1D WO3 Nanorods/2D WO3−x Nanoflakes Homojunction Structure for Enhanced Charge Separation and Transfer towards Efficient Photoelectrochemical Performance

Li, Yanting; Liu, Zhifeng; Ruan, Mengnan; Guo, Zhengang; Li, Xifei

doi:10.1002/cssc.201902572

Cited by 51 publications

(13 citation statements)

References 40 publications

(46 reference statements)

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“…The semicircle diameters of WO 3 /R-CoO and WO 3 /B-CoO both in the dark and light are much smaller than that of WO 3 , indicating the better interface charge transfer after coupling with R-CoO (or B-CoO). The lower charge transfer resistance between WO 3 and R-CoO (or B-CoO) is consistent with the higher bulk charge separation efficiency (g bulk ) and surface charge separation efficiency (g surface ), which can be calculated using the following formulas: g bulk (%) = J sulfite /J abs and g surface (%) = J water /J sulfite (see the ESI for calculation details) [44,45]. The experiment was conducted in 0.5 M sodium sulfate (Na 2 SO 4 ) with adding 0.5 M sodium sulfite (Na 2 SO 3 ) as a hole scavenger, and the results are presented in Fig.…”

Section: Evaluation Of Pec Performancessupporting

confidence: 55%

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

2021

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Tungsten trioxide (WO 3 ) has been conceived as a promising photoanode material for photoelectrochemical (PEC) water oxidation. Therefore, many efforts have been made to improve its PEC performances. Herein, a novel heterojunction is fabricated through combining rocksalt CoO (R-CoO) or blende CoO (B-CoO) nanosheets with WO 3 nanoplates using a spin-coating method. The typical type II heterojunctions, e.g., WO 3 /R-CoO and WO 3 /B-CoO, both have exhibited higher photocurrent densities than pristine WO 3 photoanode. The photocurrent densities of WO 3 /R-CoO, WO 3 /B-CoO and WO 3 are 0.53 mA cm -2 , 0.45 mA cm -2 and 0.31 mA cm -2 at 1.23 V vs. reversible hydrogen electrode, respectively. For the WO 3 /R-CoO photoanode, the surface charge separation efficiency is 50.95% and the photoconversion efficiency is 0.062%, which are both higher than the WO 3 and WO 3 /B-CoO photoanodes. The enhanced PEC performances are due to the type II heterojunction between WO 3 and R-CoO (or B-CoO), which facilitates the absorption of visible light and charge transport. The better performance of WO 3 /R-CoO than that of WO 3 /B-CoO may be due to the deeper valence band position of R-CoO. Our work demonstrates that R-CoO (or B-CoO) can couple with WO 3 to form a type II heterojunction to improve the PEC water oxidation performance.

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Section: Evaluation Of Pec Performancessupporting

confidence: 55%

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

2021

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“…In the photoelectrochemical (PEC) processes, photon utilization and charge separation are two of the most important factors affecting the overall energy conversion efficiency. Recently, various strategies have been reported to enhance photon absorption and electron-hole separation efficiency, such as constructing multijunction structure [19][20][21], tuning crystal facets [22][23][24], as well as defect engineering [25][26][27]. Although promising PEC performances have been achieved, the charge transfer mechanisms remain unclear and are still under debate in many cases [28,29].…”

Section: Introductionmentioning

confidence: 99%

Interface-modulated nanojunction and microfluidic platform for photoelectrocatalytic chemicals upgrading

Liu

et al. 2021

Applied Catalysis B: Environmental

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Photoelectrocatalytic oxidation provides a technically applicable way for solar-chemical synthesis, but its efficiency and selectivity are moderate. Herein, a microfluidic photoelectrochemical architecture with 3-D microflow channels is constructed by interfacial engineering of defective WO3/TiO2 heterostructures on porous carbon fibers. Kelvin probe force microscopy and photoluminescence imaging visually evidence the charge accumulation sites on the nanojunction. This efficient charge separation contributes to 3-fold enhancement in the yield of glyceraldehyde and 1,3-dihydroxyacetone during glycerol upgrading, together with nearly doubled production of high value-added KA oil and S2O8 2− oxidant through cyclohexane and HSO4 − oxidization, respectively. More importantly, the microfluidic platform with enhanced mass transfer exhibits a typical reaction selectivity of 85%, which is much higher than the conventional planar protocol. Integrating this microfluidic photoanode with an oxygen reduction cathode leads to a self-sustained photocatalytic fuel cell with remarkably high open-circuit voltage (0.9 V) and short-circuit current (1.2 mA cm −2 ).

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“…In recent years, several modification measures for PEC performances of WO 3 have been implemented in order to maximize the advantages of WO 3 photoanode, which include preparation of different nanostructures, [34,35] construction of heterojunctions as well as homojunctions [36,37] and doping of metallic or non-metallic elements. [38,39] Among these methods, the construction of heterojunctions formed by the coupling of WO 3 and a semiconductor with smaller band gap is considerably promising, which not only increases light absorption due to the small band gap semiconductor as light absorber, but also facilitates the separation of carriers.…”

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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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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1D WO₃ Nanorods/2D WO_3−x Nanoflakes Homojunction Structure for Enhanced Charge Separation and Transfer towards Efficient Photoelectrochemical Performance

Abstract: Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 51 publications

References 40 publications

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

Interface-modulated nanojunction and microfluidic platform for photoelectrocatalytic chemicals upgrading

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

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1D WO3 Nanorods/2D WO3−x Nanoflakes Homojunction Structure for Enhanced Charge Separation and Transfer towards Efficient Photoelectrochemical Performance

Abstract: Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 51 publications

References 40 publications

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

Interface-modulated nanojunction and microfluidic platform for photoelectrocatalytic chemicals upgrading

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

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1D WO₃ Nanorods/2D WO_3−x Nanoflakes Homojunction Structure for Enhanced Charge Separation and Transfer towards Efficient Photoelectrochemical Performance

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