Journal
MATERIALS TODAY ENERGY
Volume 19, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2020.100575
Keywords
Oxygen evolution reaction; Hydrogen evolution reaction; Corrosion resistance; Seawater like solution; Long-time stability
Funding
- 'High Entropy Materials Center' from The Featured Areas Research Center Program within Ministry of Education (MOE)
- TOF-SIMS Lab from National Tsing Hua University
- Project MOST (Ministry of Science and Technology), Taiwan [MOST 106-2221-E-008-106-MY3, MOST 1092634-F-007-024]
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A novel anode catalyst using an advanced composite material exhibited excellent stability and activity in a seawater-like electrolyte. The lifespan of the foam electrode was extended from 80 h to 250 h, and the Tafel slope significantly decreased, which is crucial for improving water splitting efficiency.
The oxygen evolution reaction (OER) is the half reaction in the overall reaction of electrocatalytic water splitting, and it involves four electron transfers. The aforementioned electron requirement implies that the OER requires more energy than the HER, thus limiting the overall water splitting efficiency. Here, we propose a novel anode catalyst by using an advanced composite material of selenized nickel-iron electrodes together with NiFe_LDH. An analysis of the water splitting performance was carried out in different concentrations of a seawater-like electrolyte, which, in terms of corrosion reactions, is a relatively harsher environment than that found in natural seawater. In this study, we discovered that a Se_NiFe foam electrode with an LDH layer exhibited extraordinary stability and activity in an aqueous sea-like solution, demonstrating an improved overpotential from the original 1.62 V-1.43 V in a seawater electrolyte mixture. Furthermore, the Tafel slope significantly decreased from 115.1 mV dec(-1) to 26.3 mV dec(-1). Notably, the lifespan of this novel electrode was extended from 80 h to 250 h. The mechanism of improved stability and corrosion resistance is also investigated in this study. (C) 2020 Elsevier Ltd. All rights reserved.
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