Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2557-2574
·
IF 11.806
Lai Changwei,Guo Yao,Zhao Huihui,Song Haixiang,Qu Xiaoxiao,Huang Mina,Hong Suck Won,Lee Kwan
The double ion-buffering reservoirs of asymmetric supercapacitors (ASC) have drawn enormous interest due to their excellent electrochemical performance. Herein, we have prepared the hierarchical porous sandwich-like Co 3 O 4 -rGO-CNT > N-PEGm (Co 3 O 4 -RGOC, in which rGO was short for reduced graphene oxide and CNT > N-PEGm was modified with methoxypolyethylene glycol by nitrene chemistry) ternary composites via a solvothermal method. Remarkably, the Co 3 O 4 -RGOC composites exhibited unique structural features of the opened honeycomb-like structures as “ion-buffering reservoirs.” Moreover, in Co 3 O 4 -RGOC composites, both the intermediate sandwich layers of rGO sheets and the interpenetrating CNT > N-PEGms can form double conductive networks as express electron transport channels to improve the electronic conductivity by synergistic effect. The promising Co 3 O 4 -RGOC composites can be summarized as capacity of 138.5 mAh g −1 (capacitance of 1420.5 F g −1 ) at 0.5 A g −1 . Furthermore, the 3D rGO-PANI (PANI, polyaniline) aerogels as negative electrode materials also have been prepared by facile in situ polymerization and chemical reduction process. The 3D rGO-PANI presented excellent electrochemical performance of 218.8 F g −1 (capacity of 60.8 mAh g −1 ) at 0.5 A g −1 due to the hierarchical interconnected porous network structures. Finally, the corresponding asymmetric supercapacitors of Co 3 O 4 -RGOC//3D rGO-PANI devices exhibited a high energy density of 41.3 Wh kg −1 at power densities of 775 Wk g −1 with excellent electrochemical performance and long cycle performance. Our work can present a new concept to design the innovative asymmetric supercapacitors with double ion-buffering reservoirs as a combinatorial strategy for useful energy storage and conversion.
Graphical abstract
The novel double “ion-buffering reservoir” asymmetric
supercapacitors are fabricated with the double conductive networks of
battery-type Co 3 O 4 -RGOC ternary composites as positive
electrode and 3D rGO-PANI aerogels as negative electrode for energy storage-conversion application.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Shanjin Hu,Xiaoxue Du,Yanhui Bi,Ping-Ping He,Yali Mu,Chang Liu,Qi Gao,Mengyuan Yin,Weiwei Guo
As smart soft materials with programmable functions and excellent biocompatibility, DNA hydrogels have great potential in a variety of application fields, such as in the fabrication of soft biosensing devices. However, most DNA hydrogels are formed by self-assembly of multibranched DNA structures or with the assistance of enzymatic processes or chemical modifications, which significantly increases the complexity of material designing and the cost of construction. Herein, we report on the construction of responsive DNA hydrogel based on the self-assembly of one short single-stranded DNA (ssDNA), and the self-assembly can also occur within a polymeric matrix to construct interpenetrating network (IPN) hydrogel. Mechanism investigation reveals that the self-assembly between the short ssDNA strands leads to the formation of long linear DNA structures and looped structures, and the entanglement between these DNA assemblies at high concentrations results in the formation of three-dimensional hydrogel networks. By programming the sequence of the ssDNA strand, pH-responsive DNA hydrogel or catalytic DNA hydrogel can be constructed. Furthermore, the interpenetration of the catalytic DNA networks within a polyacrylamide hydrogel matrix leads to the formation an IPN hydrogel with higher structure stability and with excellent catalytic activity on the polymerization of aniline into conductive polyaniline (PANI). The successful construction of conductive PNAI patterns templated by the IPN hydrogel films is further achieved, which may hold potential in soft electronic and biosensing applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xing Wu,Wenxuan Hu,Jiahuan Qiu,Biao Geng,Miao Du,Qiang Zheng
MXene , a kind of booming two-dimensional (2D) nanomaterials , has exhibited a promising application on free-standing high-performance supercapacitors. However, researches on MXene-based cathodes are still under development because its susceptibility to oxidation . Herein, a flexible free-standing polyaniline@MXene-carbon nanotubes (CNTs) film was prepared by a delicately-designed solvent-assisted self-assembly method followed with a vacuum filtration process. The zero-dimensional (0D) polyaniline (PANI) nanoparticle , which is often used as a cathode nanomaterial, was coated on the surface of 2D MXene nanosheets by solvent-assisted self-assembly to prevent MXene from oxidation and provide high specific capacitance simultaneously. The one-dimensional (1D) CNTs were introduced to endow the composite with well mechanical strength and flexibility. The ternary composite film delivers an excellent mechanical performance with a tensile strength of 99.4 MPa, a high specific capacitance of 463 F g −1 at 5 mV s −1 , and good cyclic stability with 92 % capacitance retention after 10,000 cycles. The asymmetric supercapacitor device assembled with the ternary composite film as cathode and the prepared free-standing MXene-CNTs as anode achieves a high energy density of 10 Wh kg −1 and an exceptional power density of 2808 W kg −1 .
