ELECTROCHEMISTRY COMMUNICATIONS
·
2023
·
IF 5.4
Lin Ge,Dong-Mei Huang,Qin-Chao Xu,Jing Shi,Shuai Chen
An innovative, high-performance, non-noble-metal-based oxygen reduction reaction (ORR) catalyst must be developed utilizing a new and cost-effective technique. ZrO 2 has the merits of high stability, low toxicity, good catalytic activity, and low enthalpy for atomic oxygen adsorption. However, the poor conductivity restricts its application as an ORR catalyst. Here, we successfully prepared ZrO 2 nanoparticles / nitrogen-rich two-dimensional carbon nanosheet composites as ORR catalysts using a straightforward, solvent-free, one-step pyrolysis approach. Due to the unique component and structure characteristics, ZrO 2 @N-C-900 demonstrates remarkable ORR performances in alkaline electrolytes, such as high half-wave potential (0.82 V vs. RHE), higher current density (J L = 6.4 mA cm −2 ), and outstanding long term stability (95 % for 36,000 s). Especially, when used in a Zn-air battery, ZrO 2 @N-C-900 exhibited a power density of 148 mW cm −2 , exceeding that of 20 % Pt/C.
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RSC Advances
·
2023
·Vol. 13
·期 41
·28389-28394
·
IF 3.9
Cheng-Lu Yang,Chen Liang,Chao Gao,Jun Guo,Bu-Ming Chen,Hui Huang
A novel Bi13S18I2 structure was synthesized using a facile one-pot hydrothermal method and further optimized as an anode material using graphene. The graphene/Bi13S18I2 composite achieved a high discharge capacity with an initial value of 1126.5 mA h g−1 and a high and stable discharge capacity of 287.1 mA h g−1 after 500 cycles compared with pure Bi13S18I2, which derives from the inhibited volume expansion and high electrical conductivity obtained from graphene. In situ XRD was performed to analyze the Li storage mechanism in depth. The results support the feasibility of the new ternary sulfide Bi13S18I2 as a promising lithium ion battery.
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RSC Advances
·
2023
·Vol. 13
·期 44
·31067-31076
·
IF 3.9
Yaopeng Liu,Wei Zhao,Yi Gao,Qing Zhuo,Tingting Chu,Wensheng Huang,Yin Zheng,Yingru Li
Herein we report the colorimetry and an electrochemical for the determination of dopamine (DA) by using MnO2 nanoparticles and graphene nanosheets composite (MnO2@G) that display oxidase mimicking property. MnO2@G could directly oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into a blue product (oxTMB) without extra oxidants such as H2O2. Nevertheless, the presence of DA will inhibit the TMB oxidation due to the presence of the competitive reaction of MnO2@G and DA, giving a product color change from blue to colorless. A colorimetric assay for detect the concentration of DA was worked out according to this finding. Response is linear in the 0.1 to 15 μM DA concentration range, and the detection limit is 0.14 μM. Wider detection range is achieved in an electrochemical method which is due to the pronounced electrocatalytic activity of MnO2@G. The MnO2@G was modified on the surface of the glassy carbon electrode in order to fabricate one type electrochemical sensor. The sensor achieves a wide detection two linear ranges from 0.4 to 70 μM, with the detection limit of 1.16 μM. The detection of DA in real serum sample proved that the nanozyme based on MnO2@G could be developed into a colorimetry and electrochemical dual-readout sensing platform.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Bin Xiang,Jingling Gong,Yuqing Sun,Jian Li
The poor mechanical durability and weak fouling resistance of oil/water separation membranes severely restrict their applications in industry. Herein, a robust PVA/GO@MOF membrane with fast photothermal self-cleaning capability was developed through facile chemical crosslinking and suction-filtration strategies. Attributed to the powerful underwater superoleophobicity, the PVA/GO@MOF membrane exhibited extraordinary anti-oil adhesion even for high-viscosity crude oil and continuous crude oil emulsion purification capability with stable flux (1020 L m −2 h −1 bar −1 ) and exceptional efficiency (> 99.3%) even after 60 min. Most importantly, in comparison to reported photocatalytic self-cleaning oil/water separation membranes, the PVA/GO@MOF membrane can degrade organic contaminants more rapidly with a higher degradation rate (99.9%) in 50 min due to the superior photothermal conversion capacity. The synergistic photothermal and photocatalytic effects significantly enhanced photodegradation efficiency, which created opportunities for in-depth treatment of complex oily wastewater. Besides, the obtained membrane displayed excellent chemical and mechanical durability with underwater oil contact angle (UWOCA) above 150° even in harsh environments, such as corrosive solutions, UV irradiation, ultrasound treatment, abrasion experiment and bending test. Therefore, the developed PVA/GO@MOF membrane with robust durability and fast photocatalytic self-cleaning property is highly expected to purify oily wastewater and degrade organic pollutants .
