The effect of directed photogenerated carrier separation on photocatalytic hydrogen production

Si, Yuelei; Cao, Shuang; Wu, Zhijiao; Ji, Yinglu; Mi, Yang; Wu, Xiaochun; Liu, Xinfeng; Piao, Lingyu

doi:10.1016/j.nanoen.2017.10.008

Cited by 57 publications

(36 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, the enhancement in photocatalytic activity of the Au−ZnO heterostructures (for both Asy‐Au−ZnO and Sy‐Au−ZnO) was attributed to the generation of hot electrons from LSPR effect of Au NPs, and the carriers recombination would be prohibited in the Au−ZnO heterostructure. Third, the enhanced piezo‐photocatalysis of the Asy‐Au−ZnO (95%) compared to the Sy‐Au−ZnO (88%) could be attributed to that the asymmetric 1D nanostructure could boost the spatially directed separation of the photon‐generated electron−hole pairs, [ 15 ] and further reduced the recombination rate of charge carriers. According to abovementioned results, the Asy‐Au−ZnO showed obvious advantages due to the strong light absorption capacity and high carriers separation efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…[ 2,14,44 ] More importantly, the unique asymmetric 1D nanostructure could regulate the spatially directed separation and distribution of the electrons and holes along the 1D nanostructure, thus achieving a long‐term separation states of the charge carriers. [ 15,24 ] Finally, the rationally designed asymmetric 1D nanostructure with Schottky junction and piezotronic effect greatly augmented the catalytic efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…To fulfill these goals, high‐efficient photocatalysts should have broad solar light absorption, and effective separation and low recombination rate of photon‐generated electron−hole pairs. [ 2,14,15 ] Oxide semiconductors are widely researched photocatalysts because of their wide availability, high stability, and low cost. However, their wide bandgap and narrow light utilization, low charge carriers mobility, or high photon‐generated charge‐carrier recombination rate have restricted their practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…[ 21,22 ] In the construction of metal/semiconductor Schottky junction, the geometrical configuration has a significant influence on their performance. [ 15,23 ] The hybrid photocatalysts with an asymmetric one dimension (1D) nanostructure, especially vertically oriented nanorod/wire array, have been applied to optimize directed separation efficiency of charge carriers. [ 15,23–29 ] This kind of nanostructure has large surface area, low recombination losses, and high carrier mobility, thus facilitating charge transport and reducing carriers recombination.…”

Section: Introductionmentioning

confidence: 99%

“…[ 15,23 ] The hybrid photocatalysts with an asymmetric one dimension (1D) nanostructure, especially vertically oriented nanorod/wire array, have been applied to optimize directed separation efficiency of charge carriers. [ 15,23–29 ] This kind of nanostructure has large surface area, low recombination losses, and high carrier mobility, thus facilitating charge transport and reducing carriers recombination. Furthermore, the 1D metal/semiconductor junction can extremely engender doughty local plasmonic electric field, [ 23,30 ] which would contribute to photocatalysis via directed separation of charge carriers, and optimize the spatial distribution of the carriers.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Enhanced Piezo‐Photoelectric Catalysis with Oriented Carrier Migration in Asymmetric Au−ZnO Nanorod Array

Xiang

Liu

et al. 2020

Small

154

View full text Add to dashboard Cite

Current photocatalytic semiconductors often have low catalytic performance due to limited light utilization and fast charge carrier recombination. Formation of Schottky junction between semiconductors and plasmonic metals can broaden the light absorption and facilitate the photon‐generated carriers separation. To further amplify the catalytic performance, herein, an asymmetric gold‐zinc oxide (Asy‐Au−ZnO) nanorod array is rationally designed, which realizes the synergy of piezocatalysis and photocatalysis, as well as spatially oriented electron−hole pairs separation, generating a significantly enhanced catalytic performance. In addition to conventional properties from noble metal/semiconductor Schottky junction, the rationally designed heterostructure has several additional advantages: 1) The piezoelectric ZnO under light and mechanical stress can directly generate charge carriers; 2) the Schottky barrier can be reduced by ZnO piezopotential to enhance the injection efficiency of hot electrons from Au nanoparticles to ZnO; 3) the unique asymmetric nanorod array structure can achieve a spatially directed separation and migration of the photon‐generated carriers. When ultrasound and all‐spectrum light irradiation are exerted simultaneously, the Asy‐Au−ZnO reaches the highest catalytic efficiency of 95% in 75 min for dye degradation. It paves a new pathway for designing unique asymmetric nanostructures with the synergy of photocatalysis and piezocatalysis.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Piezo‐Photoelectric Catalysis with Oriented Carrier Migration in Asymmetric Au−ZnO Nanorod Array

Xiang

Liu

et al. 2020

Small

154

View full text Add to dashboard Cite

show abstract

Enhancing the Performance of Bi₂S₃ in Electrocatalytic and Supercapacitor Applications by Controlling Lattice Strain

