An efficient hole transfer pathway on hematite integrated by ultrathin Al2O3 interlayer and novel CuCoOx cocatalyst for efficient photoelectrochemical water oxidation

Zhang, Shaoce; Liu, Zhifeng; Chen, Dong; Yan, Weiguo

doi:10.1016/j.apcatb.2020.119197

Cited by 144 publications

(54 citation statements)

References 45 publications

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“…The nanostructure-interface engineering method provides a promising way to achieves this goal, as it provides more facile carrier transport driving forces and improved interfacial carrier injection kinetics. [40,[66][67][68][69] In practical application, to evaluate whether the photoinduced holes can transfer to the photoanode surface, the diffusion length (L D ) of holes can be described by the following equation: [70,71]…”

Section: Principle Of Pec Water Oxidationmentioning

confidence: 99%

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

et al. 2021

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In practical applications, solar energy is usually converted to other forms of energy, such as electric energy, [9][10][11] chemical energy, [12,13] thermal energy, [14,15] so as to facilitate further transportation and storage. Among them, photoelectrochemical (PEC) reactions from water to hydrogen, CO 2 to C2+ products, and N 2 to NH 3 in the aqueous-based environment have been considered to be quite promising solar-chemical energy conversion pathways. [16][17][18][19] Unlike the traditional water electrolyzing system, the most ideal PEC reaction system can be selfdriven by illumination without external bias. Utilizing the electron-hole carriers generated from the semiconductor photoelectrode, redox reactions take place separately on the photocathode and photoanode. However, as the water oxidation reaction involves a complex four-proton coupled multi-electron process (2H 2 O + 4h + → O 2 + 4H + , E o = 1.23 V vs reversible hydrogen electrode (RHE)), it makes the water oxidation reaction the rate-control step in the watersplitting reaction. [20] Therefore, developing high-performance photo anodes is of great fundamental importance and interest.At the present stage, TiO 2 is the most studied and applied semiconductor photoelectrocatalyst, due to its outstanding chemical stability. [21][22][23] However, as a wide bandgap semiconductor (anatase TiO 2 : 3.2eV, rutile TiO 2 : 3.0 eV), TiO 2 can only respond to the ultraviolet light. Meanwhile, as an intrinsic semiconductor, the bulk/surficial carrier recombination of TiO 2 greatly hinders its practical application. [24][25][26][27] In that case, some narrow bandgap semiconductors are also applied as the photoanode materials, such as Ta 3 N 5 (bandgap 2.1 eV), [28,29] BiVO 4 (bandgap 2.4 eV), and α-Fe 2 O 3 (bandgap 2.1 eV). [30][31][32] However, many of these narrow bandgap materials suffer from poor chemical stability and sluggish interfacial charge injection. [33][34][35] As intrinsic semiconductor materials, both wide and narrow bandgap semiconductor photoanode materials are suffering from the poor bulk-phase carrier separation, intense surficial e − /h + trapping recombination, and sluggish electrode/electrolyte carrier injection kinetics. [36][37][38][39] Fortunately, with the continuous investment of researchers, a series of modification methods have been established and the PEC water oxidation performance of semiconductor photoanode materials has been significantly improved. [32,[40][41][42][43][44] Among various strategies, nanostructure-interface engineering is widely regarded as an effective method to improve the PEC water oxidation performance: [40,41] the light-harvesting performance can be enhanced by the widened optical Photoelectrochemical (PEC) water oxidation based on semiconductor materials plays an important role in the production of clean fuel and value-added chemicals. Nanostructure-interface engineering has proven to be an effective way to construct highly efficient PEC water oxidation photoanodes with good light capture, carrier transport, and ...

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Section: Principle Of Pec Water Oxidationmentioning

confidence: 99%

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

et al. 2021

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“…However, the radical formation capacity of the photocatalysts is rapidly reduced due to the fast recombination of photo-induced e cb − /h vb + pairs since the lifetime of e cb − /h vb + pairs is in the order of nanoseconds. Nevertheless, the recombination of photo-induced e cb − /h vb + pairs can be retarded by the external electrical potential [33]. In the PEC process, photocatalysts can be coated on the conductive supporting matrix (called as photo-anode).…”

