Fe-doped NiO mesoporous nanosheets array for highly efficient overall water splitting

Wu, Zhengcui; Zou, Zexian; Huang, Jiansong; Gao, Feng

doi:10.1016/j.jcat.2017.12.020

Cited by 212 publications

(93 citation statements)

References 42 publications

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“…It perhaps because of the presence of ‘Fe’ dopant, higher oxidation state of Ni 2+ (NiOOH) is stabilized leading to shift in Ni−O stretching towards higher wavenumber. Observed result is in accordance with the existing literature . Figure S1b shows the FT‐IR spectra of the Ni(OH) 2 /NiOOH and Fe 0.06 Ni 0.94 (OH) 2 /NiOOH nanosheets show peaks at 655 and 485 cm −1 are assigned to the in‐plane Ni−O−H bending and Ni−O stretching vibration frequencies, respectively.…”

Section: Resultssupporting

confidence: 90%

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Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

2019

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Designing metal hydroxide electrocatalysts with high efficiency to overcome the slow reaction kinetics of the oxygen evolution reaction (OER) is considered as a significant approach for renewable energy resources. We report here a simple methodology to synthesize 2D thin nickel hydroxide/nickel oxyhydroxide sheets that show efficient activity towards OER. Further, by doping with a heteroatom, Fe, thinner sheets of nickel hydroxide/nickel oxyhydroxide are developed, which exhibit enhanced electrocatalytic activity towards OER with high durability. Fe‐doped Ni(OH)2/NiOOH requires only 200 mV overpotential to produce 10 mA/cm2, whereas bare Ni(OH)2/NiOOH needs 290 mV overpotential. Moreover, Fe‐doped nickel hydroxide/nickel oxyhydroxide shows a minimal Tafel value of 48 mV/decade, which is even lower than RuO2/CC (82 mV/decade). X‐ray photoelectron spectroscopy indicates that in the case of Fe‐doped Ni(OH)2/NiOOH, the Ni3+ signal enhances, which indicates the favourable stabilization of Ni3+ in the presence of Fe3+ dopant. Under electrochemical OER conditions, in Fe‐doped Ni(OH)2/NiOOH, Fe3+ species help to generate more Ni3+, which function as the active species. Fe0.06Ni0.94(OH)2/NiOOH shows long‐term stability for at least 24 hours in alkaline medium. This work unveils a green strategy for Fe‐doping in 2D thin sheets of Ni(OH)2/NiOOH, which show improved electrocatalytic activity compared to bare Ni(OH)2/NiOOH. The mechanism of OER activity enhancement after Fe‐doping is proposed here.

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Section: Resultssupporting

confidence: 90%

“…For anodic oxygen evolution reaction, 206 mV is needed to generate 10 mA cm −2 current density with a Tafel slope of 49.4 mV dec −1 . For cathodic hydrogen evolution reaction only a small overpotential of 88 mV is required to generate 10 mA cm −2 current density with a Tafel slope of 49.7 mV dec −1 . Xiao et al .…”

Section: Introductionmentioning

confidence: 99%

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

2019

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“…The electrocatalytic OER performances of Fe‐doped Ni 3 S 2 and undoped Ni 3 S 2 are studied by directly using them as electrodes. The voltammograms of both Fe 13.7% ‐Ni 3 S 2 and undoped Ni 3 S 2 give a pair of reversible peaks (Figure a), owing to Ni redox processes, and the oxidized peak of Fe 13.7% ‐Ni 3 S 2 positively shifts about 33 mV compared to undoped Ni 3 S 2 , suggesting the Fe doping can restrain Ni 2+ /Ni 3+ redox couple and enhance the activity of Ni cation . The area of the Ni 2+ /Ni 3+ redox peaks raises with Fe doping, demonstrating more total charge transfer.…”

