Enhanced piezoelectric-effect-assisted photoelectrochemical performance in ZnO modified with dual cocatalysts

Zhang, Shaoce; Liu, Zhifeng; Ruan, Mengnan; Guo, Zhengang; E, Lei; Zhao, Wei; Zhao, Dan; Wu, Xiang-Feng; Chen, Daimei

doi:10.1016/j.apcatb.2019.118279

Cited by 156 publications

(74 citation statements)

References 40 publications

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“…Based on UV‐vis measurements, the Tauc plots are achieved in order to evaluate the optical band gap according to the following equation [Eq. (2)]: [19,54]

true {((), α, h, ν)}^{n} = A (() h ν - E_{g})

…”

Section: Resultsmentioning

confidence: 99%

“…[8,9] Photoelectrochemical (PEC) water splitting is a promising method for converting endless solar energy into available hydrogen energy in an environmentally friendly way. [10][11][12][13] As the most important component of PEC water splitting, numerous photoelectrodes including n-type semiconductors and p-type semiconductors have been developed, such as TiO 2 , [14,15] BiVO 4 , [16,17] ZnO, [18,19] ZnIn 2 S 4 , [20,21] Fe 2 O 3 , [22,23] WO 3 , [24,25] CdS, [26,27] Cu 2 O [28,29] and CuO. [30,31] In particular, WO 3 has captured wide attention as an outstanding semiconductor photoanode among these photoelectrodes due to the moderate hole diffusion length of about 150 nm, satisfactory electron transmission capability of about 12 cm 2 V À 1 s À 1 and opportune band gap of 2.5~2.8 eV.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional WO₃/NiCo₂O₄ heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

et al. 2020

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The enhanced separation and injection efficiencies of photogenerated carriers is essential to improve the photoelectrochemical (PEC) performance of WO3 photoanode. In this work, we firstly synthesized WO3/NiCo2O4 heterojunction through simple hydrothermal‐annealing method as well as investigate the effect and mechanism of NiCo2O4 on WO3 for PEC performances. The measurements demonstrate that the nano‐needle NiCo2O4 grown on the surface of WO3 induces the bimetallic Ni/Co redox reaction sites extensively exposed to the electrolyte, which is beneficial to enhance the PEC performances of WO3 photoanode, such as photocurrent density improved by four times (0.84 mA/cm2 at 1.23 V vs. RHE) as well as more negative initial potential (∼280 mV) in contrast to bare WO3. Further investigation shows the remarkable enhancement of PEC performances is attributed to improved surface reaction kinetics, the enhanced injection efficiency and separation efficiency of photogenerated carriers due to the co‐catalyst effect of NiCo2O4 and the formation of WO3/NiCo2O4 heterojunction. This work provides reference for application of heterojunction with co‐catalyst function, which is beneficial to the development and application of similar structures.

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“…Based on UV‐vis measurements, the Tauc plots are achieved in order to evaluate the optical band gap according to the following equation [Eq. (2)]: [19,54]

true {((), α, h, ν)}^{n} = A (() h ν - E_{g})

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multifunctional WO₃/NiCo₂O₄ heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

et al. 2020

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“…After introducing ultrasonic, the efficiency of photon‐to‐current of bare ZnO under light irradiation was raised by two times. [ 169 ] Also the photocurrent density (Figure 18f) met a great promotion, which means the accelerated separation of charge carriers. The resistance of electrons transferred within ZnO and at the photoanode–electrolyte interface was reduced under ultrasonic.…”

Section: Piezo‐photocatalysismentioning

confidence: 97%

Section: Oxygen Activation and Water Decontaminationmentioning

confidence: 99%

Piezocatalysis and Piezo‐Photocatalysis: Catalysts Classification and Modification Strategy, Reaction Mechanism, and Practical Application

Guo

Zhang

et al. 2020

Adv Funct Materials

489

311

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Piezoelectric-based catalysis that relies on the charge energy or separation efficiency of charge carriers has attracted significant attention. The piezo-potential induced by strain or stress can induce a giant electric field, which has been demonstrated to be an effective means for charge energy shifting or transferring electrons and holes. In recent years, intense efforts have been made in this subject, and the research has mainly focussed on two aspects: i) Alteration of surface charge energy by piezo-potential in piezocatalysis; ii) the separation of photo-generated charge carriers and the catalytic activity enhancement of an integrated piezoelectric semiconductor or coupled system composed of piezoelectrics and semiconductors. Systematically summarizing the advances of the above two aspects is helpful in the context of deepening understanding of the relevant issues and developing new ideas for piezoelectric-based catalysis. In this review, a comprehensive summary on piezocatalysis and piezo-photocatalysis is provided. The charge transfer behaviors and catalytic mechanisms over a large variety of piezocatalysts and piezo-photocatalysts are systematically analyzed. In addition, the types of mechanical energy, strategies for enhancing piezocatalysis, and the advanced applications of piezocatalysis and piezophotocatalysis are discussed. Finally, the promising development directions of piezocatalysis and piezo-photocatalysis, such as materials, assembly forms, and applications in the future are proposed.

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“…The Mott-Schottky (MS) patterns of the nanocomposites are measured to investigate its at band potential and charge density, [44][45][46][47][48][49][50] as shown in Fig. 6c.…”

Section: Resultsmentioning

confidence: 99%

One-pot synthesis of Cu₂O/C@H-TiO₂ nanocomposites with enhanced visible-light photocatalytic activity

Jian

Wang

et al. 2019

RSC Adv.

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Enhanced piezoelectric-effect-assisted photoelectrochemical performance in ZnO modified with dual cocatalysts

Cited by 156 publications

References 40 publications

Multifunctional WO₃/NiCo₂O₄ heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

Multifunctional WO₃/NiCo₂O₄ heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

Piezocatalysis and Piezo‐Photocatalysis: Catalysts Classification and Modification Strategy, Reaction Mechanism, and Practical Application

One-pot synthesis of Cu₂O/C@H-TiO₂ nanocomposites with enhanced visible-light photocatalytic activity

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Enhanced piezoelectric-effect-assisted photoelectrochemical performance in ZnO modified with dual cocatalysts

Cited by 156 publications

References 40 publications

Multifunctional WO3/NiCo2O4 heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

Multifunctional WO3/NiCo2O4 heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

Piezocatalysis and Piezo‐Photocatalysis: Catalysts Classification and Modification Strategy, Reaction Mechanism, and Practical Application

One-pot synthesis of Cu2O/C@H-TiO2 nanocomposites with enhanced visible-light photocatalytic activity

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Multifunctional WO₃/NiCo₂O₄ heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

Multifunctional WO₃/NiCo₂O₄ heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

One-pot synthesis of Cu₂O/C@H-TiO₂ nanocomposites with enhanced visible-light photocatalytic activity