CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xin Fan,Dayi Zhou,Yaqi Chen,Xinjian Li,Shan Gao,Wenting Ji,Yuewen Zhang,Qi Chen,Hongan Ma,Xiaopeng Jia
Compared to Te, Ni is found in abundance in the earth's crust. At the same time, the mechanical properties of Ni atom-substituted skutterudite are significantly improved. In this study, a series of S-filled Ni-substituted skutterudite compounds were synthesized by a high-pressure and high-temperature (HPHT) method in the synthesis pressure range of 1.0–3.0 GPa. The phase composition, microscopic morphology, and electrothermal transmission properties of the S x Co 3.6 Ni 0.4 Sb 12 ( x = 0, 0.05, 0.10, 0.20) samples were systematically characterized. Phase composition analysis showed that the introduction of S atoms into the intrinsic pores of skutterudite can improve the solid solution limit of Ni atoms in the Co sites of skutterudite. The filling limit of S increased with the synthetic pressure. Moreover, microscopic morphology analysis revealed that the filling of S atoms inhibited the growth of grains. A large number of lattice fringes in different directions were found in the sample, containing abundant microstructures such as lattice distortions and dislocation defects. Compared with the synthesized samples, S 0.05 Co 3.6 Ni 0.4 Sb 12 synthesized at 1.0 GPa had a maximum room temperature power factor of 7.98 × 10 −4 Wm −1 K −2 . The electrical properties of S 0.05 Co 3.6 Ni 0.4 Sb 12 samples stored for 6 months without any protective measures were tested at room temperature. No obvious changes in performance were observed, which proved that the HPHT method can synthesize stable samples. After several thermal cycles, the electrical properties of the S 0.05 Co 3.6 Ni 0.4 Sb 12 sample was tested for variable temperature, and it was found that the sample still had good stability. How the substitution of S atoms with Ni atoms reduces the lattice thermal conductivity can be explained by fitting the Callaway model. The S 0.05 Co 3.6 Ni 0.4 Sb 12 sample synthesized at 1.0 GPa had a maximum zT value of 0.46 at the test temperature of 773 K, which decreased to 0.43 after multiple thermal cycles at the same temperature.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Ruiming Chen,Tingting Hu,Shu Xing,Tao Wei,Jianbin Chen,Tianduo Li,Qingfen Niu,Zhengyang Zhang,Huijun Ren,Xiaoxu Qin
Hydrazine (N 2 H 4 ) and hypochlorite (ClO − ) are extremely harmful to the public health, so it is vitally necessary to detect them in living system. Herein, we developed a new phenthiazine-thiobarbituric acid based dual-analyte responsive fluorescent sensor PT for visually distinguishing and detecting N 2 H 4 and ClO − . PT underwent N 2 H 4 /ClO − -induced C C breakage, achieving olive-drab/brilliant green fluorescence lighting-up response towards N 2 H 4 /ClO − with superb specifity, ultra-sensitivity (detection limit: 15.4 nM for N 2 H 4 , 13.7 nM for ClO − ), and ultra-fast response (N 2 H 4 : <15 s, ClO − : <20 s). The mechanisms for sensing N 2 H 4 and ClO − were investigated with support of spectral measurements and DFT investigation. Sensor based paper-strip/silica-gel device was developed for in-field supervision and on-site monitoring of gaseous and aqueous N 2 H 4 and ClO − solution. In addition, the PT was also applied for quantitatively detecting N 2 H 4 and ClO − in soil, food, plants and bio-fluids. Moreover, PT was utilized to visualize exogenous N 2 H 4 and ClO − in living plants and live-cells, demonstrating this sensor utilized as a powerful tool to detect N 2 H 4 and ClO − in biological fields.
