Synthesis of Nanoporous Carbon–Cobalt‐Oxide Hybrid Electrocatalysts by Thermal Conversion of Metal–Organic Frameworks |
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| Authors: | Dr. Watcharop Chaikittisilp Dr. Nagy L. Torad Dr. Cuiling Li Dr. Masataka Imura Dr. Norihiro Suzuki Dr. Shinsuke Ishihara Prof. Dr. Katsuhiko Ariga Prof. Dr. Yusuke Yamauchi |
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| Affiliation: | 1. World Premier International (WPI) Research Center for Materials, Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1–1 Namiki, Tsukuba, Ibaraki 305‐0044 (Japan), Homepage: http:www.yamauchi‐labo.com;2. Faculty of Science and Engineering, Waseda University, 3–4–1 Okubo, Shinjuku, Tokyo 169‐8555 (Japan);3. Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1–1 Namiki, Tsukuba, Ibaraki 305‐0044 (Japan);4. International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1–2–1 Sengen, Tsukuba, Ibaraki 305‐0047 (Japan);5. Precursory Research for Embryonic Science and Technology (PRESTO) & Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), 1–1 Namiki, Tsukuba, Ibaraki 305‐0044 (Japan) |
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| Abstract: | Nanoporous carbon–cobalt‐oxide hybrid materials are prepared by a simple, two‐step, thermal conversion of a cobalt‐based metal–organic framework (zeolitic imidazolate framework‐9, ZIF‐9). ZIF‐9 is carbonized in an inert atmosphere to form nanoporous carbon–metallic‐cobalt materials, followed by the subsequent thermal oxidation in air, yielding nanoporous carbon–cobalt‐oxide hybrids. The resulting hybrid materials are evaluated as electrocatalysts for the oxygen‐reduction reaction (ORR) and the oxygen‐evolution reaction (OER) in a KOH electrolyte solution. The hybrid materials exhibit similar catalytic activity in the ORR to the benchmark, commercial, Pt/carbon black catalyst, and show better catalytic activity for the OER than the Pt‐based catalyst. |
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| Keywords: | cobalt oxide electrocatalysts mesoporous carbon metal– organic frameworks nanoporous carbon |
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