Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 13, Pages 16297-16304Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.05.155
Keywords
Nanoparticles; Pseudocapacitive; Valence state; Mn3O4; Asymmetric supercapacitor
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Funding
- National Grid Science and Technology Project Research on the Key Issues of Macro Strategy in the Construction of Global Energy Internet [SGSDDK00KJJS1600067]
- Shandong Provincial Independent Innovation and Technology Conversion Project [2014CGZH912]
- Natural Science Foundation of Jiangsu Province [BK20180229]
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In this work, a facile method to produce the ultrafine (4-14 nm) and mixed valence Mn3O4 nanoparticles from low-cost MnSiO3 (manganese silicate) particles were introduced. The best NaOH concentration in hydrothermal treatment has been determined after a series of experiments. Also, the as-synthesized Mn3O4 material with good specific capacitance has been investigated attentively at a high mass loading (similar to 3 mg cm(-2)). The particles size and the pore size distribution is found to be refined and optimized, respectively. This increased the crystallinity and the capacitive contribution in the energy process. Thereby improving the rate capability and cycling stability, which result in significant improvement of specific capacitance (401 F g(-1) at 10 mV s(-1)). The aqueous asymmetric supercapacitor device AC//Mn3O4 with a stable working voltage window up to 2.0 V has been fabricated, and it is found to have an energy density of 40.2 W h kg(-1) at 500 W kg(-1) power density. This could sustain 5000 cycles galvanostatic charge/discharge with 96.9% retention.
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