Ou Weihua, Li Ligui, Zhou Wei, Chen Minzhe, Zhu Chuheng, Zhu Xiaoyan, Yuan Ke
New Energy Research Institute, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Materials (Basel). 2024 Sep 22;17(18):4647. doi: 10.3390/ma17184647.
Defect engineering, by adjusting the surface charge and active sites of CoP catalysts, significantly enhances the efficiency of the oxygen evolution reaction (OER). We have developed a new CoP catalyst that has both cobalt defects and phosphorus vacancies, demonstrating excellent OER performance. Under both basic and acidic media, the catalyst incurs a modest overvoltage, with 238 mV and 249 mV needed, respectively, to attain a current density of 10 mA cm. In the practical test of alkaline electrocatalytic water splitting (EWS), the CoP || Pt/C EWS shows a low cell voltage of 1.51 V and superior performance compared to the noble metal-based EWS (RuO || Pt/C, 1.66 V). This catalyst's exceptional catalytic efficiency and longevity are mainly attributed to its tunable electronic structure. The presence of cobalt defects facilitates the transformation of Co to Co, while phosphorus vacancies enhance the interaction with oxygen species (*OH, *O, *OOH), working in concert to improve the OER efficiency. This strategy offers a new approach to designing transition metal phosphide catalysts with coexisting metal defects and phosphorus vacancies, which is crucial for improving energy conversion efficiency and catalyst performance.
通过调整CoP催化剂的表面电荷和活性位点进行缺陷工程，可显著提高析氧反应（OER）的效率。我们开发了一种同时具有钴缺陷和磷空位的新型CoP催化剂，其展现出优异的OER性能。在碱性和酸性介质中，该催化剂的过电位适中，达到10 mA cm的电流密度分别需要238 mV和249 mV。在碱性电催化水分解（EWS）的实际测试中，CoP || Pt/C EWS显示出1.51 V的低电池电压，与基于贵金属的EWS（RuO || Pt/C，1.66 V）相比具有更优异的性能。这种催化剂卓越的催化效率和寿命主要归因于其可调节的电子结构。钴缺陷的存在促进了Co向Co的转变，而磷空位增强了与氧物种（*OH、*O、*OOH）的相互作用，协同提高了OER效率。该策略为设计具有共存金属缺陷和磷空位的过渡金属磷化物催化剂提供了一种新方法，这对于提高能量转换效率和催化剂性能至关重要。
