JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 5
·3899-3909
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IF 2.22
Tian Chen,Zhou Min,Hua Zhongqiu,Yuan Wenjing,Wu Yi,Tian Xuemin,Song Tao
In the present work, gas sensors based on Cr 2 WO 6 nanoparticles were fabricated by a screen-printing technique, and the sensing properties were characterized with acetone and other typical reducing gases under both dry and humid air backgrounds. Interestingly, it was found that Cr 2 WO 6 sensors showed a p-type conduction characteristic with a highly sensitive response to acetone vapor in a relatively low concentration. In the presence of humidity, resistances of Cr 2 WO 6 sensors were significantly increased; nevertheless, sensor responses were obviously inhibited. In addition, the basic sensing mechanism of Cr 2 WO 6 sensor was also investigated based on oxygen adsorption behavior and catalytic properties of Cr 2 WO 6 surface. According to experimental results, it is proposed that the resistive responses of Cr 2 WO 6 sensor to reducing gases were highly oxygen-dependent, indicating that the surface oxygen adsorption and reaction also played the basic role in the sensing process as that observed in typical n-type MOS sensors. Additionally, sensors also suffered from a high cross-sensitivity to water vapor due to the competition of chemisorption of water and oxygen on the surface of Cr 2 WO 6 .
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Journal of Oceanology and Limnology
·
2020
·Vol. 38
·期 5
·1517-1531
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IF 0.617
Tian Jing,Chen Zhuoyuan,Jing Jiangping,Feng Chang,Sun Mengmeng,Li Weibing
The Cu 2 O/TiO 2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array, but also on the wall of TiO 2 nanotubes. The Cu 2 O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu 2 O/TiO 2 -X photoelectrodes and Cu 2 O/TiO 2 -20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2 , in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
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SURFACE ENGINEERING
·
2020
·
IF 2.433
Zhen He,Di Cao,Yuxin Wang,Li Yin,Muhammad D. Hayat,Harshpreet Singh
A series of Co–P–TiO2 nanocomposite coatings were prepared via pulsed electrodeposition technique. TiO2 nanoparticles were embedded into the coating matrix using TiO2 sol. The phase constituents of nanocomposites were identified using X-ray diffraction. The surface morphology of nanocomposites was obtained through scanning electron microscopy. Wear tests and corrosion tests were conducted to determine the coating performance. Electrochemical characterization was performed by electrochemical impedance spectroscopy analysis. The nanocomposite coatings made via conventional pulse electrodeposition had a relatively ordered surface morphology and enhanced mechanical behaviour, which is associated with the increased strengthening effect of embedded nanoparticles. When applying a pulse reverse current, the Co–P–TiO2 nanocomposite coating had improved corrosion resistance owing to its smooth and uniform surface morphology.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yiyi Liu,Peiman Xu,Zhifeng Ye,Tianlun Cen,Xiaomin Peng,Dingsheng Yuan,Haiyan Wu
Transition metal oxides , as newly earth-abundant and low-cost catalysts, have been regarded as promising materials for electrocatalytic oxygen evolution. However, they are rarely used as an electrocatalyst in hydrogen evolution reaction (HER) due to the poor HER activity. Herein, we present a facile two-step method to synthesize P doped CoMoO 4 /RGO (P-CoMoO 4 /RGO) with different atomic ratios of Co 2+ /Co 3+ through a simple phosphorization strategy by changing the mass of NaH 2 PO 2 . The effective P-doping into CoMoO 4 /RGO can modify the electronic properties and modulate the atomic ratio of Co 2+ /Co 3+ , which promotes the electron transfer and creates more activity sites. Therefore, the optimized P-CoMoO 4 /RGO with a relatively larger atomic ratio of Co 2+ /Co 3+ shows superior HER performances in alkaline media , which affords a current density of 10 mA cm −2 at a small overpotential of 90 mV and a low Tafel slope of 62 mV dec −1 along with having satisfactory long-term stability. This work provides a valuable route to enhance the HER activity of transition metal oxides.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xin-Yu Huang,Zong-Tao Chi,Jian Liu,Dong-Hua Li,Xiao-Jun Sun,Cong Yan,Yu-Chong Wang,Hao Li,Xue-Dong Wang,Wan-Feng Xie
Heterostructured semiconductor materials, combining the collective advantages of individuals and synergistic properties, have spurred great interest as a new paradigm toward detecting of volatile organic compounds recently. Direct use of NiS as a sensing material is impractical because the structure of NiS is unstable, exhibiting an undesirable sensing performance. Herein, we firstly report its incorporation into an ethanol gas sensor with a conventional n -type sensitive material of In 2 O 3 , and the gas sensing performance of the NiS@In 2 O 3 nanocomposites has been significantly enhanced. Nanofiber-like NiS and In 2 O 3 were fabricated via a synergetic approach of electrospinning and calcination processes. The diameters of crystalline NiS and In 2 O 3 are about 150 nm and 120 nm, respectively. Then, the NiS@In 2 O 3 nanocomposites were prepared via re-calcination of as-prepared NiS and In 2 O 3 nanofibers. The results show that the sensor based on NiS@In 2 O 3 exhibits a detecting limit of as low as 5 ppm and a short response time of 8 s at the optimum temperature of 300 ºC, which outstripped that (13 s) of pristine In 2 O 3 and pure NiS sensors (21 s) for the detection of ethanol gas. The remarkable improvement of sensing performance can be attributed to the p - n heterojunction in multi-component phases of NiS and In 2 O 3 .
