Sulfur‐Modified Graphitic Carbon Nitride Nanostructures as an Efficient Electrocatalyst for Water Oxidation |
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| Authors: | Vinayak S. Kale Uk Sim Jiwoong Yang Kyoungsuk Jin Sue In Chae Woo Je Chang Arun Kumar Sinha Heonjin Ha Chan‐Cuk Hwang Junghyun An Hyo‐Ki Hong Zonghoon Lee Ki Tae Nam Taeghwan Hyeon |
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| Affiliation: | 1. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, Republic of Korea;2. School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea;3. Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea;4. Interdisciplinary Program for Bioengineering, Seoul National University, Seoul, Republic of Korea;5. Beamline Research Division, Pohang Accelerator Laboratory, POSTECH, Pohang, Republic of Korea;6. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea |
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| Abstract: | There is an urgent need to develop metal‐free, low cost, durable, and highly efficient catalysts for industrially important oxygen evolution reactions. Inspired by natural geodes, unique melamine nanogeodes are successfully synthesized using hydrothermal process. Sulfur‐modified graphitic carbon nitride (S‐modified g‐CN x ) electrocatalysts are obtained by annealing these melamine nanogeodes in situ with sulfur. The sulfur modification in the g‐CN x structure leads to excellent oxygen evolution reaction activity by lowering the overpotential. Compared with the previously reported nonmetallic systems and well‐established metallic catalysts, the S‐modified g‐CN x nanostructures show superior performance, requiring a lower overpotential (290 mV) to achieve a current density of 10 mA cm?2 and a Tafel slope of 120 mV dec?1 with long‐term durability of 91.2% retention for 18 h. These inexpensive, environmentally friendly, and easy‐to‐synthesize catalysts with extraordinary performance will have a high impact in the field of oxygen evolution reaction electrocatalysis. |
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| Keywords: | electrocatalysis graphitic carbon nitride nanostructures oxygen evolution reaction |
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