Liu Yue, Hu Yawen, Zhao Xin, Zhu Sheng, Min Yulin, Xu Qunjie, Li Qiaoxia
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200090, China.
ACS Appl Mater Interfaces. 2024 Mar 20;16(11):13795-13805. doi: 10.1021/acsami.3c19548. Epub 2024 Mar 6.
Designing a stable and highly active catalyst for hydrogen evolution and oxygen evolution reactions (HER/OER) is essential for the industrialization of hydrogen energy but remains a major challenge. This work reports a simple approach to fabricating coupled CoP/FeP nanorod array catalyst for overall water decomposition, demonstrating the source of excellent activity in the catalytic process. Under alkaline conditions, CoP/FeP heterostructures exhibit an overpotential of 96 and 220 mV for HER and OER, respectively, at 10 mA cm. For total water splitting, a low voltage of 1.56 V is required to provide a current density of 10 mA cm. And the catalyst exhibits long-term durability for 30 h at a high current density of 250 mA cm. The analysis of the results revealed that the presence of interfacial oxygen vacancies and the strong interaction between CoP/FeP provided the catalyst with more electrochemically active sites and a faster charge transfer capability, which improved the hydrolysis dissociation process. Electrochemically active metal (oxygen) hydroxide phases were produced after OER stability testing. The results of this study prove its great potential in practical industrial electrolysis and provide a reasonable and feasible strategy for the design of nonprecious metal phosphide electrocatalysts.
设计一种用于析氢反应和析氧反应（HER/OER）的稳定且高活性的催化剂对于氢能工业化至关重要，但仍然是一项重大挑战。这项工作报道了一种制备用于全水分解的耦合CoP/FeP纳米棒阵列催化剂的简单方法，揭示了催化过程中优异活性的来源。在碱性条件下，CoP/FeP异质结构在10 mA cm时HER和OER的过电位分别为96和220 mV。对于全水分解，需要1.56 V的低电压来提供10 mA cm的电流密度。并且该催化剂在250 mA cm的高电流密度下表现出30 h的长期耐久性。结果分析表明，界面氧空位的存在以及CoP/FeP之间的强相互作用为催化剂提供了更多的电化学活性位点和更快的电荷转移能力，从而改善了水解离过程。在OER稳定性测试后产生了电化学活性金属（氧）氢氧化物相。本研究结果证明了其在实际工业电解中的巨大潜力，并为非贵金属磷化物电催化剂的设计提供了合理可行的策略。
