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Fabricating Sulfur/Oxygen Co‐Doped Crumpled Graphene for High‐Performance Oxygen Reduction Reaction Electrocatalysis
Author(s) -
Guo Mei,
Qiu Chaochao,
Li Yu,
Jin Xiuyan,
Zhang Guoxin,
Sun Xiaoming
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701158
Subject(s) - graphene , electrocatalyst , oxide , catalysis , materials science , graphite oxide , graphite , doping , oxygen , chemical engineering , electrochemistry , nanotechnology , sulfur , electrode , inorganic chemistry , chemistry , composite material , organic chemistry , optoelectronics , metallurgy , engineering
Herein, defect‐rich graphene oxide with a crumpled form was fabricated through the fast thermal expansion of H 2 SO 4 ‐intercalated graphite oxide. The fast removal of intercalated H 2 SO 4 molecules and by‐product gases result in the formation of crumpled edges, whereas the partial reduction of H 2 SO 4 leads to a large amount of defects and minor S doping (ca. 0.55 at%). The expanded graphene oxide with a crumpled form and rich defects was used as electrode materials for the oxygen reduction reaction (ORR), and a very high ORR performance was observed in 0.1 mol L −1 KOH, exhibiting an onset potential of 0.92 V, a half‐wave potential of 0.83 V, and a roughly 5.68 mA cm −2 limiting current density with catalyst loading of 0.1274 mg cm −2 . Our work provides reliable GO‐based catalyst materials for the ORR; moreover, it will expand the knowledge one type of high‐activity site for the ORR: defects on crumpled edges.