期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 21, 页码 7742-7746出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00814f
关键词
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资金
- Natural Science Foundation of China [NSFC 21174083]
- National Basic Research Program of China (973 Program) [2012CB933404]
- Shanghai Committee of Science and Technology [11JC1405400]
- Shanghai Pujiang Program [12PJ1405300]
- Shanghai Jiao Tong University (211 Project)
A novel B/N co-doped porous carbon nanosheet with a high heteroatom doping content has been successfully prepared. Using amino-functionalized graphene oxide (GO) as the template, oxidation polymerization of aniline, 3-aminophenylboronic acid, and m-phenylenediamine generates GO-based polyaniline nanosheets functionalized with boronic acid (GO-CBP). After high-temperature treatment, graphene-based B/N co-doped carbon nanosheets (G-CBP) are obtained, which show a typical 2D morphology with a thickness of similar to 20 nm. After CO2 activation at 1000 degrees C, the obtained porous carbon nanosheets (G-CBP-a) have a thickness of similar to 17 nm and a high specific surface area of 363 m(2) g(-1). Benefiting from its high surface area, unique 2D sheet nanostructure, and high heteroatom-doping contents (5.4% B and 5.3% N), G-CBP-a exhibits excellent electrochemical performance for the oxygen reduction reaction under alkaline conditions (0.1 M KOH), with a low half-wave potential (-0.27 V for G-CBP-a versus -0.18 V for Pt/C), a dominant four-electron transfer mechanism (n = 3.78 at -0.45 V), and excellent methanol tolerance and durability (10% current decrease after 20 000 s operation), as well as a high diffusion-limiting current density (J(L) = 4.5 mA cm(-2)).
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