Dependence on treatment ion energy of nitrogen plasma for oxygen reduction reaction of high ordered pyrolytic graphite

Hashimoto, Yuichi; Huang, Hsin‐Hui; Yoshimura, Masamichi; Hara, Masanori; Hara, Tamio; Hara, Yasuhiro; Hamagaki, Manabu

doi:10.7567/jjap.57.125504

Cited by 2 publications

(1 citation statement)

References 38 publications

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“…We have also demonstrated that graphiticand pyridinic-nitrogen act as reaction sites for ORR on nitrogendoped high ordered pyrolytic graphite (HOPG) prepared by electron-beam-excited plasma treatment. 61,62 Previous researches suggest that the catalytic activity of doping elements for ORR is dependent on both elemental species and its lattice structure. However, for organic molecules, few studies were reported on the investigation of the catalytic activity using heteroatom-doped graphenes.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Activity of Heteroatom-Doped Graphene for Oxidation of Hydroquinones

et al. 2020

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In the present study, we aim to synthesize heteroatom (nitrogen or boron) doped-reduced graphene oxide (N-rGO or B-rGO) as a catalyst for the electro-oxidation of hydroquinones, used as a candidate of fuel (hydrogen carrier molecule) for direct-type fuel cells (DFCs), and evaluate the doping effect on its catalytic activity. N-rGO and B-rGO were prepared from a mixture of graphene oxide (GO) and urea or boron trioxide by pyrolysis method. We characterized the morphology and crystal structure of the prepared materials by transmission electron microscopy, and X-ray diffraction, respectively. Energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy show the loading amount of the heteroatoms, 10.4 wt% N and 2.9 wt% B, as well as their chemical nature. The electrochemical analysis of the prepared materials by rotating disk electrode system reveals high activity of B-rGO, 15 and 85 mV lower overvoltage compared with rGO at the half-wave potential of diffusion-limited current, for the electro-oxidation of hydroquinone and methyl-hydroquinone, respectively, because of its electron-accepting nature. We demonstrate that thus modified carbons exhibit high activity, B-rGO > N-rGO > rGO, for the oxidation of hydroquinone derivatives as non-metallic anodes of DFCs.

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Section: Introductionmentioning

confidence: 99%