MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Qiulian Li,Shizhong Sun,Xinyu Li,Xiang Li,Xiu Liu,Daoyong Zhang,Na Yu,Shurong Wang
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) is emerging as one of the most promising materials owing to its low-cost, non-toxicity, similar electronic properties with Cu 2 (In,Ga)Se 2 (CIGS). However, the current highest power conversion efficiency (PCE) for CZTSSe device is far below the CIGS because of the high open-circuit voltage (V oc ) deficit and low fill factor (FF). Here, we fabricated CZTSSe thin film from 2-methoxyethanol solutions and investigated the effects of different Sn (Sn 2+ vs Sn 4+ ) oxidation states of precursor solution and selenization temperature on the crystal quality of the CZTSSe thin film and device performances. By characterizations and analyses, we found that incomplete redox reaction caused by the off-stoichiometric component in Sn 2+ precursor solution led to the formation of detrimental secondary phases such as SnSe, Cu 2 Se, and SnSe 2 in the CZTSSe thin film. The existence of volatile SnSe could cause the formation of voids and thus affected the FF and V oc . The reaction from Sn 4+ precursor solution to absorber material avoided the formation of SnSe. Ultimately, the Sn 4+ thin film showed better features in terms of improving crystal quality and reducing V oc deficit that limited the efficiency of kesterite CZTSSe thin film solar cells. Besides, we demonstrated that an appropriate selenization temperature could further reduce the number of secondary phases and improve the surface morphology and crystallinity of the CZTSSe thin film. As a result, we obtained CZTSSe thin film solar cells with 8.27% PCE from the Sn 4+ precursor solution under the selenization temperature of 580 °C.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Fengxiang Liu,Shuang Wang,Di Wang,Geng Liu,Yinghe Cui,Dan Liang,Xiaodong Wang,Zhipeng Yong,Zhe Wang
Novel high temperature-proton exchange membranes (HT-PEMs) are prepared based on norbornene-type PBI (NbPBI) and double bond ionic liquids . For comparison, three ionic liquids are selected to prepare NbPBI-PIL membranes. Herein, the ionic liquids are synthesized into poly(ionic liquid)s (PILs) by in-situ free radical polymerization . Simultaneously, the PILs also react with the norbornene monomer of NbPBI to form a cross-linked network. After acid-base doping, the Br − or Cl − of PILs are successfully replaced with H 2 PO 4 − to promote proton transport. Notably, the NbPBI-PIL membranes exhibit high proton conductivity and enhanced phosphoric acid retention, especially the NbPBI-MPIm membrane has a proton conductivity of 0.074 S cm −1 at 170 °C and phosphoric acid retention of 87.2% and 73.8% under 160 °C and 80 °C/40 RH%, respectively. The single-cell with NbPBI-TPAm membrane obtains the highest power density of 385 mW cm −2 at 160 °C and negligible single-cell voltage decay after the 200-h test.
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Yuchen Wang,Yunhong Wei,Boya Wang,Peng Jing,Yin Zhang,Yun Zhang,Qian Wang,Hao Wu
Developing high-energy-density lithium-sulfur batteries (LSBs) heavily depends on the rational design of cathodes in order to address the key challenge on suppressing the notorious polysulfide shuttling, particular in high-sulfur-loading electrodes. Herein, a unique hierarchical porous N-doped carbon nanofiber architecture with in-situ generated iron carbide nanocatalysts (Fe 3 C@PCNFs) is delicately designed by using natural collagen fibers as the precursor matrix and the structure-directing agent, which can be applied as an advanced sulfur host in LSBs. Benefiting from the thermal-induced etching by ferric species combined with ZrO 2 hard-template management, such transformed Fe 3 C@PCNFs framework exhibits enhanced graphitization degree, impressive hierarchical porous architecture, and high specific surface area near 1300 m 2 g −1 . The in-situ embedded polar Fe 3 C nanoparticles are proved to possess excellent chemical adsorption and catalysis effect toward the immobilization-conversion of polysulfides and fast Li 2 S nucleation. Thus, a target cathode (S–Fe 3 C@PCNFs) with >76 wt% sulfur content can deliver outstanding rate capability (632 mAh g −1 at 5C) and superb cycling performance (∼0.067% capacity decay per cycle over 500 cycles). Impressively, when applied with high-areal-loading of 6.3 mg cm −2 , the S–Fe 3 C@PCNFs still exhibits a stable cycling life together with a significant high areal capacity of 5.0 mAh cm −2 , manifesting a promising application in practical LSBs.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10959-10970
