Bio-derived nanoporous activated carbon sheets as electrocatalyst for enhanced electrochemical water splitting |
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| Affiliation: | 1. Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, 832003, PR China;2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China;1. New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, Guangdong 510006, China;2. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Science, Beijing 100083, China;3. State Key Laboratory of Crystal Materials, Center of Bio & Micro/Nano Functional Materials, Shandong University, 27 Shandanan Road, Jinan, Shandong 250100, China;4. Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, CA 95064, USA;1. Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, PR China;2. College of Materials Science and Engineerig, Changsha University of Science and Technology, Changsha, 410114, PR China;1. School of Chemistry and Chemical Engineering, Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minzu University, Yinchuan, 750021, PR China;2. Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, PR China;3. Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan, 750021, PR China |
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| Abstract: | Designing highly efficient and durable metal-free electro-catalysts replacing the precious (non)noble metals is crucial to the future hydrogen economy and various renewable energy conversion and storage devices. Herein, we report an efficient low-cost nanoporous activated carbon sheets (NACS) with hierarchical pore architecture from Indian Ooty Varkey (IOV) food waste for oxygen evolution (OER) and hydrogen evolution reactions (HER) by following “waste to wealth creation” strategy. Characterization of NACS carbo-catalyst reveals the presence of pyridinic-nitrogen inherited by self-doping of N from the biomass with high BET surface area (1478.0 m2 g-1). As an electrocatalyst in alkaline medium, it exhibits low-onset potential (1.36 V vs. RHE), an overpotential (η10) of 0.34 V at 10.0 mA cm?2 with a small Tafel value (43 mV dec?1), and good stability towards OER compared to Pt or Ir commercial catalysts. Tested as HER catalyst, it displays an impressive HER activity with a low-onset potential of ?0.085 V (vs. RHE), and overpotential (η10) of 0.38 V at 10.0 mA cm?2 with a small Tafel slope of 85 mV dec?1. |
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| Keywords: | Biomass-derived carbon Electrocatalysts Nanoporous carbon sheets OER HER Water splitting |
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