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氮掺杂石墨烯负载氮化钴及其电催化水分解性能研究
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Abstract:
析氢反应和析氧反应是电化学水分解和金属–空气电池等可再生能源技术的基础反应。各种过渡金属(Co、Fe、Ni等)基催化剂由于具有良好的电催化活性而被大量探索，以作为贵金属潜在的替代品。本研究成功制备出负载于氮掺杂石墨烯(NGO)上的双功能电催化剂(Co5.47N/NGO)。在1 M KOH中，达到10 mA/cm2的电流密度，OER过电位需352 mV，HER过电位需104 mV。(Co5.47N/NGO)作为电解池的阴极和阳极时，1.79 V的电压就能达到10 mA/cm2的电流密度，并表现出优异的稳定性。该研究简化了氮化钴的合成过程，并且片状NGO减少了纳米粒子的团聚，提供了大量的活性位点，从而提高了电催化活性。
The hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) are fundamental reactions in renewable energy technologies such as electrochemical water splitting and metal-air batteries. A variety of transition metal (Co, Fe, Ni, etc.)—based catalysts have been extensively explored due to their good electrocatalytic activity as potential substitutes for noble metals. In this study, a bifunctional electrocatalyst (Co5.47N/NGO) supported on nitrogen-doped graphene (NGO) was successfully prepared. In 1 M KOH, to reach a current density of 10 mA/cm2, the overpotential for OER is 352 mV and the overpotential for HER is 104 mV. When (Co5.47N/NGO) serves as the cathode and anode of the electrolytic cell, a voltage of 1.79 V can achieve a current density of 10 mA/cm2 and exhibit excellent stability. This research simplifies the synthesis process of cobalt nitride, and the flake-shaped NGO reduces the agglomeration of nanoparticles and provides a large number of active sites, thus improving the electrocatalytic activity.
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