FexCo3−xO4 Nanohybrids Anchored on a Carbon Matrix for High‐Performance Oxygen Electrocatalysis in Alkaline Media. Issue 19 (11th October 2022)

• Record Type: Journal Article
• Authors: Hazarika, Kumar K.; Chutia, Bhugendra; Changmai, Rabu R.; Boruah, Purna K.; Das, Manash R.; Bharali, Pankaj
• Is Part Of: ChemElectroChem. Volume 9:Issue 19(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-11
• Subjects: Electrocatalysis -- Iron-cobalt oxides -- carbon matrix -- oxygen reduction reaction -- oxygen evolution reaction; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202200867
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Herein, we report a systematic study of nanohybrids (NHs) of various Fe−Co oxides anchored on to carbon matrix for high‐performing oxygen electrode reactions. Fe2.1 Co0.9 O4 /C NH having minor content of Co 3+ exhibited superior oxygen reduction reaction (ORR) performance than the other compositions and benchmark Pt/C. It exhibits a current density of 8.4 mA cm −2 in 0.1 M KOH for ORR compared to the benchmark Pt/C (3.81 mA cm −2 ). It also reveals superior stability and durability than Pt/C. It can retain 92 % of its initial current up to 7000 s. Also, the Fe2.1 Co0.9 O4 /C NH delivers the best Tafel slope of 72.6 mV dec −1 . Additionally, the Co 3+ rich Fe0.9 Co2.1 O4 /C NH demonstrated superior oxygen evolution reaction (OER) performance than the Pt/C, RuO2 and other compositions in 0.1 M KOH solution. Thus, the obtained electrocatalysts (ECs) having bimetallic active site demonstrates unique electrocatalytic properties and the carbon matrix can increase stability and thus provide additional catalytic active sites. This makes them a significant candidate for oxygen electrocatalysis. Abstract : Oxide Nanohybrids for Oxygen Electrocataysis : Composition controlled performance displayed by Fe−Co mixed oxide nanostructures over carbon support for oxygen electrocatalysis.