Journal
ELECTROCHIMICA ACTA
Volume 391, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138990
Keywords
Ruthenium; Graphene; Nanoparticles; Supercapacitor; Specific capacitance
Categories
Funding
- Jiangsu Provincial Key RD Project [BE2016704, BE2016187]
- Six Talent Climax Foundation of Jiangsu Province [2017-JZ-064]
- Practice and Innovation Project of College Students in Jiangsu Province [201910300211, 20201030 0 073]
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Ru nanoparticles capped with graphene or thiols were prepared and their electrochemical performance and stability were evaluated, with Ru@G showing greatly improved properties suitable for electrochemical applications.
Ru nanoparticles (Ru@G, Ru@HT, Ru@DT, and Ru@OT) were prepared by facile chemical reduction of RuCl3 and graphene or thiols. The morphologies and structures of these Ru nanoparticles were ascertained by TEM, FTIR, UV-vis, and XPS, confirming the metallic Ru cores were capped by graphene or thiols. Their applications for supercapacitors were investigated in 0.5 M H2SO4 electrolyte, using cyclic voltammetry, galvanostatic charging-discharging test, and electrochemical impedancemetry. Compared as Ru@HT, Ru@DT, and Ru@OT nanoparticles, Ru@G exhibited greatly improved electrochemical performance and stability. It showed a specific capacitance of 1013 F g(-1) at 0.004 V s(-1) , an energy density of 34.8 W kg(-1) at the power density of 1.79 x 10(-5) W kg(-1), the capacitance retention of 94.9% after 10,000 cycles. The peripheral graphene has good stability and excellent electrical conductivity, so it can provide Ru core stable protection as well as good electron transfer routes, thus Ru@G are suitable for implementation in electrochemical applications. (C) 2021 Elsevier Ltd. All rights reserved.
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