钒
电解质
超级电容器
密度泛函理论
材料科学
炭黑
纳米技术
化学工程
工程类
化学
冶金
电化学
计算化学
电极
物理化学
复合材料
天然橡胶
作者
Aditya Sharma,Samadhan Kapse,Ankur Verma,Sagar Bisoyi,Gopal K. Pradhan,Ranjit Thapa,Chandra Sekhar Rout
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-08-12
卷期号:5 (8): 10315-10327
被引量:17
标识
DOI:10.1021/acsaem.2c02116
摘要
Vanadium disulfide–black phosphorus (VS2–BP) hybrids were synthesized by a one-pot hydrothermal-assisted method to achieve enhanced electrochemical activity for supercapacitor applications. The concentration of BP was optimized to prevent the restacking nature of VS2 and to enrich the active edges for electrolytic ion intercalation. The charge storage kinetics of the best-performing VS2–BP as an active electrode has demonstrated the dominance of the pseudocapacitive nature of the material. Furthermore, by sandwiching with a PVA/K2SO4 gel electrolyte, an all-solid-state (ASS) vanadium disulfide–black phosphorus-50 mg (VS2–BP-50) symmetric device was developed on highly conductive carbon paper. The ASS VS2–BP-50 symmetric device displays the highest specific areal capacitance of 203.25 mF/cm2 and exhibits the maximum areal energy density of 28.22 μW h cm–2 at an areal power density of 596.09 mW cm–2, outperforming the previous literature. To understand the origin of the high quantum capacitance, we used density functional theory (DFT) and found that the charge accumulation region between VS2 and BP monolayers and the charge transfer are the origin of the improved density of states in the VS2–BP hybrid. Moreover, exceptional mobility of K+ ions and a higher diffusion rate were observed using the DFT method.
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