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      Porous Nickel–Iron Oxide as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

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          Abstract

          A porous Ni–Fe oxide with improved crystallinity has been prepared as a highly efficient electrocatalytic water oxidation catalyst. It has a small overpotential, a low Tafel slope, and an outstanding stability. The remarkably improved electrocatalytic performance is due to the porous structure, high extent homogeneous iron incorporation, ameliorative crystallinity, and the low mass transfer resistance.

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          An advanced Ni-Fe layered double hydroxide electrocatalyst for water oxidation.

          Ming Gong, Yanguang Li, Hailiang Wang … (2013)
          Highly active, durable, and cost-effective electrocatalysts for water oxidation to evolve oxygen gas hold a key to a range of renewable energy solutions, including water-splitting and rechargeable metal-air batteries. Here, we report the synthesis of ultrathin nickel-iron layered double hydroxide (NiFe-LDH) nanoplates on mildly oxidized multiwalled carbon nanotubes (CNTs). Incorporation of Fe into the nickel hydroxide induced the formation of NiFe-LDH. The crystalline NiFe-LDH phase in nanoplate form is found to be highly active for oxygen evolution reaction in alkaline solutions. For NiFe-LDH grown on a network of CNTs, the resulting NiFe-LDH/CNT complex exhibits higher electrocatalytic activity and stability for oxygen evolution than commercial precious metal Ir catalysts.
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            Efficient water oxidation using nanostructured α-nickel-hydroxide as an electrocatalyst.

            Minrui Gao, Wenchao Sheng, Zhongbin Zhuang … (2014)
            Electrochemical water splitting is a clean technology that can store the intermittent renewable wind and solar energy in H2 fuels. However, large-scale H2 production is greatly hindered by the sluggish oxygen evolution reaction (OER) kinetics at the anode of a water electrolyzer. Although many OER electrocatalysts have been developed to negotiate this difficult reaction, substantial progresses in the design of cheap, robust, and efficient catalysts are still required and have been considered a huge challenge. Herein, we report the simple synthesis and use of α-Ni(OH)2 nanocrystals as a remarkably active and stable OER catalyst in alkaline media. We found the highly nanostructured α-Ni(OH)2 catalyst afforded a current density of 10 mA cm(-2) at a small overpotential of a mere 0.331 V and a small Tafel slope of ~42 mV/decade, comparing favorably with the state-of-the-art RuO2 catalyst. This α-Ni(OH)2 catalyst also presents outstanding durability under harsh OER cycling conditions, and its stability is much better than that of RuO2. Additionally, by comparing the performance of α-Ni(OH)2 with two kinds of β-Ni(OH)2, all synthesized in the same system, we experimentally demonstrate that α-Ni(OH)2 effects more efficient OER catalysis. These results suggest the possibility for the development of effective and robust OER electrocatalysts by using cheap and easily prepared α-Ni(OH)2 to replace the expensive commercial catalysts such as RuO2 or IrO2.
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              Water oxidation catalysis: electrocatalytic response to metal stoichiometry in amorphous metal oxide films containing iron, cobalt, and nickel.

              Rodney D L Smith, Mathieu S. Prévot, Randal Fagan … (2013)
              Photochemical metal-organic deposition (PMOD) was used to prepare amorphous metal oxide films containing specific concentrations of iron, cobalt, and nickel to study how metal composition affects heterogeneous electrocatalytic water oxidation. Characterization of the films by energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed excellent stoichiometric control of each of the 21 complex metal oxide films investigated. In studying the electrochemical oxidation of water catalyzed by the respective films, it was found that small concentrations of iron produced a significant improvement in Tafel slopes and that cobalt or nickel were critical in lowering the voltage at which catalysis commences. The best catalytic parameters of the series were obtained for the film of composition a-Fe20Ni80. An extrapolation of the electrochemical and XPS data indicates the optimal behavior of this binary film to be a manifestation of iron stabilizing nickel in a higher oxidation level. This work represents the first mechanistic study of amorphous phases of binary and ternary metal oxides for use as water oxidation catalysts, and provides the foundation for the broad exploration of other mixed-metal oxide combinations.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Adv Sci (Weinh)
                Journal ID (iso-abbrev): Adv Sci (Weinh)
                Journal ID (doi): 10.1002/(ISSN)2198-3844
                Journal ID (publisher-id): ADVS
                Title: Advanced Science
                Publisher: John Wiley and Sons Inc. (Hoboken )
                ISSN (Electronic): 2198-3844
                Publication date (Electronic): 10 September 2015
                Publication date Collection: October 2015
                Volume: 2
                Issue: 10 ( doiID: 10.1002/advs.v2.10 )
                Electronic Location Identifier: 1500199
                Affiliations
                [ 1 ] School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119P.R. China
                [ 2 ] Department of ChemistryRenmin University of China Beijing 100872P.R. China
                Author notes
                Article
                Publisher ID: ADVS201500199
                DOI: 10.1002/advs.201500199
                PMC ID: 5049451
                SO-VID: 927cec4b-b205-48f6-ae49-ee2e509bc2d9
                Copyright © © 2015 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
                License:

                This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 09 June 2015
                Date revision received : 30 July 2015
                Page count
                Pages: 8
                Funding
                Funded by: National Natural Science Foundation of China
                Award ID: 21101170
                Categories
                Subject: Communication
                Subject: Communications
                Custom metadata
                source-schema-version-number 2.0
                component-id advs201500199
                cover-date October 2015
                details-of-publishers-convertor Converter:WILEY_ML3GV2_TO_NLMPMC version:4.9.4 mode:remove_FC converted:04.10.2016

                Keywords: electrocatalysis,iron,nickel,oxygen evolution,water splitting
                Data availability:
                Keywords: electrocatalysis, iron, nickel, oxygen evolution, water splitting

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