Xue Luan

University of Shanghai for Science and Technology

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Jiangzhi Zi

University of Shanghai for Science and Technology

Zichao Lian

University of Shanghai for Science and Technology

Fangfang Gao

University of Shanghai for Science and Technology

Yueqi Zhong

University of Shanghai for Science and Technology

Hanxiang Wu

Institute of Plant Protection

Duoduo Fang

University of Shanghai for Science and Technology

Han Xiao

Kunming University of Science and Technology

Jiarui Yang

Tsinghua University

Lei Yang

Open University of China

Zhao Li

Xi'an Aeronautical University

Cooperative Institutions

University of Shanghai for Science and Technology

Chinese Academy of Sciences

Shanghai Jiao Tong University

Tsinghua University

Jilin University

University of Chinese Academy of Sciences

Harbin University of Science and Technology

Dalian University of Technology

Guangxi University

Chengdu University

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Modulation of electronic density in ultrathin g-C3N4 for enhanced photocatalytic hydrogen evolution through an efficient hydrogen spillover pathway

Applied Catalysis B Environment and Energy (2023)

Fangfang Gao Han Xiao Jiarui Yang Xue Luan Duoduo Fang

Graphitic carbon nitride

Photocatalytic water splitting

10.1016/j.apcatb.2023.123334

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Citations (46)

Photogenerated Defect‐Transit Dual S‐Scheme Charge Separation for Highly Efficient Hydrogen Production

Advanced Functional Materials (2023)

Xue Luan Ziqi Yu Jiangzhi Zi Fangfang Gao Zichao Lian

Abstract The rational design of a step‐scheme (S‐scheme) heterojunctions in hybrid semiconductors by avoiding unwanted charge transport paths is considered as an attractive way to achieve high photocatalytic activity in hydrogen evolution reaction (HER). Here, a dual S‐scheme heterojunction formed in the lychee‐shaped W 18 O 49 /CdWO 4 /CdS nanostructures is proposed for improving the photocatalytic performance in HER under visible light irradiation. The remarkable activity in photocatalytic HER of W 18 O 49 /CdWO 4 /CdS is attributed to the unique structure and effective charge separation by the photoinduced defect‐transit dual S‐scheme mechanism and strong internal electric field. The measurements of X‐ray photoelectron spectroscopy (XPS), femtosecond transient absorption (fs‐TA) spectroscopy, and electron paramagnetic resonance (EPR) further confirm the photoinduced carrier transfer pathways following the dual S‐scheme mechanism. This research can provide a new strategy for designing the dual S‐scheme heterojunctions to improve photocatalytic performance through the defect band structure engineering.

Charge carrier

10.1002/adfm.202304259

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Ultrathin ZnIn2S4/ZnSe heteronanosheets with modulated S-scheme enable high efficiency of visible-light-responsive photocatalytic hydrogen evolution

Applied Catalysis B Environment and Energy (2023)

Yueqi Zhong Mengyuan Li Xue Luan Fangfang Gao Hanxiang Wu

Charge carrier

10.1016/j.apcatb.2023.122859

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Citations (50)

Modulation of Electronic Density in Ultrathin G-C3n4 for Enhanced Photocatalytic Hydrogen Evolution Through an Efficient Hydrogen Spillover Pathway

Fangfang Gao Han Xiao Jiarui Yang Xue Luan Duoduo Fang

The high recombination of photoinduced electron-hole and deep charge trapping in graphitic carbon nitride (g-C3N4)-based photocatalysts have limited the photocatalytic activity in hydrogen evolution reaction (HER). Here, we proposed the synergistic strategies of electron-deficient boron (B) and electron-rich phosphorus (P) doped g-C3N4 (BPCN) through tuning the electron density for enhanced photocatalytic activity in HER under visible light irradiation. The BPCN exhibited highest photocatalytic activity in HER with the apparent quantum efficiency of 17.4% at 400 nm superior to reported g-C3N4-based photocatalysts. The remarkable activity in HER was attributed to the efficient charge separtion by the shallow charge capture, electron transfer from P to B and the efficient hydrogen spillover pathway occurred by the strong absorption H2O at P sites and then H transferring to B sites. This work paves a new route to changing the electronic density with the tunable band structures through the doping engineering for enhanced photocatalytic activity.

Spillover effect

Modulation (music)

Hydrogen spillover

10.2139/ssrn.4543955

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Ultrathin Znin2s4/Znse Heteronanosheets with Modulated S-Scheme Enable High Efficiency of Visible-Light-Responsive Photocatalytic Hydrogen Evolution

Yueqi Zhong Mengyuan Li Xue Luan Fangfang Gao Hanxiang Wu

The photoinduced carrier transfer mechanism in heterojunction photocatalysts plays a significant role in photocatalytic water splitting. However, the relationships between photocatalytic activity and different band alignments in semiconducting heteronanosheets (HNSs) are rarely reported. Here, we used the ultrathin ZnIn2S4 (ZIS) as a model, and constructed the HNSs such as ZIS/ZnSe, ZIS/ZnS with different band alignments. The time-resolved transient absorption results show that ZIS/ZnSe HNSs exhibited the S-scheme mechanism forming the internal electronic field which has more advantages in HER than the defects state trapping-mediated transfer mechanism in ZIS/ZnS HNSs. The long-lived carrier separation (>3.58 Î¼s) and efficient charge transfer pathways of ZIS/ZnSe HNSs contribute to a highest photocatalytic performance so far, compared with the ZIS-based photocatalysts. These results could pave the route for the design the functional HNCs with different photoinduced carrier dynamics to establish the relationships between composite structures and properties.

