N/C doped nano-size IrO2 catalyst of high activity and stability in proton exchange membrane water electrolysis |
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| Affiliation: | 1. Institute of Fuel Cell Composite Power Sources, Clean Energy Automotive Engineering Center, School of Automotive Studies, Tongji University, Shanghai 201804, PR China;2. School of Automotive Studies, Tongji University, Shanghai 201804, PR China;1. Catalysis and Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India;2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India;1. School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China;2. School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, PR China;3. School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China;4. State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, 350108, PR China;5. Fujian Provincial Key Lab of Coastal Basin Environment, Fujian Polytechnic Normal University, Fuqing, Fujian 350300, PR China;1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China;2. National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping 136000, China;3. Key Laboratory of Preparation and Application of Environmental Friendly Materials Ministry of Education, Jilin Normal University, Changchun 130103, China |
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| Abstract: | It is highly desirable to synthesize and deploy low-cost and highly efficient catalysts for the oxygen evolution reaction (OER) to catalyze water splitting. We show that N/C doped amorphous iridium oxide combines the benefits of nano-size (approximately 2 nm), which results in exposure to large active surface areas and features of oxygen defects, which make for an electronic structure suitable for the OER. Systematic studies indicate that the OER activity of the iridium oxide catalyst is accelerated by the effect of the structure and chemical state of the iridium element. Remarkably, the N/C doped amorphous iridium oxide catalyst shows a lower cell voltage of 1.774 V at 1.5 A cm−2, compared with IrO2 (1.847 V at 1.5 A cm−2), and it can maintain such a high current density for over 200 h without noticeable performance deterioration. This work provides a promising method for the improving OER electrocatalysts and the construction of an efficient and stable PEM water cracking system. |
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| Keywords: | Iridium oxide Water electrolysis Proton exchange membrane Oxygen evolution reaction |
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