Section: Resultsmentioning

confidence: 99%

Fe‐Doped Ni₃S₂ Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

Wang

Zhang

et al. 2019

ChemElectroChem

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It is critical to develop a highly effective and economical electrocatalyst to lower the energy losses for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this work, Fe‐doped Ni3S2 nanowires with diameters of ca. 17 nm and lengths of 1.4∼2 μm are synthesized on Ni foam through a one‐step solvothermal route for alkaline water splitting, which display notable active and excellent durability for both OER and HER under high current densities. The optimal Fe13.7%‐Ni3S2 nanowires electrode can attain 200 mA cm−2 at a fairly low overpotential of 223 mV, and 500 mA cm−2 at 245 mV toward OER. Furthermore, it yields a considerable low overpotential of 109 mV to garner 10 mA cm−2, and 246 mV for 500 mA cm−2 toward HER. The incorporation of iron simultaneously modifies the electronic structure and morphology of Ni3S2, which not only enhances the conductivity but also generates abundant active edge sites. The slight surface‐restricted oxidation of nanowires in a strongly basic electrolyte in situ generates a large number of interfaces, which enables the reactivity and durability for both OER and HER. Accordingly, an alkaline water electrolyzer with two Fe13.7%‐Ni3S2 electrodes only requires a low cell voltage of 1.53 V to achieve 10 mA cm−2, and 1.95 V to 500 mA cm−2 with striking stability. The as‐prepared Fe‐doped Ni3S2 nanowires can be potentially utilized for actual water electrolysis under high current densities.

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“…Nickel oxides are good candidates for the OER [62][63][64][65] because these catalysts are resistant to corrosion in alkaline media. In addition, enhancements in the performance of these catalysts can be made by changing their particle size, surface area and microstructure, which motivated researchers to discover new methods to enhance electrocatalytic OER activities as well.…”

Section: Nickel Oxidesmentioning

confidence: 99%

“…These materials are referred to by researchers as spinel oxides and can demonstrate superior performances as OER catalysts. And of these spinel oxides, the effects of synthesis routes and calcination temperatures have been extensively studied for NiCo 2 O 4 [65][66][67][68][69][70][71][72][73][74][75][76], in which several synthesis methods, including coprecipitation by using NaOH, thermal decomposition of hydroxides, microemulsion, and sol-gel, have been evaluated. Here, it was found that optimal catalytic performances can be obtained from catalysts obtained through the coprecipitation method under an optimal temperature of 325 °C.…”

Section: Nickel Oxidesmentioning

confidence: 99%

Recent Progresses in Electrocatalysts for Water Electrolysis

Khan

Zhao

Zou

et al. 2018

Electrochem. Energ. Rev.

360

178

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The study of hydrogen evolution reaction and oxygen evolution reaction electrocatalysts for water electrolysis is a developing field in which noble metal-based materials are commonly used. However, the associated high cost and low abundance of noble metals limit their practical application. Non-noble metal catalysts, aside from being inexpensive, highly abundant and environmental friendly, can possess high electrical conductivity, good structural tunability and comparable electrocatalytic performances to state-of-the-art noble metals, particularly in alkaline media, making them desirable candidates to reduce or replace noble metals as promising electrocatalysts for water electrolysis. This article will review and provide an overview of the fundamental knowledge related to water electrolysis with a focus on the development and progress of non-noble metal-based electrocatalysts in alkaline, polymer exchange membrane and solid oxide electrolysis. A critical analysis of the various catalysts currently available is also provided with discussions on current challenges and future perspectives. In addition, to facilitate future research and development, several possible research directions to overcome these challenges are provided in this article.

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Fe-doped NiO mesoporous nanosheets array for highly efficient overall water splitting

Cited by 212 publications

References 42 publications

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Fe‐Doped Ni₃S₂ Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

Recent Progresses in Electrocatalysts for Water Electrolysis

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Fe-doped NiO mesoporous nanosheets array for highly efficient overall water splitting

Cited by 212 publications

References 42 publications

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Fe‐Doped Ni3S2 Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

Recent Progresses in Electrocatalysts for Water Electrolysis

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Fe‐Doped Ni₃S₂ Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting