Open AccessParticle-Size Effect of Pt Anode Catalysts on H2O2 Production Rate and H2 Oxidation Activity at 20 to 80 °C
Author(s) -
Hiroyuki Uchida,
Guoyu Shi,
Muhammad Imran,
Donald A. Tryk
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac4b86
Subject(s) - catalysis , anode , chemistry , electrolyte , hydrogen , production rate , particle size , adsorption , reaction rate , inorganic chemistry , analytical chemistry (journal) , electrode , organic chemistry , industrial engineering , engineering
Polymer electrolyte membranes (PEMs) for fuel cells are chemically degraded by ·OH radicals, generated from H 2 O 2 , which is produced by a reaction of hydrogen adsorbed on the Pt anode with O 2 diffusing through the PEM. In order to obtain a clue for designing the anode catalyst with low production rate of H 2 O 2 and high activity for the hydrogen oxidation reaction (HOR), we have examined the H 2 O 2 production rate at Pt catalysts as a function of particle size d Pt ranging from 2 nm to 20 nm over a practical temperature range between 20 and 80 °C in 0.1 M HClO 4 . The H 2 O 2 production rate [per geometric area with 1.5 to 2-layer height of catalyst layer] was found to decrease with increasing d Pt , accompanied by a penalty of decreased mass activity for the HOR. The use of Pt skin-covered PtCo/C is shown to be an attractive potential solution, providing a breakthrough in simultaneously achieving low H 2 O 2 production and high HOR activity.