ChemSusChem
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2024
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IF 7.5
Chen Liao,Hongwei Zhou,Shunxin Zhang,Feng Wang,Ya Liu,Liejin Guo
Graphical A highly effective photocatalytic system (V Cu −CuInS 2 /MXene) was developed for transforming CO 2 into acetate under full spectrum irradiation. The incorporation of the LSPR effect and defect engineering leads to a highly selective system. Photocatalytic CO 2 conversion towards C 2+ fuels is a promising technology for simultaneously achieving carbon neutrality and alleviating the energy crisis. However, this strategy is inefficient due to the difficulty of both multi-electron transfer and C−C coupling during C 2+ formation. In this work, CuInS 2 /MXene heterostructure with Cu vacancy is rationally designed by in situ hydrothermal synthesis. The V Cu −CuInS 2 /MXene heterostructure has a suitable band structure and tight interface contact. Catalytic performances under different testing conditions, in situ spectroscopy, and COMSOL simulation reveal that LSPR-activated MXene promotes the formation of crucial intermediate CH 2 * and triggers the C−C coupling process under near-infrared light, as the key to acetate. Moreover, in situ XPS analysis, DFT calculations, and photoelectrochemical characterizations unveil that copper vacancy can promote charge transfer from CuInS 2 to MXene and boost local electron aggregation on the MXene, further enhancing the photocatalytic efficiency and selectivity of C 2 products. Contributing to the synergistic effect of copper vacancy and plasmonic MXene, V Cu −CuInS 2 /MXene achieved excellent CO 2 RR activity with an acetate evolution rate of 250.0 μmol/h/g and a selectivity of 97.5 % under the full spectrum irradiation, which is 38.8 and 3.3 times higher than that of V Cu −CuInS 2 and CuInS 2 /MXene, respectively.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
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IF 13
Zhihao Wang,Yongyi Lu,Guangdi Zhang,Lingfeng Quan,Mingzu Liu,Haimei Liu,Yonggang Wang
Due to their significant capacity and reliable reversibility, transition metal sulphides (TMSs) have received attention as potential anode materials for sodium-ion batteries (SIBs). Nonetheless, a prevalent challenge with TMSs lies in their significant volume expansion and sluggish kinetics, impeding their capacity for rapid and enduring Na + storage. Herein, a Cu 1.96 S@NC nanodisc material enriched with copper vacancies is synthesised via a hydrothermal and annealing procedure. Density functional theory (DFT) calculations reveal that the incorporation of copper vacancies significantly boosts electrical conductivity by reducing the energy barrier for ion diffusion, thereby promoting efficient electron/ion transport. Moreover, the presence of copper vacancies creates ample active sites for the integration of sodium ions, streamlines charge transfer, boosts electronic conductivity, and, ultimately, significantly enhances the overall performance of SIBs. This novel anode material, Cu 1.96 S@NC, demonstrates a reversible capacity of 339 mAh g −1 after 2000 cycles at a rate of 5 A g −1 . In addition, it maintains a noteworthy reversible capacity of 314 mAh g −1 with an exceptional capacity retention of 96% even after 2000 cycles at 20 A g −1 . The results demonstrate that creating cationic vacancies is a highly effective strategy for engineering anode materials with high capacity and rapid reactivity.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2021
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IF 6.057
Chang Ping Yang,Qing Wu,Zhong Wei Jiang,Xue Wang,Cheng Zhi Huang,Yuan Fang Li
Defect engineering in the photoelectrochemical (PEC) process of photoelectrodes has been extensively studied. But insufficient attention has been received about the impact of metal vacancies (V M ) in PEC process. Herein, the influence of Cu vacancies (V Cu ) on PEC performance of copper oxide (CuO) derived from Cu-based metal-organic gel (Cu-MOG) precursor was reported. It can be found that the presence of more V Cu can improve the PEC activity of CuO photocathode by facilitating the charge separation and transfer. Moreover, the as-prepared CuO was presented as a new PEC sensor to detect l -cysteine (L-Cys) on the basis of the excellent PEC performance, which showed high sensitivity and selectivity. Good linear response of L-Cys within the range of 0.1–6 μM was performed with a detection limit of 0.04 μM. This work not only provides insights into the role of V M in the PEC process of photocathodes, but also proved the high potential applicability of CuO as a PEC device for biomolecule detection.
研究领域:
材料科学
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生物传感
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缺陷工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Tian Sang,Yan Zhong,Chao-Hao Hu,Dian-Hui Wang,Tao Huang,Sheng Jiang,Hao Liu,Wen-Yi Wang,Ni-Ni Wei
A novel SrCu□O□ photocatalyst containing Cu vacancy and O vacancy was synthesized for the first time based on solid-phase sintering. The crystal structure, elemental composition, microscopic morphology, optical properties and energy band structure of the samples were characterized and analyzed in detail. The vacancies in the material were determined by ICP-MS and EPR, first-principles calculations showed that the introduction of vacancies extends the forbidden band of the photocatalytic to the visible band. The photocatalytic performance of SrCu□O□ was evaluated by degrading MB and TC HCI. Our results show that SrCu□O□ enhances the degradation performance of organic compounds due to rich vacancies that promote electron-hole pair separation and improve photogenerated carrier separation efficiency. Vacancy-containing metal oxide catalysts have broad application value in environmental remediation.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）