Solar RRL
·
2021
·Vol. 5
·期 8
·2100216
·
IF 8.582
Bin Xu,Xiatong Qin,Xiaoshuang Lu,Yulin Liu,Ye Chen,Hui Peng,Pingxiong Yang,Junhao Chu,Lin Sun
Cu 2 ZnSn(S,Se) 4 has been widely regarded as a promising thin-film solar cell material. In recent years, the development of Cu 2 ZnSn(S,Se) 4 solar cells has encountered a bottleneck, and the higher open-circuit voltage deficit mainly caused by the secondary phase, CZTSSe/CdS interface recombination, deep-level defects, and band-tailing effects has been an outstanding issue. Herein, the influence of the composition and phase distribution of the precursor thin film on the defect and performance of Cu 2 ZnSn(S,Se) 4 solar cells is studied. By modifying the distribution of composition and phase for precursor films, a Cu 2 ZnSn(S,Se) 4 absorber layer without secondary phase and with fewer detrimental defects can be obtained from the pure-phase precursor film. Thanks to the reduction of the band-tailing effects, the increase in the depletion width for heterojunction, and the decrease in CZTSSe/CdS interface recombination, the photovoltaic performance of CZTSSe thin-film solar cells is significantly improved. Finally, based on the excellent kesterite absorber layer, a Cu 2 ZnSn(S,Se) 4 solar cell with 11.51% power conversion efficiency (the active area efficiency is 12.4%) is prepared.
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SOLAR ENERGY
·
2021
·
IF 5.742
Junye Tong,Shaotong Wang,Gang Wang,Yue Liu,Yuxiang Wang,Liping Chen,Lingling Wang,Daocheng Pan,Xintong Zhang,Yichun Liu
Ion doping strategy is a promising method to enhance the efficiency of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells, however, most of the reported works focus on studying the single ion doping in CZTSSe absorber layers . Here, Li + &Ag + and Li + &Cd 2+ double-ion-doping strategy are applied to improve the microstructure and device performances. We found that the double-ion-doping strategy can obviously increase the grain size, reduce the thickness of fine-grain layers and enhance the device performances. Furthermore, the PCEs of Li + &Ag + and Li + &Cd 2+ doped CZTSSe solar cells are up to 8.87% and 8.39%, respectively. It shows an encouraging improvement of over 43.5% and 35.8% enhancement compared with the traditional method (6.18%), and significantly higher than single ion doping strategy (7.60%, 7.99% and 7.11% for Li + , Ag + , and Cd 2+ doped CZTSSe solar cells). This work provides a new solution to improve the microstructure and device performances of CZTSSe solar cells.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Deng,Cheng Ye,Anhong Cai,Linyi Huai,Shiqing Zhou,Feilong Dong,Xueyan Li,Xiaoyan Ma
As a typical iron-based oxide semiconductor with abundant reserves, α-Fe 2 O 3 has been widely used in the domain of photocatalysis and environmental remediation. Here, sulfur doped α-Fe 2 O 3 (S-α-Fe 2 O 3 ) has been successfully fabricated through coprecipitation, hydrothermal and calcination processes and applied to activate persulfate (PS) for carbamazepine (CBZ) degradation under UV irradiation. Systematic characterizations were conducted to analyze the morphology, structure and chemical composite of S-α-Fe 2 O 3 . UV/PS/S-α-Fe 2 O 3 process showed remarkably enhanced photocatalytic performance for CBZ degradation. The degradation rate constant (7.78 × 10 −2 min −1 ) was about 2.2 and 14.1 times as high as that of UV/PS/α-Fe 2 O 3 (3.60 × 10 −2 min −1 ) and UV/PS (5.53 × 10 −3 min −1 ) processes, respectively. With increasing PS concentration and photocatalyst dosage, the removal efficiency of CBZ both increased. UV/PS/S-α-Fe 2 O 3 process can efficiently and steadily operate in a wide pH range of 3.0–8.0. The introduction of water matrix species (i.e. chloride, bicarbonate, nitrate and humic acid) exerted different effects on CBZ degradation. S-dopant was doped via forming ≡Fe III -SO 4 2- bond on S-α-Fe 2 O 3 surface, and doped sulfur functioned as surface electrons trapping centers derived from DFT study. The band gap value of S-α-Fe 2 O 3 was reduced and the separation efficiency of photogenerated electrons and holes was improved. Hydroxyl radicals, sulfate radicals, superoxide radicals and holes all contributed to CBZ destruction. Furthermore, two major routes of CBZ degradation were proposed as hydroxylation and deamination, then followed by decarbonxylation, ketonization and ring cleavage based on the results of HPLC-MS and DFT calculation.
