Boosting water oxidation performance of CuWO4 photoanode by surface modification of nickel phosphate

Xiong, Xianqiang; Fan, Liya; Chen, Guihua; Wang, Yong; Wu, Chenglin; Chen, Dan; Lin, Yan; Li, Tianding; Fu, Shuai; Ren, Shi‐Bin

doi:10.1016/j.electacta.2019.135125

Cited by 23 publications

(13 citation statements)

References 41 publications

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“…70% increase over that of CuWO 4 (0.32 mA•cm −2 ). However, no obvious shift of the OER onset potential is observed, which is also found in other reports on cocatalyst-modified CuWO 4 [26,[39][40][41]. This indicates that the charge-transfer resistance around the onset potential range is quite large and thus even an OER cocatalyst fails to effectively accelerate the charge transfer.…”

Section: Photoactivity and Photostability Of Cuwo4 And Cuwo4/irco-pi ...supporting

confidence: 77%

“…Note that, in Ref. [40,41], although the authors named the photoanode CuWO 4 , it actually was, as the authors mentioned in the articles, a mixture of WO 3 and CuWO 4 based on the XRD data where unique WO 3 peaks at ca. 33.2 • can be clearly seen.…”

Section: Photoactivity and Photostability Of Cuwo4 And Cuwo4/irco-pi ...mentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) measurements were conducted under illumination to explore the reasons for the enhanced photoactivity. As shown in Figure 5d, only one semicircle is presented for both the bare CuWO 4 and cocatalyst-modified CuWO 4 , therefore, a simple but typical Randel's circuit (inset in Figure 5d) was used to interpret the obtained EIS data [21,40,41,49,50]. The equivalent circuit consists of the series resistance (R s ), the constant phase element (CPE) and the charge-transfer resistance (R ct ).…”

Section: Interfacial Charge-transfer Behavior Of Cuwo 4 and Cuwo 4 /I...mentioning

confidence: 99%

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Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Diao

2020

Catalysts

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Severe interfacial electron–hole recombination greatly limits the performance of CuWO4 photoanode towards the photoelectrochemical (PEC) oxygen evolution reaction (OER). Surface modification with an OER cocatalyst can reduce electron–hole recombination and thus improve the PEC OER performance of CuWO4. Herein, we coupled CuWO4 nanoflakes (NFs) with Iridium–cobalt phosphates (IrCo-Pi) and greatly improved the photoactivity of CuWO4. The optimized photocurrent density for CuWO4/IrCo-Pi at 1.23 V vs. reversible hydrogen electrode (RHE) rose to 0.54 mA∙cm−2, a ca. 70% increase over that of bare CuWO4 (0.32 mA∙cm−2). Such improved photoactivity was attributed to the enhanced hole collection efficiency, which resulted from the reduced charge-transfer resistance via IrCo-Pi modification. Moreover, the as-deposited IrCo-Pi layer well coated the inner CuWO4 NFs and effectively prevented the photoinduced corrosion of CuWO4 in neutral potassium phosphate (KPi) buffer solution, eventually leading to a superior stability over the bare CuWO4. The facile preparation of IrCo-Pi and its great improvement in the photoactivity make it possible to design an efficient CuWO4/cocatalyst system towards PEC water oxidation.

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Section: Photoactivity and Photostability Of Cuwo4 And Cuwo4/irco-pi ...supporting

confidence: 77%

Section: Photoactivity and Photostability Of Cuwo4 And Cuwo4/irco-pi ...mentioning

confidence: 99%

Section: Interfacial Charge-transfer Behavior Of Cuwo 4 and Cuwo 4 /I...mentioning

confidence: 99%

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Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Diao

