JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 23
·13243-13258
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IF 4.22
Cao Yi,Tang Peiyuan,Li Shijingmin,Qiu Wenfeng
Abstract Since the previous research confirms the lanthanum titanate (LTO) flexible self-supporting film can be considered as excellent energy storage material, we intend to maximize the performance of LTO to provide higher energy density for practical application. In order to achieve this goal, the Sr element was a choice to substitute with La for increasing the amount of oxygen vacancies in this study, and mechanical flexibility of the film was also maximally preserved. For determining the most appropriate amount of Sr doping, a serious of Sr-doped LTO films marked as LTO- x (0.1 ≤ x ≤ 0.5) were synthesized by electrospinning combined with calcination method. After analyzed by the XRD, SEM, TEM, XPS and electrochemical work station, the LTO-0.3 sample shows the best properties with a maximum capacitance of 1.8 F·cm −2 at 2 mA·cm −2 . As a result of that, we fabricated the flexible all-solid-state supercapacitor device with two LTO-0.3 electrodes and PVA-Na 2 SO 4 gel. This LTO-0.3//LTO-0.3 device exhibits excellent cycling stability, outstanding flexibility and high energy density of 209.4 μWh·cm −2 with the corresponding power density of 2.1 mW·cm −2 . Graphical Abstract
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 16
·4227-4236
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IF 4.157
Chen Li,Liu Donghao,Zheng Limin,Yi Simin,He Hua
In the present work, a structure-dependent ratiometric fluorescence (RF) sensor constructed with boric acid–modified carbon quantum dots (B-CQDs) and Tb-MOF(MOF-76) was developed for sensing 2,6-pyridinedicarboxylic acid (DPA). Based on the distinct fluorescent responses of B-CQDs and MOF-76 to DPA, MOF-76/B-CQDs can be developed as a RF sensor for DPA detection. In this RF sensor, the reticulated cross-linked structure of MOF-76/B-CQDs can be destroyed by DPA due to a strong coordination effect between DPA and the Tb of MOF-76, resulting in the quenching of the fluorescence of B-CQD and the restoration of the fluorescence of MOF-76 after the addition of DPA. Benefiting from the confinement effect of the special structure change, the presented sensor showed high sensitivity toward DPA with a detection limit of 3.05 μM and excellent selectivity over the monochromatic fluorescence sensor. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 10
·13440-13449
·
IF 2.478
Sonu Kyong Su,Kim Pyol,Ko Song Guk,So Hak Son,Ri Jin Hyok,Ryu Kwon Il
Hole conductor-free, fully printable mesoscopic perovskite solar cells with carbon electrode (PM-PSCs) have a good commercialization prospect because of low-cost production and high power conversion efficiency (PCE). Currently, the problem of improving the stability of perovskite solar cells (PSCs) is very important for commercialization. Interfacial engineering using polymers is an effective method to improve the efficiency and stability of PSCs. We prepared PM-PSCs by treatment with the toluene solution containing polystyrene (PS) on the carbon electrode of the PM-PSCs, which would improve the charge transfer and greatly suppressed charge recombination in PS treated PM-PSCs, and also could greatly prevent degradation of perovskite into PbI 2 . The PS treated PM-PSCs showed higher stability to light and moisture than the control, and the PCE was improved from 11.31% (control) to 14.03%.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 3
·1161-1172
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IF 1.371
Cui Mingzhu,Xiang Siyu,Zhang Siyu,Long Ting,Luo Zhenghang,Yang Haijun
In this paper, an amidoximated polyorganophosphazene (PCCP-AO) adsorbent was concizely synthesized via poly(cyclotriphosphazene- co -polyethyleneimine) (PCCP) prepared from hexachlorocyclotriphosphazene (HCCP) and polyethyleneimine (PEI). PCCP and PCCP-AO were characterized by FTIR, SEM, BET and TGA. SEM images showed that both adsorbents had a morphorlogy of microsphere. The influences of pH values, contact times, initial U(VI) concentrations, temperatures and co-existing ions on the U(VI) adsorption properties of PCCP and PCCP-AO were studied. Data showed that PCCP and PCCP-AO exhibited high U(VI) adsorption capacities of 293.2 mg g −1 and 319.1 mg g −1 respectively. PCCP-AO has a higher adsorption capacity, a faster adsorption rate and a better U(VI) selectivity than PCCP. Besides, PCCP-AO exhibited good reusability.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 25
