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Ethanol Electrooxidation on Rhodium–Lead Catalysts in Alkaline Media: High Mass Activity, Long‐Term Durability, and Considerable CO 2 Selectivity
Author(s) -
Lan Bing,
Huang Min,
Wei RuiLin,
Wang ChaoNan,
Wang QiongLan,
Yang YaoYue
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202004380
Subject(s) - rhodium , catalysis , selectivity , adsorption , chemistry , ethanol , oxide , inorganic chemistry , durability , anode , materials science , organic chemistry , electrode , composite material
Rhodium (Rh)‐based catalysts may solve the long‐standing inefficient oxidation of ethanol for direct ethanol fuel cells (DEFCs); however, the performance of ethanol oxidation reaction (EOR) on existing Rh‐based catalysts are far limited. Herein, the Rh–Pb catalysts are synthesized by building Pb and Pb oxide around Rh nanodomain, which shows highly efficient splitting CC bond and facile further oxidation of as‐generated C1 intermediates (CO ad and CH x fragments). It exhibits an ever‐highest EOR peak mass activity of ≈2636 mA mg −1 Rh among Rh‐based catalysts in alkaline media. Meanwhile, its anodic current remains ≈50% even after a 4 h durability test at 0.53 V versus RHE. As for the C1‐pathway selectivity, in situ infrared adsorption spectral (IRAS) results demonstrate that it could significantly improve the production of CO 2 . More directly, the apparent faraday efficiency of EOR C1 pathway is estimated to be as high as 20% (at 0.53 V versus RHE). This Rh–Pb catalyst could hold great promise for developing the commercial DEFCs.