Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution

Ma, Peijie; Zhang, Xu; Wang, Wenwen; Wang, Zhiwei; Wang, Kaiwen; Feng, Yibo; Wang, Jiaxing; Zhai, Yadi; Deng, Jiguang; Wang, Lihua; Zheng, Kun

doi:10.1016/j.apcatb.2021.120736

Cited by 100 publications

(63 citation statements)

References 55 publications

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“…Figure 4f supports that the activity of CFT is far superior to those of other single‐ or dual‐phase photocatalysts by about tenfolds. [ 32–56 ] Also, we find that high activity in H 2 O 2 conversion (Figure S27, Supporting Information) is well maintained even at the ≈10‐fold higher mass loading of CFT photocatalysts.…”

Section: Resultsmentioning

confidence: 75%

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Triphasic Metal Oxide Photocatalyst for Reaction Site‐Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

Kim

Choi

et al. 2022

Advanced Energy Materials

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The search for photocatalysts allowing the highly active, selective, and stable conversion of molecular oxygen into hydrogen peroxide is of worldwide interest. Here, the authors report the efficient conversion of O2 into H2O2 with ≈100% selectivity and stable cycle stability by a triphasic metal oxide photocatalyst with a cobalt hydroxide carbonate nanosheet phase for water oxidation as well as iron oxide and titanium oxide phases of a core‐shell morphology for charge transfer and oxygen reduction, denoted as CFT. The different surface energies of 0.78 (anatase) and 0.93 J m‐2 (rutile) for titanium oxide and 1.39 J m‐2 for iron oxide result in a core‐shell morphology. The band gaps for iron oxide (2.02 eV), titanium oxide (≈3 eV), and cobalt hydroxide carbonate (3.80 eV) sites reveal that the CFT photocatalyst allows visible‐to‐UV light absorption. The 18O2 isotope‐labeling experiments prove that the core‐shell structure promotes hole transfer toward the water oxidation site. Additionally, the hole‐induced H2O2 decomposition at the oxygen reduction site is efficiently hindered. Moreover, the photogenerated electrons transfer toward the oxygen reduction site to produce H2O2 from O2 with ≈10‐fold higher activity than those by conventional single‐ or dual‐phase photocatalysts, while giving robust cycle stability.

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Section: Resultsmentioning

confidence: 75%

“…e) H 2 O 2 production recyclability test for CFT. f) H 2 O 2 production rates for recent reported photocatalysts [ 32–56 ] and CFT.…”

Section: Resultsmentioning

confidence: 99%

Triphasic Metal Oxide Photocatalyst for Reaction Site‐Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

Kim

Choi

et al. 2022

Advanced Energy Materials

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“…The light absorption intensity of MCS/NCO 40 is also enhanced, which also demonstrates the coupling of NiCo 2 O 4 is favorable to light absorption. The separation efficiency and recombination of photo‐induced charges were measured by photocurrents and PL spectra and shown in Figure 5b, c. Photocurrent intensity represents the separation situation of photogenerated electrons and holes, where the stronger the photocurrent the higher the separation efficiency of photo‐induced charges [29] . The transient photocurrent curves were measured in the dark and light states every 30 se.…”

Section: Resultsmentioning

confidence: 99%

“…Photocurrent intensity represents the separation situation of photogenerated electrons and holes, where the stronger the photocurrent the higher the separation efficiency of photo-induced charges. [29] The transient photocurrent curves were measured in the dark and light states every 30 se. The order of photocurrent intensity on Mn 0.25 Cd 0.75 S and MCS/NCO composites is MCS/NCO 40 > MCS/NCO 60 > MCS/NCO 80 > MCS/NCO 20 > MCS/NCO 100 > Mn 0.25 Cd 0.75 S (Figure 5b), which is in accordance with the result of photocatalytic H 2 evolution performance.…”

Section: Resultsmentioning

confidence: 99%

Manganese Cadmium Sulfide Nanoparticles Solid Solution on Cobalt Acid Nickel Nanoflakes: A Robust Photocatalyst for Hydrogen Evolution

