期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 494, 期 -, 页码 325-337出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.01.098
关键词
Manganese phosphate; Activated carbon; Graphene foam; Hydrothermal method; Asymmetric supercapacitor; Energy storage
资金
- South African Research Chairs Initiative (SARChI) of the Department of Science and Technology
- National Research Foundation (NRF) of South Africa [61056]
- Al Fashir University
- University of Pretoria
- NRF through SARChI in Carbon Technology and Materials
Manganese phosphate (Mn-3(PO4)(2) hexagonal micro-rods and (Mn-3(PO4)(2) with different graphene foam (GF) mass loading up to 150 mg were prepared by facile hydrothermal method. The characterization of the as-prepared samples proved the successful synthesis of Mn-3(PO4)(2) hexagonal micro-rods and Mn-3(PO4)(2)/GF composites. It was observed that the specific capacitance of Mn-3(PO4)(2)/GF composites with different GF mass loading increases with mass loading up to 100 mg, and then decreases with increasing mass loading up to 150 mg. The specific capacitance of Mn-3(PO4)(2)/100 mg GF electrode was calculated to be 270 F g(-1) as compared to 41 F g(-1) of the pristine sample at a current density of 0.5 A g(-1) in a three electrode cell configuration using 6 M KOH. Furthermore, the electrochemical performance of the Mn-3(PO4)(2)/100 mg GF electrode was evaluated in a two-electrode asymmetric cell device where Mn-3(PO4)(2)/100 mg GF electrode was used as a positive electrode and activated carbon (AC) from coconut shell as a negative electrode. AC//Mn-3(PO4)(2)/100 mg GF asymmetric cell device was tested within the potential window of 0.0-1.4 V, and showed excellent cycling stability with 96% capacitance retention over 10,000 galvanostatic charge-discharge cycles at a current density of 2 A g(-1). (C) 2017 Elsevier Inc. All rights reserved.
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