High-entropy alloys for water oxidation: a new class of electrocatalysts to look out for

Nandan, Ravi; Rekha, M.Y.; Devi, Hemam Rachna; Srivastava, Chandan

doi:10.1039/d0cc06485h

Cited by 49 publications

(36 citation statements)

References 26 publications

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“…[ 4‐5 ] Despite numerous research efforts and great progresses, most non‐precious metal based electrocatalysts are still inferior to the state‐of‐art precious metals. [ 6‐9 ] Therefore, it is highly desired to search for inexpensive and efficient electrocatalysts for renewable energy conversions.…”

Section: Introductionmentioning

confidence: 99%

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

Yang

Jiang

et al. 2021

Chin. J. Chem.

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Despite progress over the past few years in developing efficient low‐cost catalysts, precious metals are still the best catalysts for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). However, the natural scarcity and high cost greatly hamper their large‐scale commercialization. The combination of graphene shell with metal core could tune the electronic structure of carbon active sites. Recently, nitrogen doped graphene encapsulated metal or alloy (M@NG) has emerged as novel and fascinating electrocatalysts. In this review, we focus on some recent advances in designing M@NG electrocatalysts for HER, OER and ORR through tuning electronic structure and activity of carbon active sites. We have summarized some facile and universal strategy for synthesizing various M@NG via direct annealing of metal‐organic frameworks (MOFs). With elaborated MOFs precursor design, careful control over the nitrogen doping level, metal element types and alloy structure, the electronic structure of carbon active sites can be rationally tuned to optimize activity for different electrochemical reactions. We hope this review can provide new insights into the design of M@NG with high catalytic activity.

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Section: Introductionmentioning

confidence: 99%

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

Yang

Jiang

et al. 2021

Chin. J. Chem.

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“…Designing efficient photoanodes has gained enormous attention as oxygen evolution is a complex reaction due to the four‐electron transfer process. [ 1–3 ] Hematite has been widely investigated as a photoanode material because of its abundance in nature, chemical stability, suitable bandgap (2.1 eV) to absorb solar radiations, [ 4 ] suitable valence band edge position for water oxidation reaction, [ 5 ] and non‐toxicity. Hematite also possesses a high theoretical solar‐to‐hydrogen conversion efficiency of 15%.…”

Section: Introductionmentioning

confidence: 99%

Insights into Improving Photoelectrochemical Water‐Splitting Performance Using Hematite Anode

et al. 2021

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Designing an efficient photoanode is of great importance for photoassisted solar water splitting. Herein, a series of modifications to a nanorod structure hematite, to be used as anode for photoelectrochemical (PEC) water-splitting reactions is designed. Ti doping, oxygen vacancy formation by N 2 treatment, TiO 2 passivation, and FeOOH cocatalyst decoration are explored for their roles and contributions to the improvement of the PEC water oxidation performance. It is found that Ti doping and N 2 treatment can greatly increase the charge carrier density, which has boosted the photocurrent. TiO 2 passivation enhances the photovoltage, resulting in a cathodic shift in the onset potential (%170 mV with respect to prepassivation). Further, the FeOOH cocatalyst decoration improves the reaction kinetics, thereby improving the overall photoassisted water oxidation performance.

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“…Based on Equations () and (), the mixed configuration entropy rises accordingly, which leads to the formation of a stable single‐phase solid solution structure by lowering the corresponding free energy at higher temperature, and contributes to the superior stability of HEAs and HECs 7,60 . Moreover, the elevation of the mixed configuration entropy has the capability of overcoming the miscibility barrier among elemental components in HEAs and HECs, which is beneficial to the regulation of elemental concentrations and the optimization of electrocatalytic properties 61 The lattice distortion effect is attributed to the large difference in the sizes of accommodated atoms of the elemental components in HEAs or HECs.…”

Section: Fundamentals Of Heas and Hecsmentioning

confidence: 99%

High‐entropy alloys and compounds for electrocatalytic energy conversion applications

Liu

Lenus

Zhang

et al. 2021

SusMat

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High‐entropy materials, composed of five or more elements in near‐equiatomic percentage, have been attracting tremendous interests due to their advantageous properties in a variety of applications. Recently, electrocatalysis on high‐entropy alloys (HEAs) and high‐entropy compounds (HECs) has emerged as a new and promising material owing to the tailored composition and the disordered configuration of HEAs and HECs. Though extensive efforts have been devoted to investigating the catalytic nature of HEAs and HECs, the details related to the active sites and intrinsic activity of such catalysts still remain uncertain due to the complexity of the multicomponent systems. In this review, the recent progress of HEAs and HECs is systematically reviewed in terms of their synthetic strategies and electrocatalytic applications. Importantly, the computationally assisted methods (e.g., density functional theory [DFT]) are also presented to discover and design the optimum HEA‐ and HEC‐based catalysts. Subsequently, the applications of HEAs and HECs in electrocatalytic energy conversion reactions will be discussed, including hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, carbon dioxide reduction reaction, nitrogen reduction reaction, methanol oxidation reaction, and ethanol oxidation reaction (EOR). Moreover, the prospects and future opportunities for this research field are cautiously discussed. A series of upcoming challenges and questions are thoroughly proposed from the experimental and theoretical aspects as well as other future applications in electrocatalysis.

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High-entropy alloys for water oxidation: a new class of electrocatalysts to look out for

Abstract: High-entropy nanoalloys (HEA, CuCrCoFeNi) will have future uses in electrochemical water oxidation, with excellent operational stability and superior electroactivity, across a wide range of reported electrocatalysts.

Cited by 49 publications

References 26 publications

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

Insights into Improving Photoelectrochemical Water‐Splitting Performance Using Hematite Anode

High‐entropy alloys and compounds for electrocatalytic energy conversion applications

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High-entropy alloys for water oxidation: a new class of electrocatalysts to look out for

Abstract: High-entropy nanoalloys (HEA, CuCrCoFeNi) will have future uses in electrochemical water oxidation, with excellent operational stability and superior electroactivity, across a wide range of reported electrocatalysts.

Cited by 49 publications

References 26 publications

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites†

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites†

Insights into Improving Photoelectrochemical Water‐Splitting Performance Using Hematite Anode

High‐entropy alloys and compounds for electrocatalytic energy conversion applications

Contact Info

Product

Resources

About

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†

MOFs‐Derived N‐Doped Carbon‐Encapsulated Metal/Alloy Electrocatalysts to Tune the Electronic Structure and Reactivity of Carbon Active Sites^†