Highly active sites of NiVB nanoparticles dispersed onto graphene nanosheets towards efficient and pH-universal overall water splitting

Arif, Muhammad; Yasin, Ghulam; Shakeel, Muhammad; Mushtaq, Muhammad; Ye, Wen; Fang, Xiaoyu; Ji, Shengfu; Yan, Dongpeng

doi:10.1016/j.jechem.2020.10.014

Cited by 119 publications

(33 citation statements)

References 75 publications

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“…With respect to the P XPS spectrum, the peaks related to Co−P bonds disappear, accompanied by the strengthened peak intensity assigned to the P−O bond (Figure 5f), validating the entire surface oxidation of CoP 2 after OER. In the case of V, the binding energies of V 2p 3/2 and V 2p 1/2 peaks show a positive shift (517.2 and 524.5 eV), corresponding to V 5+ (Figure 5g), [45] indicating the valence of ionic V becomes higher after OER. Besides, the O XPS spectrum displays an obvious increased intensity of peak belonging to the adsorbed H 2 O (Figure 5h), suggesting the H 2 O adsorption ability is improved.…”

Section: Resultsmentioning

confidence: 99%

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

et al. 2022

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Proton exchange membrane water electrolyzer (PEMWE) in acidic media is a hopeful scenario for hydrogen production by using renewable energy sources, but the grand challenge lies in substituting active and stable noble-metal catalysts. Herein, a robust electrocatalyst of V-CoP2 porous nanowires arranged on carbon cloth is successfully fabricated via incorporating vanadium into CoP2 lattice. Structural characterizations and theoretical analysis indicate that lattice expansion of CoP2 caused by V incorporation results in the upshift of d-band center, which is conducive to hydrogen adsorption for boosting HER activity. Besides, V promotes surface reconstruction to generate a thicker Co3O4 layer that enhances acid-corrosion resistance and optimizes the adsorption of water and oxygen-containing species, thus improving OER activity and stability. Accordingly, it presents a superior acidic overall water splitting activity (1.47 V@10 mA cm -2 ) over Pt-C/CC||RuO2/CC, and remarkable stability. This work proposes a new route to design efficient electrocatalysts via lattice engineering for PEMWE.

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Section: Resultsmentioning

confidence: 99%

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

et al. 2022

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“…Robust catalysts have been discovered to promote PEC efficiency, such as noble metals, metal oxides, metal hydroxides, carbon materials, metal phosphides and phosphates. [5][6][7][8][9][10][11][12][13] Among these, copper(II) oxide stands out for PEC water splitting with an excellent optical bandgap (1.2-2.1 eV), appropriate conduction band position (about −0.4 V), high visible-light absorption, notable theoretical photocurrent density (35 mA cm −2 ) and low toxicity. Especially, the elemental abundance of Cu with easy synthesis of its oxide leads to low catalyst cost.…”

Section: Introductionmentioning

confidence: 99%

Architecture lattice‐matched cauliflower‐like CuO/ZnO p–n heterojunction toward efficient water splitting

Zhang

Cai

Shi

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: In photoelectrochemical (PEC) water splitting, hydrogen and oxygen can be dissociated from water molecules on semiconductors by directly utilizing clean renewable solar energy. The key bottleneck of PEC water splitting is to design new types of photoelectrodes with long-term stability and high PEC performance.RESULTS: Here, cauliflower-shaped p-n CuO/ZnO heterojunction photocathodes with lattice matching were synthesized using one-step electrodeposition and heat treatment. The results showed that the deposition of CuO and ZnO took place simultaneously. The proportion of CuO and ZnO varied with the electrodeposition time and calcination temperature and duration. The parallel lattice-matched CuO/ZnO heterojunction enhanced the separation and migration of photogenerated charge carriers, which accomplished a photocurrent density value of approximately −1.8 mA cm −2 at a bias of 0 V RHE in 0.5 mol L −1 Na 2 SO 4 solution.CONCLUSIONS: This work could provide a simplified strategy for the synthesis of p-n copper-based heterogeneous photocathodes for application in PEC water splitting.

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“…62,72,77,106,134,[153][154][155] However, the HER kinetics of these catalysts are still lower than that of Pt/C, while several catalysts showed better OER kinetics than IrO 2 /RuO 2 . 106,[155][156][157][158] Overall, water splitting cell with these transition metal-based catalysts also yield good performance with some that are comparable to the RuO 2 or IrO 2 jj Pt/C cell but mostly within a small current density range from 10 to 100 mA/cm 2 . 77,106,153,157,159,160 Much recently, several Ni-and Co-containing bifunctional catalysts were further investigated for their halfcell performance towards water splitting in 1 M KOH electrolyte.…”

Section: Potential Of Bifunctional Water Splitting Electrocatalysts F...mentioning

confidence: 78%

Recent developments on transition metal–based electrocatalysts for application in anion exchange membrane water electrolysis

Sulaiman

Wong

Loh

2021

Intl J of Energy Research

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Anion exchange membrane water electrolyzer (AEMWE) is a promising technology in water electrolysis for the production of green hydrogen. Unlike conventional alkaline water electrolyzers (AWE), AEMWEs utilize mild alkaline conditions and anion exchange membranes as separators and ionic conductors, respectively. However, the largest merit of AEMWE is the utilization of lowcost transition metals as electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Achieving excellent AEMWE performance using highly active and robust transition metal electrocatalysts is desired for lowering the fabrication cost and realizing the successful commercialization of AEMWE. Water splitting efficiency in the AEMWE largely depends on the kinetics of the HER and OER catalysts. Such a condition requires proper understanding of the reaction mechanisms, careful design and optimization of catalyst materials, and maintenance of catalyst durability under AEMWE conditions during long-term operation. This review discussed recent transition metal HER, OER, and bifunctional water splitting electrocatalysts applied within the actual AEMWE membrane electrode assembly (MEA), where their influence toward the electrolyzer cell performance is highlighted. Additionally, the MEA fabrication methods are briefly addressed.From the review, potential electrocatalyst materials and remaining challenges are identified to provide for future improvements on the AEMWE system.

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Highly active sites of NiVB nanoparticles dispersed onto graphene nanosheets towards efficient and pH-universal overall water splitting

Cited by 119 publications

References 75 publications

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Architecture lattice‐matched cauliflower‐like CuO/ZnO p–n heterojunction toward efficient water splitting

Recent developments on transition metal–based electrocatalysts for application in anion exchange membrane water electrolysis

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Highly active sites of NiVB nanoparticles dispersed onto graphene nanosheets towards efficient and pH-universal overall water splitting

Cited by 119 publications

References 75 publications

Vanadium‐Incorporated CoP2 with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Vanadium‐Incorporated CoP2 with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Architecture lattice‐matched cauliflower‐like CuO/ZnO p–n heterojunction toward efficient water splitting

Recent developments on transition metal–based electrocatalysts for application in anion exchange membrane water electrolysis

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Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting