A high performance p-type nickel oxide/cuprous oxide nanocomposite with heterojunction as the photocathodic catalyst for water splitting to produce hydrogen

Liu, Aijuan; Zhu, Yongcheng; Li, Kezhen; Chu, Dongmei; Huang, Jie; Li, Xia; Zhang, Chunyong; Yang, Ping; Du, Yukou

doi:10.1016/j.cplett.2018.05.020

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…As a powerful and inexhaustible renewable energy source, solar energy is considered as one of the best methods to mitigate these problems. It can be exploited and utilized for energy production (for example H 2 [ 3 , 4 , 5 , 6 ], hydrocarbon fuel [ 7 , 8 ] and electric energy [ 9 , 10 ] production) and removal of pollutants (such as CO 2 [ 11 , 12 , 13 , 14 , 15 ], organic contaminants in water [ 16 , 17 , 18 , 19 , 20 , 21 ] or air [ 22 , 23 , 24 , 25 , 26 ], emerging micropollutants [ 27 , 28 ]) by using photocatalytic, photovoltaic and other light-conversion technologies [ 29 , 30 ]. As one of the most promising light conversion technologies, photocatalytic technology only needs the appropriate semiconductor photocatalyst and solar energy as energy input.…”

Section: Introductionmentioning

confidence: 99%

A Mini Review on Bismuth-Based Z-Scheme Photocatalysts

Chen

Jian-rong

et al. 2020

Materials

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Recently, the bismuth-based (Bi-based) Z-scheme photocatalysts have been paid great attention due to their good solar energy utilization capacity, the high separation rate of their photogenerated hole-electron pairs, and strong redox ability. They are considerably more promising materials than single semiconductors for alleviating the energy crisis and environmental deterioration by efficiently utilizing sunlight to motivate various photocatalytic reactions for energy production and pollutant removal. In this review, the traits and recent research progress of Bi-based semiconductors and recent achievements in the synthesis methods of Bi-based direct Z-scheme heterojunction photocatalysts are explored. The recent photocatalytic applications development of Bi-based Z-scheme heterojunction photocatalysts in environmental pollutants removal and detection, water splitting, CO2 reduction, and air (NOx) purification are also described concisely. The challenges and future perspective in the studies of Bi-based Z-scheme heterojunction photocatalysts are discussed and summarized in the conclusion of this mini review.

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Section: Introductionmentioning

confidence: 99%

A Mini Review on Bismuth-Based Z-Scheme Photocatalysts

Chen

Jian-rong

et al. 2020

Materials

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“…Based on the estimation of band position values, electron transmission is possible between CB of Cu 2 O and CB of NiO. These electrons are subsequently transported to CuO’s CB for further chemical reaction. − The electrons further migrate to the interface for water splitting to form hydrogen, which has been expressed in the following eqs –. The development of the heterojunction between the CuO and Cu 2 O phases in the photocatalyst nanocomposite also boosted the lifetime of the excitons due to the segregation of electrons and holes, resulting in increased photocatalytic activity, as observed through photoluminescence spectra.…”

Section: Resultsmentioning

confidence: 99%

New Insights into Cu/Cu₂O/CuO Nanocomposite Heterojunction Facilitating Photocatalytic Generation of Green Fuel and Detoxification of Organic Pollutants

et al. 2023

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Cu/Cu 2 O/CuO nanocomposites were synthesized using the simple wet chemical approach for the production of dihydrogen as a potential fuel source and for the detoxification of dyes. The formation of Cu/Cu 2 O/ CuO nanocomposites is confirmed by powder X-ray diffraction, whereas the W-H plot revealed the average particle size of nanocomposite approximately 17 nm, which is in good agreement with the Scherrer method and transmission electron microscopy analysis. The uniform distribution of Cu and O elements was supported by the elemental mapping of the nanocomposite. Band gaps of CuO and Cu 2 O were found to be 1.71 and 1.92 eV, respectively, using diffuse reflectance spectroscopy spectra and Kubelka−Munk functions. The oxygen vacancies in the nanocomposite are confirmed by various analytical spectroscopic techniques, such as electron paramagnetic resonance, Raman, photoluminescence, and X-ray photoelectron spectroscopy (XPS) spectra. The significant boost in the performance of the fabricated nanocomposite was observed and is attributed to the formation of a heterojunction and existence of oxygen vacancy. The nanocomposite demonstrated proficiency in the photocatalytic splitting of water for the production of hydrogen. The maximum hydrogen generation yield (68 μmol g −1 ) was observed for Cu/Cu 2 O/CuO nanocomposites along with NiO (co-catalyst) and methanol as a hole scavenger as well as an electron donor. Moreover, the degradation of congo red (CR) and malachite green (MG) dyes was also investigated and the efficiency of the nanocomposite was found to be 80 and 60%, respectively, after 120 min of light irradiation. The stability of nanocomposites after photocatalysis was investigated by the XPS spectrum of the nanocomposite. Explicitly, the area and broadening of the O 1s XPS spectrum demonstrated higher degradation of CR dye as compared to MG dye.

