A highly stable CuS and CuS–Pt modified Cu<sub>2</sub>O/CuO heterostructure as an efficient photocathode for the hydrogen evolution reaction

Dubale, Amare Aregahegn; Tamirat, Andebet Gedamu; Chen, Hung-Ming; Berhe, Taame Abraha; Pan, Chun‐Jern; Su, Wei‐Nien; Hwang, Bing‐Joe

doi:10.1039/c5ta09464j

Cited by 213 publications

(101 citation statements)

References 42 publications

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“…The charge transfer resistance ( R ct ) significantly decreases from a value of 101 kΩ cm (CuO photocathode) to 28 kΩ cm after incorporation of G‐COOH into CuO film, as shown in Nyquist plot ( Figure ). The reduction in R ct value shows an increase in charge transfer activity for the CuO:G‐COOH composite film, which is due to the presence of electron acceptor group.…”

Section: Resultsmentioning

confidence: 89%

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Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

et al. 2020

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Cupric oxide (CuO) is a promising candidate as a photocathode for visible‐light‐driven photo‐electrochemical (PEC) water splitting. However, the stability of the CuO photocathode against photo‐corrosion is crucial for developing CuO‐based PEC cells. This study demonstrates a stable and efficient photocathode through the introduction of graphene into CuO film (CuO:G). The CuO:G composite electrodes are prepared using graphene‐incorporated CuO sol–gel solution via spin‐coating techniques. The graphene is modified with two different types of functional groups, such as amine (NH2) and carboxylic acid (COOH). The COOH‐functionalized graphene incorporation into CuO photocathode exhibits better stability and also improves the photocurrent generation compare to control CuO electrode. In addition, COOH‐functionalized graphene reduces the conversion of CuO phase into cuprous oxide (Cu2O) during photo‐electrochemical reaction due to effective charge transfer and leads to a more stable photocathode. The reduction of CuO to Cu2O phase is significantly lesser in CuO:G‐COOH as compared to CuO and CuO:G‐NH2 photocathodes. The photocatalytic degradation of methylene blue (MB) by CuO, CuO:G‐NH2 and CuO:G‐COOH is also investigated. By integrating CuO:G‐COOH photocathode with a sol–gel‐deposited TiO2 protecting layer and Au–Pd nanostructure, stable and efficient photocathode are developed for solar hydrogen generation.

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Section: Resultsmentioning

confidence: 89%

“…Solar energy harvesting using photo‐electrochemical (PEC) water splitting is an emergent interest to convert solar energy into the fuel energy . The PEC water‐splitting technology requires semiconductor‐based photoelectrode to generate electron–hole pairs using solar light .…”

Section: Introductionmentioning

confidence: 99%

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

et al. 2020

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“…It was recently also used to deposit catalysts on semiconductor photoelectrodes to boost the PEC performance. For example, Hwang's group reported a Cu 2 O/CuO/CuS heterostructured photoelectrode, where CuS, as an electrocatalyst, was loaded on the Cu 2 O/CuO heterostructure via a SILAR approach . The authors used Cu(NO 3 ) 2 and Na 2 S as the source of Cu 2+ cations and S 2− anions, respectively, and found that only nine successive SILAR cycles could yield an optimal performance for light‐driven H 2 evolution ( Figure a).…”

Section: Strategies For Semiconductor/electrocatalyst Couplingmentioning

confidence: 99%

“…a) Fabrication of CuS on Cu 2 O/CuO photocathodes via a SILAR process . b) Chopped‐light J – V curve of Cu 2 O/CuO/CuS‐9‐Pt . c) J – V curves of Cu 2 O/CuO/CuS‐9‐Pt and the control samples.…”

Section: Strategies For Semiconductor/electrocatalyst Couplingmentioning

confidence: 99%

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

et al. 2020

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Hydrogen (H2) has a significant potential to enable the global energy transition from the current fossil‐dominant system to a clean, sustainable, and low‐carbon energy system. While presently global H2 production is predominated by fossil‐fuel feedstocks, for future widespread utilization it is of paramount importance to produce H2 in a decarbonized manner. To this end, photoelectrochemical (PEC) water splitting has been proposed to be a highly desirable approach with minimal negative impact on the environment. Both semiconductor light‐absorbers and hydrogen/oxygen evolution reaction (HER/OER) catalysts are essential components of an efficient PEC cell. It is well documented that loading electrocatalysts on semiconductor photoelectrodes plays significant roles in accelerating the HER/OER kinetics, suppressing surface recombination, reducing overpotentials needed to accomplish HER/OER, and extending the operational lifetime of semiconductors. Herein, how electrocatalyst coupling influences the PEC performance of semiconductor photoelectrodes is outlined. The focus is then placed on the major strategies developed so far for semiconductor/electrocatalyst coupling, including a variety of dry processes and wet chemical approaches. This Review provides a comprehensive account of advanced methodologies adopted for semiconductor/electrocatalyst coupling and can serve as a guideline for the design of efficient and stable semiconductor photoelectrodes for use in water splitting.

