Anion Etching for Accessing Rapid and Deep Self-Reconstruction of Precatalysts for Water Oxidation

Wang, Yang; Zhu, Yinlong; Zhao, Shenlong; She, Sixuan; Zhang, Feifei; Chen, Yu; Williams, T.; Gengenbach, Thomas R.; Zu, Lianhai; Mao, Haiyan; Zhou, Wei; Wang, Huanting; Tang, Jing; Zhao, Dongyuan; Selomulya, Cordelia

doi:10.1016/j.matt.2020.09.016

Cited by 211 publications

(145 citation statements)

References 60 publications

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“…It should be noted that although some of the examples given are about partial reconstruction, if complete reconstruction can be achieved, the reconstructed species can inherit and exhibit properties which are similar to those in the surface reconstruction. 1)Low‐/polycrystalline or amorphous structure, which is accompanied by abundant vacancies/defects, active sites, or unsaturated metal atom coordination. [ 17,25,26,40–42 ] For example, our group identified the thermal induced complete reconstruction (TICR) mechanism on NiMoO 4 precatalyst. [ 24 ] The completely reconstructed (oxy)hydroxide showed polycrystalline characteristics, accompanied by numerous grain boundaries and vacancies, which were beneficial for high‐efficiency OER catalysis.…”

Section: Complete Reconstruction: Fundamental Understandings Advantages and Design Principlesmentioning

confidence: 99%

“…Leaching of these species will probably form the loose reconstruction layer, and thus promote the effective diffusion of electrolyte and further electro‐oxidation. [ 25,42 ] 3) Operation under extreme test conditions, here mainly includes the operation temperature, solution concentration, higher oxidation potentials, and operation time, which enables deeper reconstruction as much as possible. [ 24,48 ] To sum up, realizing effective mass transport or developing strategies to trigger chain reconstruction are supposed to achieve complete reconstruction, and the strategies are summarized in Section 3.4.…”

Section: Complete Reconstruction: Fundamental Understandings Advantages and Design Principlesmentioning

confidence: 99%

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Comprehensive Understandings into Complete Reconstruction of Precatalysts: Synthesis, Applications, and Characterizations

et al. 2021

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Reconstruction induced by external environment (such as applied voltage bias and test electrolytes) changes catalyst component and catalytic behaviors. Investigations of complete reconstruction in energy conversion recently receive intensive attention, which promote the targeted design of top‐performance materials with maximum component utilization and good stability. However, the advantages of complete reconstruction, its design strategies, and extensive applications have not achieved the profound understandings and summaries it deserves. Here, this review systematically summarizes several important advances in complete reconstruction for the first time, which includes 1) fundamental understandings of complete reconstruction, the characteristics and advantages of completely reconstructed catalysts, and their design principles, 2) types of reconstruction‐involved precatalysts for oxygen evolution reaction catalysis in wide pH solution, and origins of limited reconstruction degree as well as design strategies/principles toward complete reconstruction, 3) complete reconstruction for novel material synthesis and other electrocatalysis fields, and 4) advanced in situ/operando or multiangle/level characterization techniques to capture the dynamic reconstruction processes and real catalytic contributors. Finally, the existing major challenges and unexplored/unsolved issues on studying the reconstruction chemistry are summarized, and an outlook for the further development of complete reconstruction is briefly proposed. This review will arouse the attention on complete reconstruction materials and their applications in diverse fields.

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Section: Complete Reconstruction: Fundamental Understandings Advantages and Design Principlesmentioning

confidence: 99%

Section: Complete Reconstruction: Fundamental Understandings Advantages and Design Principlesmentioning

confidence: 99%

Comprehensive Understandings into Complete Reconstruction of Precatalysts: Synthesis, Applications, and Characterizations

et al. 2021

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“…[ 22 ] To address this issue, the integration of nanostructure with interfacial engineering has been proposed as an effective strategy. [ 26–28 ] On one hand, the nanosized particles can expose more surface area than bulk ones in the electrolyte, which is conducive to a deep phase transformation during electrochemical OER process. [ 22,27,28 ] On the other hand, coupling TMOs with other definite phases can achieve the electron and/or composition interaction, which is thermodynamically favorable for the phase transformation against the OER cycle.…”

