JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Zhuo Ye,Qingwei Wang,Jiantong Qiao,Baoxian Ye,Gaiping Li
A new voltammetric sensor for simultaneous detection of bisphenol A and bisphenol S with high sensitivity has been constructed based on a three-component composite modified glassy carbon electrode. The three-component composite used herein is composed of AuAgPt ternary alloy nanocrystals (AuAgPt), porous β-cyclodextrin polymer (PCD) and oxide graphene (GO), abbreviated as AuAgPt-PCD-GO. The obtained composites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM). The proposed modified electrode showed excellent electrochemical response to bisphenol A and bisphenol S simultaneously. Under optimal experiment conditions, the response linear ranges for bisphenol A and bisphenol S are from 6 nM to 4000 nM and 8 nM–8000 nM with detection limits of 2 nM and 2.67 nM (S/N = 3), respectively. Furthermore, this electroanalytical sensor could also be successfully applied to real sample analysis with satisfactory results.
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Haoyu Xu,Yuzhou Sun,Zhou Shen,Qing Zhou,Qingyun Zhu,Haifeng Gao,Chao Gao,Xiaoyun Teng,Yu Wei
In this paper, we prepared Na–K co-doped Cu 2 ZnSn(S,Se) 4 (CZTSSe) films by solution method. By optimizing the distribution of the K-doping (uniform or localized K-doping) in the precursor films, the efficiencies of CZTSSe solar cells were improved. The effect of the K-doping distribution on the properties of CZTSSe films and solar cells were investigated. Compared to the solar cells without K-doping, the uniform K-doping in the precursor film increased the solar cell efficiency from 10.4% to 11.7%. In comparison, the localized K-doping in the bottom and in the top of the precursor films yielded solar cells with efficiencies of 12.4% and 10.1%, respectively. It was determined that the K-doping distribution primarily had an influence on carrier recombination in the depletion regions of CZTSSe solar cells. Whereas k-doping at the top of the precursor film greatly enhances the carrier recombination in the depletion region, the bottom doping has the opposite effect. The reason could be that the variation of the K-doping distribution modified the crystallization of the CZTSSe films. As the result, the defect properties of the CZTSSe films were altered. Moreover, the effect of the bottom K-doping on the back contact properties of CZTSSe solar cells was investigated by impedance spectroscopy . Though the K-doping can reduce the back contact barrier of the solar cell, the back contact barrier still achieved the height of 228 meV. The results indicated that the back contact barrier would be an important limiting factor for the efficiency of CZTSSe solar cell.
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高影响因子
RARE METALS
·
2024
·
IF 9.6
Li Jiang,Fang Yu-Chen,Wang Xiao,Ding Ling-Tong,Wang Zhi-Jun,Yang Xin-Yao,Lancok Jan,Li Wei-Min,Zhong Gao-Kuo,Wang Xin,Xing Zheng,Zhao Shen,Liu Shu-De,Long Xia,Ma Ming
Typical p-n junctions have emerged as a promising strategy for contending with charge carrier recombination in solar conversion. However, the photo-corrosion and unsuitable energy band positions still hinder their practical application for hydrogen production from water in photoelectrochemical systems. Here, an in-situ photo-oxidation method is proposed for achieving self-adapting activation of BiVO 4 -based photoanodes with surface-encapsulated CuGaS 2 particles by the ZnO layer. The self-adapting activation demotes the energy band positions of CuGaS 2 , establishing an S-scheme structure with BiVO 4 , resulting in an efficient p-n junction photoanode. The optimal sample exhibits enhanced photocurrent and an onset potential cathodically shifted by ~ 300 mV compared with BiVO 4 , which is attributed to significantly enhanced charge transport and transfer efficiencies. As expected, it attains the highest photocurrent value of 5.87 mA·cm −2 , aided by a hole scavenger at 1.23 V versus a reversible hydrogen electrode, which significantly surpasses that of BiVO 4 (4.32 mA·cm −2 ).
