Efficient preparation of Ni-M (M = Fe, Co, Mo) bimetallic oxides layer on Ni nanorod arrays for electrocatalytic oxygen evolution

Yan, Yonggao; Liu, Haocen; Liu, Chunyue; Zhao, Yuguo; Liu, Shuzhen; Wang, Dong; Fritz, Mathias; Ispas, Adriana; Bund, Andreas; Schaaf, Peter; Wang, Xiayan

doi:10.1016/j.apmt.2021.101185

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…5d): such as CoPO@C (353 mV), 51 Ni–Fe/er-VG (367 mV), 52 Ni 0.9 Al 0.1 MoO 4 (362 mV), 53 TACoPc + IrO 2 (350 mV), 54 Ni 3 S 2 @NGCLs (346 mV), 55 Ni x Co y MnzO 4 -300 (393 mV), 56 Ni/Ni-N 0.28 /NF (363 mV), 57 Ni–Fe NRAs (402 mV). 58 The Tafel slope of H 2 -V S /rGO (Fig. 5b) was 84.4 mV dec −1 and the charge transfer resistance (Fig.…”

Section: Resultsmentioning

confidence: 93%

Vacancy-rich graphene supported electrocatalysts synthesized by radio-frequency plasma for oxygen evolution reaction

Yang

2022

Inorg. Chem. Front.

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Section: Resultsmentioning

confidence: 93%

Vacancy-rich graphene supported electrocatalysts synthesized by radio-frequency plasma for oxygen evolution reaction

Yang

2022

Inorg. Chem. Front.

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“…[30] Some studies found that the mixed-valence states of transition metals are beneficial to the electrochemical reaction due to the effect of electron drawing and donating. [35] However, Ni As shown in Figure 3b, Se 3d in NiCoSe is negatively shifted compared to NiFeSe, which demonstrates the increase of charge density in Se atom. The peaks located at 59 eV is indexed to SeO x due to the surface oxidation.…”

Section: Resultsmentioning

confidence: 87%

“…[ 30 ] Some studies found that the mixed‐valence states of transition metals are beneficial to the electrochemical reaction due to the effect of electron drawing and donating. [ 35 ] However, Ni 2p 3/2 in NiFeSe is positively shifted to 856.15 eV compared to NiCoSe (Ni 2p 3/2 in 855.3 eV) and the intensity of Ni 3+ peak increased slightly. The shift of the Ni peak can be explained by the strong ability of Fe 3+ to withdraw electron from Ni atoms, leading to the reduction in charge density of Ni atoms.…”

Section: Resultsmentioning

confidence: 99%

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Electronic Structure Modulation of Nickel Sites by Cationic Heterostructures to Optimize Ethanol Electrooxidation Activity in Alkaline Solution

