Microwave-assisted in situ growth of VO2 nanoribbons on Ni foam as inexpensive bifunctional electrocatalysts for the methanol oxidation and oxygen evolution reactions

Sreekanth, T.V.M.; Tamilselvan, Muthusamy; Yoo, Kisoo; Kim, J.

doi:10.1016/j.apsusc.2021.151119

Cited by 18 publications

(9 citation statements)

References 38 publications

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“…Similarly, after the addition of GO, there were no observable changes in peak shift, although an enhancement in the current density was noticeable, which indicated that the addition of GO increased the current density of the electrocatalysts ( Figure 6 b,d). The surface coverage (Γ * ) was calculated for the electrocatalysts [ 39 ], and the corresponding plot is shown in Figure S3a . The Γ * values of electrocatalysts MW-7, MW-12, MW@GO-7, and MW@GO-12 are 1.47 × 10 −7 , 1.94 × 10 −7 , 4.53 × 10 −7 , and 8.19 × 10 −7 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The electrochemical active surface area (ECSA) is a crucial parameter to identify the electrochemical performance. The ECSA was measured by the previously reported method [ 39 ], and the corresponding CV curves are shown in Figure S4 . The double-layer capacitance (C dl ) of electrocatalysts were 3, 5, 9, and 30 mF g −1 for MW-7, MW-12, MW@GO-7, and MW@GO-12, respectively ( Figure 7 a,b).…”

Section: Resultsmentioning

confidence: 99%

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Hydrothermal Synthesis of MnWO4@GO Composite as Non-Precious Electrocatalyst for Urea Oxidation

et al. 2021

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In this study, manganese tungstate (MW) and MW/graphene oxide (GO) composites were prepared by a facile hydrothermal synthesis at pH values of 7 and 12. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were used for the structural, compositional, and morphological characterization of the nanoparticles (NPs). The XRD analysis revealed that the formation of monoclinic MnWO4 did not have impurities. The SEM and TEM analyses showed that the synthesized NPs were rod-shaped and well-distributed on the GO. The as-synthesized samples can be used as electrocatalysts for the urea oxidation reaction (UOR). The MW@GO-12 electrocatalyst exhibited higher current density values compared to other electrocatalysts. This study provides a new platform for synthesizing inexpensive nanocomposites as promising electrocatalysts for energy storage and conversion applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of MnWO4@GO Composite as Non-Precious Electrocatalyst for Urea Oxidation

et al. 2021

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“…[26] Importantly, SSECs can be used directly as electrodes for water splitting without the addition of organic binders, which overcomes the shortcomings of low conductivity and covered active centers of powder catalysts. Currently, self-supported electrocatalysts are prepared mainly by hydrothermal or solvothermal methods, [27][28][29][30] calcination methods, [31][32][33] high-pressure microwave methods, [34][35][36] and electrodeposition methods, [37][38][39] which have the disadvantages of complex steps, harsh reaction conditions, harmful products, and large energy consumption. Especially, some complex reaction systems with low controllability are difficult to produce electrocatalysts repeatedly.…”

Section: Introductionmentioning

confidence: 99%

Construction of Non‐Precious Metal Self‐Supported Electrocatalysts for Oxygen Evolution from a Low‐Temperature Immersion Perspective

Xin

Cang

Wang

et al. 2023

The Chemical Record

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Water splitting is considered as a promising technology to solve energy shortage and environmental pollution. Since oxygen evolution reaction (OER) directly affects the efficiency of hydrogen evolution, the preparation of efficient and inexpensive OER catalysts is an urgent problem. “Low‐temperature immersion” (LTI) is expected to be a prospective strategy for electrocatalyst preparation due to its simplicity and energy‐saving advantages. However, there is almost no comprehensive overview on the progress of LTI engineering in the construction of non‐precious metal self‐supported electrocatalysts for OER. Herein, this review firstly introduces the principles and applications of LTI engineering‐assisted preparation of non‐precious metal self‐supported electrocatalysts in terms of etching and deposition. Then the mechanism of OER is analyzed from an amorphous viewpoint, and finally some perspective insights and future challenges of this method are discussed.

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“…[8][9][10] Non-precious metals, such as nickel, are considered as the potential alternatives to the Pt and Pd-based catalysts. [11][12][13] However, the pure non-precious metal electrocatalysts show low performance for alkaline methanol oxidation reaction. As we all know, introduction the appropriate second metal or components can modify the electronic structures of the active metals and further improve the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

“…Non‐precious metals, such as nickel, are considered as the potential alternatives to the Pt and Pd‐based catalysts [11–13] . However, the pure non‐precious metal electrocatalysts show low performance for alkaline methanol oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Electronic Structures of TMNs‐Modified Ni‐Based Catalysts to Enhance the Performance for MOR in Alkaline Media

et al. 2023

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Transition metal nitrides are considered as the promising materials in the energy conversion processes due to the similar electronic structures to Pt. In this work, a series of Ni/TMN−C (TM=V, Mo, Nb, Ta) catalysts were synthesized and investigated the catalytic performance for methanol oxidation reaction in alkaline media. The electrochemical measurements indicated that the TNNs‐modified Ni/C catalysts exhibited higher activity, kinetics, charge transfer and stability for alkaline MOR compared with Ni/C. It was found that the incorporation of TMNs improved the activity and stability for MOR in various degree. Specially, Ni/VN−C showed the highest catalytic activity, nearly three times higher than that of Ni/C due to the highest coverage of the surface component NiOOH, consistent with the Tafel and EIS results that it exhibited the fastest charge transfer kinetics and reaction rate. XPS characterization indicated that the obvious electron interaction occurred between the TMNs and Ni species and Ni would transfer electrons to the transition metal nitrides, resulting in the electron‐rich states of TMNs. Interestingly, combining the d‐band center and activity of the corresponding catalysts, it could be found that a volcano plot existed between them, suggesting that the introduction of appropriate nitrides would change the electronic structure of Ni and enhance the catalytic performance for MOR in alkaline media.

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Microwave-assisted in situ growth of VO2 nanoribbons on Ni foam as inexpensive bifunctional electrocatalysts for the methanol oxidation and oxygen evolution reactions

Cited by 18 publications

References 38 publications

Hydrothermal Synthesis of MnWO4@GO Composite as Non-Precious Electrocatalyst for Urea Oxidation

Hydrothermal Synthesis of MnWO4@GO Composite as Non-Precious Electrocatalyst for Urea Oxidation

Construction of Non‐Precious Metal Self‐Supported Electrocatalysts for Oxygen Evolution from a Low‐Temperature Immersion Perspective

Tuning the Electronic Structures of TMNs‐Modified Ni‐Based Catalysts to Enhance the Performance for MOR in Alkaline Media

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