Contribution of B, N-co-doped reduced graphene oxide as a catalyst support to the activity of iridium oxide for oxygen evolution reaction. Issue 14 (23rd March 2021)

• Record Type: Journal Article
• Authors: Joshi, Prerna; Yadav, Rohit; Hara, Masanori; Inoue, Tetsunari; Motoyama, Yukihiro; Yoshimura, Masamichi
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 14(2021)
• Page Start: 9066
• Page End: 9080
• Publication Date: 2021-03-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta00158b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Improved performance of an IrO2 nanoparticle catalyst because of the B–N, B–C, and N–C functional groups and conductive rGO network in BN-rGO. Abstract : The current research deals with the study of boron and nitrogen co-doped reduced graphene oxide (BN-rGO) as a support material for iridium oxide (IrO2 ) nanoparticles for oxygen evolution reaction (OER) catalysis. The synthetic approach for the IrO2 –BN-rGO catalyst involves the combination of pyrolysis and hydrothermal methods used for hierarchical nanostructures. BN-rGO possesses B–N, B–C, and N–C functional groups to support and stabilize the IrO2 catalyst nanoparticles. The altered electronic states of IrO2 on the BN-rGO support are compared with those of IrO2 on a non-doped support, rGO (IrO2 –rGO), and on commercial BN sheets (IrO2 –c-BN). The catalyst shows a low overpotential (300 mV at 10 mA cm −2 ), high current density (55 mA cm −2 at 1.65 V), and significantly high durability (12 350 cycles; 45 h) in an acidic environment. The high stability of IrO2 –BN-rGO may result from the presence of a chemically and electrochemically stable B–N bond. We confirm that other functional groups (B–C and N–C) and the rGO framework are equally crucial for better attachment of IrO2 nanoparticles.