CRYSTENGCOMM
·
2017
·Vol. 19
·期 44
·6644-6650
·
IF 3.474
Ying-Jie Jia,Yi-Gang Chen,Xiao-Ni Yao,Xian-Ming Zhang
A series of alkali earth cadmium selenites including MgCd3(SeO3)4 (1), Ca0.7Cd2.3(SeO3)3 (2), SrCd(SeO3)2 (3) and BaCd(SeO3)2 (4) are synthesized by hydrothermal reaction and studied in detail by single crystal and powdered X-ray diffractions, thermal analyses, IR and UV spectral measurements and dipole moment calculation. 1 features a 3D anionic [Cd3(SeO3)4]2− framework constructed from isolated SeO3 trigonal pyramids and 2D [Cd3O12]n layers, in which the [Cd3O12]n layer is composed of edge-shared [Cd2O10]16− dimers and butterfly-like [Cd4O20]32− tetramers. 2 shows a smooth 2D [Cd2(SeO3)3]n layer composed of unique [Cd(SeO3)]n double chains. 3 exhibits a wavelike 2D [Cd(SeO3)2]n layer constructed from corner-shared CdO6 octahedra and isolated SeO3 trigonal pyramids. 4 displays a windmill-like 1D [Cd(SeO3)2]n chain built from zigzag [CdO4]n chain motifs and isolated SeO3 trigonal pyramids. The alkali earth oxide motifs demonstrate interesting and regular changes from isolated MgO6 octahedra, CaO7 polyhedra, and SrO9 tri-capped trigonal prisms based on a ribbon chain to BaO12 icosahedra based on a brucite-like layer, and meanwhile the SeO3 groups are observed from variable tetradentate to hexadentate coordination modes. These flexible motifs reveal that cadmium selenites are strongly affected by the size of the alkali earth cations, providing a feasible approach to modulating their space structure via selection of template cation.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xingyue Wu,Baozhu Yang,Yiping Qiu,Junyao Li,Yong Qin,Yong Kong
Three-dimensional (3D) Mo-doped CuCoSe (Mo-CuCoSe) nanoflowers and zero-dimensional (0D) CdSe nanodots are successively grown on the surface of one-dimensional (1D) CuO nanowires through a two-step electrodeposition strategy. As the supporting matrix, the 1D CuO nanowires can greatly alleviate the aggregation of the Mo-CuCoSe. The 3D Mo-CuCoSe nanoflowers show unique hydrangea-like structure, which can not only enhance the diffusion of electrolyte ions/electrons, but also facilitate the Faraday redox reactions. The 0D CdSe nanodots play a pivotal role in the enhancement of capacitance retentions. Due to the synergistic effect of CuO nanowires, Mo-CuCoSe nanoflowers and CdSe nanodots, the multi-dimensional CuO/Mo-CuCoSe/CdSe shows a high specific capacitance of 4600 mF cm −2 (at 1.0 mA cm −2 ) and excellent cyclic stability. Further, activated carbon (AC) and the multi-dimensional CuO/Mo-CuCoSe/CdSe are assembled to construct an asymmetric supercapacitor (ASC), which exhibits a maximum energy density of 30.3 Wh kg −1 at 214.2 W kg −1 .
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Lin Wei,Deqian Zeng,Jieqian Liu,Hongfei Zheng,Toyohisa Fujita,Minyi Liao,Chunyi Li,Yuezhou Wei
Metal selenide semiconductors have been rarely used for photocatalytic water splitting because of their poor stability and severe photocorrosion properties. Hence, designing stable metal selenides with suitable bandgap energies has considerable practical significance in photocatalytic H 2 evolution. In this work, a novel series of Zn x Cd 1-x Se (x = 0 ∼ 1) with tunable band structure were fabricated through a simple solvothermal method. Impressively, the ZnSe exhibited a maximum H 2 production rate of 1056 µmol g −1 h −1 , which was higher than that of CdSe and Zn x Cd 1-x Se solid solutions. Such visible-light photoactivity for water reduction to H 2 was attained even after 6 cycling photocatalytic experiments. Moreover, the two-dimensional (2D) Ni 2 P nanosheets act as a high-efficiency cocatalyst integrated with Zn x Cd 1-x Se semiconductor to boost photocatalytic H 2 generation performance. The optimal 8% Ni 2 P/ZnSe composites displayed excellent cycling stability and superior photocatalytic H 2 evolution performance (4336 µmol g −1 h −1 ), which was about 4.1 times that of pure ZnSe under visible light irradiation. Photoelectrochemical (PEC), photoluminescence (PL), and time-resolved photoluminescence (TRPL) measurements reveal that the improved photoactivity Ni 2 P/ZnSe photocatalysts were ascribed to the effective separation and migration of photoinduced carriers. The present work paves a pathway to explore the fabrication of Zn x Cd 1-x Se solid solutions and the hybridization of 2D transition metal phosphides nanosheets toward photocatalytic applications.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Yun Zheng,Yikai Wang,Yilin Chen,Yayun Wang,Xiaoping Rao,Kang Sun,Jianchun Jiang,Chaochao Qin