Zhang

Diao

Ouyang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Lattice‐strained Bi2S3 with 3D hierarchical structures are prepared through a top‐down route by a topotactic transformation. High‐resolution transmission electron microscopy and X‐ray diffraction (XRD) confirm the lattice spacing is expanded by prolonged sulfuration. Performance studies demonstrate that Bi2S3 with the largest lattice expansion (Bi2S3‐9.7%, where 9.7% represents the lattice expansion) exhibits a greater electrocatalytic hydrogen evolution reaction (HER) activity compared to Bi2S3 and Bi2S3‐3.2%. Density functional theory calculations reveal the expansion of the lattice spacing reduces the bandwidth and upshifts the band center of the Bi 3d orbits, facilitating electron exchange with the S 2p orbits. The resultant intrinsic electronic configuration exhibits favorable H* adsorption kinetics and a reduced energy barrier for water dissociation in hydrogen evolution. Operando Raman and post‐mortem characterizations using XRD and X‐ray photoelectron spectroscopy reveal the generation of pseudo‐amorphous Bi at the edge of Bi2S3 nanorods of the sample with lattice strain during HER, yielding Bi2S3‐9.7%‐A. It is worth noting when Bi2S3‐9.7%‐A is assembled as a positive electrode in an asymmetric supercapacitor, its performance is greatly superior to that of the same device formed using pristine Bi2S3‐9.7%. The as‐prepared Bi2S3‐9.7%‐A//activated carbon asymmetric supercapacitor achieves a high specific capacitance of 307.4 F g−1 at 1 A g−1, exhibiting high retention of 84.1% after 10 000 cycles.

show abstract

Efficient Plasmonic Au/CdSe Nanodumbbell for Photoelectrochemical Hydrogen Generation beyond Visible Region

Wang

Gao

Liu

et al. 2019

Advanced Energy Materials

View full text Add to dashboard Cite

in such areas. [2] The ideal efficiency of solar energy conversion of plasmonic metalbased hybrid catalysts comes from anisotropic crystallization, heterointerface. [3] Besides the morphology of plasmonic metal nanocrystals (NCs), the solar energy conversion efficiency of plasmonic metalsemiconductor NCs should be sensitive to the manner of coupling between metal NCs and the semiconductor. [4] Therefore, it is highly desirable to explore a versatile strategy to synthesize accurately controlled anisotropic configuration, monocrystalline shell, and intended site-selective heterocontact between plasmonic metal and semiconductor.The absorbance range is an essential factor on the efficiency of light harvesting and photoelectric catalysis. So far, most of the applications based on plasmonic metal hybrid NCs are limited in specific spectral range, because most of plasmonic metal nanostructures only have plasmon resonances in the visible regions. [5] Au nanorods (NRs), [6] because of its intriguing longitudinal surface plasmon resonance (LSPR), can be excited by incident light polarized along the axial direction. Therefore, it can be synthetically tailored across a broad spectral range and In this communication, light harvesting and photoelectrochemical (PEC) hydrogen generation beyond the visible region are realized by an anisotropic plasmonic metal/semiconductor hybrid photocatalyst with precise control of their topology and heterointerface. Controlling the intended configuration of the photocatalytic semiconductor to anisotropic Au nanorods' plasmonic hot spots, through a water phase cation exchange strategy, the site-selective overgrowth of a CdSe shell evolving from a core/shell to a nanodumbbell is realized successfully. Using this strategy, tip-preferred efficient photoinduced electron/hole separation and plasmon enhancement can be realized. Thus, the PEC hydrogen generation activity of the Au/CdSe nanodumbbell is 45.29 µmol cm −2 h −1 (nearly 4 times than the core/shell structure) beyond vis (λ > 700 nm) illumination and exhibits a high faradic efficiency of 96% and excellent stability with a constant photocurrent for 5 days. Using surface photovoltage microscopy, it is further demonstrated that the efficient plasmonic hot charge spatial separation, which hot electrons can inject into CdSe semiconductors, leads to excellent performance in the Au/CdSe nanodumbbell.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/aenm.201803889.Including the visible light (400-700 nm), the light harvest beyond visible (λ > 700 nm with ≈43% ratio of solar energy) to contribute effective photocatalysis is important but rarely studied. [1] Plasmonic metal based anisotropic metal-semiconductor hybrid nanostructures emerge to be potential materials for applications

show abstract

The effect of directed photogenerated carrier separation on photocatalytic hydrogen production

Cited by 57 publications

References 31 publications

Enhanced Piezo‐Photoelectric Catalysis with Oriented Carrier Migration in Asymmetric Au−ZnO Nanorod Array

Enhanced Piezo‐Photoelectric Catalysis with Oriented Carrier Migration in Asymmetric Au−ZnO Nanorod Array

Enhancing the Performance of Bi₂S₃ in Electrocatalytic and Supercapacitor Applications by Controlling Lattice Strain

Efficient Plasmonic Au/CdSe Nanodumbbell for Photoelectrochemical Hydrogen Generation beyond Visible Region

Contact Info

Product

Resources

About

The effect of directed photogenerated carrier separation on photocatalytic hydrogen production

Cited by 57 publications

References 31 publications

Enhanced Piezo‐Photoelectric Catalysis with Oriented Carrier Migration in Asymmetric Au−ZnO Nanorod Array

Enhanced Piezo‐Photoelectric Catalysis with Oriented Carrier Migration in Asymmetric Au−ZnO Nanorod Array

Enhancing the Performance of Bi2S3 in Electrocatalytic and Supercapacitor Applications by Controlling Lattice Strain

Efficient Plasmonic Au/CdSe Nanodumbbell for Photoelectrochemical Hydrogen Generation beyond Visible Region

Contact Info

Product

Resources

About

Enhancing the Performance of Bi₂S₃ in Electrocatalytic and Supercapacitor Applications by Controlling Lattice Strain