Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 36, Pages 19995-20006Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.06.016
Keywords
Biomass-derived carbon; Electrocatalysts; Nanoporous carbon sheets; OER; HER; Water splitting
Categories
Funding
- Ministry of New and Renewable Energy (MNRE), Govt. of India [31/03/2014-15/PVSE-RD]
- CSIR
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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 NAGS carbo-catalyst reveals the presence of pyridinic-nitrogen inherited by self-doping of N from the biomass with high BET surface area (1478.0 m(2) g(-1)). As an electrocatalyst in alkaline medium, it exhibits low-onset potential (1.36 V us. RHE), an overpotential (1110) 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 (eta(10)) of 0.38 V at 10.0 mA cm(-2) with a small Tafel slope of 85 mV dec(-1). (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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