Topotactically constructed nickel–iron (oxy)hydroxide with abundant in-situ produced high-valent iron species for efficient water oxidation

Kuang, Zhichong; Liu, Song; Li, Xuning; Wang, Meng; Ren, Xinyi; Ding, Jie; Ge, Rile; Zhou, Wenhui; Rykov, Alexandre I.; Sougrati, Moulay Tahar; Lippens, P.E.; Huang, Yanqiang; Wang, Junhu

doi:10.1016/j.jechem.2020.09.014

Cited by 52 publications

(30 citation statements)

References 46 publications

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“…Previously, we asserted that high-oxidation (high-ox) iron sites are the most likely to be active, whereas nickel by itself has been erroneously identified as an active catalyst material . Since then, there has been a clear shift in focus toward high-ox iron, − but there remain nickel loyalists [and low-oxidation (low-ox) iron enthusiasts] in the community. Here, we consider some of the characteristics that would be required of nickel active sites to be competent for electrocatalytic water oxidation.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Nickel–Iron Water Oxidation Electrocatalysts

2021

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Hotly debated these days is whether nickel or iron is the active site in nickel–iron water oxidation electrocatalysts. We have previously argued that iron is a likely candidate for highly active materials because it can reach high-oxidation (high-ox) states at potentials relevant to water splitting. Here, we further assert that nickel is likely not an active site for water oxidation electrocatalysis in these materials. Our 3-fold argument is supported by electrochemical measurements on rigorously planar electrodes produced by pulsed laser ablation in liquids: (1) nickel cannot achieve high-ox states in aqueous environments at relevant potentials; (2) large steady-state concentrations of metal sites preclude them from being active, thereby indicating that even more oxidizing moieties are critically important; and (3) unlike nickel sites, high-ox iron sites documented experimentally are neither rare nor unreasonably reactive.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Nickel–Iron Water Oxidation Electrocatalysts

2021

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“…They proposed that such CoS 2 -like clusters are generated in cathodic polarisation, thereby exposing a high density of catalytically active sulphur sites for enhanced HER. Other studies using Raman spectroscopy soon followed, 1768, [1784][1785][1786][1787][1788][1789][1790] demonstrating its clear interest to unveil catalysts' structural changes upon operation, elucidate their possible active sites and the intermediates formed during (water) electrolysis.…”

Section: Physicochemical Techniques Coupled To Electrochemistry To Un...mentioning

confidence: 99%

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

et al. 2022

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“…Considerable efforts have been constructed in the field of TM-(oxy)hydroxides (OOH) to produce highly efficient and stable electrocatalysts [177][178][179][180][181][182][183][184]. TM-OOH are constructed by layered-stacking TMO 6 octahedrons with protons sandwiching between layers, and the different 1 3 intercalating species can alter the layer spacing.…”

Section: (Oxy)hydroxidesmentioning

confidence: 99%

Shining Light on Anion-Mixed Nanocatalysts for Efficient Water Electrolysis: Fundamentals, Progress, and Perspectives

et al. 2022

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Highlights This review introduces recent advances of various anion-mixed transition metal compounds (e.g., nitrides, halides, phosphides, chalcogenides, (oxy)hydroxides, and borides) for efficient water electrolysis applications in detail. The challenges and future perspectives are proposed and analyzed for the anion-mixed water dissociation catalysts, including polyanion-mixed and metal-free catalyst, progressive synthesis strategies, advanced in situ characterizations, and atomic level structure–activity relationship. Abstract Hydrogen with high energy density and zero carbon emission is widely acknowledged as the most promising candidate toward world's carbon neutrality and future sustainable eco-society. Water-splitting is a constructive technology for unpolluted and high-purity H2 production, and a series of non-precious electrocatalysts have been developed over the past decade. To further improve the catalytic activities, metal doping is always adopted to modulate the 3d-electronic configuration and electron-donating/accepting (e-DA) properties, while for anion doping, the electronegativity variations among different non-metal elements would also bring some potential in the modulations of e-DA and metal valence for tuning the performances. In this review, we summarize the recent developments of the many different anion-mixed transition metal compounds (e.g., nitrides, halides, phosphides, chalcogenides, oxyhydroxides, and borides/borates) for efficient water electrolysis applications. First, we have introduced the general information of water-splitting and the description of anion-mixed electrocatalysts and highlighted their complementary functions of mixed anions. Furthermore, some latest advances of anion-mixed compounds are also categorized for hydrogen and oxygen evolution electrocatalysis. The rationales behind their enhanced electrochemical performances are discussed. Last but not least, the challenges and future perspectives are briefly proposed for the anion-mixed water dissociation catalysts.

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Topotactically constructed nickel–iron (oxy)hydroxide with abundant in-situ produced high-valent iron species for efficient water oxidation

Cited by 52 publications

References 46 publications

Mechanism of Nickel–Iron Water Oxidation Electrocatalysts

Mechanism of Nickel–Iron Water Oxidation Electrocatalysts

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

Shining Light on Anion-Mixed Nanocatalysts for Efficient Water Electrolysis: Fundamentals, Progress, and Perspectives

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