有pH值上的稳定性,显示出对工业电催化水分裂的有希望的潜力.
异质连接结构增强了电子转移,并促进了吸附/水解离,这对于高效的水分裂至关重要.

关键词:

高电流密度的高电流密度.气演化反应反应的反应自助式电极自助式电极整个pH值范围.α-MoB/β-MoB2 异构结构的异构结构

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