Optical resonance and charge transfer behavior of patterned WO3 microdisc arrays

2016 ◽  
Vol 9 (10) ◽  
pp. 3143-3150 ◽  
Author(s):  
Hye Won Jeong ◽  
Weon-Sik Chae ◽  
Bokyung Song ◽  
Chang-Hee Cho ◽  
Seong-Ho Baek ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Optical Resonance ◽  
Transfer Behavior

Patterned WO3 microdisc arrays exhibit excellent photoelectrochemical performances, owing to enhanced light absorption and effective charge separation.

scholarly journals Photocatalytic CO2 reduction of C/ZnO nanofibers enhanced by an Ni-NiS cocatalyst

Nanoscale ◽  
2020 ◽  
Vol 12 (13) ◽  
pp. 7206-7213 ◽  
Author(s):  
Hongzhao Deng ◽  
Feiyan Xu ◽  
Bei Cheng ◽  
Jiaguo Yu ◽  
Wingkei Ho
Keyword(s):  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Co2 Reduction ◽  
Reduction Activity ◽  
Zno Nanofibers

Photocatalyst Ni-NiS/C/ZnO shows improved photocatalytic CO2-reduction activity due to enhanced light absorption, good CO2 adsorption and effective charge separation.

scholarly journals Synergistic effect of Ni–Ag–rutile TiO2 ternary nanocomposite for efficient visible-light-driven photocatalytic activity

RSC Advances ◽  
2020 ◽  
Vol 10 (60) ◽  
pp. 36930-36940 ◽  
Author(s):  
Petri M. Leukkunen ◽  
Ekta Rani ◽  
Assa Aravindh Sasikala Devi ◽  
Harishchandra Singh ◽  
Graham King ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Visible Light ◽  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Energy Dispersive ◽  
Intimate Contact ◽  
Visible Light Absorption ◽  
Visible Light Driven

Robust photocatalytic activity of Ni–Ag–RTiO2 is attributed to the improved visible light absorption and effective charge separation due to intimate contact between Ni and RTiO2via Ag, as evidenced by Ti3+ in Ti 2p XPS and energy dispersive mapping.

An effective strategy of constructing a multi-junction structure by integrating a heterojunction and a homojunction to promote the charge separation and transfer efficiency of WO3

2020 ◽  
Vol 8 (13) ◽  
pp. 6256-6267 ◽  
Author(s):  
Yanting Li ◽  
Zhifeng Liu ◽  
Junwei Li ◽  
Mengnan Ruan ◽  
Zhengang Guo
Keyword(s):  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Transfer Efficiency ◽  
Effective Strategy ◽  
Junction Structure

Constructing a multi-junction structure by integrating homojunction and heterojunction is an effective strategy for adequate light absorption, effective charge separation and transfer of WO3 photoanodes.

scholarly journals Carbon Dioxide Photoreduction on the Bi2S3/MoS2 Catalyst

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 998 ◽  
Author(s):  
Kim ◽  
Kim ◽  
Do ◽  
Seo ◽  
Kang
Keyword(s):  
Carbon Dioxide ◽  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Active Sites ◽  
Electron Excitation ◽  
Photocurrent Density ◽  
Catalytic Performance ◽  
Inorganic Materials ◽  
Composite Catalyst

The photocatalytic activity of a material is contingent on efficient light absorption, fast electron excitation, and control of the recombination rate by effective charge separation. Inorganic materials manufactured in unique shapes via controlled synthesis can exhibit significantly improved properties. Here, n-type Bi2S3 nanorods (with good optical activity) were wrapped with two-dimensional (2D) p-type MoS2 sheets, which have good light absorption properties. The designed p-n junction Bi2S3/MoS2 composite exhibited enhanced light absorption over the entire wavelength range, and higher carbon dioxide adsorption capacity and photocurrent density compared to the single catalysts. Consequently, the activity of the 1Bi2S3/1MoS2 composite catalyst for the photocatalytic reduction of carbon dioxide was more than 20 times higher than that of the single catalysts under visible-light irradiation at ≤400 nm, with partial selectivity for CO conversion. This is attributed to the p-n heterojunction Bi2S3/MoS2 composite designed in this study, the high light absorption of n-Bi2S3, accelerated electron excitation, and the electron affinity of the 2D sheet-p-MoS2, which quickly absorbed excited electrons, resulting in effective charge separation. This ultimately improved the catalytic performance by continuously supplying catalytically active sites to the heterojunction interfaces.

