• 文献标题:   Enhanced oxygen reduction performance of nitrogen and sulfur Co-doped graphene oxide by immobilized ionic liquid
  • 文献类型:   Article
  • 作  者:   ZHANG WL, ZHANG YK, LI YD, YANG SC, ZHANG LH, YU FS
  • 作者关键词:   oxygen reduction reaction, nitrogen sulfur codoping, ionic liquid, metalfree catalyst, heterogeneou
  • 出版物名称:   CHEMICAL ENGINEERING SCIENCE
  • ISSN:   0009-2509 EI 1873-4405
  • 通讯作者地址:  
  • 被引频次:   7
  • DOI:   10.1016/j.ces.2021.116544 EA MAR 2021
  • 出版年:   2021

▎ 摘  要

The development of robust metal-free catalysts for electrochemical oxygen reduction reaction (ORR) is a great challenge due to the large energy barriers for the intermediate *OO- formation. In this work, an ionic liquid (IL) modified N/S co-doped graphene oxide (IL-SNG) was synthesized and explored as a metal-free ORR catalyst in alkaline conditions. Compared to the electrode without IL modification (SNG), the onset and half-wave potentials of IL-SNG were positively shifted by 130 and 110 mV, respec-tively. The IL and co-doping effects enable IL-SNG a comparable activity to that of Pt/C catalyst in alkaline solution. In addition to impressive activity, IL-SNG exhibits a superior tolerance to methanol and excel-lent long-term stability over Pt/C under the identical conditions, enabling it a potential candidate for ORR in alkaline conditions. DFT calculation shows that IL enhances O-2 adsorption and stabilizes the high-energy *OO- intermediate by forming ion pairs and therefore boosts the catalytic activity. (C) 2021 Elsevier Ltd. All rights reserved.