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 6
·1-14
·
IF 20.1
Liang Taixin,Song Ruidong,Chen Chong,Alomar Taghrid S.,Xiao Fei,AlMasoud Najla,El-Bahy Zeinhom M.,Yang Yuanyuan,Algadi Hassan,Sun Lufeng
In this work, graphene oxide–supported Cu/Co nano-catalysts with low scale and large surface area were prepared by solvothermal and heat treatment, and the composite of the catalyst and ammonium perchlorate was obtained by spray method. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) were used to analyze the surface morphology, phase composition, and electronic structure of the catalyst and composites. The Kissinger equation and differential scanning calorimetry (DSC) test were used to determine the thermodynamic data. The results demonstrate that when the heating rate was 5 K/min and the catalyst GO/Cu-Co-MOF-650 was mixed mechanically, the high-temperature decomposition temperature of AP was decreased by 100 °C, and the activation energy was decreased by 38.99 kJ/mol. By using a composite spray instead of mechanical stirring, AP@GO/Cu-Co-MOF-650 completely eliminated the low-temperature decomposition temperature of ammonium perchlorate, increased the high-temperature decomposition temperature by 117.9 °C, decreased the activation energy by 54.24 kJ/mol, and increased the heat release of ammonium perchlorate by more than four times. These results suggest that the composite of the catalyst and the ammonium perchlorate increased the specific surface area of these two materials in contact with one another, further enhancing the catalytic efficiency.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Long Peng,Zhixiong Liu,Zhicheng Liu,Junlin Huang,Wei Wang,Hong Yin,Binhong He,Yucan Zhu,Zhaohui Hou
Molecular modified graphene films (M-GFs) have the advantages of simple preparation and high electrochemical activity, which has a promising future in the field of electrochemical energy storage . However, the influence of molecular doping technology is rarely studied for electrochemical performance of the M-GFs, hindering the development of high-performance M-GFs. Herein, we have demonstrated that a selective adsorption self-assembly strategy can prepare M-GFs with higher performance than physical mixing method. The prepared M-GF exhibits a three-dimensional porous structure with active organic molecules support, and its interlayer spacing is evenly widened. The resulting M-GFs as cathode material of aqueous Zinc-ion hybrid supercapacitors (AZISCs) exhibits a high specific capacitance of 228F g -1 , and a good capacitance retention of 42% (@10 A g -1 ), which are 25% and 13% higher than those of the physical mixing method, respectively. Besides, the energy and power density of the devices can reach 82 Wh kg -1 and 20.3 kW kg -1 , respectively. After 5000 cycles of charge and discharge testing, the capacitance retention rate of the device can still reach 94%. The impressive results indicate that the M-GFs by selective adsorption self-assembly strategy could be a potential high-performance electrode material for the AZISCs..
