ACS Nano
·
2023
·
IF 17.1
Yu Liu,Mingquan Li,Shanhong Wan,Khak Ho Lim,Yu Zhang,Mengyao Li,Junshan Li,Maria Ibáñez,Min Hong,Andreu Cabot
AgSbSe2 is a promising thermoelectric (TE) p-type material for applications in the middle-temperature range. AgSbSe2 is characterized by relatively low thermal conductivities and high Seebeck coefficients, but its main limitation is moderate electrical conductivity. Herein, we detail an efficient and scalable hot-injection synthesis route to produce AgSbSe2 nanocrystals (NCs). To increase the carrier concentration and improve the electrical conductivity, these NCs are doped with Sn2+ on Sb3+ sites. Upon processing, the Sn2+ chemical state is conserved using a reducing NaBH4 solution to displace the organic ligand and anneal the material under a forming gas flow. The TE properties of the dense materials obtained from the consolidation of the NCs using a hot pressing are then characterized. The presence of Sn2+ ions replacing Sb3+ significantly increases the charge carrier concentration and, consequently, the electrical conductivity. Opportunely, the measured Seebeck coefficient varied within a small range upon Sn doping. The excellent performance obtained when Sn2+ ions are prevented from oxidation is rationalized by modeling the system. Calculated band structures disclosed that Sn doping induces convergence of the AgSbSe2 valence bands, accounting for an enhanced electronic effective mass. The dramatically enhanced carrier transport leads to a maximized power factor for AgSb0.98Sn0.02Se2 of 0.63 mW m–1 K–2 at 640 K. Thermally, phonon scattering is significantly enhanced in the NC-based materials, yielding an ultralow thermal conductivity of 0.3 W mK–1 at 666 K. Overall, a record-high figure of merit (zT) is obtained at 666 K for AgSb0.98Sn0.02Se2 at zT = 1.37, well above the values obtained for undoped AgSbSe2, at zT = 0.58 and state-of-art Pb- and Te-free materials, which makes AgSb0.98Sn0.02Se2 an excellent p-type candidate for medium-temperature TE applications.
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Batteries-Basel
·
2023
·Vol. 9
·期 6
·307
·
IF 4
Deng Li,Huinan Pan,Zhonghai Lin,Xiulian Qiu,Xinyu Zhao,Wei Yang,Wenzhi Zheng,Fengming Ren
Compared with monometallic selenides, heterogeneous bimetallic selenides have rich phase boundaries and superior electrical conductivity. ZnSe/CoSe2composites were prepared by introducing Zn metal and using ZIF-8/67 as the precursor through the synergistic effect between Zn and Co after selenification. The electrocatalytic conversion of polysulfide is accelerated by ZnSe through chemical adsorption and the catalytic effect. The conductive CoSe2surface provides a rapid diffusion path for lithium ions, accelerating the conversion of the polysulfide. On the basis of their individual strengths, ZnSe and CoSe2can jointly promote the smooth adsorptive–diffuse–catalytic conversion process of polysulfide and induce the growth of lithium sulfide around its heterogeneous interface, thus enhancing the electrochemical performance of the lithium–sulfur battery cathode materials. The ZnSe/CoSe2–S electrode, at the optimal Zn-to-Co ratio of 1:1, has a 790.06 mAh g−1initial specific capacity at 0.2 C and excellent cycling stability at 1 C. After 300 cycles, the final capacity is 300.85 mAh g−1, and the capacity retention rate reaches 82.71%.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 3
·1372-1380
·
IF 3.3
Peng Sun,Menglu Zhang,Yue Liu,Jiahua Zhao,Jiawei Yang,Yufeng Wang,Yongfei Wang,Zhiqiang Zhang
Lithium-ion batteries have been regarded as a promising power source for various electronic devices. Compared to the traditional graphite anode material, MoSe2 possesses a higher theoretical capacity. However, MoSe2 anode materials are limited by low electronic conductivity and large volume changes during cycling. This study reports 1T–2H MoSe2/N-doped rGO nanocomposites, fabricated through a hydrothermal method. The 1T–2H MoSe2/N-doped rGO electrode delivers a high reversible capacity of 483.6 mA h g−1 after 1000 cycles at 1000 mA g−1. It also possesses a high reversible capacity of 474.9 mA h g−1 even at a current density of 2000 mA g−1, thus, making it an important potential lithium-ion battery anode.
