黄康, 朱梅婷, 张飞鹏, 许志龙, 王洪涛, 肖葵, 吴俊升. 一种高效双功能电催化剂CoP/Co@NPC@rGO的制备[J]. 工程科学学报, 2020, 42(1): 91-98. DOI: 10.13374/j.issn2095-9389.2019.07.26.002
引用本文: 黄康, 朱梅婷, 张飞鹏, 许志龙, 王洪涛, 肖葵, 吴俊升. 一种高效双功能电催化剂CoP/Co@NPC@rGO的制备[J]. 工程科学学报, 2020, 42(1): 91-98. DOI: 10.13374/j.issn2095-9389.2019.07.26.002
HUANG Kang, ZHU Mei-ting, ZHANG Fei-peng, XU Zhi-long, WANG Hong-tao, XIAO Kui, WU Jun-sheng. Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction[J]. Chinese Journal of Engineering, 2020, 42(1): 91-98. DOI: 10.13374/j.issn2095-9389.2019.07.26.002
Citation: HUANG Kang, ZHU Mei-ting, ZHANG Fei-peng, XU Zhi-long, WANG Hong-tao, XIAO Kui, WU Jun-sheng. Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction[J]. Chinese Journal of Engineering, 2020, 42(1): 91-98. DOI: 10.13374/j.issn2095-9389.2019.07.26.002

一种高效双功能电催化剂CoP/Co@NPC@rGO的制备

Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction

  • 摘要: 简单的热处理和热处理磷化ZIF-67/氧化石墨烯(GO)前驱体得到具有典型的多孔碳结构特征的CoP/Co@NPC@rGO纳米复合材料电催化剂。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、拉曼光谱(Raman)和N2等温吸脱附曲线等对其形貌、成分和结构进行分析和表征。采用线性扫描伏安法、电化学阻抗谱和计时电位法探讨了CoP/Co@NPC@rGO纳米复合电催化剂对氢气析出反应(HER)和氧气析出反应(OER)的电催化活性和稳定性。结果表明,CoP/Co@NPC@rGO‒350在1.0 mol·L–1 KOH溶液中达到10 mA·cm‒2电流密度的析氢过电位仅127 mV;同时,在1.0 mol·L–1 KOH溶液中显示出优于贵金属RuO2的析氧性能,达到10 mA·cm‒2电流密度的过电位为276 mV,塔菲尔斜率仅为42 mV·dec‒1。这种高析氢和析氧电催化活性主要归因于高度石墨化的N掺杂多孔碳与N掺杂石墨烯之间的协同效应。CoP/Co@NPC@rGO是电催化全解水电催化剂的候选材料,且为基于金属有机骨架(MOFs)/氧化石墨烯复合材料的高效电催化剂的设计开辟了一条新的途径。

     

    Abstract: The construction of the highly active transition-metal phosphide/carbon-based electrocatalyst from metal-organic frameworks (MOFs) precursors is considered as an efficient approach. In this work, ZIF-67/GO precursors were firstly obtained by the in situ controllable growth of ZIF-67 nanocrystals on both surfaces of GO sheets. Then, a highly efficient bifunctional electrocatalyst CoP/Co@NPC@rGO nanocomposite was derived by the thermal pyrolysis of ZIF-67/GO precursors under N2 atmosphere and a subsequent phosphatization process. The structure and elemental composition of the ZIF-67/GO, Co@NPC@rGO, and CoP/Co@NPC@rGO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N2 ad-/desorption isotherms analysis. The Co@NPC@rGO‒800 nanocomposite exhibits a high Brunauer-Emmett-Teller (BET) surface area of 186.27 m2·g‒1, indicating that both micropores and mesopores existed. Subsequently, the electrocatalytic properties of the CoP/Co@NPC@rGO nanocomposites for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) were investigated by electrochemical measurements. The results suggest that the obtained CoP/Co@NPC@rGO‒350 nanocomposite only requires an overpotential of 127 mV to reach a current density of 10 mA·cm‒2 for HER in 1.0 mol·L–1 KOH solution. For OER, CoP/Co@NPC@rGO‒350 nanocomposite can reach a current density of 10 mA·cm‒2 at an overpotential of 276 mV, with a Tafel slope of 42 mV·dec−1, in the same alkaline aqueous solution, which is superior to RuO2. In addition, for both HER and OER, CoP/Co@NPC@rGO‒350 nanocomposite also shows impressive strong durability in alkaline aqueous solution. The outstanding performance can be attributed to the synergistic effect of coupled highly graphitized N-doped porous carbon and N-doped graphene. The as-prepared CoP/Co@NPC@rGO‒350 electrocatalyst is a promising candidate for overall water splitting in the alkaline solution. This development offers an attractive catalyst material based on MOF/GO composites. It is expected that the presented strategy can be extended to the fabrication of other composites electrode materials for more efficient water splitting.

     

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