·
IF 3.591
Sethupathi Shanmugasundaram,Hairus Abdullah,Noto Susanto Gultom,Hardy Shuwanto,Dong-Hau Kuo
Hydrogen is an inevitable energy source to replace fossil fuels in the future. Herein, we report Ni-doped ZnIn2(O,S)4/In(OH)3 heterojunction composites with different sulfur contents to support green hydrogen gas evolution. A simple one-step hydrothermal preparation process was carried out by simultaneously adding all chemical precursors during the synthesis of composites. The as-prepared composites were carefully characterized by XRD, FE-SEM, TEM, XPS, DRS, TPC, MS, EIS and CV techniques, which confirmed their performance in the hydrogen evolution reaction (HER) under visible-light illumination. With increasing sulfur content, XRD analysis indicated the gradual formation of Ni-doped ZnIn2(O,S)4 co-existing with the In(OH)3 phase. The highest hydrogen evolution rate of 2100 μmol g−1 h−1 under visible-light illumination was achieved in the presence of the Ni-doped ZnIn2(O,S)4/In(OH)3 composite. Its excellent photocatalytic performance is related to the good separation of photocarriers. XPS analysis suggests the formation of positively and negatively charged defects on catalyst surfaces which attract the photogenerated electrons and holes, respectively, thus leading to an extended photocarrier lifetime. Furthermore, the coupling effect with In(OH)3 provides a more positive conduction band (CB) relative to that of the Ni-doped ZnIn2(O,S)4 phase for facile electron transfer. A plausible HER mechanism based on the experimental data is proposed in this work.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaogong Lv,Chengjun Zhu,Yiming Wang,Lei Wang,Jianming Shi
Kesterite Cu 2 Zn 1- x Cd x Sn(S,Se) 4 (CZCTSSe) alloy thin films were fabricated by the water-based solution approach. The influence of Cd doping on the morphology, phase structure, element valence states, optical, electrical, and device performance were comprehensively examined. Cd was clearly alloyed into the Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber layer to form the CZCTSSe compound. By controlling the relative Cd content, band gap values ( E g ) of the CZCTSSe thin films were engineered between 1.10 eV and 1.21 eV. In addition, doping with Cd led to the enhancement of grain growth as well as improvement of the conductivity and photoelectric property of the absorber layer. In particular, the CZCTSSe ( x = 0.4) absorber layer exhibited a pure phase, larger grain size, compact and uniform topography, suitable band gap, Cu-poor and (Cd+Zn)-rich composition, higher conductivity and better photoelectric response. Power conversion efficiency (PCE) is improved from 4.37% of the CZCTSSe ( x = 0.0) device to 5.16% of CZCTSSe ( x = 0.4) device, and the increases of short-circuit current ( J sc ) achieved to 8.94 mA/cm 2 . The encouraging results suggest that doping of Cd is an effective way to improve CZTSSe film properties and promote device efficiency.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhuo-Rui Jiang,Yuxin Li,Deyun Zhang,Yu-Xiao Zhou,Genbao Xu,Changhua Wang,Yeqing Lan,Jing Guo
Arsenite (As(III)) is more toxic and difficult to remove than arsenate (As(V)). In this study, an S-doped Cu-La bimetallic oxide (S-CuLaO) decorated with metal-organic framework (MOF) composite (S-CuLaO@UIO-66) was synthesized and applied for the adsorption of As(III). The maximum adsorption capacity of As(III) by S-CuLaO@UIO-66 was as high as 171 mg/g, which was much higher compared with other MOF compounds reported to date. The UIO-66 support improved the dispersion and reduced the size of the S-CuLaO particles, which increased the number of exposed adsorption reactive sites. Study of the mechanism revealed that the synchronous oxidation and adsorption significantly increased the removal of As(III). O 2 ∙ - was produced by the receiving electron from the dissolved oxygen from Cu(I) in S-CuLaO, which converted As(III) to As(V). Furthermore, the stability and reusability S-CuLaO@UIO-66 (without regeneration) was investigated at a low As(III) concentration (approximately 1000 µg/L) in deionized water and well water. The residual arsenic concentration ranged from 0.8 to 2.8 μg/L in deionized water and 3–58.2 μg/L in well water within 240 min during three cycles. Generally, this study suggests that combining an optimal oxide with a stable MOF is a promising approach for the fabrication of composite adsorbents.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Liyuan Duan,Guoqiang Li,Shuting Zhang,Hongyu Wang,Yongle Zhao,Yongfa Zhang