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“…On the other hand, the presence of co‐catalyst (CuO or CoO) improves the photocatalytic activity of hydrogen production, due to formation of the p‐n heterojunction that effectively separates charge carriers. It is worth mentioning that CuO and CoO played different roles during the process: while CoO is expected to catalyze the O 2 evolution reaction, CuO is expected to catalyze the H 2 evolution reaction . However, the improvement by coupling ST with CuO is considerably greater than that obtained when the material is modified with CoO, indicating that reduction reaction is the controlling step in the photocatalytic process.…”

Section: Resultsmentioning

confidence: 99%

SnO₂ -TiO₂ structures and the effect of CuO, CoO metal oxide on photocatalytic hydrogen production

Guerrero-Araque

Acevedo–Peña

Ramírez-Ortega

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND The technology for generating hydrogen using a photocatalyst has attracted considerable attention. Coupling TiO2 with other semiconductor oxides provided excellent results in decreasing recombination by transferring one of the charge carriers to another oxide. These photogenerated charge carriers play key roles in the reduction and oxidation process in photocatalytic hydrogen production. Nevertheless, even if the (e−‐h+) are separated, the reaction cannot happen without proper active sites. So, co‐catalysts are needed to improve the reduction and oxidation process on the surface of photocatalyst. RESULTS The hydrogen production of SnO2@TiO2 structure with CuO and CoO co‐catalysts (1 wt% of co‐catalyst: 1Co‐ST, 1Cu‐ST and 1Co‐1Cu‐ST) was studied under UV light, and characterized by XRD, N2 adsorption, UV‐vis reflectance diffuse, XPS and photoelectrochemical test. The dispersion of co‐catalyst on the surface of ST material during impregnation generates a decrease in the surface area and defect states in the optical properties. Maximum hydrogen production rate 1486.4 µmol g−1 h−1 is observed on 1Co‐1Cu‐ST photocatalyst. This improvement in photocatalytic reaction is related to the role played by each co‐catalyst. CONCLUSIONS The photocatalytic activity for H2 evolution shows the role of co‐catalyst in the redox reactions process. In the case of CuO co‐catalyst, it helps charge transfer, specifically electrons, to be carried out more efficiently by reducing water to produce H2. On the other hand, the role of CoO co‐catalyst is to catalyze the oxidation process, improving charge carriers separation and providing electrons to the SnO2@TiO2. © 2017 Society of Chemical Industry

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A highly stable CuS and CuS–Pt modified Cu₂O/CuO heterostructure as an efficient photocathode for the hydrogen evolution reaction

Abstract: A Cu2O/CuO heterostructure modified with CuS is proposed as a highly promising and stable photocathode for solar hydrogen production.

Cited by 213 publications

References 42 publications

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

SnO₂ -TiO₂ structures and the effect of CuO, CoO metal oxide on photocatalytic hydrogen production

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A highly stable CuS and CuS–Pt modified Cu2O/CuO heterostructure as an efficient photocathode for the hydrogen evolution reaction

Abstract: A Cu2O/CuO heterostructure modified with CuS is proposed as a highly promising and stable photocathode for solar hydrogen production.

Cited by 213 publications

References 42 publications

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

Nanoengineered Advanced Materials for Enabling Hydrogen Economy: Functionalized Graphene–Incorporated Cupric Oxide Catalyst for Efficient Solar Hydrogen Production

Strategies for Semiconductor/Electrocatalyst Coupling toward Solar‐Driven Water Splitting

SnO2 -TiO2 structures and the effect of CuO, CoO metal oxide on photocatalytic hydrogen production

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A highly stable CuS and CuS–Pt modified Cu₂O/CuO heterostructure as an efficient photocathode for the hydrogen evolution reaction

SnO₂ -TiO₂ structures and the effect of CuO, CoO metal oxide on photocatalytic hydrogen production