Facile synthesis of ruhtenium nanoparticles capped by graphene and thiols for high-performance supercapacitors. (20th September 2021)

• Record Type: Journal Article
• Authors: Guo, Yan; Li, Zhuang; Xia, Yujie; Wei, Yuxi; Zhang, Juntao; Wang, Yayi; He, Hui
• Is Part Of: Electrochimica acta. Volume 391(2021)
• Publication Date: 2021-09-20
• Subjects: Ruthenium -- Graphene -- Nanoparticles -- Supercapacitor -- Specific capacitance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138990
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Ru@G and Ru@thiol nanoparticles were prepared by chemical reduction methods. Ru@G exhibited a specific capacitance of 1013 f g − 1 at 0.004 V s − 1 scan rate. Ru@G achieved an energy density of 34.8 W kg −1 at a power density of 1.79 × 10 5 W kg −1 . The capacitance of Ru@G can retain 94.9% after 10, 000 cycles. Ru@thiol showed exponentially reduced capacitance as the growth of carbon chain. Abstract: 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 H2 SO4 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 × 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. Abstract : Image, graphical abstract