Wu Xingyue, Qiu Yiping, Yang Baozhu, Li Junyao, Cai Wenrong, Qin Yong, Kong Yong, Yin Zheng-Zhi
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.
J Colloid Interface Sci. 2023 Dec;651:128-137. doi: 10.1016/j.jcis.2023.07.191. Epub 2023 Jul 31.
CoSe/CoP with rich Se- and P-vacancies and heterogeneous interfaces (v-CoSe/CoP) is grown on the surface of nickel foam via a two-step strategy: electrodeposition and NaBH reduction, which can be used as the cathode material in asymmetric supercapacitors. The SEM characterization reveals the honeycomb-like structure of the v-CoSe/CoP, and the results of EPR, XPS and HRTEM reveal the existence of anionic vacancies and heterogeneous interfaces in the v-CoSe/CoP. The as-fabricated v-CoSe/CoP exhibits high specific capacitance (3206 mF cm at 1.0 mA cm) and cyclic stability (91 % capacitance retention after 2000 cycles). An asymmetric supercapacitor is assembled by using the v-CoSe/CoP and activated carbon (AC) as cathode and anode materials, respectively, which displays a high energy density of 40.6 Wh kg at the power density of 211.5 W kg. The outstanding electrochemical performances of the v-CoSe/CoP might be ascribed to the synergistic effects of Se- and P-vacancies and the heterogeneous interfaces in the v-CoSe/CoP.
通过两步法策略（电沉积和硼氢化钠还原）在泡沫镍表面生长出具有丰富硒空位和磷空位以及异质界面的CoSe/CoP（v-CoSe/CoP），其可用作不对称超级电容器的阴极材料。扫描电子显微镜（SEM）表征揭示了v-CoSe/CoP的蜂窝状结构，电子顺磁共振（EPR）、X射线光电子能谱（XPS）和高分辨率透射电子显微镜（HRTEM）的结果揭示了v-CoSe/CoP中阴离子空位和异质界面的存在。所制备的v-CoSe/CoP表现出高比电容（在1.0 mA cm时为3206 mF cm）和循环稳定性（2000次循环后电容保持率为91%）。以v-CoSe/CoP和活性炭（AC）分别作为阴极和阳极材料组装了一个不对称超级电容器，其在功率密度为211.5 W kg时显示出40.6 Wh kg的高能量密度。v-CoSe/CoP出色的电化学性能可能归因于v-CoSe/CoP中硒空位、磷空位和异质界面的协同效应。
