Electrochemically reconstructed high-entropy amorphous FeCoNiCrVB as a highly active oxygen evolution catalyst

Zhong, Xu; Zhu, Yabo; Dai, Weiji; Yu, Jin; Lü, Tao; Pan, Ye

doi:10.1039/d2nj00984f

Cited by 9 publications

(6 citation statements)

References 40 publications

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“…[ 40,41,47 ] In addition, recent literature report showed that surface reconstruction for HEO system can happen under electrochemical activation or during OER. [ 23,57–59 ] All our synthesized HEO catalysts, regardless of their alloying order (ternary, quaternary, quinary, or senary), showed a significantly higher OER activity compared to state‐of‐the‐art commercial IrO 2 catalyst. More detailed investigations of the catalyst's stability and the mechanism behind the activity enhancement will be discussed in the following sections.…”

Section: Resultsmentioning

confidence: 94%

Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

Abdelhafiz

Wang

Harutyunyan

et al. 2022

Advanced Energy Materials

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Mixed transition‐metals (TM) based catalysts have shown huge promise for water splitting. Conventional synthesis of nanomaterials is strongly constrained by room‐temperature equilibria and Ostwald ripening. Ultra‐fast temperature cycling enables the synthesis of metastable metallic phases of high entropy alloy nanoparticles, which later transform to oxide/hydroxide nanoparticles upon use in aqueous electrolytes. Herein, an in situ synthesis of non‐noble metal high entropy oxide (HEO) catalysts on carbon fibers by rapid Joule heating and quenching is reported. Different compositions of ternary to senary (FeNiCoCrMnV) HEO nanoparticles show higher activity towards catalyzing the oxygen evolution reaction (OER) compared to a noble metal IrO2 catalyst. The synthesized HEO also show two orders of magnitude higher stability than IrO2, due to stronger carbide‐mediated intimacy with the substrate, activated through the OER process. Alloying elements Cr, Mn and V affect OER activity by promoting different oxidation states of the catalytically active TM (Fe, Ni and Co). Dissolution of less stable elements (Mn, V and Cr) leads to enhancements of OER activity. Dynamic structural and chemical perturbations of HEO oxide nanoparticles activate under OER conditions, leading to enlargement in ECSA by forming mixed single atom catalysts and ultra‐fine oxyhydroxide nanoparticles HEOs.

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Section: Resultsmentioning

confidence: 94%

Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

Abdelhafiz

Wang

Harutyunyan

et al. 2022

Advanced Energy Materials

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“…Therefore, post-OER characterisation is important to understand the dynamic changes of HEM catalysts and correlate such changes with the catalyst's stability. Zhong et al reported that upon pre-activation during OER, soluble Cr +6 and V +5 species formed in FeCoNiCrVB HEA catalysts, which led to the leach of Cr and V in the subsequent OER process [210]. In addition, for FeMnCoCrNi HEA catalysts [214], it was also reported that no Cr signal was detected by energy-dispersive spectroscopy or XPS after the OER stability test in 0.1 M KOH at 100 mA cm −2 for 60 h, indicating a remarkable compositional change upon OER.…”

Section: Post-oer Characterisation Of Hem Catalystsmentioning

confidence: 99%

High entropy materials as emerging electrocatalysts for hydrogen production through low-temperature water electrolysis

Esquius

Liu

2023

Mater. Futures

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The production of hydrogen through water electrolysis from renewable electricity is set to revolutionise the energy sector that is at present heavily dependent on fossil fuels. However, there is still a pressing need to develop advanced electrocatalysts able to show high activity and withstand industrially-relevant operating conditions for a prolonged period of time. In this regard, high entropy materials (HEMs), including high entropy alloys and high entropy oxides, comprising five or more homogeneously distributed metal components, have emerged as a new class of electrocatalysts owing to their unique properties such as low atomic diffusion, structural stability, a wide variety of adsorption energies and multi-component synergy, making them promising catalysts for challenging electrochemical reactions, including those involved in water electrolysis. This review begins with a brief overview about water electrolysis technologies and a short introduction to HEMs including their synthesis and general physicochemical properties, followed by a nearly exhaustive summary of HEMs catalysts reported so far for the hydrogen evolution reaction, the oxygen evolution reaction and the overall water splitting in both alkaline and acidic conditions. The review concludes with a brief summary and an outlook about the future development of HEM-based catalysts and further research to be done to understand the catalytic mechanism and eventually deploy HEMs in practical water electrolysers.

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“…In addition to the crystalline structure, the high-entropy concept has also seen applications in amorphous materials. [63,[67][68][69][70][71][72][73] Metallic glasses, one type of alloys with a disordered, amorphous microstructure, can provide tunable catalytic performance based on the individual properties of incorporated metals. Designing high-entropy metallic glasses may offer access to electrocatalytic properties arising from the dissimilar metal interactions.…”

Section: Other Types Of High-entropy Materialsmentioning

confidence: 99%

“…High-entropy amorphous alloys and oxides are also good candidates for the electrochemical water splitting. [70][71][72][73] High-entropy amorphous FeCoNiCrVB alloy was subject to surface reconstruction by means of cyclic voltammetry (CV) to cause selective leaching of metal elements, formation of oxyhydroxide active species, and introduction of core-shell nanoparticles, which facilitated mass/electron transfer at the catalyst interface and promoted the OER catalysis. [70] A similar electrochemical activationinduced surface reconstruction was also observed on a highentropy amorphous FeCoNiMnBO x oxide, which formed a stable oxyhydroxide surface layer that contributed greatly to the OER performance.…”

Section: Other Types Of High-entropy Materialsmentioning

confidence: 99%

High‐Entropy Materials for Water Electrolysis

2022

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Green hydrogen production by renewables‐powered water electrolysis holds the key to energy sustainability and a carbon‐neutral future. The sluggish kinetics of water‐splitting reactions, namely, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), however, remains a bottleneck to the water electrolysis technology. High‐entropy materials, due to their compositional flexibility, structural stability, and synergy between various elemental components, have recently aroused considerable interest in catalyzing the water‐splitting reactions. Herein, a timely review of the recent achievements is provided in high‐entropy materials for water electrolysis. An overview of different kinds of high‐entropy materials for catalyzing the HER and OER half‐reactions is introduced, followed by a discussion of theoretical and experimental efforts in understanding the fundamental origins of the enhanced catalytic performance observed on high‐entropy catalysts. Various materials design strategies, including control of size and shape, construction of a porous structure, engineering of defect, and formation of hybrid/composite structure, to develop high‐entropy catalysts with improved catalytic performance are highlighted. Finally, the remaining challenges are pointed out and the corresponding perspectives to address these challenges are put forward to promote the development of the research field of high‐entropy water‐splitting catalysts.

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Electrochemically reconstructed high-entropy amorphous FeCoNiCrVB as a highly active oxygen evolution catalyst

Abstract: Designing catalysts with highly electrochemical activity and stability for oxygen evolution reaction (OER) is a pivotal step for sustainable water splitting. Interface engineering can reach a practical approach to enhance...

Cited by 9 publications

References 40 publications

Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

High entropy materials as emerging electrocatalysts for hydrogen production through low-temperature water electrolysis

High‐Entropy Materials for Water Electrolysis

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