CuO<sub>x</sub>‐TiO<sub>2</sub> Composites: Electronically Integrated Nanocomposites for Solar Hydrogen Generation

Bharad, Pradnya A.; Nikam, Arun V.; Thomas, Femi; Gopinath, Chinnakonda S.

doi:10.1002/slct.201802047

Cited by 37 publications

(23 citation statements)

References 61 publications

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“…First, 10% Cu 2 O was loaded onto the TiO 2 surface through a conventional photodeposition method, which used simulated sunlight for illumination (see experimental section in Supporting Information). − After the loading process, the typical red suspension was obtained, as shown in Figure S1. Next, 2% of the Pt precursor (H 2 PtCl 6 ) was added into this solution and treated again with illumination.…”

Section: Resultsmentioning

confidence: 99%

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO₂ Photocatalytic Solar-Fuel Production

Liu

Yang

et al. 2020

ACS Sustainable Chem. Eng.

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Photocatalytic water splitting for the production of H 2 and the reduction of CO 2 into carbon compounds via solar energy exhibits possible widespread applications in the energy sector because of their application as so-called solar fuels. However, so far, the efficiency of these processes is low and in need of further improvement. Herein, we report a strategy for boosting the solar fuel generation rate of TiO 2 by loading cocatalysts, specifically bimetallic Cu−Pt and CuO, via two-step photodeposition processes. Intriguingly, we can for the first time observe that the Cu 2 O nanoparticles present on the surface of TiO 2 are partially redissolved into the solution because of the weak acidity induced by the Pt precursor. The sample of Cu− Pt/TiO 2 −CuO shows a photocatalytic H 2 generation rate of 173.7 μmol/g•h under simulated sunlight conditions. For the photocatalytic CO 2 reduction by water, the sample of Cu−Pt/TiO 2 −CuO shows the release of H 2 , O 2 , CO, CH 4 , and CH 3 OH, whereby CO is the main reaction product. Typically, the yields of O 2 and CO are 4.2 and 6.2 and 2.1 and 3.2 μmol/h•g under LED-405 and LED-425, respectively; the CO 2 -to-CO conversion ratios with respect to separated carriers are 73.8 and 76.19%.

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Section: Resultsmentioning

confidence: 99%

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO₂ Photocatalytic Solar-Fuel Production

Liu

Yang

et al. 2020

ACS Sustainable Chem. Eng.

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“…However, its large band gap (3.2 eV suitable for UV light) and inability to absorb visible light largely reduce its inherent catalytic efficiency. In order to improve its catalytic efficiency, different strategies such as plasmonic metal nanoparticles (NPs) incorporation, nonmetal doping (TiO 2– x N x ), composite formation with other suitable semiconductors, and so on have been practiced extensively. − Also, use of a sacrificial reagent significantly enhances the solar H 2 evolution reaction by consuming the holes . In addition, dispersion of cocatalyst/metal NPs over TiO 2 surface is known to form a Schottky junction at their interfaces that play a critical role in charge separation and results better activity .…”

Section: Introductionmentioning

confidence: 99%

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Tudu

Nalajala

Reddy

et al. 2021

ACS Sustainable Chem. Eng.

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Developing highly efficient and affordable catalysts for solar hydrogen (H2) generation is crucial, and employing a cocatalyst from earth-abundant elements has a critical role to play. In this context, different compositions of earth-abundant Ni–Fe alloy (1:1, 1:3, and 3:1) have been prepared by hydrothermal method; subsequently, 1 wt % of these Ni–Fe cocatalysts were integrated with TiO2-P25 and thoroughly characterized. The resultant catalysts have been evaluated for solar H2 production, in powder and thin film forms, under one sun condition and in direct sunlight. Interestingly, all the catalysts in the thin film form exhibit superior hydrogen yield (HY), up to 27 times higher activity than its powder counterpart. Among the photocatalysts, Ni–Fe/TiO2 (3:1 = Ni/Fe; NFT31) composition exhibits the best HY in thin film (8.27 mmol·h–1·g–1) and exceeds all other compositions of catalyst. It is also to be reported that HY measured for the powder form with 1 mg shows 3–17 times higher activity than that measured with 25 mg. This is mainly attributed to effective solar light absorption with a smaller amount of photocatalyst either spread over large area in a thin film form or well-dispersed in suspension forms. Furthermore, the enhanced activity obtained with Ni–Fe/TiO2 photocatalysts is also ascribed to strong electronic integration of Ni–Fe cocatalyst with TiO2 and higher performance obtained with a thin film is attributed to increased charge carrier generation and subsequent charge separation and effective utilization. A decrease in work function of TiO2 by 0.6 eV was observed after its integration with cocatalyst in NFT31.