Section: Principles Of Photo(electro)catalysismentioning

confidence: 99%

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

Yuan

Zheng

et al. 2021

Catalysts

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This article reviews the fundamental theories and reaction mechanisms of photocatalytic technologies with the assistance of electrical field for degrading multi-phase pollutants. Photo(electro)catalysis including photocatalytic oxidation (PCO) and photoelectrocatalytic oxidation (PECO) have been a potential technologies applied for the treatment of organic and inorganic compounds in the wastewaters and waste gases, which has been treated as a promising technique by using semiconductors as photo(electro)catalysts to convert light or electrical energy to chemical energy. Combining photocatalytic processes with electrical field is an option to effectively decompose organic and inorganic pollutants. Although photocatalytic oxidation techniques have been used to decompose multi-phase pollutants, developing efficient advanced oxidation technologies (AOTs) by combining photocatalysis with electrical potential is urgently demanded in the future. This article reviews the most recent progress and the advances in the field of photocatalytic technologies combined with external electrical field, including the characterization of nano-sized photo(electro)catalysts, the degradation of multi-phase pollutants, and the development of electrical assisted photocatalytic technologies for the potential application on the treatment of organic and inorganic compounds in the wastewaters and waste gases. Innovative oxidation techniques regarding photo(electro)catalytic reactions with and without oxidants are included in this review article.

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“…Modifying the photoelectrode with a hole transport layer (HTL) is another efficient way to boost the charge transfer process at the electrode top contact. [21] The rational construction of HTL on a semiconductor photoanode so that the photogenerated holes can efficiently transport from bulk to electrode surface, which has proven to be crucial in inhibiting the charge recombination, thereafter leading to a remarkable enhancement in the OER activities. Therefore, integrating semiconductor photoanode together with HTL and cocatalyst should be an ideal way for enhancing the surface kinetics, which would lead to excellent PEC performance of a photoelectrode.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrochemical Water Oxidation Performance in Bilayer TiO₂/α‐Fe₂O₃ Nanorod Arrays Photoanode with Cu : NiO_x as Hole Transport Layer and Co−Pi as Cocatalyst

Yin

et al. 2021

ChemSusChem

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Efficient charge transfer and excellent surface water oxidation kinetics are key factors in determining the photoelectrochemical (PEC) water splitting performance in photoelectrodes. Herein, a bilayer TiO 2 /α-Fe 2 O 3 nanorod (NR) arrays photoanode was prepared with deposited Cu-doped NiO x (Cu : NiO x ) hole transport layer (HTL) and CoÀ Pi oxygen evolution reaction (OER) cocatalyst for PEC water oxidation. The hierarchical TiO 2 / α-Fe 2 O 3 composite obtained by a secondary hydrothermal process exhibited an inapparent bilayer structure by embedding the underlayer TiO 2 NR arrays at the bottom part of the post-grown α-Fe 2 O 3 NR arrays. The underlayer TiO 2 NRs acted as an effective shuttling pathway for transferring photoelectrons generated in the upper hematite light absorber layer. A p-type inter-Cu : NiO x HTL was introduced to form a build-in p-n electric field between Cu : NiO x and α-Fe 2 O 3 NRs, which improved the hole extraction from α-Fe 2 O 3 to CoÀ Pi OER catalyst. As expected, the as-engineered TiO 2 /α-Fe 2 O 3 /Cu : NiO x / CoÀ Pi photoanode displayed an excellent photocurrent density of 2.43 mA cm À 2 at 1.23 V versus the reversible hydrogen electrode (V RHE ), up to 4.05 and 2.23 times greater than those of the bare α-Fe 2 O 3 (0.60 mA cm À 2 ) and TiO 2 /α-Fe 2 O 3 , respectively.The results demonstrate that the bottom-up engineering of electron-hole transport channels and cocatalyst modification is an attractive maneuver to enhance the PEC water oxidation activity in hematite and other photoanodes.

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An efficient hole transfer pathway on hematite integrated by ultrathin Al2O3 interlayer and novel CuCoOx cocatalyst for efficient photoelectrochemical water oxidation

Cited by 144 publications

References 45 publications

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

Enhanced Photoelectrochemical Water Oxidation Performance in Bilayer TiO₂/α‐Fe₂O₃ Nanorod Arrays Photoanode with Cu : NiO_x as Hole Transport Layer and Co−Pi as Cocatalyst

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An efficient hole transfer pathway on hematite integrated by ultrathin Al2O3 interlayer and novel CuCoOx cocatalyst for efficient photoelectrochemical water oxidation

Cited by 144 publications

References 45 publications

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

Enhanced Photoelectrochemical Water Oxidation Performance in Bilayer TiO2/α‐Fe2O3 Nanorod Arrays Photoanode with Cu : NiOx as Hole Transport Layer and Co−Pi as Cocatalyst

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Enhanced Photoelectrochemical Water Oxidation Performance in Bilayer TiO₂/α‐Fe₂O₃ Nanorod Arrays Photoanode with Cu : NiO_x as Hole Transport Layer and Co−Pi as Cocatalyst