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An Efficient Anti‐poisoning Catalyst against SO x , NO x , and PO x : P, N‐Doped Carbon for Oxygen Reduction in Acidic Media
Author(s) -
Najam Tayyaba,
Shah Syed Shoaib Ahmad,
Ding Wei,
Jiang Jinxia,
Jia Li,
Yao Wang,
Li Li,
Wei Zidong
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201808383
Subject(s) - catalysis , pyrolysis , electrocatalyst , chemistry , carbon fibers , doping , oxygen reduction reaction , metal , oxygen reduction , oxygen , inorganic chemistry , materials science , electrode , electrochemistry , organic chemistry , optoelectronics , composite material , composite number
Electrocatalysts are readily poisoned during the catalysis of the oxygen reduction reaction (ORR); even air containing traces of SO x and/or NO x significantly decrease the activity and the durability of H 2 –O 2 fuel cells. Now, a metal‐free strategy is reported to develop an efficient anti‐poisoning ORR catalyst, which involves the pyrolysis of PDAP‐phytic acid super‐molecular aggregate (PPSA). The pyrolyzed co‐doped carbon acting as a metal‐free electrocatalyst shows an enhanced activity for ORR in acidic medium, even under poisoning conditions (SO x , NO x , and PO x ). Moreover, P‐doping also changes the ORR pathway by yielding less than 4 % of H 2 O 2 , indicating a four‐electron pathway whereas more than>20 % of H 2 O 2 was recorded for N‐doped carbon synthesized from PDAP.