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论文类型：期刊论文

发表时间：2018-06-28

发表刊物：DALTON TRANSACTIONS

收录刊物：SCIE

卷号：47

期号：24

页面范围：8052-8062

ISSN号：1477-9226

摘要：A novel strategy for the fabrication of vanadium nitride (VN) and vanadium carbide (VC) encapsulated into amorphous carbon nanotube core-shell structured composites (denoted as VN@C and VC@C) was developed by the thermal treatment with H2V3O8@C core-shell composites under N-2 and Ar atmospheres, respectively. The as-prepared VN@C and VC@C were comprised of core-shell structures with cores of crystalline VN particles and particles and shells of amorphous carbon nanotubes. There are some O elements remaining both in VN@C and VC@C. VN@C and VC@C exhibited hierarchically porous structures ranging from mesopores to macropores and high specific surface areas, which reached 222 and 164 m(2) g(-1), respectively. Symmetric supercapacitor (SSC) devices using VN@C and VC@C (denoted as VN@C SSC and VC@C SSC) were assembled and they showed good pseudocapacitive properties and were promising electrode materials for electrochemical capacitors. The VN@C SSC device exhibited better electrochemical performance including specific capacitance, areal energy density and cycling stability than the VC@C SSC device. The present findings revealed that VN@C and VC@C could be considered as potential materials for high-performance energy storage materials.