ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Siping Li,Gangyong Li,Zhi Li,Wenyuan Xu,Liang Chen,Wei Wang,Binhong He,Minjie Zhou,Zhaohui Hou
Transition metal selenides (TMSs) become one of the most promising cathode materials for rechargeable aluminum batteries (RABs) due to the advantages of high specific capacity, low cost, and simple preparation process. However, TMSs are soluble in the acidic chloroaluminate ionic liquid electrolyte during cycling, leading to undesirable electrochemical performance. Herein, rechargeable Al-Cu 2 Se batteries are fabricated with acetylene black modified separator (AB/GF/A) showing excellent electrochemical performance with capacity retention of 95 mAh g −1 after 5000 cycles at 0.5 A g −1 and 166.1 mAh g −1 at 1.0 A g −1 . By combining electrochemical tests and ex situ spectroscopy and electronic microscope characterizations, it is revealed that the dissolved Cu and Se species adsorbed on the surface of AB/GF/A still remain electroactivity, which transforms the diffusion-controlled mechanism of Cu 2 Se to surface pseudocapacitance-controlled behavior, thus suppressing the shuttle effects and boosting the reaction kinetics. The in-depth understanding of the functionalized separator in energy storage mechanism of TMSs could provide reference for further progress of RABs in the future work.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hongyi Chen,Qiming Liu,Shiyue Cao
Owing to the desirable nano-morphology, controllable structure, and ease of preparation, metal–organic frameworks (MOFs) are widely used as the precursors for electrodes in Na-ion battery (NIB). However, MOF structures are prone to fracture and collapse during the reactions. Additionally, MOF-derived electrodes often exhibit a high expansion rate, which negatively impacts the long cyclic capability of NIBs. Herein, we employed a stable covalent-organic framework (COF) as a protective coating for the first time to preserve the MOF structure. A shuttle-like iron selenide (Fe 3 Se 4 ) coated with N-doped carbon (NC) was synthesized using a simple hydrothermal method, surface coating, and subsequent selenizing process. Due to its large specific surface area and well-developed porosity, the double-framework derived Fe 3 Se 4 /NC electrode provides abundant active sites for Na + storage. The COF and COF-derived NC protect the structure of Fe 3 Se 4 /NC during synthesis and cyclic process, respectively. The high conductivity of the NC coating enhances the electron/ion conductivity of Fe 3 Se 4 /NC, thereby beneficial the rate performance. As the material anode for NIB, the Fe 3 Se 4 /NC electrode exhibits a high initial charging/discharging capacity (425.7/478.4 mAh·g −1 with an initial Coulombic efficiency of 89.0 %), excellent rate performance (333.5 mAh·g −1 at 12 A·g −1 ), long-durable cycle capability (290.8 mAh·g −1 after 1000 cycles at 8 A·g −1 ) and fast charging ability (143 s). This work provides a novel strategy of “COF on MOF” to prepare high-performance electrode materials for NIB.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 29
·15833-15843
·
IF 11.9
Yi Tao,Zikun Tang,Yihong Zhong,Dequan Bao,Zhenqiu Gao,Wei Zhao,Zhen Wen,Hao Zhang,Kanghong Wang,Xuhui Sun
Photoelectrochemical (PEC) water splitting is a promising approach for the conversion of solar energy to hydrogen fuel. However, the solar-to-hydrogen (STH) efficiency is still restricted by the kinetically sluggish oxidation reaction on the surface of the photoanode. Herein, a unique composite structure (ZnO@NiO–QDs) was developed as the photoanode, in which the highly dispersed ZnO (d-ZnO) particles derived from the pyrolysis of ZIF-8 serve as the scaffolds to support NiO (cocatalysts) and colloidal CdSe(CdSexS1−x)4(CdS)2 QDs (denoted as CAS, a light absorber). Due to the enhanced hole consumption accelerated by NiO cocatalysts, the optimized photoanode (d-ZnO@NiO0.03–CAS) exhibits a higher saturated current density (Jsc) of 21.7 mA cm−2 than the d-ZnO–CAS photoanode (15.6 mA cm−2) under standard one sun (AM 1.5 G, 100 mW cm−2) solar irradiation. More importantly, such an electrode can still work as an electrocatalyst under light-off conditions via a sole electrochemical (EC) process. Thus, a well-designed bifunctional electrode that integrates cocatalysts and light absorbers makes it possible to generate hydrogen efficiently under both light-on and light-off conditions, providing an efficient and low-cost paradigm to improve the hydrogen evolution performance.
