Mo-doped BiVO4@reduced graphene oxide composite as an efficient photoanode for photoelectrochemical water splitting

Subramanyam, Palyam; Vinodkumar, T.; Nepak, Devadutta; Deepa, Melepurath; Subrahmanyam, Ch.

doi:10.1016/j.cattod.2018.07.006

Cited by 59 publications

(27 citation statements)

References 52 publications

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“…Although surface self‐reconstruction induced by the etching of non‐metallic element (such as F and Cl) has been extensively observed for various OER catalysts, to the best of our knowledge, dynamic surface self‐reconstruction induced by the leaching of metallic Mo for LDH‐based OER catalysts has been rarely studied. Based on the above analysis, we can safely conclude that: (1) Mo doping contributes to the increased amount of OVs in the bulk Mo:NiFe‐LDH owing to the presence of Mo 5+ cations, thus benefitting the improvement in the electrical conductivity of OEC layer; (2) soluble Mo cations can be removed from the Mo:NiFe‐LDH during surface self‐reconstruction, and an increasing number of OVs are exposed on the surface of Mo:NiFe‐LDH‐SR, providing more active sites and accelerating the OER kinetics of Si photoanodes . This explains why the PEC performance of Mo:NiFe‐LDH/NiO x /Ni/Si photoanode increased with repeated LSV scans.…”

Section: Resultsmentioning

confidence: 99%

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Chen

Fan

et al. 2020

ChemSusChem

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Photoelectrochemical (PEC) water splitting has the potential to efficiently convert intermittent solar energy into storable hydrogen fuel. However, poor charge separation and transfer ability as well as sluggish surface oxygen evolution reaction (OER) kinetics of the photoelectrode severely hinder the advance in PEC performance. Herein, a facile electrodeposition method was used to integrate Mo‐doped NiFe‐layered double hydroxide onto a NiOx/Ni‐protected Si photoanode for enhanced PEC water oxidation. Mo doping contributed to an increased amount of oxygen vacancies, whereas a dynamic surface self‐reconstruction was induced by Mo leaching under PEC OER conditions. This led to enhanced PEC performance with an onset potential of 0.87 V vs. reversible hydrogen electrode (RHE), a photocurrent density of 39.3 mA cm−2 at 1.23 V vs. RHE, a fill factor of 0.38, and a solar‐to‐oxygen conversion efficiency of 5.3 %, along with a stability of 130 h continuous PEC reaction. The performance was superior to that of the undoped NiFe‐LDH/NiOx/Ni/Si (4.3 %), which was attributed to the elevated interface charge separation, fast charge transfer, and accelerated OER kinetics.

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Section: Resultsmentioning

confidence: 99%

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Chen

Fan

et al. 2020

ChemSusChem

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“…As a consequence, a lower bulk recombination is obtained, which makes rGO as an effective electron capturing and transferring material. 79,80 The onset potential shi suggest that the role of rGO is to increase the carrier transport and electron collection efficiency.…”

Section: Photoanodesmentioning

confidence: 99%

Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting

et al. 2021

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“…The use of doping elements—or modification by particles such as CdS quantum dots [ 158 ] in usual two-component heterojunctions—is also referred to as a ternary structure. Doping elements such as Yb [ 159 ] and Mo have been shown to suppress charge carrier recombination during photocatalysis [ 160 ], improving the efficiency of reactions. In ref.…”

Section: Heterostructured Wo 3 Nanocomposites Fmentioning

confidence: 99%

Photoactive Tungsten-Oxide Nanomaterials for Water-Splitting

et al. 2020

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This review focuses on tungsten oxide (WO3) and its nanocomposites as photoactive nanomaterials for photoelectrochemical cell (PEC) applications since it possesses exceptional properties such as photostability, high electron mobility (~12 cm2 V−1 s−1) and a long hole-diffusion length (~150 nm). Although WO3 has demonstrated oxygen-evolution capability in PEC, further increase of its PEC efficiency is limited by high recombination rate of photogenerated electron/hole carriers and slow charge transfer at the liquid–solid interface. To further increase the PEC efficiency of the WO3 photocatalyst, designing WO3 nanocomposites via surface–interface engineering and doping would be a great strategy to enhance the PEC performance via improving charge separation. This review starts with the basic principle of water-splitting and physical chemistry properties of WO3, that extends to various strategies to produce binary/ternary nanocomposites for PEC, particulate photocatalysts, Z-schemes and tandem-cell applications. The effect of PEC crystalline structure and nanomorphologies on efficiency are included. For both binary and ternary WO3 nanocomposite systems, the PEC performance under different conditions—including synthesis approaches, various electrolytes, morphologies and applied bias—are summarized. At the end of the review, a conclusion and outlook section concluded the WO3 photocatalyst-based system with an overview of WO3 and their nanocomposites for photocatalytic applications and provided the readers with potential research directions.

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Mo-doped BiVO4@reduced graphene oxide composite as an efficient photoanode for photoelectrochemical water splitting

Cited by 59 publications

References 52 publications

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting

Photoactive Tungsten-Oxide Nanomaterials for Water-Splitting

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