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MOLECULES
·
2023
·Vol. 28
·期 21
·7396
·
IF 4.6
Huihui Chen,Mei Yang,Yuan Liu,Jun Yue,Guangwen Chen
The design and fabrication of nanomaterials with controllable morphology and size is of critical importance to achieve excellent catalytic performance in heterogeneous catalysis. In this work, cobalt oxide (Co3O4) nanostructures with different morphologies (nanoplates, microflowers, nanorods and nanocubes) were successfully constructed in order to establish the morphology–property–performance relationship of the catalysts. The morphology and structure of the nanostructured Co3O4were characterized by various techniques, and the catalytic performance of the as-prepared nanostructures was studied by monitoring the reduction of p-nitrophenol to p-aminophenol in the presence of excess NaBH4. The catalytic performance was found to be strongly dependent on their morphologies. The experimental results show that the pseudo-first-order reaction rate constants for Co3O4nanostructures with various shapes are, respectively, 1.49 min−1(nanoplates), 1.40 min−1(microflowers), 0.78 min−1(nanorods) and 0.23 min−1(nanocubes). The Co3O4nanoplates exhibited the highest catalytic activity among the four nanostructures, due to their largest specific surface area, relatively high total pore volume, best redox properties and abundance of defect sites. The established correlation between morphology, property and catalytic performance in this work will offer valuable insight into the design and application of nanostructured Co3O4as a potential non-noble metal catalyst for p-nitrophenol reduction.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Ying Jie Liu,Wei Ting Gao,Ai Mei Zhu,Qiu Gen Zhang,Qing Lin Liu
Anion exchange membranes (AEMs) are the core component of anion exchange membrane fuel cells (AEMFCs), among which poly(aryl piperidinium) (PAP) based AEMs have been studied. Herein, we report some scalable di-piperidinium cationic crosslinkers to enhance the mechanical properties , ionic conductivity and alkaline stability of PAP-based AEMs. The results show that the morphology of AEMs can be affected by adjusting the length of crosslinker. PTP-DPC/C6-50% shows a high OH − conductivity (80 °C, 131.2 mS cm −1 ) due to its microphase separation . It also has excellent elongation at break (20.8%) and tensile strength (36.5 MPa). The peak power density of the PTP-DPC/C6-50% based cell can reach 616.2 mW cm −2 under H 2 –O 2 conditions. The crosslinked network formed by long alkyl spacer chains is helpful to improve the alkaline stability of the AEM. After alkaline stability test, the conductivity of the PTP-DPC/C10-50% membrane maintained at 92.2%.
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ANALYST
·
2023
·Vol. 149
·期 4
·1212-1220
·
IF 4.2
Feng Li,Kai-Qi Liu,Wen-Juan Wang,Zhen-Tao Jiang,Fen-Ying Kong,Heng-Ye Li,Zhong-Xia Wang,Wei Wang
A fluorometric method based on boron, bromide-codoped carbon dots (BBCNs) was developed for the first time for the highly selective detection of p-nitroaniline (PNA) in wastewater samples. It should be noted that the introduction of bromine greatly increases the molecular polarizability of the probe, which can regulate the energy level matching between the probe and PNA, resulting in the interaction between BBCNs and PNA. In the presence of PNA, the fluorescence of BBCNs is obviously quenched and accompanied by a red shift of the fluorescence band, which might be attributed to the formation of aggregates caused by the polar adsorption of BBCNs and PNA. It is beneficial for constructing a highly selective sensing platform for PNA determination compared to its isomers (o-nitroaniline and m-nitroaniline) through atomic bromine-mediated polarization of the BBCNs. With the help of this mechanism, an excellent linear range of 0.5–300 μM with a low detection limit of 0.24 μM toward PNA was obtained. This work further confirms that there is a significant relationship between the nature of doping elements and the optical and physicochemical properties of fluorescent materials.
