Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 22, Pages 10490-10496Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta03131b
Keywords
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Funding
- National Natural Science Foundation of China [21506130, 21490582, 21776187]
- State Key Laboratory of Polymer Materials Engineering [sklpme2017-3-01]
- Fundamental Research Funds for the Central Universities
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Engineering the surface structure and constructing a suitable internal conductive network is essential for the electron transfer rate and the active material utilization efficiency of an electrode. Here, high-porosity carbon nanotube (CNT) arrays grown on graphite foam (GNF) are synthesized via the self-sacrificial ZnO nanorod template. Then three-dimensional Co-doped Ni3S2 nanostructures (Co-Ni3S2) are coated on the CNT surface via a simple hydrothermal process. The CNTs/GNF hybrid with a hierarchical conductive network exhibits good electrical conductivity, while the tectorum-like Co-Ni3S2 nanosheet structure may facilitate both the ion and electron transfer in the redox process. Therefore, the Co-Ni3S2@CNTs/GNF composite shows a highest specific capacitance of 4.1 F cm(-2), good rate performance (57.8% capacitance retention from 1 to 40 mA cm(-2)) and cycling stability (89.8% capacitance retention after 1000 cycles). Moreover, the Co-NNi3S2@CNT/GNF electrode also reveals good hydrogen evolution reaction activity in alkaline solution (an overpotential of 155 mV at 10 mA cm(-2)).
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