MACROMOLECULAR CHEMISTRY AND PHYSICS
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2022
·Vol. 223
·期 18
·2200074
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IF 2.996
Xiaoling Chen,Caixin Shi,Tian Wang,Guanhua Wang,Yansheng Zhao,Yongmei Liu,Ding Zhang
Flexible electronics have achieved development with the rising consumption of wearable devices. In this work, a novel polyacrylamide-graphene oxide-polyaniline composite hydrogel (PGPH) based flexible electrode with good mechanical and electrochemical properties is prepared. The polyacrylamide interpenetrating network can provide a porous substrate. The strong π – π interaction between graphene oxide and polyaniline can stabilize polyaniline. The area-specific capacitance of PGPH is 100.57 mF cm –2 at a current density of 5 mA cm –2 , and the capacity remains at 75.54% after 1000 cycles. One layer of sodium alginate is spin-coated on top of the electrode to solve the problem of desorption of conductive materials and improve the cycle stability of the materials. The PGPH exhibits a conductivity of 5.11 S m –1 and elongation at break of 352%, which is significantly higher than that of common polyacrylamide-polyaniline hydrogel. Based on the good mechanical and electrochemical properties of PGPH, it has broad application prospects in flexible energy storage devices and flexible sensors.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Hang Yu,Dewang Li,Huayu Bao,Zhenhu Zhang,Hongli Liu,Fei Zhang,Shirong Wang
The efficiency and long-term stability of perovskite solar cells are severely limited by the challenges of the surface defects and the perovskite degradation caused by moisture and Li+ diffusions. To overcome these disadvantages, a multifunctional cross-linked interfacial layer of poly(V-TPAFDPA-co-PETMP) by copolymerization of V-TPAFDPA and PETMP is introduced between the Cs0.05(FA0.83MA0.17)0.95Pb(Br0.17I0.83)3 perovskite and the hole transport layer (HTL). The unique cross-linked structure incorporates the highly conjugated units from V-TPAFDPA benefiting hole extraction and moisture prevention, as well as the −S– and C═O groups from PETMP for surface defect passivation. Moreover, the cross-linked network shows improved stability against the subsequent solvent treatment for HTL preparation and Li+ penetration. An ameliorated power conversion efficiency from 20.18 to 21.19% is achieved with the cross-linked interlayer, and the long-term stability under moisture, illumination, or elevated temperature is also improved, which highlights our effective design on the multirole cross-linked interfacial materials.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Hao Wang,Hui Yun,Minghan Li,Hanlin Cui,Xiaodan Ma,Yanqing Zhang,Xuanyuan Pei,Liying Zhang,Ke Shi,Zhiling Li,Bin Liang,Aijie Wang,Jizhong Zhou
Triclocarban (TCC), one of the typical antimicrobial agents, is a contaminant of emerging concern commonly found in high concentration in water environments. However, the fate and toxicity of TCC in wastewater treatment systems remain poorly understood. Here, we investigated how TCC impacts chemical oxygen demand and inorganic nitrogen transformation in a hydrolytic anaerobic-anoxic/oxic process. In the anaerobic section, the transformation of TCC was dominated by reductive dechlorination and supplemented by two amid bonds hydrolysis. In the anoxic and oxic sections, the hydrolysis of amid bonds dominated. The toxicity was reduced after the treatment (IC 50 from 0.09 to 0.54). TCC inhibited NH 4 + -N removal in the anaerobic section and led to the NO 3 - -N accumulation (2.84–4.13 mg/L) after treatment, with the abundance of N-removal bacteria decreased by 6%. Furthermore, the original ecological niche was gradually replaced by TCC-resistant/degradative bacteria, formating new microbial modules to resist the TCC stress. Importantly, fourteen genera including Methanosaeta , Longilinea , Dokdonella and Mycobacterium as potential bioindicators warning TCC and its intermediates were proposed. Overall, this study provides new insights into the fate of TCC in biological wastewater treatment systems and suggests a great importance for TCC control to ensure the health and resilience of ecosystems.