The step-scheme (S-scheme) heterojunction shows the merits of controlling the directional transfer of photogenerated charge carriers and realizing a strong redox potential for photocatalytic hydrogen evolution and carbon dioxide reduction. In this paper, a zero/two-dimensional (0D/2D) S-scheme heterojunction composed of cadmium selenide quantum dots and covalent triazine frameworks (CdSe/CTF) is designed and fabricated by an electrostatic self-assembly approach. Compared with pristine CTF and CdSe quantum dots, the photocatalytic activities of CdSe/CTF composites for hydrogen evolution, carbon dioxide reduction and terpene oxidation are significantly enhanced. The hydrogen evolution rate of CdSe/CTF hybrid photocatalyst immobilized with platinum nanoparticles as cocatalyst reached 19.0 mmol g −1 h −1 under visible-light irradiation, and the apparent quantum yield is 9.8 % at 420 nm. The CdSe/CTF hybrid also exhibited more superior photocatalytic activity in carbon dioxide reduction with a carbon monoxide evolution rate of 1.48 mmol g −1 h −1 , and presented higher photocatalytic reactivity in the selective oxidation of α -terpinene to p -cymene. The remarkable enhancement of photocatalytic performance for CdSe/CTF composite is mainly attributed to the facilitated separation and transfer of photoexcited charge carriers of 0D/2D S-scheme heterojunction. This work provides an in-depth insight of utilizing semiconducting polymers as a suitable platform to sustainably transform inexhaustive solar energy to storable chemical energy.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Yun-Xiang Ma,Ya-Ping Gong,Chun-li Hu,Jiang-Gao Mao,Fang Kong
Three new d 10 transition metal selenites containing PO 4 tetrahedron, namely, Cd 7 (HPO 4 ) 2 (PO 4 ) 2 (SeO 3 ) 2 ( 1 ), Cd 6 (PO 4 ) 1.34 (SeO 3 ) 4.66 ( 2 ) and Zn 3 (HPO 4 )(SeO 3 ) 2 (H 2 O) ( 3 ), have been synthesized by hydrothermal reaction . They feature three different structural types. Compound 1 exhibits a novel 3D network composed of 3D cadmium selenite open framework with phosphate groups filled in the 1D helical tunnels. The structure of compound 2 displays a new 3D framework consisted of 2D cadmium oxide layers bridged by SeO 3 and PO 4 groups. Compound 3 is isostructural with the reported solids of Co 3 (SeO 3 ) 3-x (PO 3 OH) x (H 2 O) when x is equal to 1.0. Its structure could be viewed as a 3D zinc oxide open skeleton with SeO 3 and HPO 4 polyhedra attached on the wall of the tunnels. They represent the only examples in metal selenite phosphates in addition to the above cobalt compounds. Optical diffuse reflectance spectra revealed that these solids are insulators, which are consistent with the results of band structure computations based on DFT algorithm.
研究领域:
无机化学
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材料科学
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固体化学
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产品关联
DOI
高影响因子
Nature Electronics
·
2020
·Vol. 3
·期 5
·251-258
·
IF 27.5
Zhou Wenjia,Shang Yuequn,García de Arquer F. Pelayo,Xu Kaimin,Wang Ruili,Luo Shaobo,Xiao Xiongbin,Zhou Xiaoyu,Huang Ruimin,Sargent Edward H.,Ning Zhijun
Upconversion photodetectors convert photons from the infrared to the visible light spectrum and are of use in applications such as infrared detection and imaging. High-performance upconversion devices are, however, typically based on vacuum-deposited materials, which are expensive and require high operating voltages, which limits their implementation in flexible systems. Here we report solution-processed optical upconversion photodetectors with a high photon-to-photon conversion efficiency of 6.5% and a low turn-on voltage of 2.5 V. Our devices consist of a colloidal lead sulfide quantum dot layer for harvesting infrared light that is monolithically coupled to a cadmium selenide/zinc selenide quantum dot layer for visible-light emission. We optimized the charge-extraction layers in these devices by incorporating silver nanoparticles into the electron transport layers to enable carrier tunnelling. Our photodetectors exhibit a low dark current, high detectivity (6.4 × 10 12 Jones) and millisecond response time, and are compatible with flexible substrates. We also show that the devices can be used for in vitro bioimaging.
研究领域:
光子学
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材料科学
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纳米技术
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光电子学
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生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）