Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 10
·2300061
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IF 5.8
Yuewen Li,Degang Bu,Jiangxin Wang,Xing Hou,Chunkun Lin,Xu Ma,Shuo Li,Yu Zhang,Tianyi Ma
The recovery of noble metals is crucial in terms of resource utilization and ecological environment. Herein, a green strategy for the recovery of three noble metals, Au, Ag, and Pt, by photoelectric deposition at the cathode without external voltage is described. The realizability and mechanism of noble metals deposition are investigated and analyzed in terms of the band structure and the reduction potential of metal ions using the special heterostructure ZnO/ZnS composites derived from metal–organic frameworks, as well as ZnO and Fe 2 O 3 semiconductors. It is found that ZnO/ZnS has preferable photoelectrochemical performance than pure ZnO due to their effective electron–hole separation and appropriate band matching structure. To deposit metals Au, Ag, and Pt, the potential of electrons in the conduction band of ZnO/ZnS should be more negative than the reduction potential of these metals, allowing for the deposition of these metals while simultaneously undergoing an oxygen evolution reaction, mediated by the photogenerated holes on the surface of the photoanode, and the collection of conduction band electrons by the back electrode.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Chem
·
2023
·
IF 23.5
Qiushi Ruan,Xufeng Xi,Bingzhen Yan,Lingqiao Kong,Chaoran Jiang,Junwang Tang,ZhengMing Sun
Considering the intermittent solar energy availability, storing excess photon energy for subsequent use in dark represents a decoupled solar energy utilization strategy, resembling the dark reduction process in natural photosynthesis. Multi-electron accumulation is key to such dark photosynthesis. However, accompanied by energy loss of stored photoelectrons, dark hydrogen generation suffers from low efficiency. Here, we demonstrate the efficient release of hydrogen from methanol reforming in the dark over a TiO x /CN faradaic junction. Under irradiation, photoelectrons generated from polymeric carbon nitride (CN) were stored in an electron pool at the TiO x /CN interface with negligible energy loss via a quasi-isoenergetic process. Those stored photoelectrons slowly release active electrons for proton reduction, resulting in decoupled hydrogen generation in the dark. This storing process describes accumulation and gradual release of photoelectrons in a faradaic junction, which enables the on-demand utilization of solar energy for hydrogen generation, thereby alleviating the mismatch between solar hydrogen demand and sunlight availability.
研究领域:
材料科学
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能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuying Yang,Mengmeng Sun,Zhuoyuan Chen,Hengyue Xu,Xiaohui Wang,Jizhou Duan,Baorong Hou
Solar energy-driven photoinduced cathodic protection (PICP) technology utilizes solar energy to protect marine metallic structures against severe marine corrosion. To enhance the solar energy utilization and strengthen dark-state application for realizing long-term protection, herein, a 3D nanothorn cluster-like WO 3 /ZnO/Zn-Bi 2 S 3 multijunction with electron-storage characteristic and adjustable energy band was constructed. It exhibited an enhanced continuous release of photogenerated electron and sustained cathodic protection in dark conditions. Exposed to only 100 s of simulated sunlight irradiation, the WO 3 /ZnO/Zn-Bi 2 S 3 could store 5.27×10 −2 C electrons and provide up to 5460 s of sustained CP for the coupled metal after light stops, which was 10.8 and 3.5 times higher than those of WO 3 /ZnO (4.89×10 −3 C) and WO 3 /Zn-Bi 2 S 3 (1.51×10 −2 C), respectively. The WO 3 nanothorn cluster-like substrate with reversible valence transformation of W 6+ /W 5+ together with the large surface area and one-dimensional transmission path can store photogenerated electrons under illumination and release photogenerated electrons after light stops efficiently. Notably, the tri-phase heterojunction with introduction of intermediate “Carrier Springboard” ZnO between WO 3 and Zn-Bi 2 S 3 contributed to the building of well-matched energy band gradient to strengthen the directional backward transfer of photogenerated electrons and holes. The energy band of Bi 2 S 3 sensitizer was adjusted towards negative direction by doping with zinc element to boost PICP application performance. The reversible valence transformation of Bi 3+ /Bi 5+ could promote the consumption of photogenerated holes. These synergistically enhanced the sustained PICP performance of the WO 3 /ZnO/Zn-Bi 2 S 3 photoelectrode both in dark and light conditions. This design shed light on energy-storage photoelectrodes for long-term PICP of metallic materials.