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sheng Pang,Liangwei Cong,Youpeng Xu,Yiwei Sun,Dong Wang,Guoyu Qian,Zhi Wang
Typically, the X-ray diffraction spectrum of a highly oriented structure (HOS) MAX phase displays a prominent (002) characteristic peak. Surprisingly, this principle does not hold true for Ti 2 SC. Instead, the synthesized Ti 2 SC consistently exhibits a polyhedral structure (PS). Furthermore, even with hot-pressing sintering, the purity of Ti 2 SC remains relatively low. The primary factors contributing to anomalous crystal structures and low purity are insufficient crystal growth and limited reactant contact. In this study, we successfully achieved dual regulation of the crystal structure and purity of Ti 2 SC within the Ti/TiC/FeS 2 system, which was accomplished by enhancing reactant contact and controlling the growth rates of crystal planes. Notably, the intermediate products FeS and Fe, existing in a liquid phase at varying temperatures, played a crucial role in both the formation of Ti 2 SC and the growth of Ti 2 SC crystals. As a result, PS-Ti 2 SC and HOS–Ti 2 SC with purity greater than 99 wt% were successfully prepared. The formation of PS-Ti 2 SC can be attributed to the inadequate growth of each crystal plane at relatively lower temperatures (1500 °C). While the synthesis of HOS–Ti 2 SC necessitates the utilization of both a liquid phase and high temperature, as the epitaxial growth mechanism followed by vertical growth has been demonstrated to facilitate the generation of highly oriented crystals. The liquid phase facilitates the swift growth of Ti 2 SC crystals along the (001) crystal plane, while the (002) crystal plane necessitates a higher temperature (1760 °C) for relatively rapid growth. This work will open a new pathway for the development of the MAX phase from the perspective of crystal structure regulation and high purification preparation.
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Analytical Methods
·
2023
·Vol. 15
·期 42
·5630-5638
·
IF 3.1
Dongxue Zhang,Shuai Qu,Mingyue Wang,Yuhan Liu,Chen Xu,Hong Kan,Yingping Wang,Kai Dong
Aerogels have attracted considerable attention in sample pretreatment for their outstanding properties, such as the unique porous structure, large surface area and abundant modifiable active sites. The present research reports a three-dimensional interconnected porous network aerogel (PEI-AGO) manufactured based on graphene oxide (GO), polyethyleneimine (PEI) and agar as basic materials through a vacuum freeze-drying treatment. The PEI-AGO aerogel exhibits great potential as a solid phase extraction adsorbent for the selective purification of six endogenous plant hormones in conjunction with high performance liquid chromatography-electrospray ionization tandem mass spectrometry (LC-MS). Several factors affecting the extraction efficiency were investigated. Under the optimized extraction conditions, a wide linear range of 0.5–100 ng mL−1 with a good linearity (r > 0.9934) was observed. Low limits of detection (LODs) and limits of quantification (LOQs) were obtained in the range of 0.032–0.155 ng mL−1 and 0.107–0.518 ng mL−1, respectively. Furthermore, the relative recoveries for spiked ginseng samples exhibited remarkable consistency, ranging from 90.2% to 117.6%, with a relative standard deviation (RSD) of ≤9.4% (n = 3). In summary, PEI-AGO has proven to be an effective adsorbent for the pretreatment and enrichment of phytohormones which can be used for the determination of trace endogenous acidic plant hormones in ginseng leaves.
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RADIATION PHYSICS AND CHEMISTRY
·
2023
·
IF 2.9
Shizong Wang,Jianlong Wang
This study firstly reported the in-situ preparation of nitrogen-doped graphene oxide-supported nano Fe 3 O 4 (Fe 3 O 4 @NRGO) by ionizing radiation . The conversion of Fe(II) to iron oxide was modulated by absorbed dose in solution, which regulated the catalytic activity of Fe 3 O 4 /NRGO. When the initial concentration of Fe(II) was 0.5 mM and the absorbed dose was 10 kGy, the as-prepared catalyst (Fe 3 O 4 @NRGO-10) showed superior catalytic activity for activating peroxymonosulfate (PMS) to degrade phenol. In the presence of 0.4 mM PMS and 0.5 g/L Fe 3 O 4 @NRGO-10, the pseudo first-order kinetic rate of phenol degradation reached 0.0286 min −1 . Sulfate radicals, hydroxyl radicals and high-valent iron oxo made major contribution to phenol degradation. The superior catalytic activity of Fe 3 O 4 @NRGO-10 might be attributed to the synergistic effect of NRGO and Fe 3 O 4 , in which NRGO promoted the conversion of Fe(III) to Fe(II). Fe 3 O 4 @NRGO-10 exhibited good stability in the cycling experiments. In addition to phenol, the Fe 3 O 4 @NRGO-10/PMS system could degrade sulfamethoxazole, bisphenol A and atrazine, indicating the wide applicability. This study reported a facile way to prepare carbon-supported metal oxide catalysts and convenient way to modulate the catalytic activity by absorbed dose.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Huanhuan Zhang,Qunying Sun,Linyan Bian,Qiuming Peng,Shumin Han,Baozhong Liu,Yanping Fan
