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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Impact of Textural Properties of Mesoporous Porphyrinic Carbon Electrocatalysts on Oxygen Reduction Reaction Activity

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Title
Impact of Textural Properties of Mesoporous Porphyrinic Carbon Electrocatalysts on Oxygen Reduction Reaction Activity
Author
Woo, JinwooSa, Young JinKim, Jae HyungLee, Hyun-WookPak, ChanhoJoo, Sang Hoon
Keywords
template method; electrocatalysis; oxygenreduction reaction; textural properties; Fe-N/C catalyst
Issue Date
201807
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMELECTROCHEM, v.5, no.14, pp.1928 - 1936
Abstract
Transition-metal- and N-codoped carbon (M-N/C) catalysts have shown great promise as alternatives to Pt-based catalysts in the oxygen reduction reaction (ORR). The preparation of M-N/C catalysts by exploiting mesoporous silica templates is highly appealing as this method can generate catalysts with high surface areas, well-developed porosities, and abundant active sites. Herein, we report the relationship between the textural properties of mesoporous silica-templated Fe-N/C catalysts and their ORR activity. Iron-doped mesoporous porphyrinic carbons (Fe-MPCs) with varying textural properties were synthesized through nanocasting using mesoporous silicas as the templates and Fe porphyrin as the precursor. Fe-MPC catalysts showed excellent ORR activities with half-wave potentials reaching 0.82V and 0.90V (vs. reversible hydrogen electrode, RHE) in acidic and alkaline electrolytes, respectively. Fe-MPC catalysts with smaller particle sizes, larger mesopore sizes, and three dimensionally interconnected pore structures showed enhanced ORR activities.
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DOI
http://dx.doi.org/10.1002/celc.201800183
ISSN
2196-0216
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