Journal
NANO
Volume 14, Issue 12, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1793292019501480
Keywords
Cobalt-based phosphate; metal organic framework; carbon; supercapacitor; oxygen evolution
Funding
- PetroChina Innovation Foundation [2016D-5007-0401, 2016E-0702]
- Shandong Natural Science Foundation [ZR2017MA024, ZR2016BM12]
- Fundamental Research Funds for the Central Universities [18CX07002A, 18CX05011A, 18CX02042A, 19CX05001A]
- Postgraduate Innovation Project of China University of Petroleum [YCX2019073]
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The increasing energy crisis promotes the study on novel electrode materials with high performance for supercapacitive storage and energy conversion. Transition metal phosphates have been reported as a potential candidate due to the unique coordination and corresponding electronic structure. Herein, we adopted a facile method for preparing NaCoPO4@PC derived from a metal organic framework (MOF) as a bifunctional electrode. ZIF-67 was synthesized before a refluxing process with Na2HPO4 to form a precursor, which is transformed into the final product via calcination in different atmospheres. Specifically, the resultant NaCoPO4@PC exhibits a high specific capacitance of 1178.7 F g(-1) at a current density of 1 A g(-1) for a supercapacitor. An asymmetric supercapacitor (ASC) assembled with active carbon displays a high capacitance of 163.7 F g(-1) at 1 A g(-1). In addition, as an oxygen evolution reaction (OER) catalyst, the NaCoPO4@C electrode requires only 299 mV to drive a current density of 10 mA cm(-2) . These results suggest that the rational design of MOF-derived NaCoPO4@PC provides a variety of practical applications in electrochemical energy conversion and storage.
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