Cao Mengya, Li Yanrong, Cao Yijia, Wen Yusong, Li Bao, Shen Qing, Gu Wen
Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, China.
Inorg Chem. 2024 Jul 29;63(30):14062-14073. doi: 10.1021/acs.inorgchem.4c01863. Epub 2024 Jul 16.
The development of efficient and Earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is an urgent requirement in the field of electrochemical water splitting. The electrocatalytic performance of the OER can be greatly enhanced by the synergistic combination of zeolite imidazolate frameworks (ZIFs) and transition-metal phosphides, both of which individually exhibit promising capabilities in this regard. In this study, a novel amorphous NiCoP deposited on ZIF-67 sheets supported on Ni foam (labeled as NiCoP/ZIF-67/NF) as an OER electrocatalytic material was successfully synthesized using a simple, secure, and time-efficient two-step strategy. The experimental results demonstrate that NiCoP/ZIF-67/NF possesses a large active surface area with abundant active sites. Also, the synergistic effect and interaction between NiCoP and ZIF-67, as well as between Ni and Co within NiCoP, effectively enhance its electrochemical performance under alkaline conditions. Consequently, NiCoP/ZIF-67/NF exhibits outstanding catalytic activity for OER with an overpotential (η) of 175 mV at a current density of 10 mA cm and a long-term stability over 40 h at 20 mA cm in a 1.0 M KOH electrolyte. The corresponding analyses suggest that the real active sites responsible for the OER are identified as NiOOH and CoOOH species within the structure of NiCoP/ZIF-67/NF. Additionally, the catalytic function and stability of ZIF-67 toward the OER under alkaline conditions were also briefly discussed. This work provides a novel catalytic material for the OER along with a facile strategy to fabricate superior, efficient, and noble metal-free catalysts suitable for energy-related applications.
开发用于析氧反应（OER）的高效且地球上储量丰富的电催化剂是电化学水分解领域的迫切需求。通过将沸石咪唑酯骨架（ZIFs）与过渡金属磷化物协同结合，可以大大提高OER的电催化性能，这两者在这方面各自都展现出了有前景的能力。在本研究中，采用一种简单、安全且省时的两步策略，成功合成了一种新型的非晶态NiCoP，其沉积在泡沫镍支撑的ZIF-67片上（标记为NiCoP/ZIF-67/NF）作为OER电催化材料。实验结果表明，NiCoP/ZIF-67/NF具有大的活性表面积和丰富的活性位点。此外，NiCoP与ZIF-67之间以及NiCoP中Ni和Co之间的协同效应和相互作用，有效地增强了其在碱性条件下的电化学性能。因此，NiCoP/ZIF-67/NF在1.0 M KOH电解液中，在电流密度为10 mA cm时过电位（η）为175 mV，对OER表现出优异的催化活性，并且在20 mA cm下具有超过40 h的长期稳定性。相应的分析表明，负责OER的实际活性位点被确定为NiCoP/ZIF-67/NF结构中的NiOOH和CoOOH物种。此外，还简要讨论了ZIF-67在碱性条件下对OER的催化作用和稳定性。这项工作为OER提供了一种新型催化材料，并提供了一种简便的策略来制备适用于能源相关应用的优质、高效且无贵金属的催化剂。
