| 一种高效双功能电催化剂CoP/Co@NPC@rGO的制备 |
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| 作者姓名： | 黄康 朱梅婷 张飞鹏 许志龙 王洪涛 肖葵 吴俊升 |
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| 作者单位： | 1.北京科技大学新材料技术研究院，北京 100083 |
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| 基金项目： | 国家自然科学基金资助项目（51771027）；国家重点研发计划资助项目（2017YFB0702100） |
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| 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。
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| 关 键 词： | 氧化石墨烯 电催化 氢气析出反应 氧气析出反应 ZIF-67 |
| 收稿时间： | 2019-07-26 |
Preparation of CoP/Co@NPC@rGO nanocomposites with an efficient bifunctional electrocatalyst for hydrogen evolution and oxygen evolution reaction |
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| Affiliation: | 1.Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China2.Department of Materials Science and Engineering, Tianjin College, University of Science and Technology Beijing, Tianjin 301830, China |
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| 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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