iScience
·
2022
·
IF 6.107
Yuqi Zou,Chao Liu,Zhihe Ren,Yuqi Zhang,Zichang Liu,Yinsheng Xu,Chong Hou,Lvyun Yang,Sheng Liang,Guangming Tao
A small-scale delivery medium for CO 2 laser energy with stable performance, flexibility, and high-strength is crucial in extreme laser processing environments, especially for minimally invasive surgery in high-humidity, twisty and narrow channels. Here, flexible and robust multimaterial infrared fibers made of selenium-based chalcogenide glasses and thermoplastic polymer were developed with a low loss of 7.18 dB/m at 10.6 μm. The resulting fibers were capable of stably delivering single-mode CO 2 laser with 0.42 W average power. Moreover, to achieve precise control over the fibers in the practical clinical environment, customized co-polymers of polyphenylene sulfone resin and polyvinylidene fluoride were used as the fiber built-in jackets. Consequently, the fibers exhibited hydrophobicity, thermostability, high tensile strength, and low bending stiffness. The results demonstrated that the fibers can be used to deliver CO 2 laser energy for fabric cutting and bio-tissues ablation, making them attractive for CO 2 laser material processing and minimally invasive laser surgery.
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高影响因子
Electronic Materials Letters
·
2024
·Vol. 20
·期 4
·459-473
·
IF 2.1
Tang Jing,Xu Hui,Chen Yong,Zhu Yuanqiang
Currently, transition metal tungstates are emerging as electroactive materials for supercapacitors due to their excellent electrical conductivity and electrochemical properties. Small amounts of transition metal ions doping can affect the physical and electrical properties of transition metal tungstates. In this study, Co ion-doped NiWO 4 amorphous composites (CNWO) were synthesized using a simple and effective hydrothermal method and utilized as the cathode material for supercapacitors. The structure and electrochemical properties of NiWO 4 and CNWO composites were investigated using various testing techniques. Specifically, when the cobalt ion doping amount is 10%, the corresponding CNWO-10 electrode material exhibits a specific capacitance of 804 F g −1 at 1 A g −1 , and at a current density of 10 A g −1 , the capacitance retention rate reaches 66.7%, demonstrating good rate performance. Additionally, an asymmetric supercapacitor device was constructed using CNWO-10 and activated carbon (AC) as positive and negative materials, respectively. Which could cycle reversibly under a potential window of 2.1 V. The device demonstrates a maximum specific capacitance of 76.5 F g −1 at 0.5 A g −1 , and a high energy density of 47 Wh kg −1 at a power density of 527 W kg −1 . Furthermore, 96% capacitance cycling stability is maintained after 5500 cycles at a trapezoidal current density. Moreover, the electrical conductivities of NiWO 4 and CNWO-10 samples are 9.01 × 10 –8 S m −1 and 8.93 × 10 –6 S m −1 , attributed to the Co ion-doping that can reduce the gap width of the forbidden band to enhance conductivity. These results suggest that CNWO composites can serve as promising high-capacity electrode materials for high-performance supercapacitors in alkaline electrolytes. Graphical Abstract
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Liwei Sun,Jingyi Luo,Ming Gao,Shaokun Tang
Developing solid materials with high CO 2 adsorption capacity and catalytic activity has been a hotspot due to the greenhouse effect. In this work, bi-functionalized ionic liquid 1-vinyl-3-methoxyethyl imidazolium glycinate ([VMOEim][Gly]) was copolymerized with crosslinker divinylbenzene (DVB) to obtain bi-functionalized ionic liquid porous copolymers P( n DVB-[VMOEim][Gly]) and HP( n DVB-[VMOEim][Gly]). These copolymers possess loose stack of small particles or laminates, and they contain mesopores and a small number of micropores. For HP(0.6DVB-[VMOEim][Gly]), surface area reaches up to 508 m 2 ·g −1 and the initial decomposition temperature is about 180 °C. Then these porous copolymers were applied for CO 2 adsorption at 25 °C and cycloaddition reaction of CO 2 with epichlorohydrin under ambient pressure and cocatalyst-free condition. The maximum CO 2 capture capacity is 64.5 mg/g with HP(0.6DVB-[VMOEim][Gly]) as adsorbent. The effects of catalyst type, catalyst dosage, reaction time and temperature on the yield of cyclic carbonate were also investigated. The optimum conditions are 4 wt% of HP(0.6DVB-[VMOEim][Gly]) (based on the epichlorohydrin) as catalyst at 130 °C for 10 h, and the yield of 4-(chloromethyl)-1,3-dioxolan-2-one can reach 94%. Furthermore, the catalytic activity of HP(0.6DVB-[VMOEim][Gly]) maintains and the yield is 91% after five-cycle experiment. The mechanism of cycloaddition reaction was also discussed.