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Small
·
2023
·Vol. 19
·期 45
·2303247
·
IF 13.3
Yuhe Bi,Sheng Cao,Peng Yu,Zhentao Du,Yunjun Wang,Jinju Zheng,Bingsuo Zou,Jialong Zhao
High color purity blue quantum dot light-emitting diodes (QLEDs) have great potential applications in the field of ultra-high-definition display. However, the realization of eco-friendly pure-blue QLEDs with a narrow emission linewidth for high color purity remains a significant challenge. Herein, a strategy for fabricating high color purity and efficient pure-blue QLEDs based on ZnSeTe/ZnSe/ZnS quantum dots (QDs) is presented. It is found that by finely controlling the internal ZnSe shell thickness of the QDs, the emission linewidth can be narrowed by reducing the exciton-longitudinal optical phonon coupling and trap states in the QDs. Additionally, the regulation of the QD shell thickness can suppress the Förster energy transfer between QDs in the QLED emission layer, which will help to reduce the emission linewidth of the device. As a result, the fabricated pure-blue (452 nm) ZnSeTe QLED with ultra-narrow electroluminescence linewidth (22 nm) exhibit high color purity with the Commission Internationale de l'Eclairage chromatic coordinates of (0.148, 0.042) and considerable external quantum efficiency (18%). This work provides a demonstration of the preparation of pure-blue eco-friendly QLEDs with both high color purity and efficiency, and it is believed that it will accelerate the application process of eco-friendly QLEDs in ultra-high-definition displays.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Wenrui Wu,Yue Yan,Yingsong Yu,Xing Wang,Tao Xu,Xianfu Li
Transition metal selenides (TMSs) are viewed as a prospective high-capacity electrode material for asymmetric supercapacitors (ASCs). However, the inability to expose sufficient active sites due to the limitation of the area involved in the electrochemical reaction severely limits their inherent supercapacitive properties. Herein, a self-sacrificing template strategy is developed to prepare self-supported CuCoSe (CuCoSe@rGO-NF) nanosheet arrays by in situ construction of copper-cobalt bimetallic organic framework (CuCo-MOF) on rGO-modified nickel foam (rGO-NF) and rational design of Se 2- exchange process. Nanosheet arrays with high specific surface area are considered to be ideal platforms for accelerating electrolyte penetration and exposing rich electrochemical active sites. As a result, the CuCoSe@rGO-NF electrode delivers a high specific capacitance of 1521.6 F/g at 1 A/g, good rate performance and an excellent capacitance retention of 99.5% after 6000 cycles. The assembled ASC device has a high energy density of 19.8 Wh kg −1 at 750 W kg −1 and an ideal capacitance retention of 86.2% after 6000 cycles. This proposed strategy offers a viable strategy for designing and constructing electrode materials with superior energy storage performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xichen Liu,Jianghao Wang,Yating Zhang,Dongzhi Zhang
A high-performance hydrogen sulfide sensor is introduced in this paper. CuO/MoSe 2 nanocomposites were synthesized using a simple hydrothermal method , and the sensing properties of CuO/MoSe 2 composite films for H 2 S gas were investigated at 75 °C. The gas sensor test results revealed that the CuO/MoSe 2 composite membrane sensor outperforms the single material sensor in terms of response, response/recovery time, linearity, and long-term stability. The enhanced gas sensitivity of the CuO/MoSe 2 nanocomposite could be attributed to the synergistic effect of the two materials' p-p heterojunction . Using DFT simulation, it was also shown that the CuO/MoSe 2 composite sensor's ability to adsorb H 2 S is superior to that of CuO and MoSe 2 used alone.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Li-Wen Jiang,Long Chen,Yong-Zheng Wu,Hong Liu,Jian-Jun Wang
