Journal of Materials Chemistry A
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2021
·Vol. 9
·期 11
·7248-7256
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IF 12.732
Peijia Wang,Jiajie Huang,Jing Zhang,Liang Wang,Peiheng Sun,Yefeng Yang,Zhujun Yao
Transition metal selenides have emerged as a class of promising anodes for sodium ion batteries (SIBs). However, the notorious issues of their low electrical conductivity and huge volume changes during sodium ion insertion/extraction lead to poor cycling stability and inferior rate capability. In this work, hierarchically core–branched iron cobalt selenide arrays coated with N-doped carbon shell (denoted as FeCo–Se@NC) were rationally designed and synthesized on carbon cloth through a combined strategy of hydrothermal, selenization and carbonization processes. Benefitting from the designed arrays with simultaneous Fe doping into the CoSe2 matrix and N-doped carbon coating, the optimized FeCo–Se@NC electrode possesses greatly enhanced structural integrity and accelerated ion/electron transfer kinetics. When employed as a binder- and additive-free anode for SIBs, the FeCo–Se@NC electrode exhibits a high reversible capacity of 532.1 mA h g−1 at 0.05 A g−1, competitive rate capability (193.3 mA h g−1 at 5 A g−1), and good cycling stability (386.1 mA h g−1 after 150 cycles at 0.5 A g−1). Moreover, when coupled with Na3V2(PO4)3/C, the full cell delivers a high capacity of 350.6 mA h g−1 at 0.1 A g−1 and a high energy density of 276.7 W h kg−1. This work is expected to provide a new avenue for the development of arrayed transition metal selenide-based materials for high-performance SIBs.
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Advanced Electronic Materials
·
2021
·Vol. 7
·期 7
·2000965
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IF 7.295
Zuoliang Wen,Pai Liu,Jingrui Ma,Siqi Jia,Xiangtian Xiao,Shihao Ding,Haodong Tang,Hongcheng Yang,Chaojian Zhang,Xiangwei Qu,Bing Xu,Kai Wang,Kie Leong Teo,Xiao Wei Sun
Colloidal nanoplatelets (NPLs) are an emerging semiconductor nanocrystal in the display community due to their ultranarrow emission linewidth. Herein, an ultrapure green emitting nanocrystal light-emitting diode (LED) based on four-monolayer CdSe/CdS core/crown NPLs is developed. By applying the nonstacked nanoplates, the nonradiative energy transfer in the NPLs film is successfully suppressed. The nonstacked NPL-LEDs with pure green emission of 521.5 nm exhibit a low turn-on voltage of 2.1 V, a maximum luminance of 22 400 cd m −2 , a peak external quantum efficiency (EQE) of 2.16%, which is a sixfold enhancement comparing to the stacked NPL-LED (EQE = 0.34%). This work demonstrates the potential of core/crown NPLs for ultrawide color gamut displays.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Xiaoqiong Feng,Jianmei Li,Yunlong Ma,Chunyan Yang,Shiying Zhang,Jinfeng Li,Changsheng An
Owing to their low cost and abundant reserves, aluminum-ion batteries (AIBs) have been considered a potential candidate for future large-scale storage applications. However, AIBs are still in the stage of intensive research due to their cathodes of limited specific capacity, energy density, and cycling stability. In this work, interlayer-expanded MoSe2/nitrogen-doped graphene (MoSe2/N-G) heterojunctions with fewer layers and fine dispersion are synthesized by a facile hydrothermal method. Experimental verification and theoretical calculation reveal that the unique heterojunction structure and hetero-element doped graphene conductive network are beneficial for improving the electrochemical reaction kinetics and provide more active vacancies for AIBs, as well as slow the structural degradation during the discharge/charge process. When serving as a cathode material for AIBs, the as-prepared MoSe2/N-G electrode presents a high specific capacity of 167 mAh g–1 at 0.2 A g–1. Meanwhile, the hybrid also exhibits excellent cycling stability (140 mAh g–1 at 0.2 A g–1 after 1000 cycles) with a high Coulombic efficiency of 99.54% and less than 16% loss of discharge capacity. As verified by ex situ X-ray photoelectron spectroscopy (XPS)/transmission electron microscopy (TEM) characterization and first-principles calculations, the Al3+ intercalation mechanism of the MoSe2/N-G electrode in AIBs are further confirmed.