·14222-14233
·
IF 4.22
Zhong Ming,Li Lingling,Zhao Kun,He Fangzhen,Su Bitao,Wang Dahui
Water splitting is considered as one of the recommendable techniques to realize clear and renewable hydrogen production. However, it suffers from lacking efficient and sustainable catalysts. Herein, a metal–organic framework/graphene oxide pyrolysis strategy was proposed to prepare nitrogen-doped porous carbon-stabilized alloys supported on reduced graphene oxide (PdCo@N–C/rGO) composite. When evaluated as an electrocatalyst for hydrogen evolution reaction (HER), the as-obtained PdCo@N–C/rGO shows an excellent performance in acidic media including positive onset potential close to that of commercial Pt/C ( vs . SCE), low overpotential and Tafel slope, as well as long-term durability. Also, it delivers outstanding HER activities in alkaline and neutral conditions. The excellent performance could be mainly ascribed to their synergetic effect among alloy particles, nitrogen-doped porous carbon shell, and conductive rGO substrate. Graphical abstract
A metal-organic framework engineered strategy was proposed to prepare N-doped porous carbon-stabilized PdCo alloys supported on reduced graphene oxide nanocomposite. Specifically, the as-obtained catalyst delivers excellent electrochemical activity for hydrogen evolution reaction.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 3
·565-570
·
IF 1.307
Jian Shaoju,Tian Zhiwei,Zhang Kaiyin,Duan Gaigai,Yang Weisen,Jiang Shaohua
C e/ZnO decorated carbon nanofibers(CNFs) heteroarchitectures(Ce/ZnO/CNFs) have been synthesized using electrospinning technique followed hydrothermal method, which have a high visible light photocatalytic activity. The samples were characterized by means of SEM, FTIR and XRD. The photocatalytic performance of Ce/ZnO/CNFs was tested with the methylene blue in the presence of visible light irradiation. In this work, we have analyzed the effects of Ce doping amount, initial methylene blue(MB) concentration and dosage of Ce/ZnO/CNFs on photocatalytic efficiency of the composite. The results showed that the photocatalyst containing 1.0% Ce in molarity(CZC1) obtained by autoclaving at 150 °C has the best photocatalytic degradation of MB than other as-synthesized samples. Ce/ZnO/CNFs catalysts exhibit a good stability and reusability, which would be an economical and environmentally friendly photocatalyst for various practical applications.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 22
·12803-12813
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IF 4.22
Ali M. R.,Bacchu M. S.,Al-Mamun M. R.,Rahman M. M.,Ahommed M. S.,Aly M. Aly Saad,Khan M. Z. H.
An electrochemical sensor based on molecular imprinted polymer (MIP) to detect ceftizoxime (CFX) with high sensitivity and selectivity is demonstrated. MIP was synthesized by electropolymerization of poly-cysteine (P-Cys) on a multi-walled carbon nanotube (MWCNT) modified glassy carbon electrode (GCE). A targeted drug was used as a template molecule during the polymerization process. The bare GCE was coated with a layer of MWCNT before the synthesis of MIP to improve the sensor sensitivity. Experimental parameters such as polymerization conditions, the influence of pH, molar ratio of the template molecules and the monomer molecules were all optimized. The peak potential exhibited linearity with CFX concentration in the ranges of 1 \(\times 10^{ - 9}\) –1× \(10^{ - 7}\) molL −1 ( R 2 = 0.9904) and 2× \(10^{ - 7}\) –1× \(10^{ - 4}\) molL −1 ( R 2 = 0.9949). The LOD of the MIP sensor was found to be \(1 \times 10^{ - 10}\) molL −1 under optimal conditions using a differential pulse voltammetry (DPV). The proposed sensor was tested on real samples, and good recovery results were obtained.