Feng

Gao

et al. 2022

ChemSusChem

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Photocatalytic water splitting for hydrogen evolution is one of the most promising methods to mitigate environmental and energyrelated issues. In this study, manganese cadmium sulfide (Mn x Cd 1x S) solid solution is used to construct a p-n heterostructure with NiCo 2 O 4 through a hydrothermal method. The Mn 0.25 Cd 0.75 S/ NiCo 2 O 4 composites are used for photocatalytic hydrogen evolution reaction, and the optimal hydrogen rate with 40 mg of Mn 0.25 Cd 0.75 S/NiCo 2 O 4 40 mg (MCS/NCO 40) is 61159 μmol g À 1 h À 1 , which is about 16.3 times than that of pure Mn 0.25 Cd 0.75 S. After combining with NiCo 2 O 4 , the light absorption scale, the separation efficiency of photogenerated carriers, and the reaction kinetics are enhanced. Moreover, the band offset of MCS/NCO composites is calculated by the core level alignment method, demonstrating the formation of a p-n heterostructure. The built-in electric field from the p-n heterostructure drives charge transfer and enhances separation efficiency, which results in improved photocatalytic performance.

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“…Among the numerous promising photocatalysts, graphitic carbon nitride (g-C 3 N 4 ) possesses a suitable band structure and stable physicochemical properties, enabling the artificial photosynthesis of H 2 O 2 via the 2e − ORR driven under visible light irradiation [ 14 , 15 ]. However, pristine bulk-g-C 3 N 4 suffers from the low surface area, insufficient harvesting of visible light, and the high recombination rate of photogenerated carriers, it has remained a challenging task to realize efficient photocatalytic activity [ 16 , 17 ].Until now, various strategies have been employed to address the above deficiencies, such as manipulating nanostructures [ 18 , 19 ], introducing defects [ 20 , 21 ], doping metal/metal-free elements [ 22 ], loading single/dual atoms [ 23 , 24 ], nanoclusters [ 25 ], and nanoparticles [ 26 ], as well as constructing heterojunctions [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silver Nanoparticles-Modified Graphitic Carbon Nitride Nanosheets for Highly Efficient Photocatalytic Hydrogen Peroxide Evolution

et al. 2022

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As a promising metal-free photocatalyst, graphitic carbon nitride (g-C3N4) is still limited by insufficient visible light absorption and rapid recombination of photogenerated carriers, resulting in low photocatalytic activity. Here, we adjusted the microstructure of the pristine bulk-g-C3N4 (PCN) and further loaded silver (Ag) nanoparticles. Abundant Ag nanoparticles were grown on the thin-layer g-C3N4 nanosheets (CNNS), and the Ag nanoparticles decorated g-C3N4 nanosheets (Ag@CNNS) were successfully synthesized. The thin-layer nanosheet-like structure was not only beneficial for the loading of Ag nanoparticles but also for the adsorption and activation of reactants via exposing more active sites. Moreover, the surface plasmon resonance (SPR) effect induced by Ag nanoparticles enhanced the absorption of visible light by narrowing the band gap of the substrate. Meanwhile, the composite band structure effectively promoted the separation and transfer of carriers. Benefiting from these merits, the Ag@CNNS reached a superior hydrogen peroxide (H2O2) yield of 120.53 μmol/g/h under visible light irradiation in pure water (about 8.0 times higher than that of PCN), significantly surpassing most previous reports. The design method of manipulating the microstructure of the catalyst combined with the modification of metal nanoparticles provides a new idea for the rational development and application of efficient photocatalysts.

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Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution

Cited by 100 publications

References 55 publications

Triphasic Metal Oxide Photocatalyst for Reaction Site‐Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

Triphasic Metal Oxide Photocatalyst for Reaction Site‐Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

Manganese Cadmium Sulfide Nanoparticles Solid Solution on Cobalt Acid Nickel Nanoflakes: A Robust Photocatalyst for Hydrogen Evolution

Synthesis of Silver Nanoparticles-Modified Graphitic Carbon Nitride Nanosheets for Highly Efficient Photocatalytic Hydrogen Peroxide Evolution

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