期刊
NANOSCALE
卷 7, 期 7, 页码 3155-3163出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr06286h
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资金
- Jiangsu Provincial Funds for Distinguished Young Scholars [BK20130046]
- Qing Lan Project
- NNSF of China [21275076, 61328401]
- Key Project of Chinese Ministry of Education [2012058]
- Program for New Century Excellent Talents in University [NCET-13-0853]
- Research Fund for the Doctoral Program of Higher Education of China [20123223110008]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
N-doped carbon coated NixCo9-xS8 (NixCo9-xS8@C) hollow urchins have been synthesized via a two-step solvothermal synthesis and an in situ polymerization in dopamine together with a post-annealing process. The characterization indicated that NixCo9-xS8@C hollow urchins have urchin-like morphology and a uniform size distribution. Furthermore, there is a complete phrase transformation from the as obtained NiCo2S4/NixCo9-xS8 hybrid to NixCo9-xS8 during the thermal annealing process. More importantly, as electrochemical materials, NixCo9-xS8@C has a high specific capacitance (1404.0 F g(-1) at 2.0 A g(-1)) and excellent cycling performance (95.8% capacitance retention of the highest value after 2000 cycles). These results can be attributed to the coating of N-doped carbon, which gives the composite good conductivity. Additionally, the phase transformation from NiCo2S4/NixCo9-xS8 to NixCo9-xS8 during the thermal annealing greatly enhanced the redox reaction of the Co and Ni species.
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