In this study, graphitized carbon nitride photocatalysts were successfully prepared by using the desulfurized waste liquid extracting salt from coking plants. The NO x removal efficiency of g-C 3 N 4 synthesized using ammonium thiocyanate (NH 4 SCN), ammonium thiosulfate ((NH 4 ) 2 S 2 O 3 ) and ammonium sulfate ((NH 4 ) 2 SO 4 ) with different mass ratios were evaluated. The results showed that due to the addition of (NH 4 ) 2 S 2 O 3 and (NH 4 ) 2 SO 4 a large amount of sulfur-containing gas was released during pyrolysis, which significantly increased the specific surface area and pore volume of the photocatalysts. The release of sulfur-containing gas also resulted in the incorporation of sulfur, and due to this doping process the band gap of the photocatalyst was widened to 2.94 eV, thus enhancing its visible light response. C vacancies were formed in the hepazine ring, which increased the electron density around the N–(C) 3 bridge bond and formed an electron trapping center, thus inhibiting the recombination of charge carriers. The photocatalysts had increased O 2 adsorption capacity and increased number of amino groups on their surface. This facilitated the rapid generation and consumption of reactive oxygen species, inhibited the accumulation of NO 2 on the surface, reduced the production of NO 2 , thus improving the NO x removal efficiency of the photocatalysts. The principle of using “waste for waste control” was achieved, and a new method for nitrogen oxide removal was provided.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Li Liang,Xiaoqin Li,Yiqing Guo,Zhang Lin,Xintai Su,Bo Liu
In this study, the reaction between sulfidated nanoscale zero-valent iron (S-nZVI) and heavy metal cations as well as the role of sulfur were investigated. The results showed the corrosion products of S-nZVI were lepidocrocite ( γ -FeOOH) or/and magnetite (Fe 3 O 4 ), depending on heavy metal species. While the removal of Hg(II), Ag(I), Cu(II), and Pb(II) by S-nZVI was rapid and could achieve over 99% within 5 mins, the removal of Ni(II) and Zn(II) was low in efficiency and unstable. Sulfur was existed as iron sulfides at fresh S-nZVI, but was displaced by the heavy metals and formed the related sulfide compound, or oxidized to S 0 and SO 4 2- . The removal mechanisms are strongly dependent on the solubility product constant (K sp ) of metal sulfides. For Hg(II) and Ag(I), with K sp of corresponding metal sulfides much lower than that of iron sulfide, the removal mechanism is the displacement reaction. For Cu(II) and Pb(II), with K sp of corresponding metal sulfides moderately lower than that of iron sulfide, the removal mechanisms are the displacement reaction and complexation with surface groups of S-nZVI. For Zn(II) and Ni(II), whose K sp of corresponding metal sulfides slightly lower than that of iron sulfide, are mainly removed by complexation with surface groups of S-nZVI.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 13
·期 1
·72
·
IF 3.426
Xin Tong,Zhao Wang,Mei-Ling Zhang,Xiao-Jun Wang,Gang Zhang,Sheng-Ru Long,Jie Yang
A series of novel thermoplastic elastomers based on (poly(decamethylene terephthalamide/decamethylene isophthalamide), PA10T/10I) and poly(ethylene glycol) (PEG) were synthesized via a facile one-pot, efficient and pollution-free method. The thermal analysis demonstrates that the melting points of the resultant elastomers were in the range of 217.1–233.9 °C, and their initial decomposition temperatures were in the range of 385.3–387.5 °C. That is higher than most commercial polyamide-based thermoplastic elastomers. The tensile strength of the resultant elastomers ranges from 21.9 to 41.1 MPa. According to the high-temperature bending test results, the resultant samples still maintain considerably better mechanical properties than commercial products such as Pebax®5533 (Arkema, Paris, France), and these novel thermoplastic elastomers could potentially be applied in high-temperature scenes. The non-isothermal crystallization kinetics of the resultant elastomers and PA10T/10I was investigated by means of Jeziorny and Mo’s methods. Both of them could successfully describe the crystallization behavior of the resultant elastomers. Additionally, the activation energy of non-isothermal crystallization was calculated by the Kissinger method and the Friedman equation. The results indicate that the crystallization rates follow the order of TPAE-2000 > TPAE-1500 > PA10T/10I > TPAE-1000. From the crystallization analysis, the crystallization kinetics and activation energies are deeply affected by the molecular weight of hard segment.Keywords:thermoplastic elastomer;non-isothermal crystallization kinetics;semi-aromatic polyamide
