Doping of Fe on room-temperature-synthesized CoNi layered double hydroxide as an excellent bifunctional catalyst in alka
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ORIGINAL PAPER
Doping of Fe on room‑temperature‑synthesized CoNi layered double hydroxide as an excellent bifunctional catalyst in alkaline media Anand Parkash1,2 Received: 14 April 2020 / Accepted: 1 June 2020 © Iranian Chemical Society 2020
Abstract Currently, the high demand for energy results in a large amount of pollution, which is of great concern. To overcome this problem, a highly active and low-cost bifunctional electrocatalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial to satisfy industrial criteria. Layered double hydroxides (LDH) attracted significant interest in several fields, including catalysis, storage of energy, delivery of druges, etc. A simple coprecipitation method for the preparation of highly active electrochemical Fex/CoNi LDH catalysts at room temperature was described here. In alkaline media, from series of prepared catalysts, the F e8%/Co–Ni LDH shows superior electrocatalytic activity with an overpotential of 232 mV at 10 mA/cm2, and Eo 91 V and E1/2 0.83 V versus RHE comparable to both noble metal-based and noble-metalfree OER/ORR catalysts recorded. Proper electronic structure and charging resistance that can facilitate the reduction of electron movement in the ORR/OER, are considered as two main factors in reducing the over-potential catalytic reaction. Graphic abstract
Keywords Fuel cell · Non-noble metal · Layered double hydroxide · OER · ORR Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13738-020-01970-7) contains supplementary material, which is available to authorized users. * Anand Parkash [email protected] Extended author information available on the last page of the article
Introduction The increasing demand for energy and environmental solutions has prompted extensive studies into energy storage systems and methods of conversion, such as metal-air batteries, water decomposition, carbon dioxide capture, fuel cells
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Journal of the Iranian Chemical Society
[1–5]. Electrochemical reactions, such as oxygen evolution reaction (OER), oxygen reduction reaction (ORR), hydrogen reduction reaction (HER), and CO2 reduction, are the basic steps of these approaches [6–10]. Platinum group metals (PGMs) are active electrocatalysts, but their scarcity and high cost restrict their use in the energy conversion industry [11–13]. Therefore, there is an urgent need to research high-performance and low-cost nonplatinum group metal electrocatalysts [14–16]. The production of appropriate and economic catalysts with high activity, such as non-noble metals/metal oxides and carbon-based materials, is, therefore, of great importance [17–19]. Both specifications can be met using layered double hydroxides (LDH), instead of the traditional anode and cathode materials used in energy systems [20–22]. LDHs are a class of natural and synthetic compounds, and the general formula is [M(II)1−xM(III)x(OH)2](yn−)x/n-yH2O, in which M(II) and M(III), respectively, represent divalent an
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