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International Journal of Applied Ceramic Technology
·
2023
·
IF 2.1
Xiao-Chun Deng,Xiao-Dong Kang,Guo-Hua Zhang
(HfNbTaZrTiMo)C-Co high entropy carbide cermet was fabricated by conventional vacuum sintering. The effect of WC addition on the mechanical properties of cermets was also investigated. For cermets without WC addition, with the extension of sintering time, the hardness of cermets first rose and then fell, while the fracture toughness showed a decreasing trend. The increase in sintering temperature led to a decline in hardness and an enhancement of fracture toughness. The (HfNbTaZrTiMo)C-15 wt. % Co cermet sintered at 1450°C for 2 h had the best comprehensive properties, with the hardness and fracture toughness of 16.36 ± 0.17 GPa and 7.19 MPa·m 1/2 , respectively. After adding WC, there was a typical black core (undissolved (HfNbTaZrTiMo)C phase)-gray rim (seven-component (HfNbTaZrTiMoW)C solid solutions) structure in the cermets. Meanwhile, Mo diffused into WC to form (Mo, W)C solid solutions. The formations of (HfTaZrNbMoTiW)C and (Mo, W)C solid solutions resulted in an improvement in hardness. In addition, since the addition of WC enhanced the wettability between carbides phase and Co phase, the comprehensive properties of cermets were improved. The hardness and fracture toughness of the (HfNbTaZrTiMo)C-42.5 wt. % WC-15 wt.% Co cermet sintered at 1450°C for 2 h were 17.42 ± 0.06 GPa and 8.22 MPa·m 1/2 , respectively.
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EcoMat
·
2023
·Vol. 6
·期 1
·e12422
·
IF 14.6
Zifen Fan,Panpan He,Huiying Bai,Jie Liu,Huajian Liu,Lijie Liu,Ran Niu,Jiang Gong
Interfacial solar evaporation is regarded as the promising technology to mitigate freshwater scarcity. However, when polluted water is used, toxic pollutants might accumulate in the bulk water. Herein, we report the production of Ni-MOF nanorod from waste poly(ethylene terephthalate) and fabricate bifunctional Ni-MOF-based evaporators. Owing to high light absorption and photothermal conversion, low thermal coefficient, and vaporization enthalpy, it shows an exciting evaporation rate (2.25 kg m −2 h −1 ) with good flexibility/durability, rated as one of most advanced evaporators. Density functional theory and COMSOL results show that the combination of nickel-sites in Ni-MOF and local heat plays a crucial role in peroxymonosulfate activation to produce reactive species. Thereby, it exhibits the high degradation activity of tetracycline. In outdoor, the freshwater production reaches 5.54 kg m −2 per day, and the tetracycline removal efficiency is 91%. This work provides a sustainable approach to produce solar evaporators capable of freshwater production and contaminant degradation.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Yaqi Chen,Xin Fan,Xinjian Li,Shan Gao,Haidong Yu,Wenting Ji,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Thermoelectric materials, as clean energy materials, can directly convert thermal energy into electrical energy. These materials have received significant attention owing to their environmentally friendly nature. Skutterudite thermoelectric materials feature excellent electrical properties and great potential for environmentally friendly and industrial applications. The thermal performance optimization of skutterudite is mainly achieved through framework atom substitution, lattice void filling, and recombination of nano second-phase. In this study, the significant optimization of the thermal properties of S0.05Co4Sb11.6Te0.4 with fullerene-C60 as a nano second-phase composite material was reported. At 773 K, the N-type 0.10C60-S0.05Co4Sb11.6Te0.4 (0.10C60-SKD) polycrystalline material featured a dimensionless figure of merit zT value of 1.34, which is 31% higher than that of the matrix material. The overall optimization of the thermoelectric properties of the material was achieved through the high-pressure and high-temperature (HPHT) synthesis method, combined with electronegative S element filling, Te element substitution, and the recombination of C60 nano second-phase. The experimental results indicated that the incorporation of C60 resulted in the formation of finer grains in the composite material with significant lattice distortion, dislocations, and abundant grain boundaries in its microstructure. Various phonon scattering mechanisms occurred within the material, effectively reducing the lattice thermal conductivity of the material. The stable structure of C60 molecules added to the matrix material can optimize the mechanical properties of the material. The composite sample with a C60 amount of 0.20 exhibited a Vickers hardness of 7.01(1) GPa. This study employed the HPHT method for the direct synthesis of C60 composite samples within 30 min and provides insights into improving the thermoelectric properties of skutterudite.
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CORROSION SCIENCE
·
2023
·
IF 8.3
Zhichao Shang,Xiaoping Cai,Farshid Pahlevani,Yan Zheng,Akbar Hojjati-Najafabadi,Xinran Gao,Baojing Zhang,Peizhong Feng
High porosity Co-Al-Fe intermetallic with 3D-microstructures were one-step synthesized via a novel thermal explosion reaction. A link between pore structure and permeability was established using 3D-XRM technology. The corrosion resistance of the samples with different Fe contents was investigated at 900 °C under an oxygen/sulphur atmosphere for up to 120 h. The results showed that the pore structure of the samples remains stable, and the internal matrices are intact due to the formation of a thin protective layer of Al 2 O 3 and Fe 2 O 3 on the surface of the product skeleton. In addition, inward diffusion of S leads to the formation of FeS nodules.