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CARBON
·
2023
·
IF 10.9
Meng Ma,Qi Zheng,Xinci Zhang,Lin Li,Maosheng Cao
Electromagnetic radiation pollution has become a serious threat, which will harm human health and interfere with electronic devices. However, it is still a challenge to develop high-efficiency electromagnetic wave absorbers with wide frequency band and strong absorption, especially for realizing the features of multi-bands absorption. Herein, VSe 2 /CNTs nanocomposites were successfully synthesized with crosslinked CNTs distributed on VSe 2 nanoclusters composed of nanosheets . Importantly, the electromagnetic properties and absorption performance of the VSe 2 /CNTs nanocomposites can be effectively tailored by changing the hybrid ratio of CNTs and VSe 2 nanosheets (VSe 2 -NSs). The increase of CNTs content promotes the formation of a conductive network and leads to the increase of permittivity. The VSe 2 /CNTs nanocomposite with CNTs of 40 mg exhibits the best electromagnetic wave absorption performance, the minimum reflection loss ( RL ) reaches −57.53 dB at 5.52 GHz and is about 6 times more than VSe 2 -NSs. Meanwhile, the VSe 2 /CNTs nanocomposite with CNTs of 30 mg shows dual-bands absorption performance with a minimum RL value of −50.06 dB at 3.84 GHz and the total effective absorption bandwidth of 3.32 GHz. This result proves that VSe 2 /CNTs nanocomposites can be promising candidates as high-efficiency electromagnetic wave absorption material and provides a feasible idea for designing a high-performance electromagnetic wave absorber.
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SOLAR ENERGY
·
2023
·
IF 6.7
Yonggang Zhao,Congyan Xu,Na Yu,Zhineng Zhou,Yufei Chen,Xinghuan Hu,Ying Zhang,Shurong Wang
A mixed dimethyl sulfoxide (DMSO) and 2-methoxy ethanol (MOE) solvent system was developed to prepare high-quality kesterite Cu 2 ZnSn(S, Se) 4 (CZTSSe) film. The precursor films made pure DMSO system show a tube-like microstructure morphology, which can be changed by adding MOE to the solution. The increase of MOE in the precursor solution is a key in the crystalline characteristic of the absorber and connecting performance with thin film solar cells. As V MOE = V DMSO , the CZTSSe layer can achieve good contact with the back electrode and obtain large grains across layers. The addition of MOE solvent effectively improves the fill factor (FF). Specifically, both the fill factor and efficiency are increased from 49.67% and 6.43% to 64.83% and 10.99%, respectively, with the addition of 2 mL of MOE into precursor solution prepared by DMSO.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Guorong Wang,Guiquan Liu,Zhiliang Jin
Vanadium-based hydrotalcite materials have attracted much attention in supercapacitor electrodes due to their polyvalent properties. Nevertheless, the weak electrical conductivity of hydrotalcite limits its further development. In order to overcome this problem, nanoflowers P-NiV-LDHs-8 and Se-NiV-LDHs-1 were obtained by ingenious modification on the surface of nanoflower microlamellae of NiV-LDHs. Compared with Se-NiV-LDHs-x (x = 0.5, 2), P-NiV-LDHs-x (x = 4, 12), NiV-LDHs, Ni2P, and NiSe2, nanoflowers P-NiV-LDHs-8 and Se-NiV-LDHs-1 have better mass-specific capacity and corresponding rate performances. The self-assembled P-NiV-LDHs-8//AC and Se-NiV-LDHs-1//AC (AC = activated carbon) soft package devices have relatively superior energy density and power density. Moreover, the specific capacitance retention also maintains a relatively impressive level. It is proven that the interfacial modification has a positive effect on the energy storage performance of NiV-LDHs from the perspectives of phosphating and selenizing.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Wei Wang,Fengmin Zhong,Dun Wang,Yuqi Zhao,Dongdong Peng,Shuang Li,Qian Ning,Shengsong Tang,Cui-Yun Yu,Hua Wei