Chen

et al. 2023

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stemming from high overpotential due to the sluggish four-electron transfer of anodic oxygen evolution reaction (OER). [2] To solve above problems, the novel idea of hybrid water electrolysis has been proposed, in which thermodynamically favorable organic reforming reactions are selected to replace the OER. [3] Consequently, organic biomass can be oxidized to high value-added products at low potentials, realizing decoupled hydrogen evolution from water splitting. Ethanol (CH 3 CH 2 OH) is a clean, economical, and sustainable energy source which can be easily obtained, stored, and transported. [4] Therefore, anodic ethanol electro-oxidation reaction (EOR) has been considered as a promising strategy to replace oxygen evolution reaction (OER), reducing the energy consumption for hydrogen generation and co-producing high-value-added chemicals.Normally, platinum group metals (PGMs) have the best catalytic activity as EOR catalysts. [5,6] But the PGMs have some drawbacks such as high cost. [7] The reaction intermediates are easily adsorbed on the catalysts, poisoning the active sites, and causing the rapid decay of EOR. [8,9] Furthermore, serious security issue due to mixing of O 2 and H 2 could not be avoided. [2] However, these problems will be resolved if non-platinum group metals (NPGMs) are used as catalyst. [10][11][12][13][14] Similar with PGMs, the EOR on NPGMs also encounter with the sluggish kinetics of the multi-electron transfer process. [15] Thus, it is important to develop cost-effective electrochemical catalyst with high reactivity for EOR. [16] Recently, abundant Ni-based EOR catalysts have been reported. [17,18] However, the catalytic mechanism of these Nibased electrocatalysts still remains uncertain. It has become a consensus that Ni species with high valence are active sites for OER. [19,20] However, this does not seem to be the case with EOR. So the determination of the active sites of Ni-based catalysts for EOR is a problem to be solved. In order to improve the catalytic activity, many approaches have been conducted, such as vacancy engineering, [21,22] heteroatom doping, [23,24] crystalline phase transforming, [25,26] and heterostructure constructing. [27,28] However, the effect of above approaches on the modulation of electronic structure and coordination environment of Ni sites remains uncertain. [4] Thus, it is important to determine the It is a good idea for efficient production of hydrogen to use ethanol oxidation reaction (EOR) in place of oxygen evolution reaction (OER) in water electrolysis process. Ni-based non-precious electrocatalysts are widely used in the conversion of ethanol to acetic acid. Here, different selenide heterostructures (NiCoSe, NiFeSe, and NiCuSe) are prepared in which Ni sites are regulated by transition metal. The valence state of Ni is NiCuSe < NiCoSe < NiFeSe in the three heterojunctions. NiCoSe shows the optimized charge distribution of Ni sites and outstanding catalytic activity. The effective modulations lead to optimized d-band center and facilitates both adsor...

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“…[1][2][3][4][5][6] Transition metalbased oxides/hydroxides/oxyhydroxides are best suited for OER in an alkaline medium. [1,[7][8][9][10][11][12][13][14][15][16][17][18] Heteroatom doped carbon nanostructures are well known for ORR. [2,[19][20][21][22][23][24][25][26][27][28][29] Further, incorporating metal/ alloy improves the ORR activity.…”

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confidence: 99%

Design of Hierarchical Oxide‐Carbon Nanostructures for Trifunctional Electrocatalytic Applications

Devi

Bisen

Cao

et al. 2022

Adv Materials Inter

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The rational design of efficient trifunctional catalysts for oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) is of significant importance for metal–air batteries and electrolyzers. Herein, a hierarchical carbon architecture that comprises of 1D tubes and 2D sheets supported on Ni–Co oxide is synthesized. The 1D–2D carbon nanostructures further support homogeneously dispersed Co/Ni–Nx centers, NiCo and its oxide nanoparticles that are beneficial for ORR, HER, and OER, respectively. The hierarchical nanostructures offer highly exposed surface that enables the maximum utility of active sites for different reactions and also provide a single platform that can be used as OER–ORR and OER‐HER bifunctional catalyst for metal– air batteries and electrolyzers, respectively. The catalyst displays a low ΔE (EJ(OER) = 10 − E½(ORR)) of 0.846 V for bifunctional OER–ORR and low potential of 1.54 V at 10 mA cm−2 for overall water splitting with appreciable durability for 40 h. Overall, the nanostructures exhibit remarkable activity and are durable for OER, ORR, and HER. Moreover, the study offers a pathway to expand the functionality of the non‐noble electrocatalyst and simultaneously offers a platform to prove that preferential active sites exist for different reactions.

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Efficient preparation of Ni-M (M = Fe, Co, Mo) bimetallic oxides layer on Ni nanorod arrays for electrocatalytic oxygen evolution

Cited by 10 publications

References 38 publications

Vacancy-rich graphene supported electrocatalysts synthesized by radio-frequency plasma for oxygen evolution reaction

Vacancy-rich graphene supported electrocatalysts synthesized by radio-frequency plasma for oxygen evolution reaction

Electronic Structure Modulation of Nickel Sites by Cationic Heterostructures to Optimize Ethanol Electrooxidation Activity in Alkaline Solution

Design of Hierarchical Oxide‐Carbon Nanostructures for Trifunctional Electrocatalytic Applications

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