通过同质氧化反应识别NiFe氧氧化物氧化催化剂的表面氧介质
Yaming Hao1, Yefei Li2, Jianxiang Wu1
1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, P. R. China.
Journal of the American Chemical Society
|January 13, 2021
概括
研究人员在-铁氧化催化剂上确定了关键的氧中间体. 氧原子转移探测器揭示了休息的FeO中间体和限制速度的O-O合步骤,指导催化剂设计以提高能源效率.
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 铁氧化是可再生生产中的氧化演化反应 (OER) 的主要催化剂.
- 了解这种催化剂的氧介质和反应途径对于提高能源效率至关重要.
研究的目的:
- 识别和描述氧介质和OER在NiFe氧化中的反应途径.
- 研究特定中间体在催化过程中的作用,并指导催化剂设计.
主要方法:
- 使用现场反应探针,包括氧原子转移 (OAT) 探针,以选择性地准和研究OER中间体.
- 使用电化学运动测量和操作拉曼光谱.
- 执行密度函数理论 (DFT) 的计算.
主要成果:
- OAT探针显著抑制了OER动力学,表明它们与关键中间体的反应性.
- 确定了一个静止的FeO中间体和一个涉及桥梁氧的O-O化学合步骤.
- DFT的计算证实了O-O合步骤的较长FeO键和高动力障碍.
结论:
- 该研究阐明了NiFe氧化的OER机制,强调了FeO中间体和O-O合步骤的意义.
- 通过专注于释放晶格氧和加速O-O合来建议催化剂优化策略.
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