Porous amorphous FeCo alloys as pre-catalysts for promoting the oxygen evolution reaction

Zhu, Wenjuan; Zhu, Guoxing; Yao, Chengli; Chen, Hu; Hu, Jing; Zhu, Yi; Wenfu, Liang

doi:10.1016/j.jallcom.2020.154465

Cited by 54 publications

(14 citation statements)

References 62 publications

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“…Liang and co‐workers [ 156 ] designed and prepared a FeCo alloy with an amorphous and porous structure via one‐pathway‐based NaBH 4 . The MG product with a Co:Fe molar ratio of 2:1 illustrates an optimal intrinsic catalytic activity for water oxidation, springing from the amorphous and porous architecture as well as the powerfully synergistic effect of the bimetal component.…”

Section: The Exceptionally Advantaged Nature Of Amorphous Catalysts Tmentioning

confidence: 99%

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

et al. 2020

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Electrochemical water splitting is regarded as a most effective hydrogen production technique. In fact, quite a few exceptional electrocatalysts, processes, and even large‐scale demonstrations have been developed. In particular, some amorphous catalysts have become well‐known for their extraordinary performance on account of their disordered structure, numerous, uniformly distributed active sites with high unit activity and better stability that outshine their single‐crystalline counterparts. Herein, a review of recent research advances of amorphous catalysts used in electrocatalytic water splitting are provided, including both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Particularly, the scaled‐up application of amorphous catalysts with multifarious compositions and diverse heterostructures in electrolyzing water and the reason why amorphous catalysts exhibit excellent catalytic performance are emphasized on. In addition, the mechanism of water electrolysis and the evaluation criteria of catalytic properties are analyzed in detail. Finally, the broader development outlook of amorphous catalysts is discussed.

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Section: The Exceptionally Advantaged Nature Of Amorphous Catalysts Tmentioning

confidence: 99%

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

et al. 2020

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“…Similar to HER, the most direct way to improve the catalytic activity is to directly synthesize cluster nanoparticles or to prepare nanopores and nanopits on the catalyst by dealloying and other methods. A black solid product (FeCo amorphous alloy) was obtained by mixing and stirring a CoCl 2 , FeCl 3 , and Na 3 Co(NO 2 ) 6 solution, 71 possessing an irregular porous structure, as shown in Figure 6(i). When the molar ratio of Fe to Co is 1:2, it shows the best OER performance of a Tafel slope 62 mV/dec and η 10 of 290 mV, as shown in Figure 6(k).…”

Section: Application Of Amorphous Alloys Inmentioning

confidence: 99%

Recent Advances and Perspectives of Nanostructured Amorphous Alloys in Electrochemical Water Electrolysis

et al. 2021

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The energy crisis put forward higher requirements for the development of sustainable energy systems, and the production of green hydrogen by electrochemical water electrolysis is one of the important ways to achieve this goal. Transition metal amorphous alloys have been widely investigated as efficient electrocatalysts for water electrolysis. However, the low catalytic activity, high cost, lack of multifunction, poor stability, and unclear catalytic mechanism on amorphous alloy electrocatalysts have severely limited their efficiency. In this review, we summarize the recent progress on amorphous alloys. Specifically, the characteristics, structure, and preparation methods of amorphous alloys and their application, especially in water electrolysis, are discussed in detail. On the basis of the function-oriented design and the solution of key problems, the electrocatalytic performance has been effectively improved in quantity and quality. In the future, studies should focus on the aspects of controlling material morphology, element doping, composite structure, and interface characteristics, as well as the structure–activity relationship and synergetic effect. This review is of great significance to promote the study of structural design, structure–activity relationship, efficiency improvement, and catalytic mechanisms in electrocatalysis.

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“…It is commonly believed that the structure or composition of as‐obtained catalyst, after OER process, would vary compared to its original state, and the already‐varied part of catalyst would serve as the main active species to drive the OER. That is, the as‐obtained catalyst merely serves as pre‐catalyst [45] . To understand the variation of the micromorphology and chemical property of the sample after OER treatment, we first chose 0.2Mo−Co as main research target and then conducted chronopotentiometry test at 10 mA cm −2 to test its OER catalytic stability, followed by SEM observation and XPS measurement to investigate possible variation of element state.…”

Section: Resultsmentioning

confidence: 99%

“…That is, the as-obtained catalyst merely serves as pre-catalyst. [45] To understand the variation of the micromorphology and chemical property of the sample after OER treatment, we first chose 0.2MoÀ Co as main research target and then conducted chronopotentiometry test at 10 mA cm À 2 to test its OER catalytic stability, followed by SEM observation and XPS measurement to investigate possible variation of element state. The results are shown in Figure 5.…”

Section: Chemsuschemmentioning

confidence: 99%

Facile Synthesis of Amorphous MoCo Lamellar Hydroxide for Alkaline Water Oxidation

et al. 2021

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To find an oxygen evolution reaction (OER) catalyst with satisfactory catalytic performance and affordable cost is of great importance to the development of many new energy devices. In this work, a simple and effective strategy was developed to synthesize a series of amorphous MoCo lamellar hydroxide through one-step chemical co-precipitation. Systematic investigations showed that different functional agents (2-methylimidazole, NaOH, NH 4 OH) in the fabrication process resulted in different micromorphology of the catalyst, thus influencing its electrocatalytic performance. Also, adding various amounts of Mo could influence the intrinsic catalytic properties. Samples synthesized with appropriate functional agent addition and optimized Mo addition exhibited amorphous nature and bent nanosheet morphology, as well as highest intrinsic catalytic activity, showing a low overpotential of 290 mV at 10 mA cm À 2 and a small Tafel slope of 55 mV dec À 1 in 1 m KOH solution. Additionally, the catalytic performance of the sample showed just small decay after 50 h chronopotentiometry test and 3000 cyclic voltammetry cycles, exhibiting the ultra-stable catalytic activity of the catalyst. This work provides a possible large-scale commercial production strategy of OER catalysts with promising performance and low fabrication cost.

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Porous amorphous FeCo alloys as pre-catalysts for promoting the oxygen evolution reaction

Cited by 54 publications

References 62 publications

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

Recent Advances and Perspectives of Nanostructured Amorphous Alloys in Electrochemical Water Electrolysis

Facile Synthesis of Amorphous MoCo Lamellar Hydroxide for Alkaline Water Oxidation

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