Nanomaterials
·
2021
·Vol. 11
·期 9
·2332
·
IF 5.076
Qiangqiang Feng,Yanyan Liu,Jitong Yan,Wei Feng,Shaozheng Ji,Yongfu Tang
A promising aqueous aluminum ion battery (AIB) was assembled using a novel layered K2Ti8O17anode against an activated carbon coated on a Ti mesh cathode in an AlCl3-based aqueous electrolyte. The intercalation/deintercalation mechanism endowed the layered K2Ti8O17as a promising anode for rechargeable aqueous AIBs. NaAc was introduced into the AlCl3aqueous electrolyte to enhance the cycling stability of the assembled aqueous AIB. The as-designed AIB displayed a high discharge voltage near 1.6 V, and a discharge capacity of up to 189.6 mAh g−1. The assembled AIB lit up a commercial light-emitting diode (LED) lasting more than one hour. Inductively coupled plasma–optical emission spectroscopy (ICP-OES), high-resolution transmission electron microscopy (HRTEM), and X-ray absorption near-edge spectroscopy (XANES) were employed to investigate the intercalation/deintercalation mechanism of Na+/Al3+ions in the aqueous AIB. The results indicated that the layered structure facilitated the intercalation/deintercalation of Na+/Al3+ions, thus providing a high-rate performance of the K2Ti8O17anode. The diffusion-controlled electrochemical characteristics and the reduction of Ti4+species during the discharge process illustrated the intercalation/deintercalation mechanism of the K2Ti8O17anode. This study provides not only insight into the charge–discharge mechanism of the K2Ti8O17anode but also a novel strategy to design rechargeable aqueous AIBs.Keywords:aluminum ion battery;K2Ti8O17anode;discharge–charge mechanism
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2021
·
IF 3.407
Xiaoming Wang,Yifan Gao,Fangming Deng,Yineng Xiao,Hailiang Zhang,Yifeng Huang
This paper proposes a flexible curved sensor array (FCSA) for wind pressure monitoring on train bogies. The fabricated FCSA made of composite conductive materials integrates strain and pressure sensing modules. The preparation ratio and internal conductive structure of the sensor are optimized to improve its strain detection precision and sensitivity. The accuracy of wind pressure monitoring data reaches 97 %, which is higher than current sensors. Experimental results show that the composite with hybrid filler of 1.75 wt % carbon black (CB) exhibits highly strain sensitive characteristics of good linearity, high accuracy, excellent stretchability (>50 %), high gauge factor (GF ∼10.2) and excellent durability over 500 stretching-releasing cycles under 30N. The designed FCSA demonstrates the practicality and effectiveness for wind pressure detection of train bogie, and provides a potential option for structural health monitoring (SHM) under large deformation.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4473-4482
·
IF 2.817
Huang Tianfu,Qiu Zehai,Hu Zhibiao,Zhang Zhusen
Efficient and low-cost electrode materials play a key role in improving the performance of energy storage device. In this study, the porous rod-like CuCo 2 O 4 nano-materials are synthesized by a simple hydrothermal method and subsequent heating annealing procedure. Benefiting from its advantages of the unique porous rod-like architectures with large specific surface area (98.27 m 2 g −1 ), the as-prepared CuCo 2 O 4 electrode displays a high specific capacitance of 778.29 F g −1 at 1 A g −1 , excellent rate capability (85.79% capacitance retention at 16 A g −1 ), and ultra-long cycling lifespan (91.65% specific capacitance retention after 4000 cycles) through the three-electrode system test. When assembled into the CuCo 2 O 4 //AC-ASC cell device, it provides a maximum energy density of 64.03 Wh/kg at a power density of 800.01 W/kg and extraordinary cycling stability (85.39% retention after 5000 cycles). These results firmly verify that the porous rod-like CuCo 2 O 4 nano-materials have great potential application for supercapacitors.