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GOLD BULLETIN
·
2021
·Vol. 54
·期 1
·59-67
·
IF 1.61
Lin Shijun,Jiang Sirui,Zhang Yuchen,Dai Zhengwei,Dai Yu,Xia Fan,Zhang Xiaojin
Gold nanorod (AuNR) nanocomposite hydrogels have attracted increasing attention due to the photothermal effect of AuNRs. However, a facile strategy that avoids multi-step surface modification for synthesis of AuNR crosslinkers is still a critical challenge. Here, AuNRs crosslinking PNIPAM hydrogels were prepared by polymerization of NIPAM with N , N ′-bis(acryloyl)cystamine (BACA)-modified AuNRs as crosslinkers. BACA contains a disulfide bond in the structure. Dynamic and reversible Au-thiolate bonding was formed by directly mixing AuNRs and BACA to facilely prepare AuNR crosslinkers before hydrogel formation. The addition of AuNRs gives hydrogels their photothermal effect and remarkable mechanical behaviors. Hydrogels could repeatedly adhere to the surface of pigskin, metal, plastic, and glass with a relatively stable adhesion. The damaged hydrogels heal within 2 min with near-infrared (NIR) laser (808 nm, 300 mW∙cm −2 ) irradiation. This work provides a line of thinking for improvement of PNIPAM hydrogels, making them promising for further applications in biomedicine.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2021
·Vol. 30
·期 4
·886-897
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IF 2.757
Yang Chunling,Liu Jin,Ren Qianhong,Liu Yi,Zhou Ping,Li Hua
Biofilm-associated infections and the lack of successful tissue integration of biomaterial surfaces are the two main barriers to the long-term service of implanted biomaterials. Development of novel biocompatible antimicrobial materials has provided insights into their potential biomedical applications. Many clinical studies have successfully proved that hydroxyapatite coating has excellent osteogenic activity but lacks antibacterial infection in the early stages after implantation. Rare earth (Re) elements have become promising antibacterial biocides and bone-forming effects. Antibacterial capacity of 14 rare earth elements (Eu, Gd, Ce, Nd, Y, La, Pr, Er, Sm, Ho, Tb, Yb, Lu, Dy) was assayed. The gadolinium (Gd) showed outstanding broad-spectrum antibacterial activity against both Gram-positive and Gram-positive bacteria. Here, we report Gd-HA coatings deposited on titanium (Ti) substrate by liquid thermal spraying. The grain size of Gd-HA decreased slightly after Gd 3+ incorporation. The antibacterial properties of Gd-HA composite coatings were determined against Gram-negative pathogens Escherichia coli and Gram-positive pathogens Staphylococcus epidermidis . The anti-infection performances were assessed by examining bacteria adhesion and biofilm formation on the coatings. The in vitro cytotoxicity of the Gd-doped HA coatings was further measured on human osteoblast cell line by CCK-8 method. The thermal sprayed HA-Re composite coatings show improved antimicrobial and biocompatible properties and great applicable potential in orthopedics.