Transition metal selenides possess unique electronic properties and functional tunability, making them promising electrocatalysts for various applications. However, the structure evolution of cobalt selenide and its effect on catalytic activity and stability under alkaline hydrogen evolution reaction (HER) have not been fully understood. Herein, this study investigates the structure evolution, catalytic activity, and stability of Co 3 Se 4 electrodes under alkaline HER. Continuous Se leaching transforms Co 3 Se 4 into Co(OH) 2 during HER, leading to an activation process in the early stage and a decay process in the later stage. Adding SeO 3 2− ions in the electrolyte effectively inhibits Se leaching and excessive hydroxylation, enhancing stability. Mechanistic studies show that SeO 3 2− added to the electrolyte can increase the concentration of SeO 3 2− ions in the electric double layer to regulate the dynamic balance of Se leaching. This work provides insight into structure evolution, dynamic activity regulation, and stability of electrode materials during electrochemical reduction processes.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Kai Wang,Ku-Han Deng,Yi-Shen Tian,Meng-Ying Sun,Zi-li Yu,Zhi-Quan Tian,Zhi-Ling Zhang
Fluorescence in the near infrared IIb window (NIR-IIb, 1500–1700 nm) shows higher signal-to-noise ratio, better space-time resolution, and deeper tissue penetration. However, materials with excellent fluorescence properties in the NIR-IIb region were rarely reported. Ag2Te quantum dots (QDs) could emit variable fluorescence in the NIR-II window due to their narrow band gap. Unfortunately, the fluorescence in the NIR-IIb region was not strong enough to image in vivo because the lattice defects on the surface of Ag2Te increased non-radiative transitions and decreased fluorescence performance. In this work, we coated a Ag2Te core with a Ag2Se shell to passivate the lattice defects and enhance its fluorescence efficiency. The fluorescence property of the as-prepared Ag2Te/Ag2Se core/shell QDs is more than 10 times stronger than that of Ag2Te. The brighter Ag2Te/Ag2Se QDs showed high-resolution in vivo imaging in the NIR-IIb region to distinguish thin blood vessels up to 66 μm. Overall, Ag2Te/Ag2Se QDs with excellent fluorescence in the NIR-IIb region were prepared and showed great potential for biomedical imaging.
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Huyue Cao,Kaili Geng,Xinzhe Yan,Hangkai Qiu,Shan Lin,Chaoqing Dai,Wei Liu,Yueyue Wang
Tetracycline hydrochloride (TC-HCl) as an antibiotic is widely used in our daily life, but it has posed potential threats to the ecological environment for flowing into the natural environment. To address this issue, The photoelectrochemical (PEC) sensor is first developed for the detection of TC-HCl by comparing and analyzing ternary Bi 2 (Te 1-x Se x ) 3 nanomaterials prepared through different ratios of hydrothermal methods. Specifically, the Bi 2 (Te 1-x Se x ) 3 /Indium tin oxide (ITO) electrode can interact with TC-HCl rapidly and selectively which results in a significant reduction of the photocurrent signal. By regulating the ratio of x, it is found that Bi 2 Te 2.85 Se 0.15 /ITO have the best stability and the fastest response time in the detection of TC-HCl. The response/recovery speed of the sensor to TC-HCl is fast to 0.23 s, a low detection limit of 0.08 pmol/l (S/N = 3) and a linear detection fit of up to R 2 = 0.992. Moreover, the sensor has good stability and specificity for TC-HCL detection, providing a new perspective for the development of PEC sensors.
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Nanping Zhong,Jianghao Xing,Jia He,Xinyu Zhao,Xianwen Wang,Haowei Xue
Oral squamous cell carcinoma (OSCC) produces malignant tumours in the oral cavity and adjacent anatomical structures, ranking sixth among the 11 most common malignant tumours in the body. The poor surgical outcomes for OSCC have led to increasing interest in nanomedicines. Major challenges with concentration-dependent therapies include the effective and precise delivery of gases to the lesion and combination with other therapies to achieve precise treatment. Herein, novel Cu 2 Se nanosheets (Cu 2 Se NSs) were ingeniously synthesized and enveloped with a thermosensitive nitric oxide (NO) supplier (sodium nitroprusside dihydrate, SNP) within a sodium alginate (ALG) hydrogel matrix to effectively eradicate tumours by combining photothermal therapy (PTT) and gas therapy (GT). The Cu 2 Se NSs reduced the glutathione (GSH) present in high concentrations to glutathione disulfide (GSSG), effectively killing squamous cell carcinoma cells under 1064 nm laser irradiation. Moreover, the Cu 2 Se NS hydrogel wrapped with SNP exhibited good NIR-controlled NO release behaviour, thus realizing the combined application of PTT and GT. PTT along with NO release is expected to improve the antitumour effect and provide new solutions for treating OSCC.