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 4
·2459-2469
·
IF 11.301
Xiaomin Cai,Bei Ye,Jianlong Ding,Ziyun Chi,Liping Sun,Petr Saha,Gengchao Wang
Solid-state polymer electrolytes are expected to fundamentally solve the instability and safety problems of liquid electrolytes for lithium–sulfur batteries. Herein, ionic liquids were introduced on the basis of constructing ester-rich copolymers, and dual Li-ion migration channels were built in an ester-rich copolymer/ionic liquid quasi-solid-state electrolyte (SPE-IL). “Association–disassociation” with the carbonyl groups and rapid ion exchange with the ionic liquids are the two migration modes that synergistically increase the room temperature ionic conductivity of the SPE-IL. In addition, the abundant ester groups provide strong chemisorption on lithium polysulfides and successfully inhibit the sulfur shuttle. More importantly, ionic liquids realize the “soft contact” between the electrode and the electrolyte, which is conducive to the construction of stable interfaces. Together with the GPa-level high modulus brought by vinyl carbonate, the formation of lithium dendrites is inhibited. As a result, the assembled lithium–sulfur battery displayed a high initial discharge capacity of 1106 mA h g−1, good cycling stability (80.2% capacity retention after 300 cycles at 0.1 C) and superior rate performance.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Huan Wu,Yuexin Wei,Yu Zhou,Chunlan Long,Yifan Hong,Yan Fu,Tianxin Zhao,Junke Wang,Yuhao Wu,Shengde Wu,Lianju Shen,Guanghui Wei
Bisphenol S (BPS) is now used as an alternative of bisphenol A (BPA), but has been implicated in male reproductive dysfunction—including diminished sperm number and quality and altered hormonal concentrations. However, the mechanisms of action subserving these effects remains unclear. In the present study, BPS at doses of 50 mg/kg bw and 100 mg/kg bw caused defects in the integrity of the blood-testis barrier (BTB) and apical ectoplasmic specialization (ES), and we also delineated an underlying molecular mechanism of action. BPS induced F-actin and α-tubulin disorganization in seminiferous tubules, which in turn led to the truncation of actin filaments and microtubules. Additionally, BPS was found to perturb the expression of the actin-binding proteins Arp3 and Eps8, which are critical for the organization of the actin filaments. mTORC1 and mTORC2 manifest opposing roles in Sertoli cell junctional function, and we demonstrated that mTORC1/rpS6/Akt/MMP9 signaling was increased and that mTORC2/rictor activity was also attenuated. In summary, we showed that BPS-induced disruption of the BTB and apical ES perturbed normal spermatogenic function that was mediated by mTORC1 and mTORC2. The imbalance in mTORC1 and mTORC2, in turn, altered the expression of actin-binding proteins, resulting in the impairment of F-actin and MT organization, and inhibited the expression of junctional proteins at the BTB and apical ES.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Chao Hu,Zi-Han Wei,Pei-Rong Li,James D. Harwood,Xiang-Yang Li,Xue-Qing Yang
The codling moth, Cydia pomonella (L.), is a quarantine pest of global significance impacting pome fruits and walnuts. It has evolved resistance to many commonly used insecticides including λ-cyhalothrin. Glutathione S-transferases (GSTs) are multifunctional enzymes playing a crucial role in the detoxification of insecticides in insects. However, the role of specific GST gene in λ-cyhalothrin resistance in C. pomonella is unclear. In this study, we identified three sigma-class genes (CpGSTs1, CpGSTs2, and CpGSTs3). These genes were ubiquitously expressed at all developmental stages, and of these, the expression level of CpGSTs2 in the larval stage was significantly higher than in the egg, pupal, and adult stages. Moreover, CpGSTs2 was predominantly expressed in the fat body while lower levels in the cuticle. In addition to exposure of larvae to LD10 of λ-cyhalothrin elevating the expression level of CpGSTs2, mRNA levels of CpGSTs2 in a field population (ZW_R) from northeast China, which has developed moderate level resistance to λ-cyhalothrin, was significantly higher than that of susceptible strains. In vitro inhibition assays demonstrated that λ-cyhalothrin inhibited the conjugating activities of recombinant CpGSTs2, and metabolic assays indicated that λ-cyhalothrin could be depleted by recombinant CpGSTs2. These results bring evidence for the involvement of CpGSTs2 in C. pomonella in resistance to λ-cyhalothrin.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）