P-Type Cobalt Phosphide Composites (CoP–Co<sub>2</sub>P) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H<sub>2</sub> Evolution Activity

Liang, Rong; Wang, Yanwen; Qin, Chao; Chen, Xuehua; Ye, Zhizhen; Zhu, Liping

doi:10.1021/acs.langmuir.0c03362

Cited by 26 publications

(21 citation statements)

References 48 publications

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“…In conclusion, the poor activity of Ni-MOF and CeO 2 can be attributed to their poor response ability to light. Generally speaking, the higher photocurrent intensity corresponds to the higher separation efficiency of the carrier and lower recombination rate . Most importantly, the photocurrent intensity of Ni-MOF/O, Ni-MOF/S, Ni-MOF/P, and NPCO40 gradually increased.…”

Section: Resultsmentioning

confidence: 95%

2D CeO₂ and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Gong

et al. 2022

Langmuir

143

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Here, an S-scheme heterojunction was constructed on the basis of the modification of a Ni-based metal−organic framework (Ni-MOF) by different in situ treatment strategies. First, NiS 2 , NiO, and Ni 2 P were derived in situ on the surface of Ni-MOF through surface sulfonation, oxidation, and phosphatizing treatments. They can efficiently accept the electrons from the conduction band of Ni-MOF as the trap centers, thus improving the hydrogen production activity. Additionally, phosphatizing makes the electronegativity of Ni-MOF/P stronger than that of the original Ni-MOF, which can enhance the absorption of protons, thus promoting the hydrogen evolution reaction. Next, the S-scheme heterojunction was successfully built by the coupling of 2D CeO 2 with Ni-MOF/P. The maximum hydrogen production rate of the hybrid catalyst (6.337 mmol g −1 h −1 ) is 14.18 times that of the untreated Ni-MOF due to the full utilization of photoinduced electrons. Finally, the probable hydrogen evolution mechanism was proposed by analyzing a series of characterization results and by the density functional theory (DFT) calculation.

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Section: Resultsmentioning

confidence: 95%

2D CeO₂ and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Gong

et al. 2022

Langmuir

143

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“…For example, p-type cobalt phosphide (CoP-Co 2 P)/TiO 2 composite revealed excellent photocatalytic H 2 evolution activity (i.e., 824.5 µmol g −1 h −1 ) under simulated light, which was 160 times higher compared to that of the bare TiO 2 and 1.7 times improved compared to that of the single CoP/TiO 2 . [300] The metal phosphide-based composites also revealed excellent performance for CO 2 conversion. For instance, Zhang et al [301] coupled Tungsten phosphide embedded N-doped carbon with g-C 3 N 4 (WP-NC/g-C 3 N 4 ) and employed in CO 2 photoreduction.…”

Section: Metal Phosphides Based Compositesmentioning

confidence: 96%

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

2021

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concentration for March 2021 was 417.14 parts per million (ppm), which is about 50% higher than the average for pre-industrial levels (i.e., 278 ppm). In order to control global warming, the CO 2 emission must fall by 25% to keep the temperature below 2 °C threshold relative to the pre-industrial climate. [3,4] Among the existing numerous renewable and sustainable energy resources such as wind, solar, hydropower, geo-thermal and ocean-energy, the consumption of unlimited solar energy become a vital alternative energy source, and has been extensively explored during the past few decades. [5] For instant, solar energy could be employed practically in photocatalysis for water splitting to generate hydrogen, carbon dioxide conversion to value added products, and pollutant oxidation. [6][7][8] Photocatalysis has advantage over conventional biological, incineration, electrocatalytic, adsorption, and air stripping treatment techniques because these methods always exhibit shortfalls such as instability, catalyst poisoning, low production yield, poor mechanical strength, time consuming, and electrode corrosion. [9,10] Generally, the photocatalytic process involves several essential steps such as the light absorption by photocatalyst to generate charge carriers, charge carrier's separation and migration to the photocatalyst surface, and the surface redox reactions to transform solar energy into chemical energy. [11,12] If these essential steps are satisfied by a proficient photocatalyst, then of course, high photocatalytic efficiency could be expected. Generally, the fundamental features of a photocatalyst include appropriate band gaps with their corresponding valence and conduction band potentials, surface active sites, surface area, and optical absorption behavior that govern the efficiency and effectiveness of photocatalytic processes. [13,14] Since the photocatalytic reactions are typically performed in water and air environments, therefore, the photocatalyst stability could be crucial under these circumstances. [15] Fujishima and Honda performed water splitting reaction for the first time in 1972, while utilizing TiO 2 photoanode with the aid of Pt as a counter electrode. [16] Afterward, TiO 2 photocatalyst received marvelous attention in photocatalysis owing to its promising features such as its non-toxic nature, water insolubility, nature abundant, hydrophilicity, high stability, and appropriate valence and conduction band potentials for redox reactions. [17] Yet, the Photocatalysis is an advanced technique that transforms solar energy into sustainable fuels and oxidizes pollutants via the aid of semiconductor photo catalysts. The main scientific and technological challenges for effective photocatalysis are the stability, robustness, and efficiency of semiconductor photocatalysts. For practical applications, researchers are trying to develop highly efficient and stable photocatalysts. Since the literature is highly scattered, it is urgent to write a critical review that summarizes the stateof theart progress in the ...

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“…Instead, coverage of a semiconductor blocking light absorption by the other/inner semiconductor has been proposed to explain the decreased photocatalytic efficiency. [ 27–29 ] Such an explanation is not satisfactory, recognizing that Au/Ag–Cu 2 O core–shell particles show a photothermal effect from light absorption by the plasmonic metal cores. [ 30,31 ] Favorable and unfavorable interfacial band bending can be used to describe different charge transfer situations.…”

Section: Introductionmentioning

confidence: 99%

Origin and manifestation of semiconductor facet effects

Huang

Kumar

2022

J Chinese Chemical Soc

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Semiconductor crystals generally exhibit notable facet-dependent electrical conductivity and photocatalytic activity properties. If semiconductor nanocrystals of different shapes are available, their light absorption and emission bands can also display facet dependence, although bulk plus surface absorption combines to give the recorded spectra. All these physical phenomena can be understood, assuming a thin surface layer exists with slight structural deviations as predicted by density functional theory (DFT) calculations to give dissimilar band structures and hence different degrees of band bending and barriers to charge transport across a particular crystal face. This layer thereby tunes light absorption. Recent X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM) analyses begin to suggest the presence of the proposed surface layer.

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P-Type Cobalt Phosphide Composites (CoP–Co₂P) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H₂ Evolution Activity

Cited by 26 publications

References 48 publications

2D CeO₂ and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

2D CeO₂ and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

Origin and manifestation of semiconductor facet effects

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P-Type Cobalt Phosphide Composites (CoP–Co2P) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H2 Evolution Activity

Cited by 26 publications

References 48 publications

2D CeO2 and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

2D CeO2 and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

Origin and manifestation of semiconductor facet effects

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P-Type Cobalt Phosphide Composites (CoP–Co₂P) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H₂ Evolution Activity

2D CeO₂ and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

2D CeO₂ and a Partially Phosphated 2D Ni-Based Metal–Organic Framework Formed an S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution