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Han, Xiaotong; Li, Nannan; Jung, Hyun; Kang, Yingbo; Dou, Qingyun; Liu, Qing; Lee, Jin Yong; Park, Ho Seok

doi:10.1002/inf2.12254

Cited by 10 publications

(17 citation statements)

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“…To further demonstrate its potential in practical batteries, we also tested its performance in solid-state batteries. [50] The corresponding results are shown in Supporting Information (Figure S11, Supporting Information).…”

Section: Electrochemical Testsmentioning

confidence: 99%

Eight‐Component Nanoporous High‐Entropy Oxides with Low Ru Contents as High‐Performance Bifunctional Catalysts in Zn‐Air Batteries

Jin

Lyu

et al. 2022

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One major challenge in heterogeneous catalysis is to reduce the usage of noble metals while maintaining the overall catalytic stability and efficiency in various chemical environments. In this work, a series of high‐entropy catalysts are synthesized by a chemical dealloying method and find the increased entropy effect and non‐noble metal contents would facilitate the formation of complete oxides with low crystallinity. Importantly, an optimal eight‐component high‐entropy oxide (HEO, Al‐Ni‐Co‐Ru‐Mo‐Cr‐Fe‐Ti) is identified, which exhibits further enhanced catalytic activity for the oxygen evolution reaction (OER) as compared to the previously reported quinary AlNiCoRuMo and the widely‐used commercial RuO2 catalysts, and at the same time similar catalytic activity for the oxygen reduction reaction (ORR) as the commercial Pt/C with a half‐wave potential of 0.87 V. Such high‐performance bi‐functional catalysts, however, only require a half loading amount of Ru as compared to the quinary AlNiCoRuMo, due to the underlying Cr‐Fe synergistic effects on tuning the electronic structures at active surface sites, as revealed by the first‐principles density functional theory calculations of the authors. The eight‐component HEO also demonstrates excellent stability under continuous electrochemical working conditions, suitable for a wide range of applications such as metal‐air batteries.

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Section: Electrochemical Testsmentioning

confidence: 99%

Eight‐Component Nanoporous High‐Entropy Oxides with Low Ru Contents as High‐Performance Bifunctional Catalysts in Zn‐Air Batteries

Jin

Lyu

et al. 2022

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“…The MX@C delivered upgraded HER performance in 1.0 m KOH electrolyte, as shown in Figure 4g. Afterward, the Park group [50] [48] Copyright 2018, American Chemical Society. f) Schematic of the procedure to synthesize MX@C nanodot hybrids.…”

Section: Active Edgesmentioning

confidence: 99%

MXene Nanoarchitectonics: Defect‐Engineered 2D MXenes towards Enhanced Electrochemical Water Splitting

Tang

Yang

et al. 2022

Advanced Energy Materials

168

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catalysts are currently widely utilized as the best performing HER and OER catalysts, respectively. But their high cost and scarcity seriously hinders their extensive implementation. Therefore, developing cost-effective alternatives and studying the electrocatalytic mechanisms of HER and OER catalysts is of practical significance and is economically desirable.2D transition metal (TM) carbides and nitrides, well-defined MXenes, constitute a thriving layered material family. MXenes are typically synthesized by extracting the "A" layers (A = Si, Al, Ga, etc.) from layered MAX (M n+1 AX n ) precursors. Generally, MXenes are described using the chemical formula M n+1 X n T z , where M refers to TM elements (such as Ti, V, Cr, and Mo); X represents C and/or N; T z stands for O, OH, F, Cl, Br surface terminals; [3,4] and n = 1, 2, 3, or 4. [5,6] In 2016, Seh et al. [7] used theoretical and experimental results to demonstrate that Mo 2 CT x could be an active and stable catalyst for HER, which inspired the blooming development of MXenes-based electrocatalysts. Theoretical predictions have indicated that MXenes are promising electrocatalysts owing to their high electrical conductivity, excellent hydrophilicity, large surface areas, tunable structures, and ultralow work functions. [8][9][10] However, the catalytic activities of most pristine MXenes do not perform well because they restack easily and have poor stability in oxidating environments. It has been proven that catalytic performance 2D MXenes-based nanoarchitectures are being actively explored for electrocatalytic water splitting because they possess physical and physiochemical properties that enhance catalytic activity toward the hydrogen evolution reaction and oxygen evolution reaction. This review systematically summarizes current strategies involved in defect engineering, including introducing atomic vacancies and active edges, and doping with metal and non-metal atoms, which have been employed to achieve high-efficiency MXenes-based catalysts. The electronic structures, optimized adsorption/desorption energies of the intermediates, and possible catalytic mechanisms resulting from various defects are disclosed based on combined experimental results and theoretical calculations. Current challenges and future opportunities for the mechanistic investigation and practical application of defective MXenesbased catalysts are proposed. This report aims to reveal the nature of defective MXenes electrocatalysts and to provide valuable guidelines for designing defective MXenes-based nanoarchitectures for various catalytic reactions.

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“…Simultaneously, the active sites such as MoS 2 and Co 2 P in the composite materials using MXenes are mostly on the edge, and thus is necessary to expose more edge sites, which can be realized by vertical growth and other methods. 148 and designed a 3D layered porous composite material NiFe-LDH/MQD/NG (Fig. 7c).…”

Section: Doping Of Mxene Catalystsmentioning

confidence: 99%

Recent developments of MXene-based catalysts for hydrogen production by water splitting

et al. 2023

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Abstract: Electronically coupled metallic hybrids of layered double hydroxide nanosheets/MXene quantum dots are designed for high‐performance flexible Zn‐air batteries. (DOI: 10.1002/inf2.12226) image

Cited by 10 publications

References 0 publications

Eight‐Component Nanoporous High‐Entropy Oxides with Low Ru Contents as High‐Performance Bifunctional Catalysts in Zn‐Air Batteries

Eight‐Component Nanoporous High‐Entropy Oxides with Low Ru Contents as High‐Performance Bifunctional Catalysts in Zn‐Air Batteries

MXene Nanoarchitectonics: Defect‐Engineered 2D MXenes towards Enhanced Electrochemical Water Splitting

Recent developments of MXene-based catalysts for hydrogen production by water splitting

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