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JOM
·
2023
·Vol. 75
·期 12
·5300-5309
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IF 2.6
Wang Huan,Cheng Zhengzai,Djouonkep Lesly Dasilva Wandji,Lan Chupeng,Wang Linfeng,Cai Shuanpu,Ding Ling,Gauthier Mario
Petroleum-based polyesters are widely used in daily life. However, their reliance on petroleum resources and non-biodegradability have raised concerns. Due to the advantages of being renewable, degradable, and abundant, bio-based polyester is expected to become a breakthrough in replacing petroleum-based polyester. In this study, p -hydroxybenzaldehyde, a bio-based monomer, was used to synthesize a novel diol, 2,2′-(4-((4-ethylphenyl)diazenyl)phenylazanediyl)diethanol (EDPD). The EDPD was then polymerized with 1,4-cyclohexanedimethanol (CHDM) and aliphatic diacids to synthesize a series of aliphatic-aromatic polyesters. Thermal analysis showed that the T g varied from 43°C to 104°C, while the melting point ( T m ) varied from 118°C to 156°C. All the polyesters exhibited high yield strengths (48–79 MPa) and tough values (elongation at break of 240–330%). After 30 weeks of soil incubation, the mass loss of the copolyester could reach 4.3%. The investigation of the eco-toxicity of the copolyesters showed that the survival rate of Eisenia foetida was more than 80%, demonstrating their low toxicity in natural habitats. The copolyesters investigated in this study exhibited good thermal, mechanical, and biodegradability properties. The properties of the copolyesters can be adjusted by varying the length of the carbon chains of the dicarboxylic acid moieties. These bio-based copolyesters could provide an important way to promote carbon neutrality and sustainable development of bio-based plastics.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1058-1063
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IF 3.1
Wang Chenghui,Yu Zhichao,Bai Qinghong,Pan Dingwu,Prior Timothy J.,Tao Zhu,Redshaw Carl,Xiao Xin
T he binding behavior of cucurbit[8]uril(Q[8]) and p -hydroxybenzoic acid(p-HBA) has been investigated using 1 H NMR titration experiments, UV-Vis absorption, isothermal titration calorimetry(ITC), and X-ray crystallography. Results revealed that the Q[8] can accommodate two p -HBA molecules to form a 1:2 host-guest inclusion complex in solution, namely ( p -HBA) 2 @Q[8]. From a poorly scattering crystal, we were able to identify two symmetry unique Q[8] rings, but with different p -HBA fillings. The structure can be represented as Q[8]+1.5 p -HBA, which gives Q[8]@(p-HBA) 2 ·Q[8]@ p -HBA as the structural formula. This supramolecular structure was screened for its ability to capture iodine. The experimental results showed that the adsorption efficiency of the supramolecular organic framework material for iodine capture was 43.8%, with an equilibrium adsorption capacity of 223.3 mg/g.
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Journal of Energy Storage
·
2023
·
IF 9.4
Xing Chen,Haijun Tao,Yinhua Jiang,Shishi Li,Yuxin Liu,Kun Xie,Yuqiao Wang
P-doped S vacancy-rich NiCo 2 S 4 hollow microspheres (P-NiCo 2 S 4-x HMSs) were prepared by hydrothermal, sulfuration, and phosphorization methods. P doping and S vacancy dual defects can be simultaneously obtained during the phosphorization process. The dual defects can modulate the electron structure and create abundant electrochemical sites, boosting electron transfer and reaction kinetics. Theoretical calculations illustrated that the dual defects could reduce the adsorption energy of OH − and Mulliken charges of Ni atoms, in favor of OH − adsorption. The hollow construction can increase the specific surface area, promote ion diffusion, and alleviate the volume variation during charge/discharge processes. The specific capacity and rate capability of the P-NiCo 2 S 4-x HMSs electrode can reach up to 1146.0 C g −1 at 1 A g −1 and 61.8 % at 30 A g −1 , respectively. The P-NiCo 2 S 4-x HMSs electrode exhibited remarkable cycling stability with a 79.5 % capacity retention after 20,000 consecutive charge/discharge cycles. The assembled P-NiCo 2 S 4-x //AC hybrid supercapacitor manifested an infusive energy density of 62.7 Wh kg −1 at 867 W kg −1 .
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Wenjuan Zhang,Xuerui Ma,Yijia Zhang,Wanjing Tong,Xing Zhang,Yong Liang,Maoyong Song
Bisphenol P (BPP), structurally similar to bisphenol A, is commonly identified in the samples of environment, food, and humans. Unfortunately, very little information is currently available on adverse effects of BPP. The obesogenic effects and underlying mechanisms of BPP on mice were investigated in this study. Compared with the control, high-resolution microcomputed tomography (micro-CT) scans displayed that the visceral fat volume of mice was significantly increased at a dose of 5 mg/kg/day after BPP exposure for 14 days, whereas the subcutaneous fat volume remained unchanged. Nontargeted metabolomic analysis revealed that BPP significantly perturbed the metabolic pathways of mouse livers, and acetyl-CoA was identified as the potential key metabolite responsible for the visceral fat induced by BPP. These findings recommend that a great deal of attention should be paid to the obesogenic properties of BPP as a result of its widely utilized and persistence in the environment.
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