Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

Kang, Qiaoling; Laï, Dawei; Tang, Wenyin; Lu, Qingyi; Gao, Feng

doi:10.1039/d0sc06716d

Cited by 85 publications

(41 citation statements)

References 102 publications

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“…9,10 Among various alternatives, nickel-based binary alloys with iron metal (NiFe) have attracted considerable research attention during the last decades because of their numerous interesting properties. 11,12 In particular, NiFe layered double hydroxide (NiFe LDH) has been intensively investigated as electrocatalysts for water splitting due to their high catalytic activity, characteristic layered structure, and easily scale preparation. 13,14 The NiFe alloy and NiFe LDH electrodes have been prepared by various methods, such as magnetron sputtering, 15 hydrothermal treatment, 16 mechanical alloying 17 and electrodeposition technique.…”

Section: Introductionmentioning

confidence: 99%

Rational design of NiFe alloys for efficient electrochemical hydrogen evolution reaction: effects of Ni/Fe molar ratios

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Rational design of NiFe alloys for efficient electrochemical hydrogen evolution reaction: effects of Ni/Fe molar ratios

et al. 2022

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“…Poorly crystalline Ni–Fe oxides with high specific surface also deliver high geometric activity . Once subjected to the alkaline OER condition, most high-performing NiFe-based catalysts were found to involve oxyhydroxide species on the surface as genuine active sites . The mass performance of NiFe-based catalysts will greatly depend on the surface area of the catalysts and therefore their particle size.…”

Section: Surface Area Of Catalysts With Different Sizementioning

confidence: 99%

“…11 Once subjected to the alkaline OER condition, most high-performing NiFe-based catalysts were found to involve oxyhydroxide species on the surface as genuine active sites. 12 The mass performance of NiFe-based catalysts will greatly depend on the surface area of the catalysts and therefore their particle size. Figure 2b shows the overpotentials of NiFe layered double hydroxide (LDH) with different sizes for delivering a mass activity of 100 mA mg −2 , which are clearly dependent on the size of catalysts.…”

Section: Surface Area Of Catalysts With Different Sizementioning

confidence: 99%

Size Effects of Electrocatalysts: More Than a Variation of Surface Area

Han

2022

ACS Nano

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The efficiency of electrocatalytic reactions has been continuously improved in recent years due to the great effort in the development of electrocatalysts. A popular strategy is engineering the size of electrocatalysts for better electrochemical performance and lower cost. Nanosized electrocatalysts with high specific surface area have been widely used in state-of-the-art electrochemical devices such as fuel cells. From an engineering aspect, nanosizing electrocatalysts increases the surface area of the electrode and improves the electrode/device performance. Beyond an engineering scope, this perspective highlights the size effects of certain scientific fundamentals in electrocatalytic reactions. The paper summarizes the representative examples in studying the size effects of electrocatalysts and sheds light on the change of intrinsic properties of electrocatalysts caused by the size variation. The size effects of electrocatalysts should be investigated in terms of both engineering and fundamental aspects; that is, the observed activity change is more than a result of surface area variation, and it is interesting to investigate the link between the intrinsic activity and the properties of the catalysts.

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“…However, the reaction rates are greatly restricted by the sluggish kinetics, especially the four-electron (4e − ) transfer processes of OER. [1][2][3] Though the noble metal-based oxides are the benchmark anode electrocatalysts (RuO 2 and IrO 2 ). The scarce earth reserves and high prices severely limit the application on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Abundant Dislocation Layered Double Hydroxides Synthesis by Molten Salt with Bound Water Boosting Oxygen Evolution

Chen

Cui

et al. 2022

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Recently, great effort has been applied to explore non-noble metal catalysts. However, the ambiguous understanding of active transfer mechanisms hinders the electrocatalysts design. [6][7][8] It has been reported that the appropriate design of the crystal distortion can improve catalytic performance for the modulated electronic structure of the active site. [9][10][11] Nevertheless, in the past, all the strategies focused on replacing the element of octahedron with others, which was inevitable for the change of intrinsic electronic structure caused by the introduction of other elements. [12,13] Meanwhile, most studies have focused on analyzing electronic structures while the contribution of structural changes for the generation of active phases is ignored chronically. [14][15][16] In fact, the active phase generated during the electrochemical process is considered to be the truly electrochemically active substance. [3,17,18] Besides, the coexistence of octahedral and tetrahedral in oxides such as spinel and chalcocite also limits further understanding of the accurate catalytic mechanism. [19,20] Notably, introducing strain not only generates the inner strain energy promoting the active phase transformation but also can tune the distortion degree of octahedral, thereby modulating their electronic structure and catalytic properties. [21] It is interesting to note that layered double hydroxides (LDHs) are composed entirely of octahedral. [22][23][24] Hence, the intrinsic effects of octahedral deformation can be well analyzed to help the development of advanced electrocatalysts. Moreover, it has excellent intrinsic activity comparable to precious metals, including RuO 2 and IrO 2 .Firstly, we use the density functional theory (DFT) calculations to reveal that tensile stress modifies the electronic structure. The distribution of e g and t 2g electrons was changed and the d band center was enhanced, optimizing adsorption energy and promoting OER process. Despite this, there remain many obstacles to introducing strain into the LDHs. As a kind of hydroxide, LDHs are very fragile and very easy to destroy in the process of producing internal stress. Dislocations have stress fields that are capable of generating the required tensile stress to modulate the catalytic performance and are able to modulate the catalytic performance (Figures S1 and S2, Supporting Information). Therefore, strain energy can be introduced by

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Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

Abstract: NiFe alloy catalysts have received increasing attention due to their low cost, easy availability, as well as excellent oxygen evolution reaction (OER) catalytic activities. Although it is agreed that the...

Cited by 85 publications

References 102 publications

Rational design of NiFe alloys for efficient electrochemical hydrogen evolution reaction: effects of Ni/Fe molar ratios

Rational design of NiFe alloys for efficient electrochemical hydrogen evolution reaction: effects of Ni/Fe molar ratios

Size Effects of Electrocatalysts: More Than a Variation of Surface Area

Abundant Dislocation Layered Double Hydroxides Synthesis by Molten Salt with Bound Water Boosting Oxygen Evolution

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