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优化中间体的吸附性,并揭示了Co6Fe3S8固体溶液的动态重建,用于双功能水分裂

Yuanhua Xiao¹, Shiwei Zhang¹, Ya Shen¹

¹Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China.

Journal of colloid and interface science

|March 13, 2024

概括

这项研究通过结合铁兴奋剂和硫空缺来增强硫化水分裂的催化剂. 新的催化剂在氧化演化和化演化反应方面表现出色,使得水的电解效率高.

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:

硫化物 (Co9S8) 是水电解的有希望的催化剂.
铁兴奋剂改善了氧进化反应 (OER),但Co9S8在性介质中进化反应 (HER) 性能差.
对于高效的水分解,需要双功能催化剂.

研究的目的:

为了协同增强Co9S8.8的双功能分水性能.
为OER和HER开发一种高效的电催化剂.
为了探索铁和硫空缺工程的联合效应.

主要方法:

用硫空缺 (Co6Fe3S8) 合成添加的 Co9S8.
对OER和HER性能进行电化学表征 (超电位,Tafel斜率).
在/外现场实验和密度函数理论 (DFT) 模拟.

主要成果:

Co6Fe3S8 呈现低超电位 (250 mV 的 OER, 84 mV 的 HER) 和 Tafel 斜率 (135 mV 的 OER, 114 mV 的 HER).
一个两电极电池在1.48V时实现了10mA cm-2的高稳定性 (100小时).
电化学重构形成了OER的CoOOH/FeOOH活性物种;DFT显示了对HER的增强H2O和H*吸附.

结论:

铁和硫空缺工程协同促进双功能的水分裂.
Co6Fe3S8催化剂表现出极好的催化活性和稳定性.
这项工作为设计用于水电解的先进电催化剂提供了策略.

关键词:

其他 () (9) 其他 () 8)费尔多芬使用兴奋剂总体而言,水分化是水分化的.S 的职位空缺.

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