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高影响因子
Polymers
·
2021
·Vol. 13
·期 15
·2453
·
IF 4.329
Ri-si Wang,Ya Li,Xi-xiang Shuai,Rui-hong Liang,Jun Chen,Cheng-mei Liu
The development of effective heavy metal adsorbents has always been the goal of environmentalists. Pectin/activated carbon microspheres (P/ACs) were prepared through simple gelation without chemical crosslinking and utilized for adsorption of Pb2+. Scanning electron microscopy (SEM) revealed that the addition of activated carbon increased the porosity of the microsphere. Texture profile analysis showed good mechanical strength of P/ACs compared with original pectin microspheres. Kinetic studies found that the adsorption process followed a pseudo-second-order model, and the adsorption rate was controlled by film diffusion. Adsorption isotherms were described well by a Langmuir isotherm model, and the maximum adsorption capacity was estimated to be 279.33 mg/g. The P/ACs with the highest activated carbon (P/AC2:3) maintained a removal rate over 95.5% after 10 adsorption/desorption cycles. SEM-energy-dispersive X-ray spectrum and XPS analysis suggested a potential mechanism of adsorption are ion exchange between Pb2+and Ca2+, electronic adsorption, formation of complexes, and physical adsorption of P/ACs. All the above results indicated the P/ACs may be a good candidate for the adsorption of Pb2+.Keywords:pectin;activated carbon;microsphere;Pb2+;adsorption
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jian Cheng,Yirui Xie,Ying Wei,Dongrun Xie,Wenbo Sun,Ying Zhang,Menghong Li,Jiutao An
Dielectric barrier discharge (DBD) plasma coupled with Fe–Mn doped AC (Fe–Mn/AC) was used to enhance the degradation of tetracycline hydrochloride (TCH) wastewater. Fe–Mn/AC catalysts with different Fe/Mn molar ratios were prepared by hydrothermal method, and the physical and chemical properties of the samples were explored by different characterization techniques, including XRD, SEM , TEM and XPS. The results showed that the combination of DBD with Fe 2 –Mn 1 /AC system had the highest effect, and the degradation efficiency of TCH could reach 98.8 % after 15 min treatment, which was 25.5 % higher than that of DBD-only. With the increase of discharge voltage and catalyst dosage, the degradation efficiency of TCH promoted. And initial pH had little effect on the degradation of TCH. In the combined system, the Fe 2 –Mn 1 /AC catalyst could retain an excellent stability and reusability. The addition of dimethyl sulfoxide (DMSO) showed that ·OH participated in the TCH degradation. The generated O 3 might be catalyzed by Fe–Mn/AC catalyst to produce more ·OH. And more H 2 O 2 was produced in DBD-only system than that in DBD-catalytic system. Nine main degradation intermediate products in the combined system were detected by HPLC-MS, and three possible degradation pathways were proposed.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Liu,Dipan Xuan,Zhe Lu,Zhuang Wang,Qian Liu,Shuirong Li,Duo Wang,Yueyuan Ye,Dechao Wang,Zhifeng Zheng
Using carbon-based materials as substrates or additives is an effective strategy for the improvement of electrochemical properties of polypyrrole (PPy) in supercapacitors, while the interfacial interactions between them is not exactly clear, which limits the rational design of composite electrodes. Herein, the interfacial interactions are investigated by forming novel freestanding composite electrodes via depositing PPy on the surface of carbon foam (CF). After combination, the capacitance increases from 37.3 mF cm −2 to 364.0 mF cm −2 . Moreover, a superior capacitance retention (99.6%) can be achieved, after 10,000 charging/discharging cycles. Density functional theory (DFT) results show that the introduction of different oxygen-containing functional groups will lead to the difference of adsorption energy between carbon materials and PPy, thus affecting the cycling stability of composite materials. Moreover, the intermolecular interaction also affects redox properties of composite electrodes by changing the composition and energy of frontier orbits of the interfacial complexes involved in redox reactions. This study will provide a new perspective for purposeful regulating the electrochemical performance of composite electrodes.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Jingqi Zhang,Hanjun Hu,Jingbo Chao,Yang Tang,Pingyu Wan,Qipeng Yuan,Adrian C. Fisher,Frederic Coulon,Qing Hu,Xiao Jin Yang
