Tuning polyoxometalate composites with carbonaceous materials towards oxygen bifunctional activity. Issue 14 (26th March 2021)

• Record Type: Journal Article
• Authors: Nagaiah, Tharamani C.; Gupta, Divyani; Adhikary, Subhasis Das; Kafle, Alankar; Mandal, Debaprasad
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 14(2021)
• Page Start: 9228
• Page End: 9237
• Publication Date: 2021-03-26
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta10423j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Polyoxometalate composites with carbon nanotubes (PVIM–CoPOM/NCNT) towards oxygen bifunctional activity. Abstract : Oxygen electrochemistry plays an imperative role in renewable energy systems. Development of non-precious metals and efficient bifunctional catalysts for the oxygen reduction reaction and oxygen evolution reaction (ORR & OER) is highly demanded for metal–air batteries. Herein, a conjugate of tetra-cobalt sandwich polyoxometalate [Co4 (H2 O)2 (PW9 O34 )2 ] 10− (CoPOM) and polyvinyl butyl imidazolium (PVIM) (PVIM–CoPOM) supported on carbonaceous materials was explored as an oxygen bifunctional catalyst in alkaline media. The PVIM–CoPOM/NCNT composite is highly active towards ORR and OER. The novel composite exhibits a low overpotential ( η j 10 ) of 0.28 V vs. RHE for OER, outperforming the state-of-the-art RuO2 catalyst (0.35 V), and a comparable ORR activity to Pt/C with similar overall oxygen electrode activity to the benchmark precious metal catalyst. A conventional Zn–air battery with the PVIM–CoPOM/NCNT air cathode shows high energy density and a low charge–discharge potential gap.