Co-CoO/ZnFe2O4 encapsulated in carbon nanowires derived from MOFs as electrocatalysts for hydrogen evolution
作者：Liu, WQ (Liu, Wenqi) [1] ; Zhou, YM (Zhou, Yuming) [1] , [2] ; Bao, JH (Bao, Jiehua) [1] ; Wang, JQ
關(guān)鍵字：NanowiresCo-CoO/ZnFe2O4Carbon materialCo/Zn/Fe-MOFHydrogen evolution reaction
論文來源：期刊
發(fā)表時間：2020年
Transition metals are increasingly attracting interest in electrocatalysts for use in water decomposition due to their excellent catalytic activity and stability. Simultaneously, metal-organic frameworks with designable metal ion centers and organic ligands are the promising precursors for the one-step synthesis of metal encapsulated in carbon composites for alkaline hydrogen evolution reaction (HER). Herein, we report the successful construction of Co-CoO/ZnFe2O4 encapsulated in carbon nanowires (Co-CoO/ZnFe2O4@CNWs) by annealing as-synthesized nanowire Co/Zn/Fe-MOF at 400 degrees C in N-2. This structure provides the rich defect sites and active centers, and the synergy of Co, CoO and ZnFe2O4 lead to efficient hydrogen evolution when the composite is used as a catalytic electrode for HER in 1.0 M KOH. The catalyst shows a low initial overpotential (97 mV) and a small Tafel slope (138 mV dec(-1)), and the overpotential at 10 mA cm(-2) is only 226 mV. In addition, this composite material exhibits excellent long-term durability even after 1000 cycles. It is expected that it is a potential alternative catalyst for rational utilization in the field of electrolytic water decomposition. (C) 2019 Elsevier Inc. All rights reserved.