Reliable bi-functional nickel-phosphate /TiO2 integration enables stable n-GaAs photoanode for water oxidation under alkaline condition

Arunachalam, Maheswari; Kanase, Rohini Subhash; Zhu, Kai; Kang, Soon Hyung

doi:10.1038/s41467-023-41120-0

Cited by 17 publications

(1 citation statement)

References 39 publications

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“…However, the efficiency of PEC water splitting primarily hinges on the characteristics of the semiconductor material used as the photoelectrode or working electrode [7][8][9]. Despite exhibiting impressive energy conversion efficiency [10], compound semiconductors such as GaAs are susceptible to corrosion in aqueous environments. In contrast, oxide-based semiconductor photoelectrodes, while demonstrating lower energy conversion efficiency, offer superior corrosion resistance and are therefore considered ideal choices from a commercial standpoint, given their longevity [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Tailored Nanoscale Architectures for White Light Photoelectrochemistry: Zinc Oxide Nanorod-Based Copper Oxide Heterostructures

Fu,

Chen,

et al. 2023

Coatings

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This study investigates the morphological evolution, optical properties, and photoelectrochemical (PEC) performance of copper-oxide-coated ZnO nanorods under different annealing conditions. Distinct effects of annealing temperature and atmosphere on Cu2O and CuO growth on ZnO nanorods were observed. SEM images revealed the transformation of Cu2O from silk-like to mushroom-like structures, while CuO formed interconnecting nanomaterials. XRD and XPS analyses showed peak shifts and binding energy changes, highlighting structural and electronic modifications induced by annealing. Moreover, PEC measurements demonstrated the superior photoresponse of CuO-coated ZnO nanorods, especially under negative bias, attributed to favorable band structure, charge carrier separation, and annealing stability compared to Cu2O-coated ones. A noteworthy discovery is that ZnO nanorods coated with CuO nanostructures, prepared under air conditions at 400 °C annealing temperature, exhibit exceptional photocurrents. Applying a 0.4 V voltage increases the photocurrent by approximately 10 mA/cm2. The findings provide valuable insights into tailoring metal oxide semiconductor nanostructures for potential applications in diverse areas, including photoelectrochemistry. This study offers practical guidance on modulating nanostructure growth through annealing to enhance performance. The results hold significance for PEC water splitting and have far-reaching impacts on photocatalysis, environmental remediation, and solar cells.

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Section: Introductionmentioning

confidence: 99%

Tailored Nanoscale Architectures for White Light Photoelectrochemistry: Zinc Oxide Nanorod-Based Copper Oxide Heterostructures

Fu,

Chen,

et al. 2023

Coatings

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Interfacial Charge Transfer Bridge Prolongs Carrier Recombination Lifetimes of CoFe Metal‐Thiolate Framework/Hematite Photoanode for Water Oxidation

Yang,

Chen,

Yue

et al. 2024

Adv Funct Materials

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Constructing heterostructural photoanodes is attractive for elevating the photoelectrochemical (PEC) performance, however, it is a long‐standing challenge to achieve highly efficient interfacial charge transfer. Herein, a CoFe metal‐thiolate framework (CoFe MTF)/Fe2O3 photoanode connected by an interfacial Fe─O─N/S bond is designed to modulate the behavior of charge carriers and improve water oxidation performance. It is disclosed that this interfacial bond functions as a direct charge transfer bridge between shallow trap states of Fe2O3 and CoFe MTF, leading to prolonged carrier recombination lifetimes (85 ns for CoFe MTF/Fe2O3 compared to 37 ns for Fe2O3) and enhanced charge transfer efficiency. Alternatively, a robust interfacial electric field is established in the CoFe MTF/Fe2O3 p–n heterojunction, facilitating efficient charge transfer. As expected, the CoFe MTF/Fe2O3 photoanode exhibits significant enhancement in water oxidation, resulting in a three‐fold increase in photocurrent density compared to pristine Fe2O3. This study highlights the significance of designing interfacially bonded heterostructural photoelectrodes to regulate the transfer characters of charge carriers.

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Proton‐Coupled Electron Transfer in Photoelectrochemical Alcohol Oxidation Enhanced by Nickel‐Based Cocatalysts

Gao,

Mu,

Feng

et al. 2024

Angewandte Chemie

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Using biomass oxidation reactions instead of water oxidation reactions is optimal for accomplishing biomass conversion and effective hydrogen generation. Here, we report that Fe2O3 photoanodes with a NiOOH cocatalyst exhibit excellent performance for photoelectrochemical oxidation of 5‐hydroxymethylfurfural (HMF) to 2,5‐furandicarboxylic acid (FDCA). The conversion efficiency for HMF reaches 98.5%, while the selectivity for FDCA is 94.2%. We revealed that HMF is oxidized through a spontaneous proton‐coupled electron transfer (PCET) process with the high‐valent phase of the Ni‐based catalyst. The dangling oxygen and bridging oxygen of the high‐valent phase species serve as proton‐accepting sites. Furthermore, we pointed out that the deprotonated bond dissociation free energy difference between the catalysts and alcohols is the thermodynamic trigger for the PCET process. This study provides a reasonable explanation for the alcohol oxidation reaction, which is beneficial for designing biomass conversion systems.

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Reliable bi-functional nickel-phosphate /TiO2 integration enables stable n-GaAs photoanode for water oxidation under alkaline condition

Cited by 17 publications

References 39 publications

Tailored Nanoscale Architectures for White Light Photoelectrochemistry: Zinc Oxide Nanorod-Based Copper Oxide Heterostructures

Tailored Nanoscale Architectures for White Light Photoelectrochemistry: Zinc Oxide Nanorod-Based Copper Oxide Heterostructures

Interfacial Charge Transfer Bridge Prolongs Carrier Recombination Lifetimes of CoFe Metal‐Thiolate Framework/Hematite Photoanode for Water Oxidation

Proton‐Coupled Electron Transfer in Photoelectrochemical Alcohol Oxidation Enhanced by Nickel‐Based Cocatalysts

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