期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 19, 页码 8981-8988出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta01500c
关键词
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资金
- National Materials Genome Project [2016YFB0700600]
- National Distinguished Young Scientists Program [51425301]
- NSFC [21374021, U1601214]
Metal sulfides (MSs) should be feasible candidates for hybrid electrochemical capacitors (HECs) due to their high theoretical specific capacitances. However, their performances are largely hampered by sluggish ion/electron transport kinetics and fast capacitance fading. Here, we provide a new approach to fabricate high-performance dual-structural MSs for long-life electrochemical energy storage devices. With robust, graphitic and nitrogen-doped porous carbon shells and highly conductive reduced graphene oxide (RGO) substrates, our cobalt sulfide-based composite shows 99.7% capacitance retention after 4000 cycles. We also present a sandwich-like carbon electrode with ultrahigh specific capacitance and excellent cycling stability. As a result, a quasi-solid-state HEC comprising the above-mentioned electrodes and a PVA-PAA membrane is fabricated. Its electrochemical performance is superior to those formerly reported for MSs, and our results for the first time provide a solid base for the application of MSs in HECs.
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