期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 4, 页码 1767-1778出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta12532a
关键词
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资金
- China Postdoctoral Science Foundation [2019TQ0353]
- National Natural Science Foundation of China [51672055, 51972342, 51902345, 51872656]
- Fundamental Research Funds for the Central Universities [19CX05001A]
- Taishan Scholar Project of Shandong Province [ts20190922]
- Key Basic Research Projects of Natural Science Foundation of Shandong Province [ZR2019ZD51]
Traditional positive electrode materials consisting of transition metal oxides, sulfides, hydroxides, and conductive polymers exhibit ultra-high capacitances for asymmetric supercapacitors. However, negative electrode materials are rather poor. Herein, we report a simple but efficient template carbonization method to covalently graft p-phenylenediamine molecules onto a hollow bubble-like carbon sphere (PPD-BC) surface as the negative electrode for high performance asymmetric supercapacitors. In this strategy, the bubble-like carbon spheres can not only act as reservoirs to physically store pseudocapacitance additive p-phenylenediamine (PPD) molecules through a spatially constrained behavior, but also chemically confine the PPD using CO-NH chemically covalent bonds. As a result, the specific capacitance of PPD-BC (451 F g(-1)) is about three times higher than that of hollow bubble carbon (166 F g(-1)) due to the extra addition of faradaic reactions. More importantly, the as-assembled PPD-BC//Ni(OH)(2) asymmetric supercapacitor exhibits a remarkably high energy density of 94 W h kg(-1) at a power density of 423 W kg(-1), as well as outstanding cycling performance with 88% capacitance retention after 1000 cycles. Therefore, the design of organic molecule modified carbon materials holds great promise for ultrahigh energy density storage devices.
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