Journal
CARBON
Volume 145, Issue -, Pages 53-60Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.01.002
Keywords
N,S-enriched carbon hybrid; Iron group metal sulphides; Synergetic effect; Oxygen reduction reaction; Al-air batteries
Funding
- Science and Technology Ministry of China (863 project) [2012AA062302]
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To rational design non-noble catalysts with oxygen reduction reaction (ORR) activity and durability superior to that of Pt/C, we report the fabrication of iron group metal sulphides immobilized inside hierarchically porous N,S-enriched carbon architecture using a facile double-phase encapsulation approach followed by a pyrolysis process. The as-prepared hybrid architectures exhibit significantly enhanced electrocatalytic activity towards the ORR, including a positive onset potential, low Tafel slope, and high electron transfer number. In particular, the ORR activity of FeS@G/NSC is even superior to that of the Pt/C benchmark, which possesses an outstanding onset potential (0.99 V vs RHE) and a high discharge voltage plateau (similar to 1.47 V at discharge current density of 50 mA cm(-2) in the Al-air battery test) with excellent stability. These hybrid carbon architectures provide a new direction for carbon-based ORR electrocatalysts performance optimization for next-generation air batteries. (c) 2019 Elsevier Ltd. All rights reserved.
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