研究领域:
材料科学
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腐蚀与防护
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太阳能技术
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Cheng Guo,Xuehai Ren,Changyan Guo,Naeem Akram,Muhammad Saad Mansha,Ali Ahmad,Saman Khawaja,Jide Wang
In this study, the CdS/Ni-MOF74 (CNM) photocatalyst was synthesized via the combination of CdS with the advantageous properties of MOFs. The composites exhibit a wide visible absorption and photo electron-hole separation efficiency, thus giving improved bifunctional properties for H 2 evolution in conjunction with the benzyl alcohol’s oxidation. The results indicate that as synthesized CNM3 catalyst shows excellent efficiency of hydrogen evolution having an evolution rate of 5783 µmol g −1 h −1 , and the amount of benzaldehyde generated after benzyl alcohol’s oxidation reached 8059.8 µmol g −1 . After four cycles, the H 2 evolution efficiency remained at 5351 µmol g −1 h −1 . According to experiments using radical trapping and mechanistic investigations, it was revealed that the photogenerated holes (h + ) were the key species mainly responsible for benzaldehyde production as well as H 2 evolution. This research work could lead to new approaches resulting in simultaneous organic oxidation processes and hydrogen evolution by using MOF-derived hybrid photocatalysts.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 5
·055018
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IF 2.07
Mingxing Xiao,Rajesh Pathak,Dongping Zheng,Yuanyuan Jiang,Yingjie Zhang,Kaiwen Wei,Fan Wu
In this paper, two different nanostructures of CuO seeds layer and CuO nanocones array as photocathode were introduced for TiO2/Sb2S3 heterojunction to study the photoelectrochemical properties. The all-solid FTO/TiO2/Sb2S3/CuO seeds layer/FTO device and FTO/TiO2/Sb2S3/CuO nanocones array/FTO device could realize photoelectric conversion with a small photocurrent and photovoltage, and the photoelectrochemical properties of FTO/TiO2/Sb2S3/CuO nanocones array/FTO is even lower than that of the FTO/TiO2/Sb2S3/CuO seeds layer/FTO device due to the limited contact area between Sb2S3 and CuO nanocones. When the electrolyte I3−/I− was filled into space between Sb2S3 and CuO seeds (nanocones array) photocathode, the photoelectrochemical performance was significantly improved, especially, the photocurrent is enhanced by two (four) orders of magnitude and the photovoltage is enhanced by two orders of magnitude than the device for both photocathodes without electrolyte. For better understanding the photoelectrochemical mechanism of different CuO nanostructure photocathodes, dynamic characterization of intensity-modulated photocurrent/photovoltage spectroscopy and photoelectrochemical impedance spectroscopy were carried out to study photo-generated electron and hole behaviors. Results showed that charge transfer rate in device with CuO seeds layer photocathode is significantly enhanced by CuO nanocones array photocathode. The better hole transfer also improved the charge separation in Sb2S3 and reduced their recombination rate, which results in the enhanced photocurrent and photovoltage by CuO nanocones array photocathode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Ting Li,Yuhao Tian,Jessica Nginyo,Daniela Iracelma Difuma Luis,Weijie Cai
