Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 40, Pages 35040-35047Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12069
Keywords
metal-organic frameworks; manganese dioxide nanosheets; cobalt sulfide; hollow nanocages array; electrochemical capacitors
Funding
- National Natural Science Foundation of China [21773188]
- Fundamental Research Funds for the Central Universities [XDJK2017D003, XDJK2017B055]
- Program for Excellent Talents in Chorigqing [102060-20600218]
- Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
- Chongqing Key Laboratory for Advanced Materials and Technologies
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Metal-organic framework (MOF)-derived hollow cobalt sulfides have attracted extensive attention due to their porous shell that provides rich redox reactions for energy storage. However, their ultradispersed structure and the large size of MOF precursors result in relatively low conductivity, stability, and tap density. Therefore, the construction of an array of continuous hollow cages and tailoring of the inner cavity of MOF-derived materials is very effective for enhancing the electrochemical performance. Herein, we in situ assembled small Co-based zeolitic imidazolate framework (ZIF-67) on the both sides of negatively charged MnO2 nanosheets to fabricate a hierarchical sandwich-type composite with hollow cobalt sulfide nanocages/graphene-like MnO2. The graphene-like MnO2 nanosheets acted not only as a structure-directing agent to grow a ZIF-67 array but also as a promising electroactive material of electrochemical capacitors to provide capacitance. As electrode material of supercapacitors, the as-prepared composites exhibit high specific capacitance (1635 F g(-1) at 1 A g(-1)), great rate performance (reaching 1160 F g(-1) at 10 A g(-1)), and excellent cycling stability (80% retention after 5000 cycles). The outstanding electrochemical properties of our designed materials can be attributed to the unique nanostructure that improved electrical conductivity, created more reactive active sites, and increased the diffusion pathway for electrolyte ions.
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