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ACS Catalysis
·
2023
·
IF 12.9
Yun Wang,Mengting Chen,Kaiyue Zhang,Haimei Wu,Jiale Wang,Yuran Cheng,Yingxin Liu,Zuojun Wei
Highly efficient transformation of renewable biomass and its derivatives into high-value-added chemicals and biofuels over non-noble-metal catalysts is attractive but challenging. Herein, we developed non-noble CoNi alloy nanoparticles confined in N-doped porous carbon (CoNi@NC) via simple pyrolysis of the metal–organic framework (MOF) precursor at 900 °C under an inert atmosphere. The as-obtained CoNi@NC catalyst exhibited higher performance than monometallic Co@NC and Ni@NC catalysts in the reductive amination of levulinic acid (LA) with benzylamine to N-benzyl-5-methyl-2-pyrrolidinone (BMP) under mild conditions of 130 °C and 3 MPa H2 for 6 h, achieving a full conversion of LA and a ≥ 99% yield of BMP. Detailed characterizations substantiated that multifunctional support and the significant synergistic effect between Co and Ni markedly enhanced the catalytic performance. Furthermore, CoNi@NC manifested outstanding recyclability (reusable 20 cycles without loss of activity), which was attributed to the well-dispersed CoNi alloy nanoparticles confined in the N-doped porous carbon and the anchoring of N species to metal nanoparticles. Additionally, the resultant CoNi@NC catalyst can be successfully applied in the one-pot transformation of LA/esters with amines/nitroarenes/nitriles to the corresponding N-substituted pyrrolidones, as well as the reductive amination of other carbonyl compounds with benzylamine to form N-heterocyclic compounds. Moreover, CoNi@NC enabled us to catalyze the continuous reductive amination of LA with amines in a trickle-bed reactor, which is a more promising, efficient, highly atomically economic, and green synthetic methodology, and exhibited excellent stability during the reaction over 36 h.
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Coatings
·
2023
·Vol. 13
·期 9
·1557
·
IF 3.4
Yan Gao,Xin Chen,Ping Xu,Jie Chen,Shihua Yu,Zhigang Liu,Xiaodan Zeng
A novel magnetic fluorescent nanoprobe (Fe3O4@ZnS@MPS(MFNPs)) was synthesized, which recognized and cooperated with Ag+ions, and a rapid method for detecting Ag+was established in solution. It was found by fluorescence spectroscopy analysis that the MFNPs could detect Ag+in PBS solution and, upon addition of Ag+ions, the fluorescence (FL) of MFNPs could be quenched significantly. The sensor has a low limit of detection (LOD) of 7.04 µM for Ag+. The results showed that MFNPs were extremely specific and sensitive for the quantitative detection of Ag+over a wide pH range. Then, the recognition mechanism between MFNPs and guest Ag+was explored via measures of infrared spectroscopy and electron microscopy. It was speculated that the oxygen atoms in the sulfonic acid group cooperated with Ag+to form a synergistic complexation. The assay was successfully used to determine the content of Ag+ in real samples.Keywords:magnetic fluorescent nanosensor;selective recognition;silver ion;3-sulfhydryl-1-propane sodium (MPS)
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Boxu Wang,Zheng Liu,Zhihong Li,Ningyi Xu,Xuejiao Zhang,Ruifang Su,Junyang Wang,Rui Jin,Chunyan Sun
Hg 2+ is highly toxic to human health and ecosystem. In this work, based on the unique fluorescent property of 2-Aminopurine (2-AP), the formation of T-Hg 2+ -T mismatch structure and the signal amplification of exonuclease III (Exo III) assisted target cycle, a fluorescent probe for facile and sensitive detection of Hg 2+ is constructed. The hairpin-looped DNA probe is rationally designed with 2-AP embedded in the stem and thymine-rich recognition overhangs extended at the termini. The cleavage of the double stranded DNA stem with stable T-Hg 2+ -T pairs catalyzed by Exo III is prompted to happen upon recognition of trace Hg 2+ . Under the optimal reaction conditions, there is an excellent linear relationship between Hg 2+ concentration and fluorescence intensity in the range of 7.5–200 nM with a detection limit of 0.38 nM. In addition, the detection results of Hg 2+ in Songhua River water and fish samples are satisfactory. The fluorescent probe avoids labeling additional quenchers or quenching materials and has strong anti-interference ability. Thus, the fluorescent probe has a broad prospect in practical application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yukai Chen,Ruizhe Wang,Ling Zhou,Rulin Dong,Jiahui Kou,Chunhua Lu