In situ remediation of groundwater by zerovalent iron (ZVI)-based technology faces the problems of rapid passivation, fast agglomeration, limited range of pollutants and secondary contamination. Here a new concept of Magnesium–Aluminum (Mg–Al) alloys and in situ layered double hydroxides on is proposed for the degradation and removal of a wide variety of inorganic and organic pollutants from groundwater. The Mg–Al alloy provides the electrons for the chemical reduction and/or the degradation of pollutants while released Mg 2+ , Al 3+ and OH - ions react to generate in situ LDH precipitates, incorporating other divalent and trivalent metals and oxyanions pollutants and further adsorbing the micropollutants. The Mg–Al alloy outperforms ZVI for treating acidic, synthetic groundwater samples contaminated by complex chemical mixtures of heavy metals (Cd 2+ , Cr 6+ , Cu 2+ , Ni 2+ and Zn 2+ ), nitrate, AsO 3 3- , methyl blue, trichloroacetic acid and glyphosate . Specifically, the Mg–Al alloy achieves removal efficiency ≥99.7% for these multiple pollutants at concentrations ranging between 10 and 50 mg L −1 without producing any secondary contaminants. In contrast, ZVI removal efficiency did not exceed 90% and secondary contamination up to 220 mg L −1 Fe was observed. Overall, this study provides a new alternative approach to develop efficient, cost-effective and green remediation for water and groundwater.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Shen-Gen Gong,Yan-Hong Shi,Yang Su,Yan-Fei Li,Lei Ding,Jian Lin,Guo-Duo Yang,Bing Li,Xing-Long Wu,Jing-Ping Zhang,Hai-Ming Xie,Hai-Zhu Sun
Flexible asymmetric supercapacitor (FASC) systems are expected to exhibit not only excellent energy storage properties and safety but also satisfactory flexibility and robust integration. However, tremendous issues such as low capacitance, narrow voltage window, and poor mechanical properties still exist. In this paper, a novel kind of 3D lamellar Mn(OH)2 nanosheets on Cu-plated carbon cloth with a core-shell integrated framework (CPCC@CuO@Mn(OH)2) is fabricated to obtain the flexible material in the FASC. In this unique CPCC@CuO@Mn(OH)2 electrode material, the high theoretical specific capacity of CuO and Mn(OH)2 brings superior energy storage properties. Meanwhile, as the shell part, the deposited Mn(OH)2 layer and coated CuO layer work as both capacity contributors and substrate protectors, simultaneously maintaining the high capacitance and satisfactory flexibility of the electrodes. Therefore, the capacitance successfully achieves around 8140 mF cm–2 under 0.5 mA cm–2. Significantly, the assembled FASC (named as CPCC@CuO@Mn(OH)2//CC@AC) achieves a working voltage of up to 2.4 V. In the case of a high-power density close to 34.31 mW cm–3, its energy density reaches around 6.29 mW h cm–3. Moreover, the capacity holds 88.9% even after 10,000 cycles, showing its great application potential in the field of wearable electronics.
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高影响因子
Energy & Environmental Materials
·
2021
·Vol. 6
·期 1
·e12280
·
IF 15.122
Na Peng,Weijie Kou,Wenjia Wu,Shiyuan Guo,Yan Wang,Jingtao Wang
Developing laminar composite solid electrolyte with ultrathin thickness and continuous conduction channels in vertical direction holds great promise for all-solid-state lithium batteries. Herein, a thin, laminar solid electrolyte is synthesized by filtrating –NH 2 functionalized metal-organic framework nanosheets and then being threaded with poly(ethylene oxide) chains induced by the hydrogen-bonding interaction from –NH 2 groups. It is demonstrated that the threaded poly(ethylene oxide) chains lock the adjacent metal-organic framework nanosheets, giving highly enhanced structural stability (Young’s modulus, 1.3 GPa) to 7.5-μm-thick laminar composite solid electrolyte. Importantly, these poly(ethylene oxide) chains with stretching structure serve as continuous conduction pathways along the chains in pores. It makes the non-conduction laminar metal-organic framework electrolyte highly conductive: 3.97 × 10 −5 S cm −1 at 25 °C, which is even over 25 times higher than that of pure poly(ethylene oxide) electrolyte. The assembled lithium cell, thus, acquires superior cycling stability, initial discharge capacity (148 mAh g −1 at 0.5 C and 60 °C), and retention (94% after 150 cycles). Besides, the pore size of nanosheet is tailored (24.5–40.9 Å) to evaluate the mechanisms of chain conformation and ion transport in confined space. It shows that the confined pore only with proper size could facilitate the stretching of poly(ethylene oxide) chains, and meanwhile inhibit their disorder degree. Specifically, the pore size of 33.8 Å shows optimized confinement effect with trans -poly(ethylene oxide) and cis -poly(ethylene oxide) conformation, which offers great significance in ion conduction. Our design of poly(ethylene oxide)-threaded architecture provides a platform and paves a way to the rational design of next-generation high-performance porous electrolytes.