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“…This is important for these devices as they will be subject to cyclic heating and cooling. Similar experiments should be carried out for each specific application of nickel hydroxides, for example, if they are used as precursors to form electrodes on which hydrogen evolution is carried out [34]. In this case, further development of the preparation of multifunctional nickel hydroxide films based can be the production of mesoporous deposits using surfactants [35].…”

Section: Electrochemical and Electrochromic Characteristics Of Depositsmentioning

confidence: 99%

Efficiency definition of the deposition process of electrochromic Ni(OH)2-PVA films formed on a metal substrate from concentrated solutions

Kotok¹,

Кovalenko

Nafeev

et al. 2021

EEJET

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Electrochemical devices based on nickel hydroxide electrodes are used in different areas. The main ones are chemical current sources, variable transparency “smart” windows, devices for carrying out electrocatalytic reactions, sensors for determining various substances. In this regard, methods of nickel hydroxide synthesis are of great interest, especially those that allow forming nickel hydroxide directly on the surface of electrodes. One of these methods is electrochemical deposition with cathodic current polarization. The available information on nickel hydroxide synthesis from nickel solutions was considered. It was shown that the available data mainly covered information on dilute solutions from 0.01 to 0.25 mol/L Ni(NO3)2. In addition, no comparison was found in the literature for the efficiency of the cathodic formation of Ni(OH)2 at different concentrations of nickel nitrate. To eliminate the lack of information, the dependence of the current efficiency on the concentration of nickel nitrate in the electrodeposition solution was determined at a constant cathode current density of 0.625 mA/cm2. The resulting dependence decreased nonlinearly with increasing concentration. The nickel hydroxide deposit formed in this case had an X-ray amorphous structure, and it depended little on the Ni(NO3)2 concentration. In addition, the current efficiency reached zero at concentrations of 1.5 mol/L Ni(NO3)2 and higher. However, with polyvinyl alcohol in the solution and at Ni(NO3)2 concentrations of 1.5 and 2 mol/L, electrochemically and electrochromically active Ni(OH)2 films were deposited. The current efficiency calculated indirectly for 1.5 and 2 mol/L Ni(NO3)2 solutions was 3.2 and 2.3 %, respectively. Thus, it was concluded that polyvinyl alcohol affected the mechanism of nickel hydroxide electrodeposition from aqueous solutions of nickel nitrate.

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A high performance p-type nickel oxide/cuprous oxide nanocomposite with heterojunction as the photocathodic catalyst for water splitting to produce hydrogen

Cited by 13 publications

References 28 publications

A Mini Review on Bismuth-Based Z-Scheme Photocatalysts

A Mini Review on Bismuth-Based Z-Scheme Photocatalysts

New Insights into Cu/Cu₂O/CuO Nanocomposite Heterojunction Facilitating Photocatalytic Generation of Green Fuel and Detoxification of Organic Pollutants

Efficiency definition of the deposition process of electrochromic Ni(OH)2-PVA films formed on a metal substrate from concentrated solutions

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A high performance p-type nickel oxide/cuprous oxide nanocomposite with heterojunction as the photocathodic catalyst for water splitting to produce hydrogen

Cited by 13 publications

References 28 publications

A Mini Review on Bismuth-Based Z-Scheme Photocatalysts

A Mini Review on Bismuth-Based Z-Scheme Photocatalysts

New Insights into Cu/Cu2O/CuO Nanocomposite Heterojunction Facilitating Photocatalytic Generation of Green Fuel and Detoxification of Organic Pollutants

Efficiency definition of the deposition process of electrochromic Ni(OH)2-PVA films formed on a metal substrate from concentrated solutions

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New Insights into Cu/Cu₂O/CuO Nanocomposite Heterojunction Facilitating Photocatalytic Generation of Green Fuel and Detoxification of Organic Pollutants