scholarly journals Localized Electron Density Modulation in Conjugated Polymer Nanosheet for Boosting Photocatalytic H2 Evolution

2021 ◽  
Author(s):  
Yaoyao Liu ◽  
Haifeng Yu ◽  
Chong Shi ◽  
Zhonghua Xiang
Keyword(s):  
Electron Density ◽  
Conjugated Polymer ◽  
Reduction Reaction ◽  
H2 Evolution ◽  
Proton Reduction ◽  
Pyridine Nitrogen ◽  
Density Modulation ◽  
Photocatalytic H2 Evolution

A localized electron density modulation strategy is proposed to enhance the intrinsic surface catalytic proton reduction reaction by incorporating symmetric dual pyridine nitrogen (N) atoms into polymer skeleton. Combining with...

scholarly journals Simultaneous Conduction and Valence Band Regulation of Indium-Based Quantum Dots for Efficient H2 Photogeneration

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1115
Author(s):  
Xiu-Ping Li ◽  
Rong-Jin Huang ◽  
Cong Chen ◽  
Tianduo Li ◽  
Yu-Ji Gao
Keyword(s):  
Quantum Dots ◽  
Valence Band ◽  
Metal Ion ◽  
Grand Challenge ◽  
H2 Evolution ◽  
Proton Reduction ◽  
Ion Doping ◽  
Chalcogenide Semiconductors ◽  
Thermodynamic Driving Force ◽  
Photocatalytic H2 Evolution

Indium-based chalcogenide semiconductors have been served as the promising candidates for solar H2 evolution reaction, however, the related studies are still in its infancy and the enhancement of efficiency remains a grand challenge. Here, we report that the photocatalytic H2 evolution activity of quantized indium chalcogenide semiconductors could be dramatically aroused by the co-decoration of transition metal Zn and Cu. Different from the traditional metal ion doping strategies which only focus on narrowing bandgap for robust visible light harvesting, the conduction and valence band are coordinately regulated to realize the bandgap narrowing and the raising of thermodynamic driving force for proton reduction, simultaneously. Therefore, the as-prepared noble metal-free Cu0.4-ZnIn2S4 quantum dots (QDs) exhibits extraordinary activity for photocatalytic H2 evolution. Under optimal conditions, the Cu0.4-ZnIn2S4 QDs could produce H2 with the rate of 144.4 μmol h−1 mg−1, 480-fold and 6-fold higher than that of pristine In2S3 QDs and Cu-doped In2S3 QDs counterparts respectively, which is even comparable with the state-of-the-art cadmium chalcogenides QDs.

Two consecutive postsynthetic modifications of benzothiadiazole-based conjugated polymer for enhanced photocatalytic H2 evolution: the significance of sulfinyl group

2021 ◽  
Author(s):  
Xiaodong Zhao ◽  
Bo Chen ◽  
Wenbo Dong ◽  
Shengyao Wang ◽  
Yonggang Xiang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
H2 Evolution ◽  
Donor Acceptor ◽  
Sulfinyl Group ◽  
Photocatalytic H2 Evolution

Donor/Acceptor (D-A) conjugated polymers recently represent a promising platform for photocatalytic H2 evolution, and a variety of methods have been developed to expand the libray of conjugated polymer based candidates....

scholarly journals Modulating electron density of vacancy site by single Au atom for effective CO2 photoreduction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuehan Cao ◽  
Lan Guo ◽  
Meng Dan ◽  
Dmitry E. Doronkin ◽  
Chunqiu Han ◽  
...  
Keyword(s):  
Electron Density ◽  
Physical Adsorption ◽  
Reduction Reaction ◽  
Photocatalytic Efficiency ◽  
Surface Electron ◽  
Au Nanoclusters ◽  
Product Generation ◽  
Strong Hybridization ◽  
Density Modulation ◽  
Vacancy Site

AbstractThe surface electron density significantly affects the photocatalytic efficiency, especially the photocatalytic CO2 reduction reaction, which involves multi-electron participation in the conversion process. Herein, we propose a conceptually different mechanism for surface electron density modulation based on the model of Au anchored CdS. We firstly manipulate the direction of electron transfer by regulating the vacancy types of CdS. When electrons accumulate on vacancies instead of single Au atoms, the adsorption types of CO2 change from physical adsorption to chemical adsorption. More importantly, the surface electron density is manipulated by controlling the size of Au nanostructures. When Au nanoclusters downsize to single Au atoms, the strong hybridization of Au 5d and S 2p orbits accelerates the photo-electrons transfer onto the surface, resulting in more electrons available for CO2 reduction. As a result, the product generation rate of AuSA/Cd1−xS manifests a remarkable at least 113-fold enhancement compared with pristine Cd1−xS.

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

Langmuir ◽  
2021 ◽  
Vol 37 (11) ◽  
pp. 3321-3330
Author(s):  
Rong Liang ◽  
Yanwen Wang ◽  
Chao Qin ◽  
Xuehua Chen ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Noble Metal ◽  
H2 Evolution ◽  
Metal Free ◽  
Cobalt Phosphide ◽  
P Type ◽  
Photocatalytic H2 Evolution

0D/2D NiS/CdS nanocomposite heterojunction photocatalyst with enhanced photocatalytic H2 evolution activity

2021 ◽  
pp. 149622
Author(s):  
Xiangyu Liu ◽  
Chuanbiao Bie ◽  
Bowen He ◽  
Bicheng Zhu ◽  
Liuyang Zhang ◽  
...  
Keyword(s):  
H2 Evolution ◽  
Photocatalytic H2 Evolution
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