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高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 30
·期 7
·075402
·
IF 3.404
Lulu Chen,Wenxiu Yang,Xiangjian Liu,Ling Long,Dandan Li,Jianbo Jia
The design of high-efficient and durable bi-functional oxygen electrocatalysts is still a great challenge. In this work, novel Co9S8 nanoparticles/N,S-codoped defect-rich carbon nanotubes (Co9S8/N,S-CNTs) were fabricated by an ingenious template method. CdS nanowires, as a sacrificial template, can be removed simultaneously during the carbonization process without additional post-treatments. The large BET surface area (661.2 m2 g−1) and pore volume (1.49 cm3 g−1) of Co9S8/N,S-CNTs could largely enhance the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities by facilitating the mass transportation and exposing more active sites. The abundant defects produced by the evaporation of Cd and S doping could provide more active sites for ORR and OER. Coupling with Co9S8, Co9S8/N,S-CNTs possesses more defects in the carbon skeleton, better electron conductivity, and larger effective electrochemical area. Co9S8/N,S-CNTs not only performs excellent ORR activity with a half-wave potential of 0.821 V but also owns RuO2-like OER activity in alkaline solution. The potential difference (ΔE) between ORR and OER is as low as 0.78 V in 0.10 M KOH. The excellent bi-functional performance enables the potential to be utilized in fuel cells and metal-air batteries.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Ruoxi Ma,Yufeng Kang,Tao Wang,Tao Jiang,Hao-yan Yin,Chao Liu,Haibing Wei,Yunsheng Ding
Anion-conducting poly(arylene alkylene)s are one of the most encouraging anion exchange membrane candidates with high alkaline stability for clean energy power generation . However, optimization of their conductivities often relies on the improvement of ion contents. Herein, a simple design strategy of backbone modification is reported, which can modulate the chain packing behavior and increase the free volume by introducing dimethylfluorenylene (DMeF) units into the poly(terphenylene alkylene) backbone, so as to realize the conductivity improvement of the membrane. The average chain spacing of DMeF-incorporated PTFPA membrane is extended to over 5.1 Å from the original poly(terphenylene alkylene) with the value of 4.2 Å. Accordingly, the membrane properties can be effectively modified by varying the contents of DMeF units, and PFTPA-81 containing 81 mol% of DMeF units particularly demonstrates a combination of high ion conductivity (177 mS cm −1 ), proper water absorption (<90 wt% at 80 °C), and uncompromised alkaline stability (>1000 h in 1 M aq. at 80 °C). Moreover, a H 2 –O 2 fuel cell prototype fabricated from PFTPA-81 achieved a high peak power density of 1.33 W cm −2 , and the cell voltage decreased less than 8% (from 0.75 V to 0.69 V) for an in-situ durability test of 30 h.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Wu,Wenzhong Zhang,Chunping Li,Erdan Hu
The effects of Fe(III) and Cu(II) on the sorption of atrazine (AT) and prometryn (PY) on clay minerals were investigated both preloaded and in solution. For smectite , Fe(III) preloading greatly enhanced AT and PY sorption at pH 4.0 and 6.0 but diminished AT sorption at pH 8.0. Cu(II) preloading promoted AT and PY sorption under alkaline conditions but suppressed AT sorption at pH 4.0. The adverse effects were not obvious for PY. While for illite and kaolinite , Fe(III) and Cu(II) had little or promotion effects due to the lower contents of them in these two minerals. In the co-sorption studies, for smectite, AT sorption remained at pH 4.0 and increased at pH 6.0 and 8.0, while PY sorption was inhabited over the pH range of 4.0–8.0 in the presence of Fe(III). AT and PY sorption were not affected by Cu(II) except for PY at pH 8.0, in which case, the sorption was promoted. For illite and kaolinite , Fe(III) and Cu(II) generally enhanced AT and PY sorption.
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高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 6
·3717-3728
·
IF 4.9
Wang Wenxi,Han Sirui,Ren Junjie,Xiao Xiufeng,Chen Jingbo,You Ruiyun,Zhang Guifeng,Lu Yudong
A two-dimensional (2D) substrate composed of nanocellulose-gold nanostars (S-CNF/Au NSs) was prepared, which exhibited remarkable homogeneity and stability. P-aminothiophenol (PATP) was modified on the S-CNF/Au NSs substrate by Au–S bonds. The amino group of PATP was utilized to react with the aldehyde group of malondialdehyde (MDA) in a Schiff base reaction, resulting in a new Raman peak at 1655 cm −1 attributed to C = N vibration. Since the intensity of the Raman peak at 1078 cm −1 was hardly affected under acidic conditions, the ratio of the characteristic peak of C = N (1655 cm −1 ) to the peak intensity at 1078 cm −1 was used as a characterization of the MDA concentration. The precision of signal intensity was further corrected to improve confidence of the results. The developed SERS sensing system displayed satisfactory sensitivity with a linear detection range of 1 × 10 –9 ~ 2.5 × 10 –2 mM and a limit of detection (LOD) of 1.29 × 10 –11 mM. The S-CNF/Au NSs 2D substrate was able to sensitively differentiate serum from gastric cancer patients and healthy individuals by SERS analysis ( p < 0.0001), which was superior to colorimetric analysis ( p < 0.01). This result suggests that the proposed S-CNF/Au NSs 2D substrate has potential for MDA detection and can be used for early diagnosis of gastric cancer.
