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Kale, Vinayak S., Sim, Uk, Yang, Jiwoong, Jin, Kyoungsuk, Chae, Sue In, Chang, Wee Je, Sinha, Arun Kumar, Ha, Heonjin, Hwang, Chan-Cuk, An, Junghyun, Hong, Hyo-Ki, Lee, Zonghoon, Nam, Ki Tae, Hyeon, Taeghwan Show More Hide
Wiley-Blackwell, WILEY-V C H VERLAG GMBH
Biochemistry, Genetics and Molecular Biology, Materials Science, Engineering
article description
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 ) electrocatalysts are obtained by annealing these melamine nanogeodes in situ with sulfur. The sulfur modification in the g-CN 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 nanostructures show superior performance, requiring a lower overpotential (290 mV) to achieve a current density of 10 mA cm and a Tafel slope of 120 mV dec 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.