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Small
·
2020
·Vol. 16
·期 45
·2005039
·
IF 11.459
Shiyi Zuo,Bingjun Sun,Yinxian Yang,Shuang Zhou,Yu Zhang,Mengran Guo,Mengchi Sun,Cong Luo,Zhonggui He,Jin Sun
The current state of chemotherapy is far from satisfaction, restricted by the inefficient drug delivery and the off-target toxicity. Prodrug nanoassemblies are emerging as efficient platforms for chemotherapy. Herein, three docetaxel dimeric prodrugs are designed using diselenide bond, disulfide bond, or dicarbide bond as linkages. Interestingly, diselenide bond-bridged dimeric prodrug can self-assemble into stable nanoparticles with impressive high drug loading (≈70%, w/w). Compared with disulfide bond and dicarbide bond, diselenide bond greatly facilitates the self-assembly of dimeric prodrug, and then improves the colloidal stability, blood circulation time, and antitumor efficacy of prodrug nanoassemblies. Furthermore, the redox-sensitive diselenide bond can specifically respond to the overexpressed reactive oxygen species and glutathione in tumor cells, leading to tumor-specific drug release. Therefore, diselenide bond bridged prodrug nanoassemblies exhibit discriminating cytotoxicity between tumor cells and normal cells, significantly alleviating the systemic toxicity of docetaxel. The present work gains in-depth insight into the impact of diselenide bond on the dimeric prodrug nanoassemblies, and provides promising strategies for the rational design of the high efficiency–low toxicity chemotherapeutical nanomedicines.
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Catalysts
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2021
·Vol. 11
·期 2
·169
·
IF 4.146
Yan Tan,Yijun Yin,Xianhong Yin,Chenghao Lan,Yu Wang,Feilong Hu,Qin Huang,Yan Mi
The pursuit of low-cost and high-efficiency catalyst is imperative for the development and utilization of hydrogen energy. Heteroatomic doping which is conducive to the redistribution of electric density is one of the promising strategies to improve catalytic activity. Herein, the Se-doped CoS2porous nanowires array with a superaerophobic surface was constructed on carbon fiber. Due to the electronic modulation and the unique superaerophobic structure, it showed improved hydrogen evolution activity and stability in urea-containing electrolyte. At a current density of 10 mA cm−2, the overpotentials are 188 mV for hydrogen evolution reaction (HER) and 1.46 V for urea oxidation reaction (UOR). When it was set as a cell, the voltage is low as 1.44 V. Meanwhile, the current densities of HER and UOR, as well as of cell remained basically unchanged after a continuous operation for 48 h. This work opens up a new idea for designing of cost-saving hydrogen evolution electrocatalysts.Keywords:superaerophobic;cost-saving hydrogen evolution;heteroatom doping;electronic adjustment
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CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 21
·6538-6544
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IF 5.236
Yi Huang,Le Gao,HaoHai Yu,Zhihua Yang,Junjie Li,Shilie Pan
Graphical Laser damage limitation : Promising ternary infrared nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), with unique [NaQ 4 ] NLO-active groups, are successfully prepared. Theoretical calculations and statistical analyses indicate that the second-harmonic generation effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length. Four sodium-based ternary IR nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), were prepared through a high-temperature flux method. The crystal structure of the compounds is built up of isolated [MQ 4 ] tetrahedra and a 3D framework formed by the NaQ n ( n =4, 5) units. The two selenides, Na 6 MSe 4 (M=Zn, Cd), as promising IR NLO materials, show moderate second-harmonic generation (SHG) responses (0.9 and 0.5×AgGaS 2 ) with good phase-matching behavior, as well as high laser damage thresholds (2 and 1.9×AgGaS 2 ). The two sulfides, Na 6 MS 4 (M=Zn, Cd), exhibit higher laser damage thresholds (13 and 4×AgGaS 2 ), but smaller SHG responses (0.3 and 0.2×AgGaS 2 ). Theoretical calculations and statistical analyses indicate that the SHG effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length, which provides a new insight into the design of novel IR NLO materials.
