Simultaneous formation of nitrogen and sulfur-doped transition metal catalysts for oxygen reduction reaction through pyrolyzing carbon-supported copper phthalocyanine tetrasulfonic acid tetrasodium salt

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2014.04.136
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume266
Pages8898; # of pages: 11
SubjectCarbon; Electrolytic reduction; Electron transitions; Loading; Nitrogen; Sulfur; Transition metal compounds; Active site; Copper phthalocyanine; Copper phthalocyanine tetrasulfonic acid; Doped carbons; Electrochemical measurements; Oxygen reduction reaction; Physical characterization; Transition metal catalysts; Catalyst activity
AbstractIn this work, we report a spontaneous formation of copper (Cu-N-S/C) catalysts containing both nitrogen (N) and sulfur (S) elements using a one-step pyrolysis of carbon supported copper phthalocyanine tetrasulfonic acid tetrasodium salt (CuTSPc/C). The obtained catalysts exhibit high catalytic activities for oxygen reduction reaction (ORR) in alkaline media. Through electrochemical measurements and physical characterizations, several observations are reached as follows: (1) different pyrolysis temperatures can result in different catalyst structures and performances, and the optimum pyrolysis temperature is found to be 700 °C; (2) the electron transfer number of the ORR process catalyzed by the unpyrolyzed catalyst is about 2.5, after the pyrolysis, this number is increased to 3.5, indicating that the pyrolysis process can change the ORR pathway from a 2-electron transfer dominated process to a 4-electron transfer dominated one; (3) increasing catalyst loading from 40 μg cm-2 to 505 μg cm-2 can effectively improve the catalytic ORR activity, under which the percentage of H2O2 produced decreases sharply from 39.5% to 7.8%; and (4) the Cu ion can bond on pyridinic-N, graphite-N and C-Sn-C to form Cu-N-S/C catalyst active sites, which play the key role in the ORR activity. © 2014 Elsevier B.V. All rights reserved.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21272270
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Record identifier5b43be18-88b1-4c54-bf80-b74cbd3083de
Record created2014-07-23
Record modified2016-05-09
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