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https://doi.org/10.1002/advs.201800036
Title: | B, N Codoped and Defect-Rich Nanocarbon Material as a Metal-Free Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions | Authors: | Sun, Tao Wang, Jun Qiu, Chuntian Ling, Xiang Tian, Bingbing Chen, Wei Su, Chenliang |
Keywords: | Science & Technology Physical Sciences Technology Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science boron and nitrogen codoping carbon defects metal-free bifunctional electrocatalysts oxygen evolution reactions oxygen reduction reactions HIGH-PERFORMANCE DOPED GRAPHENE CARBON NANOTUBES POROUS CARBON ACTIVE-SITES FUEL-CELLS NITROGEN BORON CATALYSTS SULFUR |
Issue Date: | 1-Jul-2018 | Publisher: | WILEY | Citation: | Sun, Tao, Wang, Jun, Qiu, Chuntian, Ling, Xiang, Tian, Bingbing, Chen, Wei, Su, Chenliang (2018-07-01). B, N Codoped and Defect-Rich Nanocarbon Material as a Metal-Free Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions. ADVANCED SCIENCE 5 (7). ScholarBank@NUS Repository. https://doi.org/10.1002/advs.201800036 | Abstract: | © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The development of highly active, inexpensive, and stable bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts to replace noble metal Pt and RuO2 catalysts remains a considerable challenge for highly demanded reversible fuel cells and metal–air batteries. Here, a simple approach for the facile construction of a defective nanocarbon material is reported with B and N dopants (B,N-carbon) as a superior bifunctional metal-free catalyst for both ORR and OER. The catalyst is prepared by pyrolyzing the composites of ethyl cellulose and high-boiling point 4-(1-naphthyl)benzeneboronic acid in NH3 atmosphere with an inexpensive Zn-based template. The obtained porous B,N-carbon with rich carbon defects exhibits excellent ORR and OER performances, including high activity and stability. In alkaline medium, B,N-carbon material shows high ORR activity with an onset potential (Eonset) reaching 0.98 V versus reversible hydrogen electrode (RHE), very close to that of Pt/C, a high electron transfer number and excellent stability. This catalyst also presents the admirable ORR activity in acidic medium with a high Eonset of 0.81 V versus RHE and a four-electron process. The OER activity of B,N-carbon is superior to that of the precious metal RuO2 and Pt/C catalysts. A Zn–air battery using B,N-carbon as the air cathode exhibits a low voltage gap between charge and discharge and long-term stability. The excellent electrocatalytic performance of this porous nanocarbon material is attributed to the combined positive effects of the abundant carbon defects and the heteroatom codopants. | Source Title: | ADVANCED SCIENCE | URI: | https://scholarbank.nus.edu.sg/handle/10635/168929 | ISSN: | 2198-3844 | DOI: | 10.1002/advs.201800036 |
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