Hypothesis Construction of dual gatekeepers-functionalized mesoporous organic silica nanoparticles (MONs) with both physical and chemical mechanisms for modulated drug delivery properties provides one solution to the extracellular stability vs. intracellular high therapeutic efficiency of MONs that hold great potential for clinical translations. Experiments We reported herein facile construction of diselenium-bridged MONs decorated with dual gatekeepers, i.e. , azobenzene (Azo)/polydopamine (PDA) for both physical and chemical modulated drug delivery properties. Specifically, Azo can act as a physical barrier to block DOX in the mesoporous structure of MONs for extracellular safe encapsulation. The PDA outer corona serves not only as a chemical barrier with acidic pH-modulated permeability for double insurance of minimized DOX leakage in the extracellular blood circulation but also for inducing a PTT effect for synergistic PTT and chemotherapy of breast cancer. Findings An optimized formulation, DOX@(MONs-Azo3)@PDA resulted in approximately 1.5 and 2.4 fold lower IC50 values than DOX@(MONs-Azo3) and (MONs-Azo3)@PDA controls in MCF-7 cells, respectively, and further mediated complete tumor eradication in 4T1 tumor-bearing BALB/c mice with insignificant systematic toxicity due to the synergistic PTT and chemotherapy with enhanced therapeutic efficiency.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ming Xu,Yu Ma,Rong Liu,Huanhao Xiao,Liming Chen,Ziqiang Zhang,Lei Wang,Guohui Yuan
The electrochemical battery performance is largely determined by electron transport occurring in the electrode materials . The microsphere-structured transition metal selenides (TMSes) with high tap density are prospective anode materials for commercial sodium ion batteries (SIBs), however, they suffer from sluggish electron transport, leading to poor rate and inadequate cycle stability. Herein, a carbon nanotubes (CNTs) intercalation strategy is firstly proposed to enhance the electron transport kinetics in FeSe 2 microspheres via a facile method. In the obtained CNTs@FeSe 2 -C composite, the FeSe 2 microspheres composed of FeSe 2 nanoparticles feature high tap density and short Na + diffusion distances, while the CNTs networks enable pathways for fast electron transfer in the FeSe 2 microspheres. In consequence, the CNTs@FeSe 2 -C delivers high volumetric/gravimetric capacity (885.4 mAh cm −3 , 530.2 mAh g −1 ), an ultra-long lifespan (234.5 mAh g −1 after 10,000 loops at 10 A g −1 ), and a superior rate performance (57.8% capacity retention at the current density increase of 150 times). Ex-situ XRD, XPS, Raman, TEM and quantitative kinetics analyses are further conducted to reveal the energy storage mechanism underlying the enhanced electrochemical properties of CNTs@FeSe 2 -C. This work demonstrates that the proposed strategy could optimize metal selenides as commercial-value anodes for SIBs.
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Journal of Energy Storage
·
2023
·
IF 9.4
Ling Wang,Miaoling Hu,Changzheng Lin,Jiangtao Feng,Wei Yan
Transition metal chalcogenide anodes have attracted significant attention for sodium-ion batteries (SIBs) owing to their relatively high theoretical capacity. However, the inherently poor electronic conductivity and rate performance hinder their practical application. In this study, hierarchically structured CoSe 2 /TiN/nitrogen-doped carbon nanofibers wrapped with in-situ grown carbon nanotubes (CNTs) on the surface (denoted as CoSe 2 @N-TCF/CNTs) are designed and fabricated as binder-free anodes for SIBs. The rational design can effectively avoid the agglomeration of CoSe 2 nanoparticles, improve the conductivity of the composite materials, provide enough space for electrolyte penetration and volume expansion during the cycling process and shorten the transmission paths of electrons and Na + . With these structural and compositional advantages, the as-obtained hierarchical CoSe 2 @N-TCF/CNTs deliver a high reversible capacity of 401.2 mAh g −1 after 1000 cycles at 0.2 A g −1 and maintained at 353.7 mAh g −1 even at a high current density of 2 A g −1 when directly used as a binder-free anode for SIBs. The superior sodium-ion storage performance can be attributed to the decreased charge transfer resistance , improved Na + diffusion rate and the pseudocapacitance behavior, as is evidenced by kinetics analysis .