Light-assisted thermocatalytic dry reforming of ethanol (EDR) utilizing the synergistic effect of photocatalysis and thermocatalysis is regarded as a promising route to convert greenhouse gas CO 2 into value-added chemicals. In this work, double-shell NiZnO x hollow microspheres (NiZnO x -M) were synthesized as light-harvesting catalyst to enhance EDR performance under mild conditions. The characterization results of UV–vis–NIR and Photoluminescence Spectroscopy (PL) indicated that the band gap energy of NiZnO x -M catalyst was narrower because of the smaller Ni nanoparticles , thereby broadening its optical response range especially in visible light. The strong absorbance of light could greatly improve the activation of ethanol/CO 2 and the gasification of carbon. With light irradiation, light could induce the transfer of photogenerated electron from semiconductor ZnO to active metal Ni, reducing the reaction energy barrier. Hence, NiZnO x -M catalyst showed superior photothermal catalytic activity along with good resistance capacity to coke accumulation and aggregation of active metal. Ethanol conversion was ca.2 times those obtained over NiZnO x -C prepared by conventional precipitation method. No obvious deactivation occurred after 100 h tests. This work provides some guidance for the design of high-performance photothermal catalyst to achieve the photo-thermal-chemical conversion of the greenhouse gases.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Rui Sun,Hongtao Li,Yudan Zhang,Junyi Hua,Wenxin Xu,Kexin Li,Huiqin Guo,Liushui Yan,Shenglian Luo
In this paper, BiOBr@H 3 PW 12 O 40 @BiOI heterostructure with honeycomb-like morphology is successfully constructed for the first time by a simple one-step solvothermal strategy. The introduction of H 3 PW 12 O 40 effectively improves the specific surface area and photon trapping ability of BiOBr@BiOI heterostructure. More importantly, the W 5d electron orbital of H 3 PW 12 O 40 , as an electron bridge, effectively improves the transmission efficiency of photogenerated electrons in the BiOBr@BiOI heterostructure, thus making the BiOBr@H 3 PW 12 O 40 @BiOI heterostructure show excellent performance in the photocatalytic oxidation or reduction reaction. Based on the macro-thermodynamic model proposed in our previous work and the active species capture experiments, the photocatalytic oxidation or reduction mechanism by using as-prepared BiOBr@H 3 PW 12 O 40 @BiOI heterostructure is discussed in detail.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Li Zhen,Guo Guizhang,Yu Zhou,Ma Zengyue,Yu Libo
In the pursuit of highly efficient hydrogen production through photoelectrochemical water splitting, expanding the utilization of the visible spectrum and extending the lifetime of photogenerated electrons are crucial challenges for improving the efficiency. To address these challenges, we prepared CdS sensitized TiO 2 photoanodes using a one-step hydrothermal method, employing thioglycolic acid (TGA) and mercaptopropionic acid (MPA) as linkers. The successful synthesis of CdS QDs and the CdS/TiO 2 photoanode was confirmed through various characterization techniques, including transmission electron microscopy (TEM), X-ray diffraction, and scanning electron microscopy. Performance evaluations revealed that the TGA-decorated CdS/TiO 2 photoanode exhibited superior photocurrent density and stability compared to the MPA-modified counterpart. Notably, its applied bias photo-to-current conversion efficiency was 1.7 times greater than that of the MPA-modified CdS/TiO 2 photoanode. Furthermore, UV–visible absorption spectrum analysis demonstrated that the incorporation of CdS QDs significantly broadened the spectral response of the TiO 2 photoanode, extending it from the ultraviolet to the visible range. This enhancement is crucial for improving light harvesting capabilities. Additionally, our analysis of electron lifetime indicated that the shorter molecular chains of TGA effectively minimize the transfer distance for photogenerated electrons from the CdS QDs to the TiO 2 , resulting in improved electron lifetimes and, consequently, enhanced photocurrent density.