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高影响因子
BIOMACROMOLECULES
·
2022
·
IF 6.978
Zhaoyue Li,Yilin Qian,Yihuan Lai,Fu-Sheng Du,Zi-Chen Li
Poly(α-methylene ester)s are an attractive type of functional aliphatic polyesters that represent a platform for the fabrication of various biodegradable and biomedical polymers. Herein, we report the controlled ring-opening polymerization (ROP) of a seven-membered α-methylene lactone (3-methylene-1,5-dioxepan-2-one, MDXO) that was synthesized based on the Baylis–Hillman reaction. The chemoselective ROP of MDXO was catalyzed by diphenyl phosphate (DPP) at 60 °C or stannous octoate (Sn(Oct)2) at 130 °C, generating α-methylene-containing polyester (PMDXO) with a linear structure and easily tunable molar mass. The ring-opening copolymerization of MDXO with ε-caprolactone or 1,5-dioxepan-2-one was also performed under the catalysis of DPP or Sn(Oct)2 to afford copolymers with different compositions and sequence structures that are influenced by the kinds of monomers and catalysts. PMDXO is a slowly crystallizable polymer with a glass transition temperature of ca. −33 °C, and its melting temperature and enthalpy are significantly influenced by the thermal history. The thermal properties of the copolymers are dependent on their composition and sequence structure. Finally, the post-modification of PMDXO based on the thiol-Michael addition reaction was briefly explored using triethylamine as a catalyst. Given the optimized condition, PMDXO could be dually modified to afford biodegradable polyesters with different functionalities.
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DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Lifang Teng,Junye Tong,Gang Wang,Lingling Wang,Liping Chen,Shaotong Wang,Yinglin Wang,Daocheng Pan,Xintong Zhang,Yichun Liu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells have drawn worldwide attention for their promising photovoltaics performance and earth-abundant element composition, yet the record efficiency of this type of device is still far lower than its theoretical conversion efficiency. Undesirable band alignment and severe non-radiative recombination at CZTSSe/CdS heterojunction interfaces are the major causes limiting the current/voltage output and overall device performance. Herein, we propose a novel two-step CdS deposition strategy to improve the quality of CZTSSe/CdS heterojunction interface and thereby improve the performance of CZTSSe solar cell. The two-step strategy includes firstly pre-deposits CdS thin layer on CZTSSe absorber layer by chemical bath deposition (CBD), followed with a mild heat treatment to facilitate element inter-diffusion, and secondly deposits an appropriate thickness of CdS layer by CBD to cover the whole surface of pre-deposited CdS and CZTSSe layers. The solar energy conversion efficiency of CZTSSe solar cells with two-step deposited CdS layer approaches to 8.76% (with an active area of about 0.19 cm 2 ), which shows an encouraging improvement of over 87.98% or 30.16% compared to the devices with traditional CBD-deposited CdS layer without and with the mild annealing process, respectively. The performance enhancement by the two-step CdS deposition is attributed to the formation of more favorable band alignment at CZTSSe/CdS interface as well as the effective decrease in interfacial recombination paths on the basis of material and device characterizations. The two-step CdS deposition strategy is simple but effective, and should have large room to improve the quality of CZTSSe/CdS heterojunction interface and further lift up the conversion efficiency of CZTSSe solar cells.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaofen Dong,Feijiang Chen,Guoguang Chen,Bin Wang,Xiaoli Tian,Xiaolong Yan,Ya-Xia Yin,Chengwei Deng,Duan Wang,Jianfeng Mao,Sailong Xu,Shilin Zhang
Rational design of high-capacity nanosized composites as anode nanomaterials is crucial to boosting electrochemical performances towards large-scale application for lithium- and sodium-ion batteries (LIBs and SIBs). The small sizes and homogeneous dimensional size distributions are achieved typically by either the surface confinement on the underlying supports, or the encapsulation confinement within the precursors (such as metal-organic frameworks). Herein, we report the ultrasmall NiS 2 nanodots on reduced graphene oxide (NiS 2 /N,S-rGO) synthesized via interlayer confinement as anode nanomaterials for LIBs and SIBs . The composite is synthesized by pyrolyzing a host/guest precursor of sodium dodecyl sulfate ion/[NiEDTA] 2− anions co-intercalated MgAl-layered double hydroxide LDH host, without additional sulfur source. The host/guest-derived interlayer nanoconfinement enables the composite to integrate the advantageous features: low-content active NiS 2 nanodots (11.0 wt%) with a mean size of 3.8 ± 0.5 nm, high-content N,S-rGO (89.0 wt%), as well as a large specific surface area and mesopore size distribution. The composite used as anode nanomaterial exhibits reversible capacities of 801.2 mAh g −1 after 100 cycles at 100 mA g −1 for LIBs , and 207.7 mAh g −1 after 200 cycles at 0.1 A g −1 for SIBs , which are greatly higher than those of the pristine N,S-rGO without NiS 2 nanodots. The enhancement is experimentally supported by the low charge transfer resistance, high capacitive-controlled contribution, and good structural stability. Our guest/host-based interlayer nanoconfinement can promise an effective synthesis strategy for designing various nanosized anodes for electrochemical energy storage.
