Abstract
AbstractHerein, we report a systematic study of nanohybrids (NHs) of various Fe−Co oxides anchored on to carbon matrix for high‐performing oxygen electrode reactions. Fe2.1Co0.9O4/C NH having minor content of Co3+ 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 Fe2.1Co0.9O4/C NH delivers the best Tafel slope of 72.6 mV dec−1. Additionally, the Co3+ rich Fe0.9Co2.1O4/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.
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