近日，湖北大学王浩团队实现了磷酸钴铁异质合金作为可充电锌空气电池析氧电催化剂的构建与结构演化。2025年8月12日出版的《结构化学》杂志发表了这项成果。

解决析氧反应（OER）的动力学限制对于推进可充电锌空气电池的发展至关重要，因此推动有效且价格合理的电催化剂的开发迫在眉睫。研究组通过水浴法和水热法两步法构建了钴铁合金磷酸盐（CoFe/Co-Fe-PO）作为OER催化剂的界面结构，该结构在碱性介质中表现出显著的OER活性，需要271 mV的低过电位才能达到10 mA cm^-2，并表现出65 mV dec^-1的竞争性塔菲尔斜率，同时保持了操作稳定性。这种性能的增强可归因于CoFe合金的参与提高了电导率，并通过部分磷酸化增加了活性位点的数量，从而协同增强了电荷转移过程并加速了OER动力学。

此外，研究组深入探讨了OER过程中的动态结构演变，结果表明，合金@磷酸盐逐渐演变为磷酸盐自由基修饰的Co-Fe羟基氧化物，作为实际的活性相。将所制备的催化剂集成到锌空气电池中，显著提高了电池性能，从而为下一代OER电催化剂的开发提供了新的战略方向。

附：英文原文

Title: Construction and structural evolution of heterostructured cobalt-iron alloys@ phosphates as oxygen evolution electrocatalyst toward rechargeable Zn-air battery

Author: anonymous

Issue&Volume: 2025-08-12

Abstract: Addressing the kinetic limitations of the oxygen evolution reaction (OER) is paramount for advancing rechargeable Zn-air batteries, thus it is extremely urgent to drive the development of effective and affordable electrocatalysts. This work constructed the interfacial structure of cobalt-iron alloys@ phosphates (denoted as CoFe/Co-Fe-PO) as OER catalyst through a two-step approach using water-bath and hydrothermal methods, which demonstrated significant OER activity in alkaline media, requiring a low overpotential of 271 mV to achieve 10 mA cm-2 and exhibiting a competitive Tafel slope of 65 mV dec-1, alongside sustained operational stability. The enhanced performance can be attributed to the improved electrical conductivity due to the participation of CoFe alloys and the an increased number of active sites through partial phosphorylation, which synergistically enhance charge transfer processes and accelerate OER kinetics. Moreover, dynamic structural evolution during OER process was thoroughly probed, and the results showed that alloys@ phosphates gradually evolved into phosphate radical-modified Co-Fe hydroxyoxides that act as the actual active phase. Highlighting its practical applicability, the integration of the prepared catalyst into zinc-air batteries led to markedly improved performance, thereby offering promising new strategic directions for the development of next-generation OER electrocatalysts.

DOI: 10.1016/j.cjsc.2025.100699

Source: http://cjsc.ac.cn/cms/issues/854