普鲁士蓝
超级电容器
电极
材料科学
电解质
电容
化学工程
镍
纳米技术
化学
电化学
冶金
工程类
物理化学
作者
Lin Zhang,Peipei Jia,Zhirong Guo,Qiaoling Cai,Zhaohui Li,Xun Zhu,Rong‐Bin Song,Hong‐Chang Yao,Zhongjun Li
标识
DOI:10.1016/j.jcis.2023.05.036
摘要
The exploitation of high-performance electrode materials is significant to develop supercapacitors with satisfied energy and power output properties. In this study, a g-C3N4/Prussian-blue analogue (PBA)/Nickel foam (NF) with hierarchical micro/nano structures was developed by a simple salts-directed self-assembly approach. In this synthetic strategy, NF acted as both 3D macroporous conductive substrate and Ni source for PBA formation. Moreover, the incidental salt in molten salt-synthesized g-C3N4 nanosheets could regulate the combination mode between g-C3N4 and PBA to generate interactive networks of g-C3N4 nanosheets-covered PBA nano-protuberances on NF surfaces, which further expended the electrode/electrolyte interfaces. Based on the merits from this unique hierarchical structure and the synergy effect of PBA and g-C3N4, the optimized g-C3N4/PBA/NF electrode exhibited a maximum areal capacitance of 3366 mF cm−2 at current of 2 mA cm−2, as well as 2118 mF cm−2 even under large current of 20 mA cm−2. The solid-state asymmetric supercapacitor using g-C3N4/PBA/NF electrode possessed an extended working potential window of 1.8 V, prominent energy density of 0.195 mWh cm−2 and power density of 27.06 mW cm−2. Compared to the device with pure NiFe-PBA electrode, a better cyclic stability with capacitance retention rate of 80% after 5000 cycles was also achieved due to the protective effect of g-C3N4 shells on the etching of PBA nano-protuberances in electrolyte. This work not only builds a promising electrode material for supercapacitors, but also provide an effective way to apply molten salt-synthesized g-C3N4 nanosheet without purification.
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