Hindering the recombination of photoinduced electron-hole pairs is of significance for enhancing photocatalytic performance. Applying a voltage to separate carriers offers an option to realize it. Thermoelectric materials own the ability to continuously sustain a voltage when a temperature difference exists between its two sides. However, maintaining the thermoelectric effect without wasting additional energy remains a challenge. Herein, a C 3 N 4 /Polyaniline/Poly(vinylidene fluoride) cilia array was fabricated to reach efficient photocatalysis through thermoelectric effect and photothermal effect. The cilia array structure offers more than 40% of light absorbance compared to the film. Hence, the infrared light in sunlight, which was usually omitted in photocatalysis, was transformed into heat. Through the unique design which draws upon the huge difference in thermal conductivity of air and water, a temperature gap was formed between the top and bottom sides of the cilia array by half-submerging it in water. Therefore, the photocatalytic efficiency was improved by 84.4%. This work achieves an energy-saving method to enhance photocatalytic performance by activating thermoelectric effect through infrared light, shedding light on the application of multi-modes enhanced photocatalysis.
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MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Yaqi Chen,Xin Fan,Shan Gao,Wenting Ji,Xinjian Li,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Electronegative S-filled skutterudite compounds have attracted considerable attention due to scattering of low-frequency phonons (35–50 cm − 1 ), but there are few reports on S-filled double-substituted skutterudite. In this work, a series of S-filled Te-Sn double-substituted skutterudite compounds were synthesized using high pressure and high temperature (HPHT) method. The phase composition, microstructure, and thermoelectric properties of S x Co 4 Sb 1 1 Te 0 . 7 Sn 0 . 3 ( x = 0 , 0.05, 0.10, 0.20) samples were systematically determined. The results show that the introduction of S increases the substitution limit of Te in the Sb site. Under the combined effect of the sample synthesis pressure and S filling, the nucleation density of the sample grains increases and the grain size decreases. At the same time, there are numerous special microstructures in the samples synthesized in a high-pressure environment. Thermoelectric performance studies show that a small amount of S filling optimizes the Seebeck coefficient of the sample and increases the power factor (PF). With an increase of the amount of S introduced, the thermal conductivity of the samples decreases significantly. Therefore, the maximum zT value of an S 0 . 0 5 Co 4 Sb 1 1 Te 0 . 7 Sn 0 . 3 sample synthesized at 2.5 GPa pressure is 0.17 at room temperature. The maximum zT value of the sample is 1.26 at 773 K.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lei Jia,Linwen Jiang,Jiawen Hu,Jiawei Jin,Siqin Yan,Anhua Wu,Xiaofeng Zhang
Optimizing the impedance matching via electromagnetic adjustment is considered an effective strategy to accomplish exceptional electromagnetic wave absorption (EMA) performance. Here, we report an efficient and green process to obtain the carbonitriding FeCoNiCr high-entropy alloys (HEAs) with flake-shaped morphology by using organic cyanide (Dicyandiamide, C2H4N4) as nitrogen and carbon sources. The carbonitriding effects on the phase structure, magnetic properties, mechanical hardness, corrosion resistance, high-temperature oxidation resistance, and EMA performances were investigated systematically. The carbonitriding process optimized the impedance match by decreasing the dielectric constant via introducing the nonmetallic C and N. The #CN10 sample exhibited outstanding EMA performances with a minimum reflection loss of −32.3 dB at 7.89 GHz and a broad effective bandwidth of 4.46 GHz, which covered the majority of X-band. In addition, the carbonitriding FeCoNiCr HEAs had great mechanical properties, excellent corrosion resistance, and high-temperature oxidation resistance, indicating excellent adaptability to harsh environments as well as good EMA performances. This work provides a new idea for the preparation and design of carbonitriding EMA materials.
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