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高影响因子
Nano Energy
·
2020
·
IF 16.602
Jianhua Zhu,Jia Fan,Tianle Cheng,Mengyang Cao,Zhenhe Sun,Rui Zhou,Lu Huang,Dong Wang,Yanguang Li,Yingpeng Wu
Bilayer-Bi 12 O 17 Cl 2 nanosheets (BBNs), a kind of unusual stoichiometric bismuth oxychloride, with abundant oxygen vacancies (OVs) were synthesized by a simple but efficient hydrothermal method , and acted as the generalist material for Potassium-ion battery (PIB) anode and CO 2 reduction reaction. The BBNs with a thickness of ~1.5 nm offer a large electrode-electrolyte contact interface and a short path for K + diffusion. Importantly, the abundant OVs not only provide more active sites but also promote ionic transmission and electrical conductivity . As an anode for PIB, it provides a high initial discharge capacity (627.5 mA h g −1 at 500 mA g −1 ), high rate performance (420 mA h g −1 at 10 A g −1 ) and outstanding cycle performance (198 mA h g −1 after 1500 cycles at 10 A g −1 ). When evaluated as the electrocatalyst for CO 2 reduction, the BBNs exhibited an impressive activity, selectivity and stability ( J HCOO - = 11.5 mA/cm 2 at −0.89 V, Faradaic efficiency >92%, and durability for >12 h). Considering the easy preparation, low cost, and fast-kinetics, this promising strategy and associated opportunities demonstrate great potential for energy storage or electrocatalysts.
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高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 15
·154005
·
IF 3.404
Chunyang Dong,Songchang Hu,Mingyang Xing,Jinlong Zhang
A spatially separated, dual co-catalyst photocatalytic system was constructed by the stepwise introduction of RuO2 and Au nanoparticles (NPs) at the internal and external surfaces of a three dimensional, hierarchically ordered TiO2−SiO2 (HTSO) framework (the final photocatalyst was denoted as Au/HRTSO). Characterization by HR-TEM, EDS-mapping, XRD and XPS confirmed the existence and spatially separated locations of Au and RuO2. In CO2 photocatalytic reduction (CO2PR), Au/HRTSO (0.8%) shows the optimal performance in both the activity and selectivity towards CH4; the CH4 yield is almost twice that of the singular Au/HTSO or HRTSO (0.8%, weight percentage of RuO2) counterparts. Generally, Au NPs at the external surface act as electron trapping agents and RuO2 NPs at the inner surface act as hole collectors. This advanced spatial configuration could promote charge separation and transfer efficiency, leading to enhanced CO2PR performance in both the yield and selectivity toward CH4 under simulated solar light irradiation.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Yu-Shuai Xu,Hong-Hui Wang,Qi-Yuan Li,Shi-Nan Zhang,Si-Yuan Xia,Dong Xu,Wei-Wei Lei,Jie-Sheng Chen,Xin-Hao Li
The development of two-dimensional heterogeneous catalysts with highly exposed active site areas for heterogeneous catalytic systems is highly promising for achieving the green transformation of small molecules. 2D transition metal carbides (TMCs) show great promise for catalysis and carbon capture but suffer from heavy aggregation and autooxidation. Mass transfer barrier is also a standard problem of lamellar TMCs caused by slight aggregation of layers. Here, we successfully developed a method to prepare “ladder-like” heterojunctions of Mo 2 C layers confined inside nitrogen-rich carbon sheaths (2D-Mo 2 C@NC) via an effective oxygen-diffusion etching strategy, acting as efficient catalysts for CO 2 fixation. The enhanced electron enrichment of the as-integrated 2D-Mo 2 C subunits induced by the Schottky barrier could further keep the exposed Mo 2 C surface from possible autooxidation and aggregation confronted by conventional 2D TMCs. The experimental results and density functional theory (DFT) calculation further demonstrate that electron-rich Mo 2 C could boost the adsorption and activation of CO 2 for universal carbonylation of various diamines, providing a turnover frequency value (TOF) of 10.2 h −1 to produce benzimidazolone, which is 5.2 times of that of the state-of-the-art catalyst in the literature under even critical conditions.
