Highly efficient oxygen evolution electrocatalysts prepared by using reduction-engraved ferrites on graphene oxide. Issue 2 (8th December 2017)

• Record Type: Journal Article
• Authors: Tan, Jing-Bo; Sahoo, Pathik; Wang, Jia-Wei; Hu, Yu-Wen; Zhang, Zhi-Ming; Lu, Tong-Bu
• Is Part Of: Inorganic chemistry frontiers. Volume 5:Issue 2(2018)
• Page Start: 310
• Page End: 318
• Publication Date: 2017-12-08
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7qi00681k
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : A simple and efficient method was explored for synthesizing efficient ferrite-based OER electrocatalysts by using reduction-engraved ultrafine ferrite nanoparticles on a conductive GO support. Abstract : Rational design and synthesis of efficient, stable and low-cost electrocatalysts for oxygen evolution reaction (OER) is critical for renewable energy conversion and storage. Herein, the reduction-engraved strategy was adopted to treat crystalline ferrite nanoparticles, which are highly dispersed on graphene oxide (GO) nanosheets. This reduction treatment generated abundant oxygen vacancies on the surface of nano-scale ferrites and dramatically enhanced their surface area, ensuring that the ferrite nanoparticles possess more accessible active sites for OER, and improve their electronic conductivity. Reduced cobalt/nickel ferrite (Co0.5 Ni0.5 Fe2 O4, r-CNF ), cobalt ferrite (CoFe2 O4, r-CF ) and nickel ferrite (NiFe2 O4, r-NF ) nanoparticles anchoring on the ultrathin GO nanosheets can act as highly active, stable and low-cost OER electrocatalysts in 1.0 M KOH solution. The r-CNF (Co : Ni = 1 : 1) on GO (r-CNFg ) shows the best OER performance among the ferrite-based OER electrocatalysts, with an overpotential of 210 mV at 10 mA cm −2 in 1.0 M KOH solution, much more efficient than that of a commercial benchmark catalyst IrO2 (230 mV). The catalytic current density of r-CNFg at 1.49 V vs. RHE is about 50 times higher than that ofCNF andCNFg . Also, it exhibits prominent electrochemical stability over 500 h in 1.0 M KOH.