Photoelectrochemical water oxidation using a Bi2MoO6/MoO3 heterojunction photoanode synthesised by hydrothermal treatment of an anodised MoO3 thin film

Lou, Shi Nee; Scott, Jason; Iwase, Akihide; Amal, Rose; Ng, Yun Hau

doi:10.1039/c6ta00700g

Cited by 76 publications

(45 citation statements)

References 33 publications

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“…The reduction capability of ethylene glycol system was not enough to reduce the NiMoO 4 when the temperature below 130 °C, while the temperatures above 180 °C would result in too fast reduction and thus new nucleation occurred to form nanospheres (Figure S3, Supporting Information). Besides temperature, the concentration of sodium hydroxide and sodium borohydride also influence the topotactic reduction kinetics, increase the concentration would also enhance the reduction rates and thus leading to spontaneous nucleation of NiO 6 and MoO 6 in distorted octahedral NiMoO 4 (Figure S4, Supporting Information) …”

Section: Resultsmentioning

confidence: 99%

“…Besides temperature, the concentration of sodium hydroxide and sodium borohydride also influence the topotactic reduction kinetics, increase the concentration would also enhance the reduction rates and thus leading to spontaneous nucleation of NiO 6 and MoO 6 in distorted octahedral NiMoO 4 ( Figure S4, Supporting Information). [33][34][35][36] The crystalline phase of the NiMoO 4 precursor and Ni-Mo alloy were characterized by X-ray powder diffraction (XRD). To eliminate the strong background of Ni foam substrate ( Figure S5, Supporting Information) on the XRD patterns, both NiMoO 4 and Ni-Mo were scratched from Ni foam by ultrasonication.…”

Section: Introductionmentioning

confidence: 99%

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Superaerophobic Ultrathin Ni–Mo Alloy Nanosheet Array from In Situ Topotactic Reduction for Hydrogen Evolution Reaction

Zhang

Zhou

et al. 2017

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Hydrogen evolution reaction (HER) has prospect to becoming clean and renewable technology for hydrogen production and Ni-Mo alloy is among the best HER catalysts in alkaline electrolytes. Here, an in situ topotactic reduction method to synthesize ultrathin 2D Ni-Mo alloy nanosheets for electrocatalytic hydrogen evolution is reported. Due to its ultrathin structure and tailored composition, the as-synthesized Ni-Mo alloy shows an overpotential of 35 mV to reach a current density of 10 mA cm , along with a Tafel slope of 45 mV decade , demonstrating a comparable intrinsic activity to state-of-art commercial Pt/C catalyst. Besides, the vertically aligned assemble structure of the 2D NiMo nanosheets on conductive substrate makes the electrode "superaerophobic," thus leading to much faster bubble releasing during HER process and therefore shows faster mass transfer behavior at high current density as compared with drop drying Pt/C catalyst on the same substrate. Such in situ topotactic conversion finds a way to design and fabricate low-cost, earth-abundant non-noble metal based ultrathin 2D nanostructures for electrocatalytic issues.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superaerophobic Ultrathin Ni–Mo Alloy Nanosheet Array from In Situ Topotactic Reduction for Hydrogen Evolution Reaction

Zhang

Zhou

et al. 2017

Small

215

108

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“…As we know that more than 43% of the solar radiance onto the Earth’s surface is visible light, compared to titanium dioxide photocatalyst, its catalytic efficiency will be much higher. To further improve photocatalytic performance of Bi 2 MoO 6 , many composite superstructures have been proposed and synthesized, for instance, TiO 2 /Bi 2 MoO 6 [14], Bi 2 MoO 6 /MoO 3 [15], g-C 3 N 4 /Bi 2 MoO 6 [16], Bi 2 MoO 6 -RGO [17] and other photocatalysts have shown a high catalytic activity and light stability. However, these materials are not only high cost and difficult to prepare, but also can accelerate the agglomerate of Bi 2 MoO 6 .…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Nano-Bi2MoO6/Diatomite Composite for Enhancing Photocatalytic Performance under Visible Light Irradiation

et al. 2018

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In this work, a new nano-Bi2MoO6/diatomite composite photocatalyst was successfully synthesized by a facile solvothermal method. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-vis diffuse reflection spectroscopy (DRS) were employed to investigate the morphology, crystal structure, and optical properties. It was shown that nanometer-scaled Bi2MoO6 crystals were well-deposited on the surface of Bi2MoO6/diatomite. The photocatalytic activity of the obtained samples was evaluated by the degradation of rhodamine B (RhB) under the visible light (λ > 420 nm) irradiation. Moreover, trapping experiments were performed to investigate the possible photocatalytic reaction mechanism. The results showed that the nano-Bi2MoO6/diatomite composite with the mass ratio of Bi2MoO6 to diatomaceous earth of 70% exhibited the highest activity, and the RhB degradation efficiency reached 97.6% within 60 min. The main active species were revealed to be h+ and•O2−. As a photocatalytic reactor, its recycling performance showed a good stability and reusability. This new composite photocatalyst material holds great promise in the engineering field for the environmental remediation.

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“…[117] Han et al have prepared as eries of solids olutions of BiOI x Cl 1Àx that show p-type conductivity.BiOI x Cl 1Àx solid solutions with x = 0.5 exhibit higher catalytic activityt han BiO-I x Br 1Àx . [125,126] CuBi 2 O 4 has also been heterojunctioned with CuO to improve its PEC performance;h owever,avery smalli mprovement is achieved. [119] The BiOBr and BiOI composite acts as an n-type semiconductor ands erves as ap hotosensitizer in the visible region for BiOBr/BiOI/ZnO heterojunctions.…”

Section: Heterojunctionmentioning

confidence: 99%

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

2017

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In recent years, bismuth-based nanomaterials have drawn considerable interest as potential candidates for photoelectrochemical (PEC) water splitting owing to their narrow band gaps, nontoxicity, and low costs. The unique electronic structure of bismuth-based materials with a well-dispersed valence band comprising Bi 6s and O 2p orbitals offers a suitable band gap to harvest visible light. This Review presents significant advancements in exploiting bismuth-based nanomaterials for solar water splitting. An overview of the different strategies employed and the new ideas adopted to improve the PEC performance of bismuth-based nanomaterials are discussed. Morphology control, the construction of heterojunctions, doping, and co-catalyst loading are several approaches that are implemented to improve the efficiency of solar water splitting. Key issues are identified and guidelines are suggested to rationalize the design of efficient bismuth-based materials for sunlight-driven water splitting.

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Photoelectrochemical water oxidation using a Bi₂MoO₆/MoO₃ heterojunction photoanode synthesised by hydrothermal treatment of an anodised MoO₃ thin film

Abstract: A photoactive Bi2MoO6/MoO3 heterojunction electrode derived from a direct thin-film-route showed close to 100% faradic photocurrent-to-O2 conversion efficiency.

Cited by 76 publications

References 33 publications

Superaerophobic Ultrathin Ni–Mo Alloy Nanosheet Array from In Situ Topotactic Reduction for Hydrogen Evolution Reaction

Superaerophobic Ultrathin Ni–Mo Alloy Nanosheet Array from In Situ Topotactic Reduction for Hydrogen Evolution Reaction

Facile Preparation of Nano-Bi2MoO6/Diatomite Composite for Enhancing Photocatalytic Performance under Visible Light Irradiation

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

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