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高影响因子
Frontiers in Energy
·
2024
·
IF 3.1
Zhang Chen,Zhang Duoyong,Zhang Xinqi,Tian Yongqiang,Wang Liwei
Mesoporous biochar (MC) derived from biomass is synthesized using a dual-salt template method involving ZnCl 2 and KCl, followed by impregnation with polyethyleneimine (PEI) of varying average molecular weights under vacuum conditions to construct a core-membrane structure for enhancing carbon capture performance. The resulting MC exhibits a highly intricate network of micropores and abundant mesopores, along with defects in graphitic structures, effectively facilitating robust PEI loading. Among the PEI-modified samples, PEI-600@MC demonstrates the highest CO 2 sorption capacity, achieving approximately 3.35 mmol/g at 0.1 MPa and 70 °C, with an amine efficiency of 0.32 mmol CO 2 /mmol N. The introduction of amine functional groups in PEI significantly enhances the sorption capacity compared to bare MC. Additionally, PEI with lower average molecular weights exhibits a superior sorption performance at low pressures but shows a reduced thermal stability compared to higher molecular weight counterparts. The area of sorption hysteresis loops gradually decreases with increasing temperature and average molecular weight of PEI. The equilibrium sorption isotherms are accurately modeled by the Langmuir equation, revealing a maximum sorption capacity of approximately 3.53 mmol/g at 70 °C and saturation pressure. This work highlights the potential of dual-salts templated biomass-derived MC, modified with PEI, as an effective, widely available, and cost-efficient material for CO 2 capture.
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高影响因子
POWDER TECHNOLOGY
·
2022
·
IF 5.64
Jie Yin,Jun Zhang,Li Lv,Hui Zhong
Heterogeneous condensation preconditioning technology has generated broad interest in removing fine particles from coal-fired flue gas due to its economic and environmental advantages. Here, a flow cloud chamber was used to study the effect of 0%–90% CO 2 concentrations on the growth performance of insoluble fine particles with different operational conditions. The results suggest that a higher CO 2 concentration in the particle growth environment is detrimental to the fine particles growth. The higher the CO 2 concentration, the worse the growth performance. The adverse effect of CO 2 on the growth performance decreases with the increase of growth time and the increase of supersaturation caused by temperature, and does not change significantly with the increasing particle concentration.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Luming Qi,Yu Han,Gaozhi Bai,Qing Liu,Zhaoyang Fei,Xian Chen,Zhuxiu Zhang,Jihai Tang,Mifen Cui,Xu Qiao
Amine adsorbents have been widely investigated for direct CO 2 capture from air. However, the low amine efficiency of the widely-studied amine sorbents is the critical factor to hinder the practical application under dry conditions. Herein, we developed the brush-like cetyltrimethylammonium chloride (CTAC) templating strategy to prepare micro-mesoporous silica nanoparticles (MMSN-X) and TEPA-functionalized adsorbents (MMSN-X/TEPA-Y). The character of samples was investigated by transmission electron microscopy , N 2 adsorption-desorption, Fourier transform infrared spectroscopy, thermal gravimetric analyzer and X-ray photoelectron spectroscopy. The adsorbent (MMSN-30/TEPA-50) with appropriate amount of brush-like CTAC exhibited higher CO 2 adsorption capacities (3.68 mmol/g adsorbent under simulated dry air conditions) than that of the adsorbents with none or less additives. The kinetic and thermodynamic model were applied to investigate the adsorption rate control factors and adsorption behavior of CO 2 adsorbents with brush-like CTAC. Moreover, with the effect of brush-like CTAC, the significant variation of adsorption product (conversion from carbamate (CO 2 /N = 0.5) to carbamic acid (CO 2 /N = 1)) was detected by in situ Fourier transform infrared spectroscopy . These results demonstrated that the combination of CO 2 and amine was altered in the presence of brush-like CTAC and thereby the amine efficiency was enhanced, which could be expected to be an efficient adsorbent for CO 2 from air in practical applications.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Liji Zhang,Yuhang Zheng,Yafei Guo,Shengbin Bai,Meishan Song,Pu Huang,Xinzheng Wei,Jian Sun,Changhai Li,Jiaqing Zhang,Chuanwen Zhao
