Metallic nanostructures with low dimensionality for electrochemical water splitting

Li, Leigang; Wang, Pengtang; Shao, Qi; Huang, Xiaoqing

doi:10.1039/d0cs00013b

Cited by 673 publications

(401 citation statements)

References 199 publications

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“…lectrocatalytic processes play a vital role in energy conversion and reducing the environmental pollution [1][2][3][4][5] . To improve the activity, selectivity, and stability of the catalytic reaction, it is necessary to develop high-performance advanced catalysts that can meet the needs of rapid development [6][7][8][9][10][11][12] . High-entropy alloys (HEAs) have attracted wide interest as catalytic materials in the past few years [13][14][15][16] .…”

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Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis

et al. 2020

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Designing electrocatalysts with high-performance for both reduction and oxidation reactions faces severe challenges. Here, the uniform and ultrasmall (~3.4 nm) high-entropy alloys (HEAs) Pt18Ni26Fe15Co14Cu27 nanoparticles are synthesized by a simple low-temperature oil phase strategy at atmospheric pressure. The Pt18Ni26Fe15Co14Cu27/C catalyst exhibits excellent electrocatalytic performance for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). The catalyst shows ultrasmall overpotential of 11 mV at the current density of 10 mA cm−2, excellent activity (10.96 A mg−1Pt at −0.07 V vs. reversible hydrogen electrode) and stability in the alkaline medium. Furthermore, it is also the efficient catalyst (15.04 A mg−1Pt) ever reported for MOR in alkaline solution. Periodic DFT calculations confirm the multi-active sites for both HER and MOR on the HEA surface as the key factor for both proton and intermediate transformation. Meanwhile, the construction of HEA surfaces supplies the fast site-to-site electron transfer for both reduction and oxidation processes.

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confidence: 99%

Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis

et al. 2020

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“…Recent studies have shown that loading active nanoparticles onto conductive substrates to form heterostructures could greatly enhance the stability and alter the local geometric and electronic structures at the interfaces due to the strong interaction between these two components. [14,15,[33][34][35][36] Among these conductive substrates, 2D porous carbon (2DPC) nanosheets demonstrated great potential with thicknesses of submicrometer/nanometer, interconnected pores, long-range conductivity and chemical stability. [37,38] Therefore, they could provide geometrical exposure, prevent deactivation, and maximize efficient contact with electrolytes during catalysis.…”

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confidence: 99%

A Novel Heterostructure Based on RuMo Nanoalloys and N‐doped Carbon as an Efficient Electrocatalyst for the Hydrogen Evolution Reaction

et al. 2020

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Heterostructures, [1] particularly 2D heterostructures, have shown great potential in the field of catalytic energy conversion due to the fascinating synergism of different components in tuning electronic structures for promoted surface catalysis. [2-5] In typical catalytic reactions, heterostructures always need to be exposed to corrosive liquids and gases to fully interact with the reactants. Therefore, the rational design and synthesis of heterostructures that have rich exposed active sites and highly stable heterointerfaces are rising as an appealing and critical issue in the area of energy conversion. On the other hand, hydrogen generated from electrochemical water splitting is regarded as an ideal alternative to fossil fuels because of its ultrahigh gravimetric energy density, zero-carbon emission, and natural abundance. [6-10] Currently, the alkaline electrolyzers are technically more available for the production of electrocatalytic hydrogen, such as in the water-alkaline electrolysis and in the chloralkaline industry, owing Heterostructures exhibit considerable potential in the field of energy conversion due to their excellent interfacial charge states in tuning the electronic properties of different components to promote catalytic activity. However, the rational preparation of heterostructures with highly active heterosurfaces remains a challenge because of the difficulty in component tuning, morphology control, and active site determination. Herein, a novel heterostructure based on a combination of RuMo nanoalloys and hexagonal N-doped carbon nanosheets is designed and synthesized. In this protocol, metal-containing anions and layered double hydroxides are employed to control the components and morphology of heterostructures, respectively. Accordingly, the as-made RuMo-nanoalloysembedded hexagonal porous carbon nanosheets are promising for the hydrogen evolution reaction (HER), resulting in an extremely small overpotential (18 mV), an ultralow Tafel slope (25 mV dec −1), and a high turnover frequency (3.57 H 2 s −1) in alkaline media, outperforming current Ru-based electrocatalysts. Firstprinciple calculations based on typical 2D N-doped carbon/RuMo nanoalloys heterostructures demonstrate that introducing N and Mo atoms into C and Ru lattices, respectively, triggers electron accumulation/depletion regions at the heterosurface and consequently reduces the energy barrier for the HER. This work presents a convenient method for rational fabrication of carbon-metal heterostructures for highly efficient electrocatalysis.

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“…[2,3] More importantly, the incompatibility and the sluggish kinetics for HER and OER can lead to inferior efficiency in a single watersplitting device. [4] Thus, designing an efficient bifunctional catalyst with high activity and stability is therefore needed to improve both the HER and OER performance under the same conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the highest activity catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is platinum (Pt) and iridium (Ir)/ruthenium (Ru) oxides, respectively, but the high price and scarcity greatly hinder their widespread adoption of industrial applications . More importantly, the incompatibility and the sluggish kinetics for HER and OER can lead to inferior efficiency in a single water‐splitting device . Thus, designing an efficient bifunctional catalyst with high activity and stability is therefore needed to improve both the HER and OER performance under the same conditions.…”

Section: Introductionmentioning

confidence: 99%

Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

Liu

et al. 2020

ChemCatChem

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Interfacial engineering and defect modulation can provide abundant active sites for catalysts to further boost the catalysis process. In this work, we develop a strategy to grow multiheterogeneous cobalt phosphide (CoP) nanorods with rich interfaces and defects along the one-dimensional (1D) nanostructure by dual incorporation of Fe and Ru (CoFeP@Ru). Such a catalyst exhibits high activity and stability towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with overpotentials of only 38 mV in 0.5 M H 2 SO 4 and 48 mV in 1.0 M KOH for HER, and an overpotential of 340 mV in 0.1 M KOH for OER at 10 mA cm À 2. Finally, as the bifunctional catalyst, an alkali electrolyzer is assembled and delivers at a low cell voltage, with almost 100 % Faradaic efficiency. Our experimental results demonstrate that Fe incorporation can disturb or even break the periodic structure of cobalt phosphides, causing a redistribution of the electronic structure and electron density of activity sites, while Ru can significantly enhance the catalytic kinetics, as well as electrochemical and mechanical stability.

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Metallic nanostructures with low dimensionality for electrochemical water splitting

Abstract: The recent advances in 1D and 2D metallic nanostructures for electrochemical water splitting (HER and OER) are highlighted.

Cited by 673 publications

References 199 publications

Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis

Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis

A Novel Heterostructure Based on RuMo Nanoalloys and N‐doped Carbon as an Efficient Electrocatalyst for the Hydrogen Evolution Reaction

Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

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