Photogenerated-carrier separation along edge dislocation of WO3single-crystal nanoflower photoanode

2018 ◽  
Vol 6 (18) ◽  
pp. 8604-8611 ◽  
Author(s):  
Yuyu Bu ◽  
Jun Ren ◽  
Huawei Zhang ◽  
Dongjiang Yang ◽  
Zhuoyuan Chen ◽  
...  
Keyword(s):  
Edge Dislocation ◽  
Separation Efficiency ◽  
Photogenerated Carrier ◽  
Crystal Face ◽  
Carrier Separation

Edge dislocation on WO3nanosheet can induce a crystal face heterojunction system to promote the separation efficiency of photogenerated carrier.

scholarly journals Anion-exchange-mediated internal electric field for boosting photogenerated carrier separation and utilization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tong Han ◽  
Xing Cao ◽  
Kaian Sun ◽  
Qing Peng ◽  
Chenliang Ye ◽  
...  
Keyword(s):  
Electric Field ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Photogenerated Carrier ◽  
Internal Electric Field ◽  
Design And Optimization ◽  
Halide Anions ◽  
Valence Electrons ◽  
Simple Chemical ◽  
Carrier Separation

AbstractHeterojunctions modulated internal electric field (IEF) usually result in suboptimal efficiencies in carrier separation and utilization because of the narrow IEF distribution and long migration paths of photocarriers. In this work, we report distinctive bismuth oxyhydroxide compound nanorods (denoted as BOH NRs) featuring surface-exposed open channels and a simple chemical composition; by simply modifying the bulk anion layers to overcome the limitations of heterojunctions, the bulk IEF could be readily modulated. Benefiting from the unique crystal structure and the localization of valence electrons, the bulk IEF intensity increases with the atomic number of introduced halide anions. Therefore, A low exchange ratio (~10%) with halide anions (I–, Br–, Cl–) gives rise to a prominent elevation in carrier separation efficiency and better photocatalytic performance for benzylamine coupling oxidation. Here, our work offers new insights into the design and optimization of semiconductor photocatalysts.

scholarly journals Anion-Exchange-Mediated Internal Electric Field: Boosting Photogenerated Carrier Separation and Utilization

2020 ◽  
Author(s):  
Yadong Li ◽  
Tong Han ◽  
Xing Cao ◽  
Kaian Sun ◽  
Qing Peng ◽  
...  
Keyword(s):  
Electric Field ◽  
Separation Efficiency ◽  
Photogenerated Carrier ◽  
Internal Electric Field ◽  
Design And Optimization ◽  
Halide Anions ◽  
Valence Electrons ◽  
Simple Chemical ◽  
Carrier Separation ◽  
First Time

Abstract Constructing heterojunctions is a commonly used method for heterogeneous photocatalysts to modulate the internal electric field (IEF); however, this method suffers from narrow IEF distribution (primarily limited at the heterojunction interface) and long migration paths of photocarriers, and therefore results in suboptimal efficiencies in carrier separation and utilization. In this work, we report for the first time novel basic bismuth nitrate compound nanorods (denoted as BOH NRs) featuring surface-exposed open channels and a simple chemical composition; by simply modifying the bulk anion layers to overcome the limitations of heterojunctions, the bulk IEF could be readily modulated. A low exchange ratio (~10%) with halide anions (I–, Br–, Cl–) would give rise to a prominent elevation in carrier separation efficiency; for the reaction of photocatalytic oxidative coupling of benzylamine, the conversions over the modified catalysts are 1.6–2 times as high as that over pristine BOH. Benefiting from the unique crystal structure and the localization of valence electrons, the IEF intensity increases with the atomic number of introduced halide anions, leading to an enhanced efficiency of carrier separation and utilization. Our work here offers new insights into the design and optimization of semiconductor photocatalysts.

Surface Oxidation Doping to Enhance Photogenerated Carrier Separation Efficiency for Ultrahigh Gain Indium Selenide Photodetector

ACS Photonics ◽  
2017 ◽  
Vol 4 (11) ◽  
pp. 2930-2936 ◽  
Author(s):  
Yih-Ren Chang ◽  
Po-Hsun Ho ◽  
Cheng-Yen Wen ◽  
Tzu-Pei Chen ◽  
Shao-Sian Li ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Surface Oxidation ◽  
Indium Selenide ◽  
Photogenerated Carrier ◽  
Carrier Separation

A solar-to-chemical conversion efficiency up to 0.26% achieved in ambient conditions

2021 ◽  
Vol 118 (46) ◽  
pp. e2115666118
Author(s):  
Yu-Xin Ye ◽  
Jinhui Pan ◽  
Yong Shen ◽  
Minhui Shen ◽  
Huijie Yan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Charge Carrier ◽  
Separation Efficiency ◽  
Biomass Conversion ◽  
Chemical Conversion ◽  
Electron Acceptors ◽  
Ambient Conditions ◽  
Reduction Efficiency ◽  
Earth Abundant ◽  
Carrier Separation

Artificial photosynthesis in ambient conditions is much less efficient than the solar-to-biomass conversion (SBC) processes in nature. Here, we successfully mimic the NADP-mediated photosynthetic processes in green plants by introducing redox moieties as the electron acceptors in the present conjugated polymeric photocatalyst. The current artificial process substantially promotes the charge carrier separation efficiency and the oxygen reduction efficiency, achieving a photosynthesis rate for converting Earth-abundant water and oxygen in air into hydrogen peroxide as high as 909 μmol⋅g−1⋅h−1 and a solar-to-chemical conversion (SCC) efficiency up to 0.26%. The SCC efficiency is more than two times higher than the average SBC efficiency in nature (0.1%) and the highest value under ambient conditions. This study presents a strategy for efficient SCC in the future.

Theoretical Explanation of the Photogenerated Carrier Separation at the Surface Junction

ChemCatChem ◽  
2017 ◽  
Vol 9 (23) ◽  
pp. 4340-4344 ◽  
Author(s):  
Weiyu Song ◽  
Sicong Ma ◽  
Lu Wang ◽  
Jian Liu ◽  
Zhen Zhao
Keyword(s):  
Theoretical Explanation ◽  
Photogenerated Carrier ◽  
Carrier Separation

Enhanced photocatalytic hydrogen production from aqueous-phase methanol reforming over cyano-carboxylic bifunctionally-modified carbon nitride

2019 ◽  
Vol 55 (83) ◽  
pp. 12503-12506 ◽  
Author(s):  
Hao Tan ◽  
Peng Kong ◽  
Meixian Liu ◽  
Xianmo Gu ◽  
Zhanfeng Zheng
Keyword(s):  
Hydrogen Production ◽  
Active Sites ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Promising Candidate ◽  
Methanol Reforming ◽  
Metal Free ◽  
Carrier Separation ◽  
Polymeric Carbon ◽  
Low Activity

Polymeric carbon nitride is a promising candidate for metal-free photocatalysis, but it is hampered by low activity due to poor carrier separation efficiency and lack of active sites.

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