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Cheng Li,Xiao Wang,Meng Zhang,Yue Sun,Yexiang Cui,Yanji Zhu,Huaiyuan Wang
Inert inorganic anti-corrosion fillers enjoy the advantages of stable performance, but most of them face the problems of poor compatibility and disability. Therefore, strategies about addressing the above problems need to be developed. Herein, based on interface enhancement strategy, one typical inert inorganic filler h-BN was armed with fluoro-substituted polyaniline (PFAN). To this end, diazotization reaction was utilized to introduce aniline group to h-BN, and emulsion polymerization was employed to grow the micro-size copolymer of aniline and 2-fluoroaniline. Benefitting from the above interface enhancement attempt, the compatibility of h-BN with resin was enhanced, which was explained by the chemical armed PFAN participated in the curing process of epoxy. Moreover, the disability of h-BN was also improved owed to this interface armor. Therefore, combining the fully developed barrier properties of h-BN with passivate ability of PFAN, the coating containing a small addition amount (0.9 wt%) of the composite fillers to epoxy coatings significantly improved their long-term corrosion resistance , which was confirmed by the EIS result that its low frequency impedance value was maintained above 10 10 and was about 10 3 times larger than that of pure EP coating after being immersed in 3.5 wt% NaCl solution for 120 days.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Dong Shi,Mingzhi Yang,Baoguo Zhang,Haixiao Hu,Zizheng Ai,Yongliang Shao,Jianxing Shen,Yongzhong Wu,Xiaopeng Hao
Boron carbonitrides (BCN) have been widely concerned in the field of energy storage and conversion. However, the energy storage mechanism of electrical double-layer behavior and their stacked-layer structure severely limit the improvement of capacitance, thereby hindering their further development in energy storage. Therefore, an ultrasonic-ball milling method was first chosen to obtain BCN nanosheets, together with a feasible way of polyaniline (PANI) modification performed to boost the capacitive reaction of BCN nanosheets. For the first time, a BCN-PANI-based symmetric supercapacitor device can reach a high voltage window of 3.0 V when 1 M Et 4 N·BF 4 was chosen as the electrolyte. The working voltage of 3.0 V is three times that of a device with pure PANI with the ultrahigh energy density of 67.1 W h kg −1 , superior to most of the reported PANI-based devices. The eminent electrochemical performance provides a promising strategy to pave the way for configuring carbon-based multiple composite electrodes for other energy storage devices.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Honglong Zhang,Zhenyu Shi,Jun Ma,Fuyi Cui,Jing Zhang,Timothy J. Strathmann
In this study, a representative redox mediator, 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO), and its para-substituted derivatives (TEMPOs: 4-hydroxyl-TEMPO, 4-acetylamino-TEMPO, and 4-amino-TEMPO) significantly accelerated the abatement of trace organic contaminants (TrOCs, i.e., bisphenol-A (BPA), phenol, amines, and phenylbutazone) by Mn(VII) over a wide pH range of 4.0–9.0. The addition of substituents at para to the > N–O• moiety significantly influenced the degradation kinetics of TrOCs by changing the reduction potentials of TEMPOs and the corresponding oxoammonium cations (TEMPOs+); a linear relationship was observed between the substituents’ para Hammett sigma constants and the reduction potentials of TEMPOs and TEMPOs+. Pseudo-first-order reaction rate constants (kobs, min–1) of TrOC degradation by Mn(VII)/TEMPOs were also affected by the pKa of the TrOCs. Generally, the highest kobs values for individual TrOCs were observed at pH near the pKa even for TEMPOs+ with relatively pH-invariant reduction potentials. Overall, TrOC abatement kinetics were related to a combination of reactive species (Mn(VII), in situ formed MnO2, and TEMPOs+). For BPA, the relative contributions (R) of reactive species ranked as R(TEMPOs+) > R(Mn(VII)) > R(in situ formed MnO2) at pH 4.0–8.0, whereas R(Mn(VII)) > R(TEMPOs+) at pH 9.0 mainly owing to a change in BPA speciation as the pH approached the pKa1 value for BPA. The results of this study are useful for the development of heterogeneous TEMPO-based redox mediators and future applications of TEMPO-mediated oxidation systems for accelerated abatement of TrOCs in water.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yueqin Li,Qiang Gong,Lin Han,Xiaohui Liu,Yong Yang,Chen Chen,Changhao Qian,Qingshan Han