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高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 3
·764-772
·
IF 7.683
Wen Xi,Haibo Li
Designing novel nanostructured materials is very significant to enhance the desalination capacity enabled by capacitive deionization (CDI). In this work, a vertically-aligned CuAl-layered double oxide grown on reduced graphene oxide (CuAl-LDO/rGO) is proposed as a high-performance anode for hybrid CDI (HCDI). It is found that the morphology of CuAl-LDO is ultimately dependent on the loading mass of urea. As a result, the optimized CuAl-LDO/rGO exhibits a relatively high specific surface area, 3D porous structure and electrochemical behavior. When employed as an anode for HCDI, it demonstrated a high salt removal capacity of 64.0 mg g−1 at a cell voltage of 1.2 V in NaCl solution with an initial concentration of 1000 mg L−1. After 20 cycles, the capacity still remains at 58.0 mg g−1 which is ∼90% of the initial value, suggesting the superior cycling ability. Moreover, the phase transformation of CuAl-LDO/rGO at various stages indicates that the formation of Cu(OH,Cl)2·2H2O may be responsible for the capacity decay upon cycling. However, the morphology characterization realizes that the aggregation of Cu(OH,Cl)2·2H2O nanoparticles can be effectively inhibited within CuAl-LDO/rGO compared to that of randomly oriented CuAl-LDO nanoflakes, which accounts for the superior salt removal capacity retention. Besides, a comparison of HCDI performance is performed among different anodes, highlighting the advantages of CuAl-LDO/rGO. The good performance is attributed to the unique structure of CuAl-LDO/rGO as it provides many tunnels for diffusion of salt ions and active sites for intercalation.
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高影响因子
JOM
·
2019
·Vol. 72
·期 9
·3186-3194
·
IF 2.305
Li Yun,Yang Shenghai,Taskinen Pekka,He Jing,Chen Yongming,Tang Chaobo,Jokilaakso Ari
This study proposed a cleaner pyrometallurgical lead-acid battery (LAB) recycling method for lead extraction and sulfur conservation without an excessive amount of SO 2 generation. A reducing atmosphere was introduced to the lead paste recycling system to selectively reduce PbSO 4 to PbS. At the same time, PbO and PbO 2 components contained in the lead paste were also reduced to metallic Pb. Then, the intermediate PbS further reacted with a sulfur-fixing agent, typically Fe 3 O 4 , to generate PbO and FeS. Sulfur was transformed from PbSO 4 to PbS and finally conserved as FeS. Thus, SO 2 emissions and pollution were significantly eliminated. This work investigated the thermodynamic and experimental feasibility and phase conversion mechanism of this proposed method, the detailed lead extraction and sulfur fixing mechanisms were clarified, and the phase transformation and microstructural evolution processes were characterized. Additionally, a bench experiment of industrial, end-of-life LAB paste was conducted to detect the lead recovery and sulfur fixation efficiency.
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高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Yang Li,Cheng-Xiong Yang,Hai-Long Qian,Xu Zhao,Xiu-Ping Yan
The introduction of a functional moiety into a covalent organic framework (COF) is of great significance in promoting its wide applications. Here we show the one-pot synthesis of carboxyl-functionalized COF-TzDBd via the direct condensation of 1,3,5-tris(4-formyl-phenyl) triazine (Tz) and 4,4′-diamino-[1,1′-biphenyl]-2,2′-dicarboxylic acid (DBd). The prepared TzDBd showed good crystallinity, mesoporous pores, and high chemical stability. It was applied for ultrafast adsorption and the efficient elimination of triphenylmethane dyes. The adsorption isotherms, adsorption thermodynamics, kinetics, and reusability of the prepared carboxyl-COF were investigated in detail. The adsorption of crystal violet (CV) and brilliant green (BG) on TzDBd followed the pseudo-second-order adsorption kinetic model and reached equilibrium within 2 min at the initial concentration of 100 mg L–1. The adsorption of triphenylmethane dyes on TzDBd fit well with the Langmuir adsorption model and gave the maximum adsorption capacities of 307.7 and 276.1 mg g–1 for CV and BG, respectively. The predesigned mesoporous pores, conjugated phenyl structure, and negatively charged carboxyl groups on TzDBd significantly facilitate the adsorption kinetics for large cationic triphenylmethane dyes. The ultrafast kinetics, high adsorption capacity, and good reusability endow the carboxyl-functionalized COF with great potential for removing triphenylmethane dyes from an aqueous environment.
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