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Journal of Materials Chemistry A
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2020
·Vol. 9
·期 4
·2292-2300
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IF 11.301
Yafang Qi,Xiaoyue Zhao,Yao Liu,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yuena Meng,Sixin Wu
In Cu2ZnSn(S,Se)4 photovoltaic devices, the exceptionally high density of 2CuZn + SnZn donor defects may induce bandgap fluctuations and thus limit Voc and PCE enhancement. We have previously reported that the partial substitution of Ag for Cu in Cu2ZnSn(S,Se)4 provides a promising way to effectively suppress CuZn defects and considerably enhance the cell performance for Cu2ZnSn(S,Se)4 photovoltaic devices. However, the bandgap fluctuations and detrimental band tailing fundamentally still limit cell performance. On the basis of a Ag-substituted CZTSSe system, in this paper, we demonstrate that partially substituting Zn with Mn could be a feasible tactic to pronouncedly decrease the bandgap fluctuations and prevent detrimental band tailing. Our in-depth investigation reveals that Mn substitution could increase depletion width, decrease the defect densities of the CuZn acceptor and 2CuZn + SnZn donor, and enable grain boundary (GB) inversion in a (Cu,Ag)2ZnSn(S,Se)4-based cell. As a result, an impressive PCE of 11.81% was achieved when the Mn substitution level was 10%, with a Voc of 478 mV, a Jsc of 37.89 mA cm−2, and an FF of 65.23%. This is so far the highest efficiency among Mn-substituted CZTSSe-based photovoltaic devices. By thoroughly understanding these photoelectric properties of the CZTSSe-based photovoltaic devices, we believe that the breakthrough in device efficiency will come soon through our continuous efforts.
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Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 1
·413-422
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IF 11.301
Xiaohuan Chang,Junjie Fu,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
The introduction of alkali metal (AM) post-deposition treatment (PDT) has led to the consecutive breakthrough of world record efficiencies for Cu(In,Ga)Se2 photovoltaics. However, for the derivative Cu2SnZn(S,Se)4 (CZTSSe) solar cells, the corresponding verdict seems partially unjustified due to the difference in defect chemical environment and phase structure, and the most effective incorporation means of AMs is still a mystery. In this work, for the first time, we developed a dual AM synergistic incorporation strategy combining light and heavy AMs by post-depositing CsF after NaF-PDT to improve the efficiency of CZTSSe solar cells. The relevant microscopic-electrical advantages with regard to the different roles of NaF and CsF PDT are discussed in more detail. It was found that the Na atoms are randomly dispersed both in the grain interior (GI) and grain boundaries (GBs), significantly increasing the acceptor concentration and passivating the deep level defects to enhance the Voc. In contrast, the Cs atoms are mainly segregated at the GBs, primarily increasing the potential of the GBs and improving the FF. The prominent electric benefits of Cs at the GBs and Na in the GI finally increase the device efficiency from 10.12% to 12.16%. Our findings solve the difficulty in obtaining the available Voc and FF for future high efficiency research and should serve as a basis for the in-depth understanding of AM-PDT in kesterite photovoltaics.
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ACS Applied Energy Materials
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2021
·
IF 6.024
Ning-Ning Zhou,Ze-Qing Hu,Ramzi Nasser,Ji-Ming Song
High thermoelectric performance and low material cost are essential to the commercialization of thermoelectric modules. Microstructural design, size effects, and rational band engineering are among the keys to high thermoelectric performance, especially for nanocomposites. Here, we demonstrate a facile and versatile bottom-up approach to produce nanocomposites by heat consolidating solution-processed PbSe nanoparticles with a proper amount of Ag. In this PbSe-Ag system, a certain amount of Ag diffuses into the PbSe matrix and partially substituted Pb while other forms Ag2Se at the interphases. This increased the electrical conductivity and inversed the n-type behavior of PbSe to p-type, which is observed from the positive Seebeck coefficient for PbSe-Ag nanocomposites over the temperature range. Nonetheless, the decrease of total lattice thermal conductivity at high temperature is ascribed to the effective phonon at grain boundaries, Ag2Se nanodomain, and point defect. Overall, we obtained an optimized figure of merit, ZT = 0.97 at 723 K for 5 wt % Ag, a significant improvement of 8.8 times than the pure PbSe. Thus, this partially substituting host atom and the presence of a secondary phase provide another potential strategy to enhance the thermoelectric performance of PbSe, promoting its commercialization.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 13
·2008591
·
IF 18.808
