期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 2, 页码 1480-1488出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02046
关键词
supercapacitors; electrode; ceramic material La1-xSrxCoO3-delta; commercial level CuO mass loading; high volumetric energy density
资金
- Special Funds of Guangdong Province Public Research and Ability Construction [2014A010106008]
- National Natural Science Foundation of China [9174520, U1601207]
- Research Grants Council of University Grants Committee of Hongkong SAR [152214/17E]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
To evaluate the performance of supercapacitor objectively and accurately, it is critical to develop an electrode with a thickness in the hundred-micrometer range and commercial-level mass loading of active material. In this work, for the first time, high mass loading CuO as active material (10 mg cm(-2)) is supported on La1-xSrxCoO3-delta (LSC, 0 <= x <= 0.8) substrate (thickness: similar to 500 mu m) and used as a cathode for asymmetric supercapacitor. The novel and binder-free CuO/LSC73 (i.e., x = 0.3) electrode shows high areal (C-a, 5.45 F cm(-2)) and specific (C-s, 545 F g(-1)) capacitances. The packaged quasi-solid-state asymmetric supercapacitor with PVA/KOH gel as an electrolyte and carbon cloth as an anode, delivers an ultrahigh volumetric energy density of 4.92 mWh cm(-3) at 10 mA cm(-2) in a wide potential window of 1.4 V, which is comparable to those of lithium batteries (similar to 0.3-10 mWh cm(-3)). In addition, power density of the assembled device can reach 727 mW cm(-3) at 80 mA cm(-2) with a high energy density of 3.03 mWh cm(-3). The remarkable electrochemical performance is attributed to high conductivity of the porous LSC73 substrate and uniform distributions of CuO nanoparticles, which are favorable for the rapid electron transport and effective ions diffusion.
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