p–n tungsten oxide homojunctions for Vis-NIR light-enhanced electrocatalytic hydrogen evolution

2019 ◽  
Vol 7 (33) ◽  
pp. 19573-19580 ◽  
Author(s):  
Bin Chang ◽  
Zizheng Ai ◽  
Dong Shi ◽  
Yueyao Zhong ◽  
Kang Zhang ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Hydrogen Evolution ◽  
Oxygen Vacancies ◽  
Light Irradiation ◽  
Phosphorus Doping ◽  
Nir Light

A novel p–n tungsten oxide homojunction was built by synchronous tuning of oxygen vacancies and phosphorus-doping. Under Vis-NIR light irradiation, this electrocatalytic system exhibited glorious alkaline hydrogen evolution activity.

Modulation of oxygen vacancy in tungsten oxide nanosheets for Vis-NIR light-enhanced electrocatalytic hydrogen production and anticancer photothermal therapy

Nanoscale ◽  
2019 ◽  
Vol 11 (39) ◽  
pp. 18183-18190 ◽  
Author(s):  
Haiyan Liang ◽  
Hongjuan Xi ◽  
Shaoqiong Liu ◽  
Xuemei Zhang ◽  
Haiqing Liu
Keyword(s):  
Hydrogen Production ◽  
Oxygen Vacancy ◽  
Tungsten Oxide ◽  
Hydrogen Evolution ◽  
Noble Metal ◽  
Photothermal Therapy ◽  
Light Irradiation ◽  
Nir Light

Noble-metal like photoelectrocatalytic hydrogen evolution and efficient anticancer photothermal therapy were accomplished by simply tuning the oxygen vacancy of WO3 nanosheets under Vis-NIR light irradiation.

scholarly journals Carbon Quantum Dots (CQDs) Decorated Bi2O3-x Hybrid Photocatalysts with Promising NIR-Light-Driven Photodegradation Activity for AO7

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1031 ◽  
Author(s):  
Tao Xian ◽  
Xiaofeng Sun ◽  
Lijing Di ◽  
Yongjie Zhou ◽  
Jun Ma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Oxygen Vacancies ◽  
Carbon Quantum Dots ◽  
Light Irradiation ◽  
Light Illumination ◽  
Surface Oxygen ◽  
Simulated Sunlight ◽  
Nir Light

In this work, Bi2O3-x with surface oxygen vacancies was prepared through the NaBH4 reduction of Bi2O3. After that, carbon quantum dots (CQDs) were deposited onto the surface of the Bi2O3-x to obtain a series of the CQDs/Bi2O3-x composites. The HRTEM and XPS characterizations of the CQDs/Bi2O3-x composites suggest that the thickness of surface oxygen vacancies could be adjusted by changing the concentration of NaBH4 solution, and the intimate contact between CQDs and the Bi2O3-x is achieved. Acid orange 7 (AO7) was adopted as the target reactant for investigating the photocatalytic degradation activities of the CQDs/Bi2O3-x composites under simulated sunlight and NIR light irradiation. It is found that the photocatalytic activities of the samples are closely related to the concentration of NaBH4 and content of CQDs. The Bi2O3-x samples exhibit enhanced simulated-sunlight-driven photocatalytic activity compared with Bi2O3. Specifically, the optimal degradation efficiency of AO7 is achieved over the 3R-Bi2O3-x (concentration of NaBH4: 3 mmol/L), which is 1.38 times higher than the degradation AO7 efficiency over Bi2O3. After the decoration of the 3R-Bi2O3-x surface with CQDs, the simulated-sunlight-driven photocatalytic activity of the CQDs/Bi2O3-x composite could be further enhanced. Among the samples, the 15C/3R-Bi2O3-x sample reveals the highest photocatalytic activity, leading to an AO7 degradation percentage of ~97% after 60 min irradiation. Different from Bi2O3 and the 3R-Bi2O3-x, the 15C/3R-Bi2O3-x sample also exhibits near-infrared (NIR)-light-driven photocatalytic degradation activity. In addition, the intrinsic photocatalytic activity of CQDs/Bi2O3-x composite was further confirmed by the degradation of phenol under simulated sunlight and NIR light irradiation. The photocurrent response and electrochemical impedance spectroscopy (EIS) measurements confirm the efficient migration and separation of photogenerated charges in the CQDs/Bi2O3-x samples. The •OH and h+ are proved to be the main reactive species in the simulated sunlight and NIR light photocatalytic processes over the CQDs/Bi2O3-x composites. According to the above experiments, the photocatalytic degradation mechanisms of the CQDs/Bi2O3-x composites under simulated sunlight and NIR light illumination were proposed.