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PubMed
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 23
·2200562
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IF 5.006
Jie Mao,Tong Wu,Zhenbin Tang,Long Xia,Liu He,Birong Zeng,Yiting Xu,Conghui Yuan,Lizong Dai
The underlying trend of colloidal synthesis has focused on extending the structure and composition complexity of colloidal particles. Hollow and yolk–shell particles are successful examples that have potential applications in frontier fields. In this paper, a facile and controllable etching method based on the molecular exchange of the dynamic imine bond to generate cavities in polymer particles is developed. Starting from boronate ester polymer particles and inorganic@boronate core–shell particles with the imine bonds incorporated in the polymer networks, the etching method easily affords hollow and yolk–shell particles with tunable shell thicknesses. The molecular exchange dynamics analysis indicates that guest amine molecules cause the reconstruction of imine bonds and the leakage of molecular and oligomer fragments, resulting in the formation of the hollow structure. This molecular exchange-based etching method may be of interest in the construction of polymer architectures with increased composition and structure complexities.
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PubMed
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 26
·期 11
·2435-2443
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IF 2.747
Jiang Demin,Zhu Chenyi,He Yuan,Xing ChengCheng,Xie Kun,Xu Yan,Wang Yuqiao
Anodes play an important role in the extracellular electron transfer (EET) process in microbial fuel cells (MFCs). Herein, polyaniline modified multilayer MXene (PANI-MXene) on carbon cloth was used as an anode to improve the EET efficiency. The PANI-MXene was formed by the electrostatic interaction between the negatively charged groups of MXene and the positively charged protonated amino groups of PANI to enhance the bacterial adhesion and biofilm formation. The MFCs obtained a high maximum power density (737.3 mW·m -2 ) with the efficient EET process. This work provides a meaningful way to decorate anodes using binder-free modifiers for MFCs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Junlu Bi,Xuejun Zhai,Guishan Liu,Jing-Qi Chi,Xuanyi Wang,Shaojin Chen,Zhenyu Xiao,Lei Wang
Searching for highly efficient and Pt-free electrocatalysts with comparable hydrogen evolution reaction (HER) activities to the benchmark Pt/C catalyst is highly demanded for developing renewable water electrolysis system but still remains challenging. In the current work, low loading of P modified ultrafine Rh nanoparticles encapsulated in N, P dual-doped carbon layers (Rh–P@NPC) have been prepared through a facile polymerization-impregnation followed by high-temperature pyrolysis process . Benefiting from the unique core-shell structural advantages and synergistic effect of Rh–P and NPC components, the resulting Rh–P@NPC catalyst not only exhibits remarkable electrocatalytic activity for HER in the whole pH range with a low overpotential of 31 mV, 65 mV, and 130 mV to drive a current density of 10 mA cm −2 in 0.5 M H 2 SO 4 , 1.0 M KOH, and 1.0 M PBS , respectively, but also demonstrates high durability. It is worth to note that all these HER performances are on a par with commercial Pt/C catalysts for HER. This synthetic strategy provides possibility for the fabrication of carbon-based heterostructures with high catalytic activity and durability in harsh environments.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 12
·120542
·
IF 4.316
Ke Qu,Yuqi Bai,Miao Deng
The ever-increasing need for small and lightweight power sources for use in portable or wearable electronic devices has spurred the development of supercapacitors as a promising energy storage and conversion system. In this work, a simple, facile and easy-to-practice method has been developed to employ carbon paper (CP) as the support to coat molybdenum disulfide (MoS2) and graphene oxide (GO), followed by electrodeposition of polyaniline (PANI) to render CP/MoS2-GO-PANI. The preparation parameters, such as amounts of MoS2, GO and number of aniline electropolymerization cycles, have been optimized to render CP/MoS2-GO-PANI the best capacitive performance. The as-prepared optimal CP/MoS2-GO-PANI is characterized by X-ray powder diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The supercapacitive properties of CP/MoS2-GO-PANI as an electrode have been evaluated electrochemically via cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy testing. CP/MoS2-GO-PANI delivers a specific capacitance of 255.1 F g−1 at 1.0 A g−1 and exhibits excellent rate capability under larger current densities. Moreover, a symmetrical supercapacitor is assembled and three are connected in series to power a light-emitting diode for ∼15 min, demonstrating the promising application potential of CP/MoS2-GO-PANI-based supercapacitor.