Developing noble-based catalysts with high activity is the key to realizing high-efficiency hydrogen generation. Herein, PdRh alloys with different ratios supported on active Ti 3 C 2 is designed by microwave-assisted reduction to enhance the dissociation of NH 3 BH 3 and H 2 O. Specially, Pd 1 Rh 4 /Ti 3 C 2 conveys an optimal turnover frequency ( TOF ) of 338 min −1 and activation energy ( E a ) of 33.8 kJ mol −1 at room temperature. The TOF of Pd 1 Rh 4 /Ti 3 C 2 is 7.3 times than that of Pd/Ti 3 C 2 and 4.8 times of Rh/Ti 3 C 2 because of the construction of dual-active sites of PdRh alloy and active Ti 3 C 2 . The introduction of a small number of Pd changes the chemical environment of catalysts and presents significant excitation effect on catalytic activity. Experimental investigation reveals PdRh alloy and active Ti 3 C 2 are beneficial for the adsorption and dissociation of NH 3 BH 3 and H 2 O (active Ti 3 C 2 activates H 2 O, PdRh activates NH 3 BH 3 ). This research provides experimental foundation for the design of noble-based catalysts with high catalytic activity.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 54
·115896-115906
·
IF 5.8
Liu Wenjuan,Wang Zihan,Chai Guoli,Deng Wenbo
The extensive application of carbon nanomaterials (CNMs) has attracted increasing studies concerned about its environmental impact. These studies focus on single exposure to CNMs, but repeated exposures with relatively low concentration are more likely to occur under actual exposure scenario. In this study, we studied the metabolic functional and structure of soil microorganism community under single and repeated exposures to multiwalled carbon nanotubes (MW), graphene (GR), and fullerene (C 60 ) by Biolog EcoPlates and high-throughput sequencing. Our findings revealed that repeated exposures to CNMs significantly increase the metabolic activity and diversity of the soil microbial community as compared with single exposure. Principal component and similarity analysis not only indicated that GR exerted a stronger effect on soil microbial diversity among three exposures compared to C 60 and MW, but also revealed that the metabolic activity of the soil microbial community was more affected by the exposure scenarios of CNMs than the type of CNMs. These findings elucidated the effect of CNMs under different exposure scenarios on soil microorganism community, providing a new perspective on the risk assessment of nanomaterials.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Fan Zhou,Yanqi Ma,Ying Chen,Li Zhang,Xinxin Sheng
Endowing composite coatings with robust anticorrosion properties for metal substrates in intricate corrosive environments, such as conferring self-healing and antibacterial capabilities through the integration of multifunctional nanofillers, constitutes a pivotal approach in the advancement of efficient anticorrosive coatings. In this study, a triple-functional anticorrosion coating entailed the simultaneous integration of graphene oxide (PG) with antibacterial capability, and BTA@ZIF-8/PM (PZ) with self-healing performance, into a waterborne epoxy (PGZ/WEP). The logarithm of the lowest frequency impedance modulus of PGZ/WEP demonstrated a notable value of 8.2 Ω cm 2 following a 28 days immersion in simulated seawater, indicating an escalation of approximately 2.7 orders of magnitude compared to that the reference of WEP. For the antibacterial capabilities of coatings, an enhanced antibacterial rate ( R ) of up to 55.9 % was observed. Moreover, an in-depth analysis was undertaken to explain the underlying anticorrosion, self-healing, and antibacterial mechanisms of composite coatings. In conclusion, the PGZ/WEP composite coating manifests self-healing, antibacterial, and anticorrosive functionalities, thereby demonstrating exceptional adaptability to intricate corrosion-prone environments.
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