Molybdenum‐tungsten Oxide Nanowires Rich in Oxygen Vacancies as An Advanced Electrocatalyst for Hydrogen Evolution

2020 ◽  
Vol 15 (19) ◽  
pp. 2984-2991
Author(s):  
Xinxin Tang ◽  
Jianglin Liu ◽  
Ke Zhan ◽  
Hao Sun ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Hydrogen Evolution ◽  
Oxygen Vacancies ◽  
Oxide Nanowires

Semiconductor Photocatalysts for Solar-to-Hydrogen Energy Conversion: Recent Advances of CdS

2020 ◽  
Vol 16 ◽  
Author(s):  
Yuxue Wei ◽  
Honglin Qin ◽  
Jinxin Deng ◽  
Xiaomeng Cheng ◽  
Mengdie Cai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Noble Metals ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Theoretical Design ◽  
Recent Developments

Introduction: Solar-driven photocatalytic hydrogen production from water splitting is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. In this review, recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. In particular, the factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Background: Photocatalytic hydrogen evolution from water splitting using photocatalyst semiconductors is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. Methods: This review summarizes the recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation. Results: Recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. The factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Conclusion: The state-of-the-art CdS for producing hydrogen from photocatalytic water splitting under visible light is discussed. The future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are also described.

CdS/Ag2S/g-C3N4 ternary composites with superior photocatalytic performance for hydrogen evolution under visible light irradiation

2021 ◽  
Vol 50 (9) ◽  
pp. 3253-3260 ◽  
Author(s):  
Shan Zhao ◽  
Junbiao Wu ◽  
Yan Xu ◽  
Xia Zhang ◽  
Yide Han ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Light Irradiation ◽  
Synergic Effect

CdS/Ag2S/g-C3N4 ternary composites showed excellent photocatalytic performance toward H2 evolution. Their improved photocatalytic activity could be attributed not only to the synergic effect, but also to the introduction of Ag2S.

D–π–A-type triphenylamine dye covalent-functionalized g-C3N4 for highly efficient photocatalytic hydrogen evolution

2020 ◽  
Vol 10 (6) ◽  
pp. 1609-1618 ◽  
Author(s):  
Chao Zhang ◽  
Jiandong Liu ◽  
Xingliang Liu ◽  
Shiai Xu
Keyword(s):  
Reaction Mechanism ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Highly Efficient

Reaction mechanism for the higher photocatalytic performance of H2 production of g-C3N4NSs/TC1 under visible light irradiation (λ ≥ 400 nm).

A mitochondria-targeting photothermogenic nanozyme for MRI-guided mild photothermal therapy

2018 ◽  
Vol 54 (100) ◽  
pp. 14108-14111 ◽  
Author(s):  
Kangqiang Qiu ◽  
Jinquan Wang ◽  
Thomas W. Rees ◽  
Liangnian Ji ◽  
Qianling Zhang ◽  
...  
Keyword(s):  
Photothermal Therapy ◽  
Light Irradiation ◽  
Nir Light ◽  
Mri Guided ◽  
Mitochondria Targeting

A mitochondria-targeting photothermogenic nanozyme was used to increase localized temperature and accelerate the catalysis of H2O2 to ˙OH under NIR light irradiation for mild photothermal therapy.

Sign in / Sign up

Export Citation Format

Share Document