Section: Introductionmentioning

confidence: 99%

Pseudo‐Periodically Coupling NiO Lattice with CeO Lattice in Ultrathin Heteronanowire Arrays for Efficient Water Oxidation

Yang

Dai

Chen

et al. 2021

Small

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Transition metal oxides (TMOs) have been under the spotlight as promising precatalysts for electrochemical oxygen evolution reaction (OER) in alkaline media. However, the slow and incomplete self‐reconstruction from TMOs to (oxy)hydroxides as well as the formed (oxy)hydroxides with unmodified electronic structure gives rise to the inferior OER performance to the noble metal oxide ones. Herein, a unique dual metal oxides lattice coupling strategy is proposed to fabricate carbon cloth‐supported ultrathin nanowires arrays, which are composed of pseudo‐periodically welded NiO with CeO2 nanocrystals (NiO/CeO2 NW@CC). When served as an OER precatalyst in 1.0 m KOH, the NiO/CeO2 NW@CC shows an ultralow overpotential of 330 mV at 50 mA cm−2, along with an impressive cycle durability of more than 3 days even at 50 mA cm−2, surpassing CC‐supported NiO and commercial IrO2 catalysts. The combined experimental and theoretical investigations unveil that the atomic coupling of CeO2 can not only appreciably trigger the generation of oxygen vacancies and expedite phase transformation of NiO into active NiOOH, but also in situ create a chemical bond with the formed NiOOH and enable the electron injection, thus effectively inhibiting the aggregation of the accessible NiOOH nanodomains and optimizing their reaction free energy towards oxygen‐containing intermediates.

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“…The development of advanced in situ techniques has impelled the in‐depth understanding of intrinsic catalytic mechanism and real active species. [ 6 ] These in situ techniques mainly include X‐ray absorption spectroscopy, [ 7,8 ] X‐ray diffraction (XRD), [ 9 ] Raman, [ 10–12 ] transmission electron microscopy (TEM), [ 13 ] electrochemistry‐mass spectrometry, [ 14 ] and ultraviolet–visible spectroscopy (UV–vis). [ 15 ] Dynamic reconstruction processes of the catalyst have been revealed under working conditions, and the reconstructed species are commonly recognized as actual contributors in electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Ligand and Anion Co‐Leaching Induced Complete Reconstruction of Polyoxomolybdate‐Organic Complex Oxygen‐Evolving Pre‐Catalysts

Liu

Xia

Guo

et al. 2021

Adv Funct Materials

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The coordination compounds in the oxygen evolution reaction (OER) have been researched extensively. However, their poor durability (mostly < 100 h) and controversial reconstruction mechanism restrict their practical applications. Herein, a new‐type polyoxomolybdate‐organic complex (POMo) via wet‐chemistry synthesis with fixed coordination between metal centers (Ni2+ and [Mo8O26]4−) and 2‐Methylimidazole ligand is introduced. After introducing iron, a series of Fe‐doped Ni‐POMo with porous and amorphous structures are fabricated. These features accelerate the diffusion‐leaching processes of ligands and anions, resulting in rapid and complete phase reconstruction during alkaline OER. As a result, nickel‐iron (oxy)hydroxides with rich vacancies and poly‐/low‐crystalline features are in situ generated through dissolution‐redeposition, and serve as the OER‐active species. The optimized Fe0.052Ni‐POMo array pre‐catalyst has excellent activity and sustains ultrastable catalysis for 545 h. The complete reconstruction of POMo enables high catalytic durability (230 h) and stable active phase under realistic conditions (30 wt% KOH, 60.9 °C). Accordingly, the completely reconstructed catalysts with unique structures and ultrastable catalysis have the potential to be applied in industry.

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Anion Etching for Accessing Rapid and Deep Self-Reconstruction of Precatalysts for Water Oxidation

Cited by 211 publications

References 60 publications

Comprehensive Understandings into Complete Reconstruction of Precatalysts: Synthesis, Applications, and Characterizations

Comprehensive Understandings into Complete Reconstruction of Precatalysts: Synthesis, Applications, and Characterizations

Pseudo‐Periodically Coupling NiO Lattice with CeO Lattice in Ultrathin Heteronanowire Arrays for Efficient Water Oxidation

Ligand and Anion Co‐Leaching Induced Complete Reconstruction of Polyoxomolybdate‐Organic Complex Oxygen‐Evolving Pre‐Catalysts

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