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ENERGY & FUELS
·
2023
·
IF 5.3
Peng Xu,Hongrui Wang,Siqi Guo,Zuoming He,Gengcheng Liao,Ningyan Cheng,Yundan Liu,Bin-Wei Zhang
The development of affordable and efficient catalysts for seawater hydrogen evolution is highly desirable but presents significant challenges. In this study, we prepared an exceptionally efficient electrocatalyst, atomic Ru-doped Ni0.85Se supported on carbon cloth (Ru–Ni0.85Se/CC–12 h), for the hydrogen evolution reaction (HER) in both a 1 M KOH solution and an alkaline-simulated seawater environment (1 M KOH and 0.5 M NaCl). Notably, Ru–Ni0.85Se/CC–12 h exhibited excellent performance with remarkably low overpotentials of 34.1 and 44.2 mV at 10 mA/cm2 in the 1 M KOH solution and the alkaline-simulated seawater environment, respectively. Furthermore, it demonstrated remarkable durability, showing negligible performance degradation even after continuous 18 h at 10 mA/cm2. The outstanding HER performance of Ru–Ni0.85Se/CC–12 h in both alkaline solution and alkaline-simulated seawater can be attributed to the atomic Ru doping in Ni0.85Se, which modifies its geometric and electronic structure, thereby enhancing its activity and resistance to chloride ion poisoning and erosion simultaneously.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2023
·Vol. 26
·期 24
·e202300303
·
IF 2.3
Youyang Xie,Pengtao Sheng,Weili Li,Yanling Li,Songtian Li
Graphical By changing Cu/In molar ratios of Cu−In−Se QDs from 0.3 : 1 to 0.9 : 1, the photoluminescence spectra displayed a remarkable red-shift from 700 nm to 1050 nm. Although there was a blue-shift after the introduction of Zn 2+ dopants. in Cu−In−Se QDs, a significant red-shift occurred from 660 nm to 760 nm when the Zn/Cu molar ratios decreased from 0.7 : 0.3 to 0.3 : 0.7. These results confirmed the strong effect of the Cu/In and Zn/Cu molar ratios on the intrinsic and dopants states related-transition channels, including the band-edge, conduction band-intragap acceptor, as well as the donor-acceptor. The large structural tolerance of I–III–VI group quantum dots (QDs) to off-stoichiometry allows their photoluminescence properties to be adjusted via doping, thereby enabling application in different fields. However, the photophysical processes underlying their photoluminescence mechanism remain significantly unknown. In particular, the transition channels of CuInSe 2 QDs, which are altered by intrinsic and extrinsic intragap states, remain poorly reported. Herein, we investigated the photophysical processes associated with intragap states via electrochemical and optical techniques by using copper deficient Cu−In−Se QDs as well as Zn doped Cu−In−Se QDs. When the Cu/In molar ratios of Cu−In−Se QDs increased from 0.3 : 1 to 0.9 : 1, the photoluminescence spectra displayed a red-shift from 700 nm to 1050 nm. Although there was a blue-shift after the introduction of Zn 2+ dopants in Cu−In−Se QDs, a significant red-shift occurred (from 660 nm to 760 nm) when the Zn/Cu molar ratios decreased from 0.7 : 0.3 to 0.3 : 0.7. The Gaussian deconvolution results of the photoluminescence spectra and the band gap derived from absorption spectra by fitting supported the fact that the optical transition channels are dependent on the Cu/In and Zn/Cu molar ratios. After the introduction of the Zn 2+ ions, the alloyed-resultant blue-shift of the emission spectra was observed, primarily due to the enlarged band gap; however, the radiative recombination of prominent intrinsic intragap states is still observed; and only a small proportion of the band-edge exciton undergoes recombination for the sample with low Zn content. Cyclic voltammetry measurements revealed well-defined extrinsic Zn Cu intragap states (Zn substitution on Cu sites) and intrinsic Cu x (x= 1+/2+) states in the band gap. The results presented here provide a better understanding of the varying effects of dopant on photoluminescence in terms of I–III–VI group QDs.
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