期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 15, 页码 7335-7340出版社
AMER CHEMICAL SOC
DOI: 10.1021/am401680m
关键词
nickel sulfide; reduced graphene oxide; bacteria; supercapacitors; nm-mu m structure
资金
- National Natural Science Foundation of China [21003041, 21103046]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120161110016]
- Hunan Provincial Natural Science Foundation of China [10JJ1011, 11JJ7004]
Supercapacitors with potential high power are useful and have attracted much attention recently. Graphene-based composites have been demonstrated to be promising electrode materials for supercapacitors with enhanced properties. To improve the performance of graphene-based composites further and realize their synthesis with large scale, we report a green approach to synthesize bacteria-reduced graphene oxide-nickel sulfide (BGNS) networks. By using Bacillus subtilis as spacers, we deposited reduced graphene oxide/Ni3S2 nanoparticle composites with submillimeter pores directly onto substrate by a binder-free electrostatic spray approach to form BGNS networks. Their electrochemical capacitor performance was evaluated. Compared with stacked reduced graphene oxide-nickel sulfide (GNS) prepared without the aid of bacteria, BGNS with unique nm-mu m structure exhibited a higher specific capacitance of about 1424 F g(-1) at a current density of 0.75 A g(-1). About 67.5% of the capacitance was retained as the current density increased from 0.75 to 15 A g(-1). At a current density of 75 A g(-1), a specific capacitance of 406 F g(-1) could still remain. The results indicate that the reduced graphene oxide-nickel sulfide network promoted by bacteria is a promising electrode material for supercapacitors.
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