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缺电子的Co₇Fe₃是由碳化的界面作用引起的,促进氧的进化反应

Weixiong Huang¹, Haiyan Ma¹, Jiaou Qi¹

¹The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.

Journal of colloid and interface science

|May 5, 2024

概括

一种新型的异构结构催化剂,Co7Fe3/Mo2C@C,显著降低了水分裂中氧演化反应 (OER) 的过度潜力. 这种发展为高效的气生产提供了低成本,高活动的替代方案.

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:

通过水分的高效气生产需要催化剂,以最大限度地减少阳极过量的潜力.
为氧化演化反应 (OER) 开发具有成本效益和高活性的催化剂至关重要.

研究的目的:

为高效的OER合成和表征一个异构的Co7Fe3/Mo2C@C催化剂.
研究催化活性并了解开发的催化剂的机制.

主要方法:

合成具有异构结构的Co7Fe3/Mo2C@C催化剂.
在电流密度为10mA/cm2的电化学测试中测量OER超电位.
机械学研究和密度函数理论 (DFT) 计算.

主要成果:

Co7Fe3/Mo2C@C催化剂的OER超电位 (10) 为254mV,明显低于Co7Fe3@C (308mV) 和Mo2C@C (439mV).
催化活动与商业RuO2.2相当.
由于Mo2C,DFT的计算揭示了Co7Fe3中的电子缺陷,产生活性位点并降低反应能量障碍.

结论:

异构结构的Co7Fe3/Mo2C@C催化剂显示出卓越的OER性能.
在Co7Fe3/Mo2C接口的电子转移是增强催化活性的关键.
这种催化剂提供了一个有前途的低成本解决方案,通过水分裂生产气.

关键词:

电化学减少氧的方法缺乏电子的可 (7) 铁 (3)界面上的C07) Fe03) -Mo02) C效应碳化物是一种碳化物.

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