2020

Catalysts

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Section: Introductionmentioning

confidence: 70%

“…We and others have found that catalysts often do not influence the photocurrent onset potential and, in some cases, decrease the activity toward water oxidation reaction. We note, however, that there are a few reports that suggest moderate improvement of CuWO 4 photoanodes after electrocatalyst deposition for PEC water oxidation 15,21,30,31 In this work, we provide new insight into the charge-carrier dynamics at the CuWO 4 /electrocatalyst interface using DWE photoelectrochemistry. Ni 0.75 Fe 0.25 O y (Ni75) was chosen as a model electrocatalyst to probe the interface due to the high electrocatalytic activity for the water oxidation reaction.…”

Section: ■ Introductionmentioning

confidence: 91%

Charge-Carrier Dynamics at the CuWO₄/Electrocatalyst Interface for Photoelectrochemical Water Oxidation

Shadabipour

Raithel

Hamann

2020

ACS Appl. Mater. Interfaces

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Unraveling the charge-carrier dynamics at electrocatalyst/electrode interfaces is critical for the development of efficient photoelectrochemical (PEC) water oxidation. Unlike the majority of photoanodes investigated for PEC water oxidation, the integration of electrocatalysts with CuWO4 electrodes generally results in comparable or worse performance compared to the bare electrode. This is despite the fact that the surface state recombination limits the water oxidation efficiency with CuWO4 electrodes, and an electrocatalyst ought to bypass this reaction and improve performance. Here, we present results that deepen the understanding of the energetics and electron-transfer processes at the CuWO4/electrocatalyst interface, which controls the performance of such systems. Ni0.75Fe0.25O y (denoted as Ni75) was chosen as a model electrocatalyst, and through dual-working electrode experiments, we have been able to provide significant insight into the role of the electrocatalyst on the charge-transfer process at the CuWO4/Ni75 interface. We have shown a lack of performance improvement for CuWO4/Ni75 relative to the bare electrode to water oxidation. We attribute this surprising result to water oxidation on the CuWO4 surface kinetically outcompeting hole transfer to the Ni75 electrocatalyst interface.

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Self‐Assembled Urchin‐Like CuWO₄/WO₃ Heterojunction Nanoarrays as Photoanodes for Photoelectrochemical Water Splitting

et al. 2020

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With attractive visible‐light response and chemical stability, CuWO4 has emerged to be a promising candidate as a photoanode for photoelectrochemical (PEC) water oxidation. In this work, we report a one‐step hydrothermal method to prepare CuWO4‐based films directly grown on a conductive glass substrate from a stable precursor solution. By controlling the reaction duration, CuWO4/WO3 heterojunctions with urchin‐like nanoarray morphology are obtained. The CuWO4/WO3 film obtained with an optimized hydrothermal reaction time exhibits an onset potential of 0.6 V and a photocurrent density of 0.48 mA cm−2 at 1.23 V vs. RHE, which is almost five times that of bare CuWO4. The superior structure of the urchin‐like array with large surface area, optimizing film thickness for adequate light absorption and formation of heterojunctions for efficient charge separation conjointly, contributes to the improved performance as well as robust stability.

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Boosting water oxidation performance of CuWO4 photoanode by surface modification of nickel phosphate

Cited by 23 publications

References 41 publications

Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Charge-Carrier Dynamics at the CuWO₄/Electrocatalyst Interface for Photoelectrochemical Water Oxidation

Self‐Assembled Urchin‐Like CuWO₄/WO₃ Heterojunction Nanoarrays as Photoanodes for Photoelectrochemical Water Splitting

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Boosting water oxidation performance of CuWO4 photoanode by surface modification of nickel phosphate

Cited by 23 publications

References 41 publications

Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Charge-Carrier Dynamics at the CuWO4/Electrocatalyst Interface for Photoelectrochemical Water Oxidation

Self‐Assembled Urchin‐Like CuWO4/WO3 Heterojunction Nanoarrays as Photoanodes for Photoelectrochemical Water Splitting

Contact Info

Product

Resources

About

Charge-Carrier Dynamics at the CuWO₄/Electrocatalyst Interface for Photoelectrochemical Water Oxidation

Self‐Assembled Urchin‐Like CuWO₄/WO₃ Heterojunction Nanoarrays as Photoanodes for Photoelectrochemical Water Splitting