Engineering high mass electroactive materials into hydrogel scaffolds remains an enormous challenge in achieving flexible energy storage devices. Herein, carboxymethyl cellulose (CMC) assisted high mass polyaniline (PANI) into an interpenetrating double-network polyethyleneimine/polyacrylamide (PEI/PAAM) hydrogel was developed. With the optimum mass loading of PANI at 9.04 mg/cm 2 , the all-in-gel CMC-PANI 0.8M /PEI/PAAM supercapacitor can deliver a high specific capacitance of 679 mF/cm 2 , a maximum energy density of 58.82 μWh/cm 2 at a power density of 14.69 mW/cm 2 , and an enhanced capacitance retention of 98 % after 5000 cycles. Such device can withstand severely bending/compressing deformations and operate properly at extreme temperatures (−30–70 °C). The CMC-PANI 0.8M /PEI/PAAM hydrogel exhibits high sensitivity and stable electrical performance for wearable strain sensors. By connecting the supercapacitor with the strain sensor, the fabricated self-powered sensing system is capable of monitoring human activities accurately. Therefore, the multifunctional performance of the CMC-PANI 0.8M /PEI/PAAM hydrogel is competent in the field of flexible electronics.
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Biomolecules
·
2022
·Vol. 12
·期 8
·1089
·
IF 6.064
Liying Zhang,Gao He,Yang Yu,Yu Zhang,Xiang Li,Shige Wang
In recent years, multifunctional hydrogels have received a great deal of attention because they are biocompatible and can mimic the extracellular matrix. Herein, we prepared hydrogels of biocompatible cross-linked networks with photothermal properties. In this study, a chitosan/polyaniline/laponite (COL) hydrogel with photothermal conversion capability was designed. Polyaniline was firstly grafted onto chitosan and its solution was mixed with oxidized dextran, which was then cross-linked into a hydrogel via a Schiff base reaction. Furthermore, an aluminosilicate clay material, laponite (LAP), was incorporated into the hydrogel. The swelling ratio of the COL hydrogel in various solutions was greater than 580%, and it showed good degradation ability (the mass–loss ratio was over 45% after 28 days). This composite hydrogel was demonstrated to have good photothermal conversion properties and biocompatibility at both the cell (cell viability was over 97%) and animal levels. The COL hydrogel showed a photothermal conversion efficiency of 23.7% under the irradiation of a near-infrared laser. Coupled with the osteogenic differentiation-inducing potential of LAP, the COL hydrogel has the potential to kill tumors via hyperthermia or serve as scaffolds for bone tissue regeneration.Keywords:hydrogel;chitosan;polyaniline;photothermal;biocompatibility
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 35
·e52822
·
IF 3.057
Hejia Chang,Qinghu Meng,Defa Liu,Yue Wu,Zhizhou Yang,Bin Sun,Fang Liu,Yu Liu
Synthesis of hollow spherical polyaniline (HSPANI) with the merits of facile strategy, low cost, low safety risk and high adsorption capacity of Cr(VI) is always a big challenge. In this manuscript, we proposed a facile way to preparation of HSPANI by using the poly(styrene-co-acrylic acid) sphere as template. The results indicated that HSPANI was emeraldine comprised of lots of basically uniform hollow spheres, and its average pore diameter was about 300 nm. HSPANI displayed high adsorption capacity of Cr(VI), and its value arrived at 601.3, 347.8, 235 mg g −1 at pH = 1, 2, and 3, respectively, which were high than many other adsorbents. The endothermic, spontaneous and chemical adsorption process was responsible for this adsorption. The Cr(VI) adsorption capacity was significant relied on its pH, contact time, Cr(VI) concentration and adsorption temperature. The adsorption behavior was well agreed with pseudo second-order equation and Redlich–Peterson isotherm models. HSPANI exhibited remarkable selectivity for adsorption of Cr(VI) even if the K + , Cu 2+ , NO 3 − and SO 4 2− were coexisted. HSPANI also displayed excellent regeneration performance. Therefore, this work not only provided a facile way to synthesis of hollow spherical polyaniline, but also supplied a potential adsorbent for adsorption of Cr(VI) from the industrial wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Lichang Zhang,Kaiyun Wu,Yaxin Chen,Ren Liu,Jing Luo