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“…Currently, the most common optimization scheme is to use precious metal materials as the base of semiconductors, use their chemical stability, and provide a good interface for electrocatalysis. For example, some research scholars have used Ag 2 S as a precursor [80]. In addition, different precious metals can combine with epitaxial growth technology.…”

Section: Electric Catalysismentioning

confidence: 99%

“…TiO 2 Nanosheets Photocatalytic hydrogen production [17,74] CuOx-TiO 2 Solar hydrolysis [80] Ni-Zn/TiO 2 (9:1) Photocatalytic hydrogen production [88] TiO 2 /WO 3 /Au/MWCNT Photocatalytic hydrogen production [82] CdS-CTF-1 Photocatalytic hydrogen production [77] 0D ZAIS CQD and 2D MoS 2 Photocatalytic hydrogen production [89] MoS 2 /Graphene Electrocatalytic oxygen production [50] CoNiO x /rGO Electrocatalytic oxygen production [20] FeNi 2 Se 4 -NrGO Bifunctional catalyst for OER and ORR [80] MoS 2 /N-RGO-180 Electrocatalytic oxygen production [90] Fe(Ni)-MOF Electrocatalytic oxygen production [33] Manganese copper sulfide (MCS) Photocatalytic and electrocatalytic hydrolysis [39] PRh/ZnO/Ni/Pt Methanol oxidation [68] With the vigorous research and development of new materials, nanomaterials have advantages in water pollution control, such as the presence of surface effects, which increases their specific surface area [91,92]. In addition, large and enhanced surface activity and small size effects can effectively enhance their adsorption capacity [3,30,93].…”

Section: Nanomaterials Function Referencesmentioning

confidence: 99%

“… Nanomaterials themselves are corroded in the environment, resulting in short service life. To achieve the long-term use of nanomaterials, the circulation of active ingredients flowing into the environment and the development of corrosion-resistant materials are particularly important development directives for regenerating nanomaterials [ 80 ]. …”

Section: Existing Research Problems and Future Research Directionsmentioning

confidence: 99%

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Oxygen Reduction Reaction in the Field of Water Environment for Application of Nanomaterials

Xie

Alhassan

et al. 2020

Nanomaterials

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Water pollution has caused the ecosystem to be in a state of imbalance for a long time. It has become a major global ecological and environmental problem today. Solving the potential hidden dangers of pollutants and avoiding unauthorized access to resources has become the necessary condition and important task to ensure the sustainable development of human society. To solve such problems, this review summarizes the research progress of nanomaterials in the field of water aimed at the treatment of water pollution and the development and utilization of new energy. The paper also tries to seek scientific solutions to environmental degradation and to create better living environmental conditions from previously published cutting edge research. The main content in this review article includes four parts: advanced oxidation, catalytic adsorption, hydrogen, and oxygen production. Among a host of other things, this paper also summarizes the various ways by which composite nanomaterials have been combined for enhancing catalytic efficiency, reducing energy consumption, recycling, and ability to expand their scope of application. Hence, this paper provides a clear roadmap on the status, success, problems, and the way forward for future studies.

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CuO_x‐TiO₂ Composites: Electronically Integrated Nanocomposites for Solar Hydrogen Generation

Cited by 37 publications

References 61 publications

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO₂ Photocatalytic Solar-Fuel Production

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO₂ Photocatalytic Solar-Fuel Production

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Oxygen Reduction Reaction in the Field of Water Environment for Application of Nanomaterials

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CuOx‐TiO2 Composites: Electronically Integrated Nanocomposites for Solar Hydrogen Generation

Cited by 37 publications

References 61 publications

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO2 Photocatalytic Solar-Fuel Production

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO2 Photocatalytic Solar-Fuel Production

Rationally Designed, Efficient, and Earth-Abundant Ni–Fe Cocatalysts for Solar Hydrogen Generation

Oxygen Reduction Reaction in the Field of Water Environment for Application of Nanomaterials

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Product

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CuO_x‐TiO₂ Composites: Electronically Integrated Nanocomposites for Solar Hydrogen Generation

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO₂ Photocatalytic Solar-Fuel Production

Photo-Redeposition Synthesis of Bimetal Pt–Cu Co-catalysts for TiO₂ Photocatalytic Solar-Fuel Production