研究领域:
材料科学
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能源科学
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Weiwei Lu,Fengyang Ju,Kaisheng Yao,Xuefeng Wei
Conversion of CO2 into value-added fuels and chemicals faces the challenges of high overpotential, low selectivity for desired products, and sluggish multi-electron transfer kinetics. Plasmon-mediated electrocatalytic methods show potential for overcoming these problems. In this work, choosing Au nanoparticles (NPs) as the dual-functional material of the electrocatalyst and plasmonic support, methanol can be efficiently produced from CO2 reduction. The dependences of current density and Faradaic efficiency (FE) on the Au NP size, light wavelength, and light density are systematically investigated. The performance test results show that CH3OH with FE as high as 52% can be obtained at a potential of −0.8 V (vs RHE) when a 20.2 nm Au NP-modified glass carbon electrode is under excitation using 520 nm light with a light density of 120 mW/cm2. The performance results, along with the discrete dipole approximation calculation and electrochemical characterizations, suggest that the efficient activation of CO2 by plasmon-generated energetic electrons accounts for the enhanced conversion rate and the high selectivity for CH3OH production.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Dan Wang,Hanlin Wang,Juanjuan Fan,Hancheng Zhu,Akira Fujishima,Xintong Zhang
Photoelectrochemical (PEC) performance of photoanode is limited by the cascade-dynamic processes, mainly including light absorption , charge separation, and surface reaction. This work adopted a strategy of nanocones modification on FTO substrate (FTO-NC) to enhance light utilization and photoelectrons collection for improved PEC water splitting . Comparative studies showed that FTO-NC enhanced the light scattering, promoting the conversion process of photon to electron/hole and enlarging the effective surface area of BiVO 4 for surface reaction. Meanwhile, cooperative Mo-doping and Co-MOF decoration improved the bulk electron transportation in BiVO 4 , hole migration towards the electrode surface , and accelerated the water oxidation reaction of photogenerated holes. The photocurrent density of FTO-NC/BiVO 4 -Mo/MOFs reached 3.56 mA cm −2 , 6.14 times that of pristine BiVO 4 . The IPCE of FTO-NC/BiVO 4 -Mo/MOFs photoanode achieve 60% at 1.23 V vs. RHE, demonstrating a significantly enhanced light utilization performance. This work presents new insight into boosting cascade-dynamic processes through collaborative strategies for highly efficient PEC water-splitting.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaoyan Wang,Yu Yuan,Jingru Lai,Xiaoli Shi,Mingye Ding
Solar-driven water splitting for hydrogen production is a pivotal technique for sustainable energy conversion. However, its efficiency is constrained by intermittent solar irradiation and rapid charge recombination. To overcome these limitations, designing a round-the-clock photocatalyst with high charge storage capacity that can still operate effectively under low light flux after sunset and promote charge carrier separation is a promising strategy. Herein, by selecting SrAl 2 O 4 :Eu 2+ /Dy 3+ persistent phosphors as electron-trapped centers and g-C 3 N 4 semiconductor as visible-light photocatalyst, SrAl 2 O 4 :Eu 2+ /Dy 3+ @g-C 3 N 4 composite has been successfully synthesized via in-situ growth strategy to form a conventional type II heterojunction photocatalyst. Benefiting from the excellent ability of charge storage and release from electron traps and the improved electron-hole separation efficiency, the designed round-the-clock photocatalyst exhibits the improved hydrogen production from 153.8 μmol g −1 h −1 to 560 μmol g −1 h −1 under visible-light irradiation, infrared-light-driven H 2 production of 932 μmol g −1 for 3 h and a dark activity of 269.1 μmol g −1 h −1 lasing for 0.5 h. This work provides a promising strategy for designing a highly efficient photocatalyst for wide-spectral-responsive and all-weather photocatalytic hydrogen production.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Long Kong,Zhichun Li,Shouqiang Huang,Jinping Jia,Liang Li
Semiconductor quantum dots (QDs) are interesting photocatalysts for solar fuel production and environmental pollution control. However, the poor stability and recombination probability of photogenerated electron-hole pairs prevented the practical applications of QDs based photocatalysts. Herein we demonstrated that the incorporation of amorphous titania (TiO 2 ) coatings with CuInS 2 /ZnS-TiO 2 heterostructures (CIS/ZnS-TiO 2 gel) can markedly boost photocatalytic performance and stability for Cr (VI) reduction. The promoted photocatalytic activity of CIS/ZnS-TiO 2 gel is associated with the enhanced light-absorption and distinctive heterojunction imposed by the integration of CIS/ZnS-TiO 2 with amorphous TiO 2 coatings, which drastically speed the separation of photogenerated electron-hole pairs. Moreover, the physical protection and photocorrosion-inhibition functions (receptors of photogenerated holes from CIS/ZnS QDs) arised from the amorphous TiO 2 coatings were mainly responsible for the promoted photostability of CIS/ZnS-TiO 2 gel. Our CIS/ZnS-TiO 2 gel retained over 90% of its initial activity under cycle tests, while the bared CIS/ZnS-TiO 2 showed a distinct reduction (approximately 35%) of its original efficiency due to the photocorrosion and weight-loss. Obviously, the incorporation of amorphous TiO 2 along with its bulk appearance of gel realized the enhanced photocatalytic performance with a favorable cycling stability. This strategy could be extended to other QDs-based photocatalysts in improving photocatalytic performance toward practical application.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）