A novel kind of graphene/polyaniline hybrid microcapsules loaded with self-healing agent (linseed oil, LO) were synthesized by Pickering emulsion template method in this work. In our strategy, graphene oxide (GO) was used as Pickering emulsifier to stabilize emulsion droplet containing aniline and linseed oil . After the polymerization of aniline, graphene/polyaniline microcapsules loaded with linseed oil (LO@GO/PANI) were prepared. By adjusting GO concentration and oil-water ratio, the size of the emulsion droplet and LO@GO/PANI microcapsule can be controlled at about 15–20 µm. The successful synthesis of LO@GO/PANI microcapsules was proved by SEM, FT-IR and TGA . The unique GO/PANI hybrid shell combined the outstanding barrier property of GO and anti-corrosion function of PANI. The solvent resistance results showed that the as-prepared microcapsules possessed stronger resistance to organic solvents . A smart coating with dual functions of anti-corrosion and self-healing was prepared by dispersing the as-prepared LO@GO/PANI microcapsule in waterborne epoxy resin . As the contents of microcapsules was 10 wt%, the scratch of the coating was completely healed after 12 h observed from the microscope images. The electrochemical impedance spectroscopy (EIS) and salt spray test all verified that the incorporation of microcapsules could significantly improve the anti-corrosion performance of the water-borne coatings. After 40 days' immersion, the low frequency modulus of the composite coating was almost 2 orders of magnitude higher than that of pure epoxy coating, and no obvious corrosion product was observed after 500 h salt spray test.
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ChemElectroChem
·
2022
·Vol. 9
·期 12
·e202200082
·
IF 4.782
Jian Liu,Xiaohang Ma,Zhenfa Zi
Graphical Flower power : Polyaniline nano-flowers doped with L-phenylalanine (PANI-NF) porous structures were prepared. The supercapacitor assembled with PANI-NF symmetrical electrode showed maximum specific capacitance of 580 F g −1 (I=0.5 A g −1 ), a maximum energy density of 53.9 Wh kg −1 , and excellent cycle stability at high current density. It made an LED work continuously for more than 600 seconds after charging for 10 seconds. In this work, three-dimensional (3D) nanostructures of polyaniline nano-sheets, nano-particles, nano-nets and nano-flowers were synthesized with valine, sulfuric acid, sodium acetate and L-phenylalanine as doping acids, respectively. Conductive polyaniline with 3D nanostructure was proven as an excellent energy storage material because of its superior electrical properties and unique structure. The porous structure not only greatly improved the charge transfer efficiency and reduced the resistance, but also improved the cycle stability and energy storage of the electrode material. Polyaniline nano-flowers doped with L-phenylalanine (PANI-NF) showed a maximum specific capacitance of 580 F g −1 (I=0.5 A g −1 ), a maximum energy density of 53.9 Wh kg −1 , and excellent cycle stability at high current density.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yingying Feng,Haiyan Li,Mingjun Zhang,Jiaying Jin,Beiyao Zhang,Yong Wang,Zhike Li
Benzotriazole-loaded polydopamine/polyaniline (BTA@PDA/PANI) microcapsules are prepared vis the combination of a hard template method and in-situ polymerization. The PDA/PANI hollow microspheres are first prepared using SiO 2 as a hard template and etching them with hydrofluoric acid . The BTA corrosion inhibitor is then loaded into the PDA/PANI hollow microspheres to obtain the BTA@PDA/PANI microcapsules. The mean particle size and shell thickness of the synthesized microcapsules are 8.3 and 2.1 µm, respectively. The load capacity of BTA is above 20 wt%. The corrosion resistance of epoxy coatings with different contents and types of microcapsules is compared by saline immersion and electrochemical impedance tests. A scratched coating with 1 wt% BTA@PDA/PANI microcapsules has the best anti-corrosion effect. The synergistic anticorrosion mechanism of BTA, PDA and PANI is revealed and confirmed.
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危险品化学品经营许可证（带存储）