磷化钴/碳点复合材料作为析氧反应的高效电催化剂。
Cobalt phosphide/carbon dots composite as an efficient electrocatalyst for oxygen evolution reaction.
作者信息
Zhu Mengmeng, Zhou Yunjie, Sun Yue, Zhu Cheng, Hu Lulu, Gao Jin, Huang Hui, Liu Yang, Kang Zhenhui
机构信息
Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, PR China.
出版信息
Dalton Trans. 2018 Apr 17;47(15):5459-5464. doi: 10.1039/c7dt04291d.
The oxygen evolution reaction (OER) is a promising energy conversion system, which has been studied a lot in recent years. However, owing to the high overpotential and sluggish kinetics of the OER, an efficient electrocatalyst is necessary to lower the overpotential and accelerate the reaction. In this paper, we report a cobalt phosphide (CoP)/carbon dots (CDs) composite as an electrocatalyst for the OER for the first time. A facile two-step method was used to synthesize the CoP/CDs composite and the concentration of CDs in the composite was further regulated. The experimental results show that when the amount of CDs in the composite is 6 mg (28.79 wt%C), the obtained CoP/CDs composite exhibits optimal electrocatalytic activity (with an overpotential of 400 mV in 1 M KOH at a current density of 10 mA cm-2) and high stability towards the OER. The good electrocatalytic activity of the composite is attributed to the small size of CoP and CDs and rapid electron transfer of CDs.
析氧反应（OER）是一种很有前景的能量转换系统，近年来已得到大量研究。然而，由于OER的高过电位和缓慢的动力学，需要一种高效的电催化剂来降低过电位并加速反应。在本文中，我们首次报道了磷化钴（CoP）/碳点（CDs）复合材料作为OER的电催化剂。采用一种简便的两步法合成CoP/CDs复合材料，并进一步调节复合材料中CDs的浓度。实验结果表明，当复合材料中CDs的量为6 mg（28.79 wt%C）时，所制备的CoP/CDs复合材料表现出最佳的电催化活性（在1 M KOH中，电流密度为10 mA cm-2时过电位为400 mV）以及对OER的高稳定性。该复合材料良好的电催化活性归因于CoP和CDs的小尺寸以及CDs的快速电子转移。
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