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Feiyang Sun,Shengyi Yang,Zhenheng Zhang,Sulaman Muhammad,Zhenhua Ge,Jinming Hu,Chunyang Li,Ying Wu,Xiaoxuan Liu,Bingsuo Zou
Lead selenide colloidal quantum dots (CQDs) are widely used in infrared photodetectors due to their size-dependent bandgap tunability, facile solution-processing techniques and low cost. Heterojunctions (HJs) are usually used to construct device to facilitate the separation of excitons and the transportation of photogenerated carriers. Based on the solution-processed HJ photodetector ITO/ZnO/PbSe/Ag, in which PbSe CQDs layer acts as the active layer and ZnO nanoparticles (NPs) layer as the electron-transporting layer, a greatly enhanced-performance was obtained after inserting 10 nm Ag NPs layer within the ZnO NPs layer close to the HJ ZnO/PbSe interface. By optimizing the concentration of Ag NPs solutions and the location of Ag NPs thin layer in ZnO film, the maximum responsivity of the self-driven HJ photodetector ITO/ZnO(50 nm):Ag-NPs(10 nm):ZnO(50 nm)/PbSe(300 nm)/Ag reaches to 6.25 mA/W with a specific detectivity D * of 5.17 × 10 11 Jones under 8.5 μ W / c m ² 1550 nm illumination at zero bias. Further, the underlain physical mechanisms for the enhanced-performance were discussed in details. In this way, it provides a very efficient method for enhanced-performance self-driven HJ photodetectors by inserting a thin layer of metal NPs into the electron-transporting layer close to the heterojunction interface.
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Light-Science & Applications
·
2023
·Vol. 12
·期 1
·1-10
·
IF 19.4
Gu Kai,Zhong Haizheng
Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy harvesting. As a fundamental property of materials, accurate measurement of light-to-heat conversion efficiency (LHCE) is of vital importance in developing advanced materials for photothermal applications. Herein, we report a photothermal and electrothermal equivalence (PEE) method to measure the LHCE of solid materials by simulating the laser heating process with electric heating process. The temperature evolution of samples during electric heating process was firstly measured, enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal equilibrium. The LHCE of samples can be calculated under laser heating with the consideration of heat dissipation coefficient. We further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements, supporting the obtained small error within 5% and excellent reproducibility. This method is versatile to measure the LHCE of inorganic nanocrystals, carbon-based materials and organic materials, indicating the applicability of a variety of materials.
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ACS Nano
·
2023
·
IF 17.1
Tong Yuan,Jitong Yan,Qingfeng Zhang,Yong Su,Shuhong Xie,Bingan Lu,Jianyu Huang,Xiaoping Ouyang
The conversion and alloying-type anodes for potassium-ion batteries (PIBs) have drawn attention. However, it is still a challenge to relieve the huge volume expansion/electrode pulverization. Herein, we synthesized a composite material comprising Bi0.48Sb1.52Se3 nanoparticles uniformly dispersed in carbon nanofibers (Bi0.48Sb1.52Se3@C). Benefiting from the synergistic effects of the high electronic conductivity of Bi0.48Sb1.52Se3 and the mechanical confinement of the carbon fiber that buffers the large chemomechanical stress, the Bi0.48Sb1.52Se3@C//K half cells deliver a high reversible capacity (491.4 mAh g–1, 100 cycles at 100 mA g–1) and an extraordinary cyclability (80% capacity retention, 1000 cycles at 1000 mA g–1). Furthermore, the Bi0.48Sb1.52Se3@C-based PIB full cells achieve a high energy density of 230 Wh kg–1. In situ transmission electron microscopy (TEM) reveals an intercalation, conversion, and alloying three-step reaction mechanism and a reversible amorphous transient phase. More impressively, the nanofiber electrode can almost return to its original diameter after the potassiation and depotassiation reaction, indicating a highly reversible volume change process, which is distinct from the other conversion type electrodes. This work reveals the stable potassium storage mechanisms of Bi0.48Sb1.52Se3@C composite material, which provides an effective strategy to enable conversion/alloying-type anodes for high performance PIBs for energy storage applications.
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