Lile Dong,Lining Sun,Wenjuan Li,Yunping Jiang,Yingying Zhan,Luodan Yu,Yu Chen,Guobin Hong
Transition metal selenide nanodots (NDs) represent distinctive antitumor agents for cancer treatment, but their non-biodegradability may bring serious adverse effects and potential long-term toxicity to internal tissues/organs, which substantially hinder their further clinical translations. In this work, the construction of a multifunctional theranostic nanosystem based on degradable and excretable ultrasmall Rh 3 Se 8 NDs by a general bovine serum albumin-templated strategy is reported. The constructed Rh 3 Se 8 NDs exhibit distinctively high photothermal-conversion efficiency (57.5%) in the second near-infrared biowindow, making them highly applicable for photoacoustic imaging and photonic hyperthermia at the desired wavelength. Rh 3 Se 8 NDs exhibit a high tumor growth inhibition rate (98.1%) on 4T1 breast tumor-bearing mice due to the desirable photonic hyperthermia performances. Especially, the fabricated Rh 3 Se 8 NDs feature the large X-ray attenuation coefficients of the Rh component for contrast-enhanced X-ray computed tomography imaging. Importantly, the prominent biodegradability of Rh 3 Se 8 NDs enables their quick excretion out of the body for potentially avoiding inflammation and mitigating long-term toxicity. Therefore, this work highlights the construction of proof-of-concept biodegradable and excretable ultrasmall inorganic theranostic nanosystems for multiple bioimaging-guided cancer nanotherapeutics, guaranteeing the further clinical translations of inorganic nanoparticles in biomedicine.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Changlin Li,Shangrong Chen,Xiangxiang Gao,Wei Zhang,Yanfang Wang
The photoelectrochemical (PEC) performance of ZnO is restricted by its low light absorption ability and high recombination rate of photogenerated carriers. In order to overcome these drawbacks, ZnO/CdS/CdSe heterostructures are prepared on Zn foil substrate using facile three-step methods containing hydrothermal growth, successive ionic layer adsorption reaction (SILAR) and modified chemical bath deposition (CBD). The effects of process parameters containing the number of SILAR cycles of CdS, sensitization sequence of CdS and CdSe, and precursors of CdSe on PEC performance of ZnO/CdS/CdSe heterostructures, and ZnO NRAs on PEC performance of CdS/CdSe co-sensitizer have been scrutinized. Through CdS and CdSe co-sensitization, a layer of CdS/CdSe nanofilm is conformally deposited on ZnO nanorod arrays (NRAs) observed by transmission electron microscopy (TEM). Both the visible-light absorption ability and separation efficiency of photogenerated carriers of ZnO NRAs are significantly enhanced evidenced by UV–vis diffuse reflectance absorption spectra , photoluminescence (PL) spectra and electrochemical impedance spectra. Due to the synergistic effect of ZnO NRAs and CdS/CdSe co-sensitizer, the ZnO/CdS/CdSe heterostructures with five SILAR cycles and one modified CBD cycle (ZnO-CdS5-CdSe) show efficient PEC properties with photocurrent density of 6.244 mA/cm 2 at −0.2 V vs Ag/AgCl under light illumination of 100 mW/cm 2 , which are 57.28 and 4.73 times higher than those of pristine ZnO NRAs and CdS/CdSe clusters, respectively. Moreover, the photoconversion efficiency and incident photon to current conversion efficiency (IPCE) of the ZnO-CdS5-CdSe photoanode reach 4.381% and 80.92%, respectively. The heterostructures based on Zn foil substrate in this study can be a promising candidate for practical PEC application and other applications such as photocatalytic degradation and solar cell due to its low manufacturing cost, large-scale production and efficient PEC ability.
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Nano Research
·
2020
·Vol. 14
·期 8
·2574-2583
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IF 8.183
Zhao Xiaojuan,Wan Houzhao,Liang Pei,Wang Nengze,Wang Cong,Gan Yi,Chen Xu,Tan Qiuyang,Liu Xiang,Zhang Jun,Wang Yi,Wang Hanbin,Wang Hao
High-rate battery-type cathode materials have attracted wide attention for advanced battery-supercapacitor hybrid (BSH) devices. Herein, a core-shell structure of the hollow mesoporous carbon spheres (HMCS) supported NiSe 2 nanosheets (HMCS/NiSe 2 ) is constructed through two-step reactions. The HMCS/NiSe 2 shows a max specific capacity of 1,153.5 C·g −1 at the current density of 1 A·g −1 , and can remain at 774.5 C·g −1 even at 40 A·g −1 (the retention rate as high as 67.1%) and then the HMCS/NiSe 2 electrode can keep 80.5% specific capacity after 5,000 cycles at a current density of 10 A·g −1 . Moreover, the density functional theory (DFT) calculation confirmed that the introduction HMCS into NiSe 2 made adsorption/desorption of OH − easier, which can achieve higher rate capability. The HMCS/NiSe 2 //6 M KOH//HMCS hybrid device has energy density of 47.15 Wh·kg −1 and power density of 801.8 W·kg −1 . This work provides a feasible electrode material with a high rate and its preparation method for high energy density and power density energy storage devices.
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