超级电容器
材料科学
电容
电极
异质结
电化学
功率密度
纳米技术
X射线光电子能谱
电容器
水平扫描速率
光电子学
循环伏安法
化学工程
电压
复合材料
电气工程
化学
功率(物理)
工程类
物理化学
物理
量子力学
作者
Jing Wang,Feng Zheng,Mingjun Li,Jiao Wang,Donghua Jia,Wei Wang,Pengfei Hu,Qiang Zhen,Yi Yu
标识
DOI:10.1016/j.cej.2022.136922
摘要
V2O5 nanobelt arrays (VNBs) are directly synthesized on porous nickel as the primary structure, and then the VNBs are completely covered by RuO2 nanosheets (RNSs) as the secondary structure to create a core–shell heterojunction. The as-prepared [email protected] core–shell heterojunction is systematically researched through SEM, EDS, XRD, XPS and TEM, and the growth process is investigated in detail by sampling at different time. The [email protected] has a superb specific capacitive value of 971F g−1 at a voltage scanning speed of 5 mV s−1, a better cyclic steadiness of 80.4 % after recycling 10,000 times, a small charge transferring resistance value of 1.8 Ω and a fast effective diffusion coefficient of 1.01 × 10−8 cm2 s−1 calculated by CV, GCD, AC impedance and CA electrochemical techniques in a three-electrode testing system. A symmetrical electrochemical capacitor assembled by the as-prepared [email protected] electrode material has a superior energy density of 174.2 W h kg−1 at a power density of 450 W kg−1 and still retains 95.9 W h kg−1 at 9000 W kg−1 in a two-electrode testing system. The improved supercapacitive performance makes the [email protected] as a superior electrode material for supercapacitor.
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