Bifunctional Electrocatalytic Activity of Boron-Doped Graphene Derived from Boron Carbide

被引:144
作者
Vineesh, Thazhe Veettil [1 ]
Kumar, M. Praveen [1 ]
Takahashi, Chisato [2 ]
Kalita, Golap [3 ]
Alwarappan, Subbiah [1 ]
Pattanayak, Deepak K. [1 ]
Narayanan, Tharangattu N. [4 ]
机构
[1] CSIR CECRI, Cent Electrochem Res Inst, Karaikkudi 630006, Tamil Nadu, India
[2] Aichi Gakuin Univ, Sch Pharm, Pharmaceut Engn, Chikusa Ku, Nagoya, Aichi 4648650, Japan
[3] Nagoya Inst Technol, Nagoya, Aichi 4668555, Japan
[4] Tata Inst Fundamental Res, TIFR Ctr Interdisciplinary Sci TCIS, Hyderabad 500075, Andhra Pradesh, India
关键词
bifunctional catalysts; regenerative fuel cells; electrocatalysis; doped graphene; oxygen reduction reaction; CATALYST-FREE SYNTHESIS; OXYGEN REDUCTION; CARBON NANOTUBES; HIGHLY EFFICIENT; WATER OXIDATION; GRAPHITE OXIDE; LAYERS; SULFUR;
D O I
10.1002/aenm.201500658
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A single material that can perform water oxidation and oxygen reduction reactions (ORR), also called bifunctional catalyst, represents a novel concept that emerged from recent materials research and that has led to applications in new-generation energy-storage systems, such as regenerative fuel cells. Here, metal/metal-oxide free, doped graphene derived from rhombohedral boron carbide (B4C) is demonstrated to be an effective bifunctional catalyst for the first time. B4C, one of the hardest materials in nature next to diamond and cubic boron nitride, is converted and separated in bulk to form heteroatom (boron, B) doped graphene (BG, yield approximate to 7% by weight, after the first cycle). This structural conversion of B4C to graphene is accompanied by in situ boron doping and results in the formation of an electrochemically active material from a non-electrochemically active material, broadening its potential for application in various energy-related technologies. The electrocatalytic efficacy of BG is studied using various voltammetric techniques. The results show a four-electron transfer mechanism as well as a high methanol tolerance and stability towards ORR. The results are comparable to those from commercial 20 wt% Pt/C in terms of performance. Furthermore, the bifunctionality of the BG is also demonstrated by its performance in water oxidation.
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页数:8
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