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Materials Today Energy
·
2021
·
IF 7.311
S. Zhai,Y. Luo,Z. Fan,M. Zhou,K. Hou,H. Zhao,M. Hu,Y. Xiao,K. Jin,Y. Zhao,X. Li,Z. Cai
A new strategy has been designed for enhancing the electrochemical performances of the supercapacitor and water-splitting electrodes. Hetero-structure composite electrode based on copper sulfide (CuS), zinc oxide (ZnO), and porous carbonized cotton (PCc) is prepared via vacuum thermal evaporation technology and successive ionic layer adsorption methods. Porous substrate provides plenty of active sites, which facilitates the exchange of ions/charges in the electrode processes. The composite electrode exhibits outstanding electrochemical energy storage and electrocatalytic performances. The symmetrical supercapacitor as assembled reaches a high energy density of 0.27 Wh cm −2 at the power density of 3.34 W cm −2 . By optimizing the composite structure, the energy barriers of the CuS/ZnO/PCc compound are reduced obviously in oxygen evolution reaction in comparison with pure PCc or CuS/PCc. The overpotential of the sample is decreased to 337 mV (10 mA cm −2 of the loop current) compared to that of PCc (492 mV) and CuS/PCc (415 mV). This work may inspire the rational design of composite electrode materials to achieve high performance in cross-field applications.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2021
·
IF 3.205
Yuan Zhou,Mengying Wei,Meiling Fan,Zhongying Liu,Aimin Wang,Yuanyuan Liu,Lihui Men,Zifeng Pi,Zhiqiang Liu,Fengrui Song
Lignans from Schisandra chinensis (Turcz.) Baill (LFS) has been proved to improve impaired cognitive ability thereby show potential in treating Alzheimer’s disease (AD). In this study, UHPLC-Q-TOF-MS and UHPLC-QQQ-MS were adopted cooperatively to establish a method synchronously detecting 10 kinds of LFS monomers in rat plasma samples. And this method was further applied for pharmacokinetic study to compare the metabolism of LFS in normal and AD rats. The results indicated that AD rats showed an observably better absorption of LFS compared to normal rats. Based on time-varying plasma concentration of LFS, metabolomics was used to establish a plasma concentration–time-endogenous metabolite connection. In total 54 time-varying endogenous metabolites were screened and most of which were closely associated with AD. And LFS exerted a concentration dependent regulating effect to most of these metabolites. Through biomarker related pathways and biological function analysis, LFS might treat AD through neuroprotection, antioxidant damage and regulating the metabolism of unsaturated fatty acids. This is the first study connecting LFS absorbtion and endogenous metabolite changes with the time lapse. The pharmacokinetics and metabolic profile differences between normal and AD rats were firstly investigated as well. This study provides a novel perspective in exploring the effect and mechanism of LFS in treating AD.
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CHEMOSPHERE
·
2020
·
IF 5.778
Shaohua She,Yifan Wang,Rong Chen,Futao Yi,Chuanzhi Sun,Jiayue Hu,Zhi Li,Gang Lu,Mingshan Zhu
The wide use and distribution of sulpiride (SP) has caused potential threats to the water environment and human health. In this study, ultrathin S-doped graphitic carbon nitride nanosheets (US–CN) was successfully synthesized and characterized, and its SP removal efficiency was evaluated under various conditions via the visible-light-assisted peroxydisulfate (PDS) activation method. The degradation pathways and mechanism were also discussed through quenching experiments, density functional theory (DFT) calculations, and intermediate products detection. After sulfur doping and ultrasonic treatment , graphitic carbon nitride (CN) possessed an ultra-thin and porous structure, which facilitated the electronic distribution and more photocurrent , thus resulting in the excellent stability and removal efficiency for SP via PDS activation upon visible light irradiation. The singlet oxygen ( 1 O 2 ) generated by the US-CN/PDS/VL system played a significant role in SP degradation. Based on the bonds of electron-rich atoms fracturing and the SO 2 extrusion, the SP degradation pathway was proposed. This work provides a useful information for the SP photocatalytic degradation via PDS activation.
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Nanoscale
·
2020
·Vol. 12
·期 47
·24196-24205
·
IF 6.895
Heng Zhang,Peigen Zhang,Long Pan,Wei He,Qi Qi,Zhuoheng Bao,Li Yang,Wei Zhang,Michel W. Barsoum,ZhengMing Sun
Lithium–sulfur (Li–S) batteries are regarded as potential next-generation energy storage systems due to their high theoretical energy densities. However, the dissolution of lithium polysulfides (LiPSs) upon cycling can result in severe capacity degradation. Achieving high rate capabilities with good cycling stability remains a huge obstacle for the practical implementation of Li–S batteries. Here we developed a novel, multifunctional, hierarchical structure by self-assembling core–shell MnO2 nanorods @ hollow porous carbon with 2D Ti3C2Tx nanosheets, labelled as MCT, as an efficient polysulfide mediator for Li–S cathodes. The integration of the polar MnO2 core and hollow porous carbon shell captures LiPSs two ways: physical confinement and chemisorption. The conductive Ti3C2Tx nanosheets construct a continuous and conductive network, which not only promotes charge transfer and ion diffusion but also boosts LiPS adsorption and conversion. Based on these merits, the MCT/S cathode delivers good rate capability (688 mA h g−1 at 2.0C) and outstanding long-term cyclability (0.044% capacity decay per cycle over 600 cycles at 2.0C).