Thermochemical energy storage (TCES) by means of reversible chemical reactions represents a promising strategy for harnessing renewable energy and recovering industrial waste heat. In this work, alkali metal nitrate promoted MgO composites were synthesized, and the MgO–CO2 working pair was suggested as an alternative candidate for harvesting intermediate-temperature industrial waste heat. However, it remains unclear how operating parameters would affect the heat storage density, and the long-term cycling stability of the alkali metal nitrate promoted MgO composites under harsh conditions close to practical application scenarios needs to be clarified. The objectives of this work are to expound the effects of operating parameters on TCES performance and to evaluate the long-term cycling stability of the alkali metal nitrate promoted MgO composites. With increasing NaNO3 content, the heat storage density of NaNO3–MgO increases dramatically first and then exhibits no significant change. With rising carbonation temperature, the heat storage density of the 10NaNO3–MgO composite increases first and then declines marginally, while it increases with the increasing CO2 partial pressure. Doping alkali metal nitrate eutectic mixtures adversely affects the heat storage density. 10NaNO3–MgO exhibits a high heat storage density of 2291 kJ/kg at 340 °C in 100% CO2. The 10NaNO3–MgO and 10(K–Na)NO3–MgO composites suffer a significant decline in heat storage density within 10 consecutive cycles, while 10(Li–Na)NO3–MgO retains good stability with a slight decrease of heat storage density from 1073 to 770 kJ/kg in 50% CO2. The desired 10(Li–Na)NO3–MgO is suggested as a promising material for TCES application.
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高影响因子
ACS Applied Engineering Materials
·
2023
·
IF 0
Sheng Chang,Yimin Xuan,Qi Wang,Kui Wang
Bimetallic catalysts are ideal candidates for boosting electrochemical CO2 reduction reaction (CO2RR). However, these catalysts have largely relied on tedious synthesis technology and play electrolytic role with the help of a metal substrate or gas diffusion electrode. Herein, noble metal-free In–Sn nanoparticles (NPs) with a core–shell structure that contains a hybrid In–Sn core and native Sn-doped In2O3 shell have been successfully grown on the copper foam by the potential-driven volume diffusion strategy. These NPs which spontaneously result in the formation of the In–Sn bimetallic interface by adjusting the element composition significantly boost the yield of CO2 reduction into formate over a wide potential window (−0.77 to −1.17 V versus reversible hydrogen electrodes) compared with pure single-metal counterparts. The optimized In–Sn NPs deliver a great partial current density of 57.6 mA cm–2 and high faradaic efficiency of 97.0%, a remarkable performance in comparison to the state-of-the-art reported bimetallic catalyst. Such excellent performance is revealed via in situ Raman analyses and theoretical calculations, indicating that the unique structure of In–Sn NPs with the In–Sn bimetallic interface favorably regulates the reaction dynamics and facilitates the adsorption of the *OCHO intermediate.
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Advanced Energy and Sustainability Research
·
2022
·Vol. 3
·期 6
·2100200
·
IF 0
Ping She,Yuanyuan Qi,Tengfei Bao,Hongbang Rui,Buyuan Guan,Heng Rao,Jun-Sheng Qin
Molecular catalysis for photocatalytic CO 2 reduction (PCR) has recently attracted much attention, whereas its scaled practical application is usually limited by the difficulty of recycling and its photochemical instability in homogeneous solutions. Immobilization of molecular catalysts on solid matrices, that is, covalent bonds or noncovalent interactions, provides a great blueprint to tackle this issue. Herein, a bioinspired self-supporting phthalocyanine@ZnIn 2 S 4 (Pc@ZnIn 2 S 4 ) foam by growing ZnIn 2 S 4 nanosheets on the commercialized polyurethane foam (PF) followed by loading amino-modified cobalt phthalocyanine (CoPc–NH 2 ) is developed. The self-supporting Pc@ZnIn 2 S 4 PF carrier can be directly taken out of the reaction system for the next reaction cycle without any other procedures. The optimized Pc@ZnIn 2 S 4 PF demonstrates superior PCR efficiency under visible light ( λ = 420 nm), achieving 474.65 μmol CO g −1 catalyst after 8 h. The superior PCR performance is attributed to the elevated light-harvesting ability induced by the porous foam structure and the enhanced charge separation efficiency facilitated by the dimension-matched interface between ZnIn 2 S 4 and Pc. The special design of the immobilization molecular catalyst on solid supporters presented herein develops an efficient strategy for solar-driven energy conversion.
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