An Efficient Anti‐poisoning Catalyst against SOx, NOx, and POx: P, N‐Doped Carbon for Oxygen Reduction in Acidic Media. (18th October 2018)

• Record Type: Journal Article
• Authors: Najam, Tayyaba; Shah, Syed Shoaib Ahmad; Ding, Wei; Jiang, Jinxia; Jia, Li; Yao, Wang; Li, Li; Wei, Zidong
• Is Part Of: Angewandte Chemie. Volume 130:Number 46(2018)
• Page Start: 15321
• Page End: 15326
• Publication Date: 2018-10-18
• Subjects: Katalysatorvergiftung -- Metallfreie Elektrokatalysatoren -- P, N-dotierter Kohlenstoff -- PEMFCs -- Sauerstoffreduktion; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201808383
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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 H2 –O2 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 H2 O2, indicating a four‐electron pathway whereas more than>20 % of H2 O2 was recorded for N‐doped carbon synthesized from PDAP.