B,N,S tri-doped reduced graphite oxide–cobalt oxide composite: a bifunctional electrocatalyst for enhanced oxygen reduction and oxygen evolution reactions

Abstract

Cobalt oxide with B,N,S tri-doped reduced graphite oxide exhibits synergistic effects to enhance ORR activity.

Microwave‐assisted synthesis of cobalt‐polyoxometalate @carbon black nanocomposites and their electrocatalytic ability toward oxygen reduction reaction

“…The working electrode was prepared by a slight modification of our previously reported method 19 . To maintain the best condition of the working electrode, it was cleaned by polishing on 0.05 μm alumina slurry.…”

“…The working electrode was prepared by a slight modification of our previously reported method. 19 To maintain the best condition of the working electrode, it was cleaned by polishing on 0.05 μm alumina slurry. The prepared catalyst was ground to fine powder in a mortar pestle and 4 mg of catalyst was dissolved in 1 mL solution containing 200 μL IPA, 796 μL DI water, and 4 μL Nafion (5 wt% Sigma-Aldrich) followed by ultrasonication for 30 minutes in water bath.…”

“…It has been revealed from several reports that compounds of Co show good catalytic activity toward redox reactions due to Co active center, 18,19 however the compounds undergo decomposition during operational conditions of the device. 19 Besides, the low surface area and high solubility of POMs in aqueous media limit their electrochemical applications; but the limitation can be overcome using support materials like silica 20 or carbon. 14,21 As the electronic conductivity of the catalyst plays crucial role in its catalytic performance, carbon could be the best option for the support of POMs compared to silica.…”

“…Also, the metallic sites in POMs can be easily substituted by other transition metals that are active for redox reactions, 17 thus combining the properties of both POMs and the substituted transition metal. It has been revealed from several reports that compounds of Co show good catalytic activity toward redox reactions due to Co active center, 18,19 however the compounds undergo decomposition during operational conditions of the device 19 . Besides, the low surface area and high solubility of POMs in aqueous media limit their electrochemical applications; but the limitation can be overcome using support materials like silica 20 or carbon 14,21 .…”

Porous Nitrogen‐doped Reduced Graphene Oxide Gels as Efficient Supercapacitor Electrodes and Oxygen Reduction Reaction Electrocatalysts

“…As bio‐derivatives, amino acids consist of many functional groups (–NH 2 , –COOH), which have been widely used for the preparation of heteroatom doped carbon materials. [ 20‐24 ] For example, Choi et al . synthesized N and S co‐doped materials obtained by the pyrolysis of L ‐cysteine.…”