Graphene-oxide-intercalated layered manganese oxides as an efficient oxygen reduction reaction catalyst in alkaline media
- Graphene-oxide-intercalated layered manganese oxides as an efficient oxygen reduction reaction catalyst in alkaline media
- 박희영; 신태주; 조한익; 장종현; 안도천; 유성종
- electrolysis; fuel cell; MnO2; graphene; Oxygen reduction reaction; Layered MnO2; Graphene oxide intercalation
- Issue Date
- Electrochemistry communications
- VOL 41, NO 4, 35-38
- A graphene-oxide-intercalated layered manganese oxide (GO-HLMO) was prepared by intercalating graphene oxide (GO) into the protonated layered manganese oxide (HLMO, H0.32MnO2), and its enhanced activity towards oxygen reduction reactions (ORR) in alkaline media was demonstrated. As a result of GO intercalation, decreases in interlayer distance and in Mn oxidation state were experimentally confirmed by X-ray diffraction (XRD), X-ray absorption near-edge structure (XANES), and X-ray photoelectron spectroscopic (XPS) analysis. Cyclic voltammetry (CV) analysis indicated that GO-HLMO had more accessible Mn(III)/Mn(IV) sites than HLMO, which probably resulted in the large enhancement in ORR activity in alkaline media, from 0.236 A g− 1 (HLMO) to 0.735 A g− 1 (GO-HLMO) at 0.8 V vs. RHE.
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