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高影响因子
Magnetic Resonance Letters
·
2021
·
IF 0
Kaleem-Ur-Rahman Naveed,Li Wang,Haojie Yu,Qian Zhang,Wei Xiong,Raja Summe Ullah,Ahsan Nazir,Muhammad Usman,Shah Fahad,Amin Khan,Md Alim Uddin,Di Shen
Study of the segmental mobility of polymer chains is important when the polymer is used as drag reduction agents of crude oil. Electron spin resonance (ESR) spectroscopy can provide important information about segmental dynamics of polymer chains, which is related to their microenvironment. In this article, we employed an amphiphilic polymer to study the effect of hydrophilic/hydrophobic balance of the polymers on the segmental motion of polymer chains. Poly(styrene- co -maleic acid) (PSMA) was spin labeled with 4-amino TEMPO radicals by increasing the concentration of radical moiety on the polymer chains. The PSMA and spin labeled-PSMAs (SL-PSMAs) were characterized by nuclear magnetic resonance (NMR), Fourier transform infrared (FT-IR) spectroscopy, Cyclic voltammetry (CV) and ESR techniques. Inter-polymer complexes (IPCs) of SL-PSMA-2 were prepared by employing polyethylene glycols (PEGs) of varying molecular weights. The results showed that the increased hydrophobic interactions of nitroxide radicals on the SL-PSMAs’ chains reduced the rotational mobility of spin labels and the random coil-to-globular transition of polymer chains occurred at higher pH value for SL-PSMAs, which showed a slow motion component in the ESR spectra of SL-PSMAs. Further, by increasing the molecular weight of PEGs in IPCs the complexation was increased, which also reduced the rotational motion of spin labels due to interpolymer hydrogen bonding causing a slow motion component in the ESR spectra.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Tianliang Song,Huilian Hao,Yue Zhao,Xu Wang,Changwang Li,Wenyao Li
Zinc ion hybrid supercapacitors (Zn-HSCs), combined with the superiorities of supercapacitors and batteries , are regarded to have evolutive potential in devices of energy storage. Herein, the nitrogen and sulfur co-doped graphene/polyaniline nanoarrays (NSG/PANI) have been successfully compounded by in-situ polymerization. The structural characterization shows that the NSG/PANI-50 nanocomposite possess more active sites and vertically arranged PANI nanoarrays on the surface of NSG. The Zn-HSCs devices assembled by the zinc foil as anode, NSG/PANI-x (x = 30, 50, 70) as cathode and ZnSO 4 as electrolyte (NSG/PANI//ZnSO 4 (aq.)//Zn) show extraordinary energy storage properties. The prepared NSG/PANI-50//Zn device exhibits exceptional specific capacitance of 268.4 F g −1 at 0.1 A g −1 (the retention rate is 75.2% as the current density increased 20-times from 0.1 A g −1 to 2 A g −1 ), high energy density (95.4 Wh kg −1 ) and excellent capacitance retention rate of ~ 93% at 5 A g −1 after 10,000 cycles. The diffusion-controlled behavior (72% of the total storage charge at 5 mV s −1 ) suggests that the diffusion-controlled process acts a momentous role in the process of energy storage. The impressive results demonstrate that NSG/PANI nanocomposite could be a potential high-performance electrode material for Zn-ion hybrid energy systems.
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高影响因子
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