Guo Desheng, Wen Lingling, Wang Tiantian, Li Xin
School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
J Colloid Interface Sci. 2024 Apr;659:707-717. doi: 10.1016/j.jcis.2023.09.173. Epub 2023 Oct 6.
A reasonable design of excellent bifunctional catalyst is an effective strategy for large-scale hydrogen production. In this study, a two-stage electrodeposition method was used to prepare a crystalline-amorphous structure cobalt molybdenum phosphide layered particles with different sizes on a nickel foam (NF) substrate. Electron rearrangement at the Co/CoMoP@CoMoO heterogeneous interface can reduce the reaction energy barrier for HER and OER, and accelerate the catalytic reaction kinetics. The doping of Mo can promote the synergistic effect between Co and Mo, thereby optimizing the Gibbs free energy of hydrogen adsorption/desorption. This layered arrangement of different size particles greatly improves the active area of the catalyst. In alkaline solution, achieving a current density of 10 mA cm only required overpotentials of 40 mV for HER and 278 mV for OER, respectively. The cell voltage required for the CoMo-P/NF||CoMo-P/NF electrolytic cell is only 1.53 V at 10 mA cm. This study provides a reference for the rapid, efficient, and environmentally friendly preparation of high-activity water splitting catalysts with large surface areas.
设计出合理的优异双功能催化剂是大规模制氢的有效策略。在本研究中，采用两步电沉积法在泡沫镍（NF）基底上制备了不同尺寸的晶态-非晶态结构的磷化钴钼层状颗粒。Co/CoMoP@CoMoO异质界面处的电子重排可降低析氢反应（HER）和析氧反应（OER）的反应能垒，并加速催化反应动力学。Mo的掺杂可促进Co和Mo之间的协同效应，从而优化氢吸附/解吸的吉布斯自由能。这种不同尺寸颗粒的层状排列极大地提高了催化剂的活性面积。在碱性溶液中，实现10 mA cm²的电流密度时，HER和OER的过电位分别仅需40 mV和278 mV。CoMo-P/NF||CoMo-P/NF电解池在10 mA cm²时所需的电池电压仅为1.53 V。本研究为快速、高效且环保地制备具有大表面积的高活性析水催化剂提供了参考。