Efficient spatial charge separation in unique 2D tandem heterojunction CdxZn1−xIn2S4–CdS–MoS2 rendering highly-promoted visible-light-induced H2 generation

2021 ◽  
Vol 9 (1) ◽  
pp. 482-491
Author(s):  
Jiakun Wu ◽  
Bowen Sun ◽  
Hui Wang ◽  
Yanyan Li ◽  
Ying Zuo ◽  
...  
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Effective Charge ◽  
Active Sites ◽  
H2 Generation ◽  
Highly Efficient ◽  
Spatial Charge

Unique 2D heterostructures CdxZn1−xIn2S4–CdS–MoS2 with effective charge separation, excellent light-harvest, and abundant active sites are highly-efficient for photocatalytic H2 evolution.

scholarly journals Anion-enhanced excited state charge separation in a spiro-locked N-heterocycle-fused push-pull zinc porphyrin

2021 ◽  
Author(s):  
Mandeep K. Chahal ◽  
Anuradha Liyanage ◽  
Ajyal Z. Alsaleh ◽  
Paul A. Karr ◽  
Jonathan P. Hill ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Charge Separation ◽  
Charge Transfer Complex ◽  
Zinc Porphyrin ◽  
New Type ◽  
State Charge

A new type of push–pull charge transfer complex, viz., a spiro-locked N-heterocycle-fused zinc porphyrin, ZnP-SQ, is shown to undergo excited state charge separation, which is enhanced by axial F− binding to the Zn center.

scholarly journals Studies on the substrate-dependent photocatalytic properties of Cu2O heterojunctions

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 4935-4941
Author(s):  
Riza Ariyani Nur Khasanah ◽  
Hui-Ching Lin ◽  
Hsiang-Yun Ho ◽  
Yen-Ping Peng ◽  
Tsong-Shin Lim ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Charge Separation ◽  
Spectral Response ◽  
Photocatalytic Properties ◽  
Visible Light Absorption ◽  
Uv Visible

Cu2O/TNA/Ti photoanode showed spectral response outperformed Cu2O/Ti and Cu2O/FTO photocathodes. Cu2O/TNA/Ti showed better spectral response than that of TNA/Ti, ascribed to UV-visible light absorption of Cu2O, not to charge separation enhancement.

scholarly journals Long-lived charge separation following pump-wavelength–dependent ultrafast charge transfer in graphene/WS2 heterostructures

2021 ◽  
Vol 7 (9) ◽  
pp. eabd9061
Author(s):  
Shuai Fu ◽  
Indy du Fossé ◽  
Xiaoyu Jia ◽  
Jingyin Xu ◽  
Xiaoqing Yu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Separation ◽  
Transient Absorption ◽  
Transition Metal Dichalcogenides ◽  
Thermionic Emission ◽  
Great Promise ◽  
Metal Dichalcogenides ◽  
Ultrafast Charge Transfer ◽  
Device Operation ◽  
Interfacial Charge

Van der Waals heterostructures consisting of graphene and transition metal dichalcogenides have shown great promise for optoelectronic applications. However, an in-depth understanding of the critical processes for device operation, namely, interfacial charge transfer (CT) and recombination, has so far remained elusive. Here, we investigate these processes in graphene-WS2 heterostructures by complementarily probing the ultrafast terahertz photoconductivity in graphene and the transient absorption dynamics in WS2 following photoexcitation. We observe that separated charges in the heterostructure following CT live extremely long: beyond 1 ns, in contrast to ~1 ps charge separation reported in previous studies. This leads to efficient photogating of graphene. Furthermore, for the CT process across graphene-WS2 interfaces, we find that it occurs via photo-thermionic emission for sub-A-exciton excitations and direct hole transfer from WS2 to the valence band of graphene for above-A-exciton excitations. These findings provide insights to further optimize the performance of optoelectronic devices, in particular photodetection.

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