High-Performance Transition Metal Phosphide Alloy Catalyst for Oxygen Evolution Reaction
High-Performance Transition Metal Phosphide Alloy Catalyst for Oxygen Evolution Reaction
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DOI：
10.1021/acsnano.7b04646
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发表时间：
2018-01-01
期刊：
影响因子：
17.1
通讯作者：
Zhu, Yu
中科院分区：
文献类型：
--
作者：
Liu, Kewei;Zhang, Changlin;Zhu, Yu
析氧反应（OER）是许多能量转换和储存技术中的关键过程，如水裂解、可再生燃料电池和可充电金属-空气电池。合成稳定、高效、非贵金属基的OER电催化剂一直是一个长期的挑战。在这项工作中，一个简单的和可扩展的方法来合成中空和导电的磷化铁钴（Fe-Co-P）合金纳米结构使用的Fe-Co金属有机配合物作为前体。Fe-Co-P合金具有优异的OER活性，在低至252 mV的过电位下，比电流密度达到10 mA/cm（2）。Fe-Co-P催化剂在1.5V（相对于可逆氢电极）下的电流密度为30.7mA/cm（2），这比用现有技术的Fe-Co氧化物催化剂获得的电流密度大3个数量级以上。我们的机理实验和理论分析表明，电化学诱导的高价铁稳定在低价态的钴，导致同时提高活性和稳定性的OER催化剂。
Oxygen evolution reaction (OER) is a pivotal process in many energy conversion and storage techniques, such as water splitting, regenerative fuel cells, and rechargeable metal-air batteries. The synthesis of stable, efficient, non-noble metal-based electrocatalysts for OER has been a long-standing challenge. In this work, a facile and scalable method to synthesize hollow and conductive iron-cobalt phosphide (Fe-Co-P) alloy nanostructures using an Fe-Co metal organic complex as a precursor is described. The Fe-Co-P alloy exhibits excellent OER activity with a specific current density of 10 mA/cm(2) being achieved at an overpotential as low as 252 mV. The current density at 1.5 V (vs reversible hydrogen electrode) of the Fe-Co-P catalyst is 30.7 mA/cm(2), which is more than 3 orders of magnitude greater than that obtained with state-of-the-art Fe-Co oxide catalysts. Our mechanistic experiments and theoretical analysis suggest that the electrochemical-induced high-valent iron stabilizes the cobalt in a low-valent state, leading to the simultaneous enhancement of activity and stability of the OER catalyst.