Construction of ZnO@NiO heterostructure photoelectrodes for improved photoelectrochemical performance

Sahoo, Pooja; Sharma, Akash; Padhan, Subash

doi:10.1016/j.ijhydene.2021.08.154

Cited by 18 publications

(18 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As it can be seen from the figure, the arc radius of the EIS Nyquist diagram of the OZN-10 composite is smaller than that of ZN-10 and pure ZnO, indicating that the OZN-10 composite has a higher photogenerated carrier separation efficiency and synergistic effect of oxygen vacancy and heterojunction generated by NiO. It is known that a high electron hole separation efficiency leads to a higher photocatalytic activity, which means that NiO composites have a stronger photocatalytic performance than other samples [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Zhang

2022

Nanomaterials

View full text Add to dashboard Cite

In this paper, ZnO/NiO composites rich in oxygen vacancies are prepared by the solvothermal method and reduction method. In the test, through the use of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM), diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and electron paramagnetic resonance (EPR), we effectively prove the existence of phase, morphology and oxygen vacancies in the material. Through the photocatalysis test and gas sensitivity test, it is found that 10% Ni doped OZN-10 has the best photocatalytic activity and gas sensitivity characteristics. The degradation rate of methylene blue (MB) was 98%. The gas sensitivity test shows that OZN-10 has good selectivity, good response performance (3000 ppm, 27,887%) and excellent response recovery time (response time: 50 s, recovery time: 5–7 s) for saturated NH3 gas at standard atmospheric pressure (101.325 KPa) and room temperature (25 °C). The synergistic effect of oxygen vacancy as the center of a trap and p–n heterojunction forming an electric potential field at the interface is explained, and the mechanism of improving photocatalysis and gas sensitivity is analyzed. This work will provide an innovative vision for dual-performance oxygen vacancy modification of heterojunctions through photocatalysis.

show abstract

Section: Resultsmentioning

confidence: 99%

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Zhang

2022

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Sahoo et al constructed a p−n ZnO/NiO heterostructure junction, in which the photocurrent density can reach −1.28 mA cm −2 at 1.2 V (vs Ag/AgCl) under visible light irradiation. 41 To improve the PEC performance of ZnO, another obstacle to overcome is the photocorrosion phenomenon. Under light irradiation, ZnO may undergo the following reactions, which dramatically affect the stability of the photoelectrode 55…”

Section: Zno 311 Absorption Of Light and Photocorrosionmentioning

confidence: 99%

“…Therefore, improving the light absorption efficiency is the first challenge to develop ZnO-based photocatalysts. The common strategies include doping metal and/or nonmetal elements and constructing heterostructures. − Doping with metal ions creates impurity levels below the conduction band or above the valence band acting as donor or acceptor levels, respectively, which eventually narrows the bandgaps of the semiconductors. Elements in Group IB (Cu, Ag, and Au) of the periodic table, which possess low solubility and self-compensation, can be used as acceptors for p-type ZnO.…”

Section: Zinc-based Materials Applied In the Pec Co2 Reductionmentioning

confidence: 99%

“…Doping nonmetal elements such as C, N, and Cl to replace a part of the O atoms in the lattices of ZnO can also narrow the bandgap and enhance the absorption of visible light. ,,, According to density functional theory (DFT) calculations, doping can facilitate the excitation of electrons by increasing the electron density of reaction sites and introducing vacant states into the bandgap . Wang et al found that N-doped ZnO can absorb visible light, and the photocurrent at 1.1 V (vs SCE) under 100 mW cm –2 illumination is twice as high as that of the undoped ones .…”

Section: Zinc-based Materials Applied In the Pec Co2 Reductionmentioning

confidence: 99%

See 1 more Smart Citation

Zinc-Based Materials for Photoelectrochemical Reduction of Carbon Dioxide

Wang

Ning

et al. 2022

Energy Fuels

View full text Add to dashboard Cite

As one of the most effective ways to convert carbon dioxide (CO 2 ) into fuels and/or high-value-added chemicals, photoelectrochemical (PEC) reduction of CO 2 will potentially alleviate both the environment and energy crises. Zinc-based materials are ideal PEC catalysts due to their variable energy band structures, wide sources, and environmental friendliness. However, the achievements and developmental trends of zinc-based PEC catalysts for CO 2 reduction have not been systematically summarized. In this review, the principles of PEC CO 2 reduction are briefly introduced. Various zinc-based PEC catalysts, including ZnO, Cu 2 ZnSnS 4 , Cu 2 ZnGeS 4 , ZnSe, ZnTe, Zn alloys, and a zinc porphyrin complex, for the reduction of CO 2 are summarized. The challenges and future developing trends of these zinc-based PEC catalysts are prospected.

show abstract

“…Along with the advantages, zinc oxide has a serious disadvantage, which manifests itself in uncontrollable conductivity [ 41 , 42 ]. To solve this problem, a number of strategies have been proposed, such as a variation in the methods of synthesis [ 43 ] and obtaining double [ 44 ] and ternary structures [ 45 , 46 ]. As a rule, ZnO needs enhanced light collection due to its wide band gap.…”

Section: Photoelectrodesmentioning

confidence: 99%

Operando Photo-Electrochemical Catalysts Synchrotron Studies

et al. 2022

View full text Add to dashboard Cite

The attempts to develop efficient methods of solar energy conversion into chemical fuel are ongoing amid climate changes associated with global warming. Photo-electrocatalytic (PEC) water splitting and CO2 reduction reactions show high potential to tackle this challenge. However, the development of economically feasible solutions of PEC solar energy conversion requires novel efficient and stable earth-abundant nanostructured materials. The latter are hardly available without detailed understanding of the local atomic and electronic structure dynamics and mechanisms of the processes occurring during chemical reactions on the catalyst–electrolyte interface. This review considers recent efforts to study photo-electrocatalytic reactions using in situ and operando synchrotron spectroscopies. Particular attention is paid to the operando reaction mechanisms, which were established using X-ray Absorption (XAS) and X-ray Photoelectron (XPS) Spectroscopies. Operando cells that are needed to perform such experiments on synchrotron are covered. Classical and modern theoretical approaches to extract structural information from X-ray Absorption Near-Edge Structure (XANES) spectra are discussed.

show abstract

Construction of ZnO@NiO heterostructure photoelectrodes for improved photoelectrochemical performance

Cited by 18 publications

References 48 publications

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Zinc-Based Materials for Photoelectrochemical Reduction of Carbon Dioxide

Operando Photo-Electrochemical Catalysts Synchrotron Studies

Contact Info

Product

Resources

About