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Nanoscale
·
2020
·Vol. 12
·期 42
·21770-21779
·
IF 6.895
Bohan An,Jiacheng Li,Xiaochao Wu,Wanqing Li,Yongliang Li,Lingna Sun,Hongwei Mi,Qianling Zhang,Chuanxin He,Xiangzhong Ren
To improve the high reversibility of lithium–air batteries, an air electrode needs to have excellent electrochemical performance and spatial structure. Ni3S2 nanoparticles are loaded onto an N,S-doped pearl chain tube (N,S-PCT) by a method called quasi-chemical vapor deposition (Q-CVD). Additionally, N and S are doped during the synthesis process, thereby forming an ideal pipe rack-like structure. The large amount of space in the tube rack can provide sufficient storage to act as a buffer for the discharge products, and the interconnected tubes can effectively promote the dispersion of O2 and electrolyte. The addition of Ni3S2 nanoparticles effectively reduces the charge transfer resistance, thereby increasing the electron mobility of the cathode. Ni3S2@N,S-PCT cathodes effectively improve the cycling and high-rate performance of lithium–air batteries, demonstrating an ultrahigh discharge capacity of 16 733.7 mA h g−1 at a current density of 400 mA g−1 and an ultrahigh discharge capacity of 5088.1 mA h g−1 at a current density of 1000 mA g−1. When the cut-off capacity is 1000 mA h g−1, the battery with the Ni3S2@N,S-PCT-800 electrode can achieve cycling stability for 148 cycles. This research provides a new solution for the design of lithium–air batteries with high electrocatalytic performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiaoyun Chen,Huizhi Sun,Dong-Hau Kuo,Adugna Boke Abdeta,Osman Ahmed Zelekew,Yuanbo Guo,Jubin Zhang,Zhanhui Yuan,Jinguo Lin
Photocatalytic H 2 O splitting by sulfide-based materials is a great challenge, because of the poor resilience of such materials against hole oxidation. Although sulfide ion of catalyst negatively shifts the valence band-edge relative to its oxide ion, the instability of sulfide ions during H 2 O oxidation is a critical obstacle to simultaneous evolution of H 2 and O 2 . Here, active, stable, and spherical nanoflower-like bimetal (Mo,Ni)(S,O) 3- x sulfo-oxide catalysts with a band gap of ∼2.1 eV and different concentrations of oxygen vacancy defects were synthesized for H 2 O splitting. (Mo,Ni)(S,O) 3- x of 25 mg with a suitable amount of oxygen vacancy defects could evolve 587.5 μmol/h H 2 under visible-light irradiation. This work demonstrated an example of converting an oxidation photocatalyst into a reduction one. Microstructure analysis showed that surface oxygen vacancy defects and the multiple-valence charges in Ni and Mo not only promoted effective separation, interface transfer, and reactions of photo-carriers but also reduced the charge build-up to avoid photo-corrosion during photocatalytic water decomposition.
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-17
·
IF 16.419
Peng Yusi,Lin Chenglong,Long Li,Masaki Tanemura,Tang Mao,Yang Lili,Liu Jianjun,Huang Zhengren,Li Zhiyuan,Luo Xiaoying,Lombardi John R.,Yang Yong
Nb 2 C and Ta 2 C MXenes exhibit remarkable SERS performance with the enhancement factors of 3.0 × 10 6 and 1.4 × 10 6 , which is synergistically enabled by the PICT resonance enhancement and electromagnetic enhancement.
The excellent SERS sensitivity endows Ta 2 C MXene with the capability to sensitively detect and accurately identify the SARS-CoV-2 spike protein, which is beneficial to achieve real-time monitoring and early warning of novel coronavirus.
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Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 4
·2292-2300
·
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 HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yingshi Zhu,Fengxia Deng,Shan Qiu,Fang Ma,Yanshi Zheng,Ruqian Lian
Facing low reactivity/selectivity of oxygen reduction reaction (ORR) in electro-Fenton (EF), N, S atoms were introduced into carbon-based cathode. “End-on” O 2 adsorption was achieved by adjusting electronic nature via N doping, while *OOH binding capability was tuned by spin density variation via S doping. Results showed the optimized N, S co-doped cathode presented a 42.47% improvement of H 2 O 2 accumulation (7.95 ± 0.02 mg L −1 cm −2 ). According to density functional theory (DFT), N, S co-doped structure favored the “end-on” O 2 adsorption as adsorption energy dropped to − 2.24 eV. Moreover, O-O/C-O bond lengths variation proved a possibility for *OOH desorption. The elaborated cathode was used in EF for sulfonamides (SAs) decay. A 100% removal rate of sulfadiazine (SDZ), sulfathiazole (STZ) and sulfadimethoxine (SDM) was achieved within 60 min, among which SDZ tended to be degraded easily. Because the absolute hardness ( η ) of those pollutants is ranked as follows: η SDM > η STZ > η SDZ . Degradation pathways were proposed based on the detected byproducts, along with toxicity was evaluated by ecological structure-activity relationship (ECOSAR) program. Results showed that toxic intermediates generated were reduced or even disappeared. EF with N, S co-doped cathode provides a promising process for antibiotics wastewater treatment .
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