High catalytic activity of oxygen-vacancy-rich tungsten oxide nanowires supported by nitrogen-doped reduced graphene oxide for the hydrogen evolution reaction. Issue 40 (4th October 2018)

• Record Type: Journal Article
• Authors: Wondimu, Tadele Hunde; Chen, Guan-Cheng; Chen, Hsueh-Yu; Kabtamu, Daniel Manaye; Bayeh, Anteneh Wodaje; Wang, Kai-Chin; Huang, Hsin-Chih; Wang, Chen-Hao
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 40(2018)
• Page Start: 19767
• Page End: 19774
• Publication Date: 2018-10-04
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta07000h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The synergy effect of oxygen vacancy-rich WOxNWs and N-rGO support enhances the activity of WOxNWs/N-rGO. Abstract : This paper reports on a catalyst composed of oxygen-vacancy-rich tungsten oxide nanowires supported by nitrogen-doped reduced graphene oxide (WOxNWs/N-rGO), which has an excellent catalytic activity for the hydrogen evolution reaction (HER) in an acid solution. WOxNWs/N-rGO were synthesized by solvothermally coupling tungsten oxide nanowires with melamine/graphene oxide followed by annealing. The WOxNWs/N-rGO exhibit only 40 mV of overpotential to afford a current density of 10 mA cm −2, which is only 7.01 mV greater than that of Pt/C but 4.90 and 9.90 mV less than those of WOxNWs/rGO and WOxNWs, respectively. A durability test of WOxNWs/N-rGO reveals only a 14 mV overpotential shift after 5000 cycles at a large current density of 100 mA cm −2 . At a constant overpotential of 55 mV, the WOxNWs/N-rGO activity also exhibits a slight degradation of approximately 5.4% after 12 h. The outstanding performance of the WOxNWs/N-rGO for the HER is attributed to the synergetic effect between the oxygen-vacancy-rich WOxNWs and N-rGO.