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AAPS PHARMSCITECH
·
2021
·Vol. 22
·期 1
·1-9
·
IF 3.246
Sun Xuechun,Zheng Xin,Tang Yan,Debrah Augustine Atta,Du Zhenxia
Biological activity and pharmacological efficacy of protein drugs may be affected by the compatibility between drug and packaging materials. The compatibility of rubber closures seal cap has become the focus of many studies due to its complicated formulation. Despite of the significance of the issue, currently, there is little available data about organic leachables in drugs which is also not comprehensive. Since the concentration of migrants in drug is usually low and the matrix is complicated, the establishment of overall profile of extractables is crucial for the characterization of leachables. Herein, the supercritical fluid extraction (SFE) method was used because of its great extraction capacity and efficiency for low to medium polar extractables in rubber stoppers. The SFE conditions were optimized by response surface methodology (RSM). Experimental results of the extract yield were close to the predicted values ( R 2 = 0.95). Then the extractables were qualitatively and quantitatively analyzed with ultrahigh performance liquid chromatography quadrupole time-of-flight mass spectrometry (UHPLC-QTOF MS). Finally, risk assessment was made by comparing predicted exposure with injection permitted daily exposure (pPDE) limit or threshold recommended by threshold of toxicological concern (TTC). The results showed that there are many extractables such as glyceride, fatty acids and derivatives, antioxidants, and degradation products. Among them degradation products were in the majority and content of 17 substances exceeded corresponding limits. Considering their unknown toxicology, more experiments are therefore needed to provide information on their toxicology and risk assessment. The study provides a reference for the compatibility of drugs, and quality supervision of pharmaceuticals packaging.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 2
·1-9
·
IF 2.584
Ma Rongrong,Pathak Rajesh,Zheng Dongping,Zhang Yingjie,Xing Jie,Liu Junhong,Jiang Yuanyuan,Xiao Mingxing,Wu Fan
In this paper, a ZnO array is first prepared on the conductive glass by hydrothermal method, and then a seed layer of CuO nanoparticles is deposited on the surface of ZnO nanorods to form a core–shell ZnO/CuO nanoarray. Following, the dendritic CuO nanorods are grown on ZnO nanorods by hydrothermal method, constructing a three-dimensional ZnO/CuO nano-heterogeneous hierarchical structure array and applied in photoelectrochemical cell. Our three-dimensional ZnO/CuO nano-heterogeneous hierarchical structure shows obvious absorption of visible light from 500 to 900 nm. The current–time curves reveal that the photocurrent is greatly enhanced after dendritic CuO grows on the ZnO nanorod array. Furthermore, the charge dynamics processes in the core–shell ZnO/CuO nano-heterostructure array and the three-dimensional ZnO/CuO nano-heterostructure array are studied by comparing electrochemical impedance spectroscopy and intensity modulation photocurrent (photovoltage) spectroscopy. Although the photo-generated charge transfer rate in the ZnO/CuO core–shell structure is slightly faster than the three-dimensional ZnO/CuO hierarchical structure, the recombination life of the photo-generated charge is increased by nearly two orders of magnitude in the three-dimensional ZnO/CuO nano-heterostructure array. The three-dimensional ZnO/CuO nano-heterostructure array has a good potential application in the field of photoelectric conversion devices and photocatalysis.
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International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 12
·1711-1722
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IF 1.713
Wang Jun-xiang,Tu Ji-guo,Jiao Han-dong,Zhu Hong-min
Aluminum storage systems with graphite cathode have been greatly promoting the development of state-of-the-art rechargeable aluminum batteries over the last five years; this is due to the ultra-stable cycling, high capacity, and good safety of the systems. This study discussed the change of electrochemical behaviors caused by the structural difference between flake graphite and expandable graphite, the effects of temperature on the electrochemical performance of graphite in low-cost AlCl 3 –NaCl inorganic molten salt, and the reaction mechanisms of aluminum complex ions in both graphite materials by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, cyclic voltammetry, and galvanostatic charge–discharge measurements. It was found that flake graphite stacked with noticeably small and thin graphene nanosheets exhibited high capacity and fairly good rate capability. The battery could achieve a high capacity of ∼219 mA hg −1 over 1200 cycles at a high current density of 5 Ag −1 , with Coulombic efficiency of 94.1%. Moreover, the reaction mechanisms are clarified: For the flake graphite with small and thin graphene nanosheets and high mesopore structures, the reaction mechanism consisted of not only the intercalation of \({\rm{AlCl}}_4^ - \) anions between graphene layers but also the adsorption of \({\rm{AlCl}}_4^ - \) anions within mesopores; however, for the well-stacked and highly parallel layered large-size expandable graphite, the reaction mechanism mainly involved the intercalation of \({\rm{AlCl}}_4^ - \) anions.
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