Photocatalytic H2 production activity of TiO2 modified by inexpensive Cu(OH)2 cocatalyst

She, Houde; Ma, Xiong; Chen, Kaiyi; Liu, Hui; Huang, Jingwei; Wang, Lei; Wang, Qizhao

doi:10.1016/j.jallcom.2019.153239

Cited by 33 publications

(14 citation statements)

References 52 publications

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“…As shown in the Figure 4a, the calculated band gap energy (Eg) of the sample TMCx (x = 1, 2, 3, 4) and TiO2 are 3.01, 3.04, 3.03, 2.98, 2.98 eV, respectively. [44,45] Photoluminescence (PL) spectra can be employed to determine the recombination rate of photogenerated electron-hole pairs. In general, the stronger the fluorescence, the higher the recombination rate of photogenerated electrons and holes in the sample.…”

Section: Optical Properties and Surface Featuresmentioning

confidence: 99%

Efficient sunlight promoted nitrogen fixation from air under room temperature and ambient pressure via Ti/Mo composites

Chen

Shou²,

Chen³

et al. 2023

Chemical Engineering Journal

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Section: Optical Properties and Surface Featuresmentioning

confidence: 99%

Efficient sunlight promoted nitrogen fixation from air under room temperature and ambient pressure via Ti/Mo composites

Chen

Shou²,

Chen³

et al. 2023

Chemical Engineering Journal

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“…A few metal hydroxides, for example, Co(OH) 2 , Cu(OH) 2 and Ni(OH) 2 , have been applied as co‐catalysts for photocatalytic HER 96‐98 . In a previous study, the sample containing 0.5 mol% Co(OH) 2 showed the highest H 2 production of 20 times greater than that for pristine TiO 2 with excellent photocatalytic H 2 evolution stability.…”

Section: Co‐catalysts On Metal Oxides For Photocatalytic Hydrogen Gen...mentioning

confidence: 99%

Section: Co‐catalysts On Metal Oxides For Photocatalytic Hydrogen Gen...mentioning

confidence: 99%

An overview of co‐catalysts on metal oxides for photocatalytic water splitting

Rosman

Yunus

Shah

et al. 2022

Intl J of Energy Research

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Hydrogen (H 2 ) generation through photoelectrochemical (PEC) water splitting is a promising approach to reducing energy crises and associated environmental problems. Among currently available semiconductors, 2D nanostructured metal oxides have attracted wide interest in PEC applications because of their low-cost synthesis routes, stability in aqueous media, unique configuration and features, and favorable band edge positions. However, metal oxides still suffer from the severe recombination of photogenerated charge carriers and the low consumption of visible light. One solution is to introduce co-catalysts to enhance photocatalytic H 2 generation by improving charge separation and transfer, extending light absorption, and lowering the activation energy. This review summarizes the fundamentals and recent developments of co-catalysts on metal oxides which can be classified into the following categories: metal cocatalysts, metal sulfide co-catalysts, metal hydroxide co-catalysts, metal phosphide co-catalysts, carbon-based co-catalysts, and dual co-catalysts. Charge transfer mechanisms of co-catalysts on metal oxides in photocatalytic H 2 generation and present future trends for co-catalysts and strategies in enhancing PEC water splitting are also presented.

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“…In this context, some noble metal oxides (e.g., IrO 2 , RuO 2 , etc.) have been employed as the cocatalysts to facilitate the charge transfer as well as to function as the active sites for O 2 evolution. − However, the high cost and severe rarity of noble metals restrict them from being extensively applied. , Exploring efficient noble-metal-free cocatalysts is necessary for the development of highly active photocatalysts for O 2 evolution. , …”

Section: Introductionmentioning

confidence: 99%

Effect of the Valence State in Co-Based Cocatalyst on the Photocatalytic Oxygen Evolution Reactivity of WO₃

et al. 2022

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WO3 is one of the most promising photocatalysts with a suitable energy band structure for water oxidation; however, the quick recombination of photoinduced charge carriers seriously limits the photocatalytic efficiency. Loading of suitable cocatalysts is considered as an effective method to significantly improve the photocatalytic activity. Herein, we used a facile one-step hydrothermal method and a “hydrothermal + photodeposition” method to synthesize xCo3O4/WO3 (x = 0.2, 0.4, 0.8) and yCoOOH/WO3 (y = 2, 3, 4), respectively. We found that, in comparison with the pristine WO3, both xCo3O4/WO3 and yCoOOH/WO3 exhibited remarkably increased photocatalytic O2 evolution activities owing to the loading of two Co-based cocatalysts Co3O4 and CoOOH, respectively. Moreover, the optimal O2 evolution rate achieved over 0.4Co3O4/WO3 (194 μmol·h–1) was ∼2.1 times that over 3CoOOH/WO3 (94 μmol·h–1). The superior photocatalytic O2 evolution activity of Co3O4/WO3 over CoOOH/WO3 could be attributed to the mixed valences of Co2+ and Co3+ in Co3O4, which was more favorable than CoOOH with the sole valence of Co3+ for promoting the separation and transfer of photoinduced electrons and holes. This work suggests a promising way to the development of noble-metal-free cocatalyst by using transition-metal oxide with mixed valence states for efficient photocatalytic water oxidation.

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Photocatalytic H2 production activity of TiO2 modified by inexpensive Cu(OH)2 cocatalyst

Cited by 33 publications

References 52 publications

Efficient sunlight promoted nitrogen fixation from air under room temperature and ambient pressure via Ti/Mo composites

Efficient sunlight promoted nitrogen fixation from air under room temperature and ambient pressure via Ti/Mo composites

An overview of co‐catalysts on metal oxides for photocatalytic water splitting

Effect of the Valence State in Co-Based Cocatalyst on the Photocatalytic Oxygen Evolution Reactivity of WO₃

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Photocatalytic H2 production activity of TiO2 modified by inexpensive Cu(OH)2 cocatalyst

Cited by 33 publications

References 52 publications

Efficient sunlight promoted nitrogen fixation from air under room temperature and ambient pressure via Ti/Mo composites

Efficient sunlight promoted nitrogen fixation from air under room temperature and ambient pressure via Ti/Mo composites

An overview of co‐catalysts on metal oxides for photocatalytic water splitting

Effect of the Valence State in Co-Based Cocatalyst on the Photocatalytic Oxygen Evolution Reactivity of WO3

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Product

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Effect of the Valence State in Co-Based Cocatalyst on the Photocatalytic Oxygen Evolution Reactivity of WO₃