Charge carrier

Visible spectrum

10.2139/ssrn.4388101

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Localized Surface Plasmon Resonance Enhanced Metal-Organic Framework-Based Photocatalytic Hydrogen Evolution

SSRN Electronic Journal (2022)

Zhao Li Jiangzhi Zi Xue Luan Minghan Qu Yuzhe Wang

Combining metal nanoparticles (NPs) featured with localized surface plasmon resonance (LSPR) with metal-organic framework (MOF)-based photocatalysts is a novel means for achieving efficient separation of electron-hole pairs. Here, we successfully synthesized the Au@NH2-UiO-66/CdS composites by encapsulating Au NPs with LSPR into the NH2-UiO-66 nanocage, further growing CdS NPs on the surface of the NH2-UiO-66, which exhibited higher photocatalytic activity in hydrogen evolution reaction under visible-light irradiation than that of NH2-UiO-66/CdS and CdS, respectively. Transient absorption measurements reveal that MOF is not only a transit station for electrons generated from CdS to Au, but also a receiver for hot electrons generated from plasmonic Au in Au@MOF/CdS composites. Thus, the LSPR-induced hot electron transfer from Au NPs is an important manifestation to prolong the carrier lifetime and enhance the photocatalytic performance. This work provides insights into investigating the photoinduced carrier dynamics of nanomaterials with LSPR effects for enhancing the MOF-based photocatalytic performance.

10.2139/ssrn.4290457

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Defect-Mediated Electron Transfer in Pt-CuInS₂/CdS Heterostructured Nanocrystals for Enhanced Photocatalytic H₂ Evolution

ACS Applied Nano Materials (2022)

Yueqi Zhong Jiangzhi Zi Fan Wu Zhao Li Xue Luan

The effective separation of photogenerated electrons and holes is the key to improve photocatalytic activity in hydrogen evolution reaction (HER). However, the mechanism of photoinduced charge transfer between the cocatalyst and the semiconducting heterojunction in a single nanocrystal is vague at present. Herein, the relationships between the crafted cocatalyst and the constructed semiconducting heterojunction in a single nanocrystal were verified. Manipulating these relationships will improve the performance of visible light-driven hydrogen evolution. As a model, we used CuInS2 (CIS) nanocrystals (NCs) modified by the cocatalyst platinum (Pt) NCs and the semiconductor cadmium sulfide (CdS), forming the ternary heterostructured NCs (HNCs). Under visible light irradiation, the photocatalytic activity in hydrogen evolution of Pt-CIS/CdS HNCs is 6.38 and 1.76 times higher than those of pristine CIS NCs and CIS/CdS HNCs, respectively. Transient absorption measurements certified that the high photocatalytic activity in the HER was attributed to the photoinduced electron transfer from the defect-mediated trap state in CIS to the cocatalyst Pt, which was superior to the direct Z-scheme heterojunction between CIS and CdS. This research paves a route for the design of a suitable cocatalyst and the formation of heterostructured semiconducting NCs for boosting the photocatalytic activity in solar energy conversion.

Visible spectrum

Cadmium sulfide

10.1021/acsanm.2c00154

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Citations (21)

Localized Surface Plasmon Resonance Promotes Metal–Organic Framework‐Based Photocatalytic Hydrogen Evolution

Advanced Functional Materials (2023)

Zhao Li Jiangzhi Zi Xue Luan Yueqi Zhong Minghan Qu

Abstract Combining metal nanoparticles (NPs) featured with localized surface plasmon resonance (LSPR) with metal–organic framework (MOF)‐based photocatalysts is a novel means for achieving efficient separation of electron–hole pairs. Herein, the Au@NH 2 ‐UiO‐66/CdS composites are successfully synthesized by encapsulating Au NPs with LSPR into the NH 2 ‐UiO‐66 nanocage, further growing CdS NPs on the surface of the NH 2 ‐UiO‐66, which exhibits higher photocatalytic activity in hydrogen evolution reaction under visible‐light irradiation than that of NH 2 ‐UiO‐66/CdS and CdS, respectively. Transient absorption measurements reveal that MOF is not only a transit station for electrons generated from CdS to Au, but also a receiver for hot electrons generated from plasmonic Au in Au@MOF/CdS composites. Thus, the LSPR‐induced hot electron transfer from Au NPs is an important manifestation to prolong the carrier lifetime and enhance the photocatalytic performance. This work provides insights into investigating the photoinduced carrier dynamics of nanomaterials with LSPR effects for enhancing the MOF‐based photocatalytic performance.

Nanomaterials

Nanocages

Visible spectrum

10.1002/adfm.202303069

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Citations (72)

Gemstone nanoflower-shaped ZnIn2S4/CuS heterojunction with ultralong lifetime of photoinduced carriers for photocatalytic hydrogen evolution

Applied Catalysis B Environment and Energy (2024)

Ziqi Yu Xue Luan Han Xiao Yupeng Yang Di Luo

Nanoflower

10.1016/j.apcatb.2024.123702

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Citations (28)