Preparation, electrical and electrochemical characterizations of CuCoNiFeMn high-entropy-alloy for overall water splitting at neutral-pH

Sivanantham, Arumugam; Lee, Hansung; Hwang, Sung Won; Ahn, Byungmin; Cho, In Sun

doi:10.1039/d1ta02621f

Cited by 62 publications

(49 citation statements)

References 70 publications

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“…63 The Mn 2p 3/2 and Mn 2p 1/2 orbital modes are located at 640.95 and 652.86 eV, respectively, which can be divided into Mn 2+ (640.66/652.16 eV) and Mn 3+ (641.96/ 653.46 eV) (Figure 5c), respectively. 64,65 The Ni XPS spectrum of Co 0.6 (VMnNiZn) 0.4 PS 3 NSs displays two spin−orbit doublets and two shakeup satellites, 66,67 including a Ni 2+ doublet at 854.36 (Ni 2p 3/2 ) and 871.86 (Ni 2p 1/2 ) eV 68 and a Ni 3+ doublet at 855.76 (Ni 2p 3/2 ) and 873.86 (Ni 2p 1/2 ) eV (Figure 5c). 69 In contrast, the Zn XPS spectrum in ZnPS 3 presents only one pair of spin−orbit doublets at 1022.06 (2p 3/2 ) and 1045.06 (2p 1/2 ) eV without a shakeup satellite (Figure 5e), which is attributed to Zn 2 + .…”

Section: Resultsmentioning

confidence: 99%

Two-Dimensional High-Entropy Metal Phosphorus Trichalcogenides for Enhanced Hydrogen Evolution Reaction

et al. 2022

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Developing earth-abundant and highly effective electrocatalysts for hydrogen evolution reaction (HER) is a prerequisite for the upcoming hydrogen energy society. Two-dimensional (2D) high-entropy metal phosphorus trichalcogenides (MPCh3) have the advantages of both near-continuous adsorption energies of high-entropy alloys (HEAs) and large specific surface area of 2D materials, which are excellent catalytic platforms. As a typical 2D high-entropy catalyst, Co0.6(VMnNiZn)0.4PS3 nanosheets with high-concentration active sites are successfully demonstrated to show enhanced HER performance: an overpotential of 65.9 mV at a current density of 10 mA cm–2 and a Tafel slope of 65.5 mV dec–1. Decent spectroscopy characterizations are combined with density function theory analyses to show the scenario for the enhancement mechanism by a high-entropy strategy. The optimized S sites on the edge and P sites on the basal plane provide more active sites for hydrogen adsorption, and the introduced Mn sites boost water dissociation during the Volmer step. Two-dimensional high-entropy MPCh3 provides an avenue for the combination of HEAs and 2D materials to enhance the HER performance, which also provides an alternative materials platform to explore and design superior catalysts for various electrochemical systems.

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Section: Resultsmentioning

confidence: 99%

Two-Dimensional High-Entropy Metal Phosphorus Trichalcogenides for Enhanced Hydrogen Evolution Reaction

et al. 2022

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“…[11] Last but not least, Cho developed CuCoNiFeMn HEA electrocatalyst that manifested promising water-splitting performance in a neutral electrolyte, as shown in Figure 13c. [197] In short, the bifunctional HEM electrocatalyst is expected to tackle the higher overpotential of commercial water Figure 13. a) The potential for acidic overall water-spitting catalysts at 10 mA•cm −2 .…”

Section: Oermentioning

confidence: 99%

High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting

Zhai

Ren

Wang

et al. 2022

Adv Funct Materials

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High‐entropy materials (HEMs) have been in the spotlight as emerging catalysts for electrochemical water splitting. In particular, HEM catalysts feature multi‐element active sites and unsaturated coordination as well as entropy stabilization in comparison with their single‐element counterparts. Herein, a comprehensive overview of HEM catalysts used in electrochemical water splitting is provided, covering both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Particularly, the review begins with discussions of the concept and structure of HEMs. In addition, effective strategies for rationally designing HEMs on the basis of computational techniques and experimental aspects is described. Importantly, the importance of computationally aided methods, that is, density functional theory calculations, high‐throughput screening, and machine learning, to the discovery and design of HEMs, is described. Furthermore, the applications of HEMs in the field of water electrolysis are reviewed. Eventually, an outlook regarding the prospects and future opportunities for HEMs is provided.

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“…Vast non-noble metal-based materials, especially Fe/Co/Ni-based electrodes, have been studied as highly efficient electrocatalysts for overall water splitting, due to their low price, abundance, and relatively high catalytic performance. 20–28 However, the catalytic performances of transition metals are low and cannot meet industrial requirements. 19,29–35 Hence, transition metal derivatives were further investigated to improve the HER/OER performance, such as sulfides/selenides, 36–40 phosphides, 41–45 nitrides, 46–49 borides, 50–52 carbides, 53–55 oxides/(oxy)hydroxides, 56–62 and/or their hybrids.…”

Section: Introductionmentioning

confidence: 99%

Recent progress on bulk Fe-based alloys for industrial alkaline water electrolysis

et al. 2023

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Preparation, electrical and electrochemical characterizations of CuCoNiFeMn high-entropy-alloy for overall water splitting at neutral-pH

Abstract: High entropy alloys (HEA), the multicomponent (5 or more) alloys with an equiatomic or a near equiatomic composition, provide a unique platform to engineer surface composition and active sites for...

Cited by 62 publications

References 70 publications

Two-Dimensional High-Entropy Metal Phosphorus Trichalcogenides for Enhanced Hydrogen Evolution Reaction

Two-Dimensional High-Entropy Metal Phosphorus Trichalcogenides for Enhanced Hydrogen Evolution Reaction

High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting

Recent progress on bulk Fe-based alloys for industrial alkaline water electrolysis

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