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xi Zheng,Tianyuan Xu,Xueyan Kang,Yaowen Xing,Yijun Cao,Xiahui Gui
Coke powder (CP), the by-product of coal carbonization, its activity of persulfate (PS) activation was systematically investigated. Structural dependent organic pollutant degradation performances and the related mechanisms were discussed in detail. The structural characteristics of CP were studied using X-ray diffraction, Raman, Fourier transform infrared spectra, X-ray photoelectron spectra, and electron paramagnetic resonance (EPR) etc. Characterization results indicate that CP contains ∼ 78% carbon and presents highly disordered amorphous structures with abundant oxygenated functional groups (OFGs) and persistent free radicals (PRFs). The catalytic application reveals that CP held excellent activity for PS activation across a wide pH range from 3 − 11. In the presence of 0.5 g/L CP, 0.25 mM PS and 0.021 mM aniline (pH 7 ± 0.2), >99% aniline was degraded within 40 min. Under the interference of inorganic anions (Cl − , HCO 3 − and SO 4 2− ), 98% aniline degradation efficiency still could be achieved. Meanwhile, quenching tests and EPR demonstrated that the superoxide anion radical (O 2 − ) was responsible for aniline degradation in CP/PS system, and its generation was independent of dissolved oxygen. The outstanding performance of aniline degradation and ROS generation were attributed to the existence of PRFs, sp 2 -hybridized carbon, OFGs and defects on CP inducing O–O bonding homolytic cleavage of PS into sulfate radicals. Besides, the OFGs including C–OH and –COOH as electron donors facilitated PS decomposition to generate O 2 − . The findings imply that CP is an excellent PS activator, and clarify the development of remediation materials by using by-products of coking process for wastewater treatment.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2021
·
IF 6.064
Hao Liu,Baomin Fan,Zining Liu,Xiaoqi Zhao,Biao Yang,Xingwen Zheng,Hua Hao
Polyaniline (PANI), poly( N -methylaniline) (PNMA) and poly( N- formylanilide) (PNFA) coatings were fabricated over mild steel via chronoamperometric strategy in oxalate electrolyte. Scanning electron microscope (SEM), attenuated total reflection infrared spectroscopy (ATR-IR) and X-ray photoelectron spectroscopy (XPS) evidenced the polymerization of monomers . Anticorrosive effects of PANI, PNMA and PNFA coatings for steel substrate were evaluated during long-term immersion in 3.5% NaCl solution by potentiodynamic polarization , electrochemical impedance spectroscopy (EIS) and frequency modulation (EFM). Morphological variation for coated specimens before and after immersion in NaCl solution was also monitored by SEM and atomic force microscope (AFM). Differentiated protection capability were observed for three coatings following the sequence of PNFA > PNMA > PANI. Through electrochemical and interfacial analyses, electroactivity and physical barrier were ascertained as the critical factors, especially the former one, in the long-term protection capacity. Electroactivity was distinguished by the elevated apparent current density from non-destructive EFM measurements. Furthermore, electron-donation and -withdrawal effects of N -substituents played an essential role in coating electroactivity. In detail, N -substituents improved the anodic protection and physical barrier of PNMA and PNFA coatings. Particularly, formyl with electron-withdrawal effect reinforced the anodic protection and thus the superior the anticorrosion efficiency of PNFA for underlying steel.
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PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Yue Sun,Cheng Li,Dengyu Fu,Haodong Hu,Ziheng Bai,Haolei Geng,Yueyang Gao,Yanji Zhu,Huaiyuan Wang
Reasonable design, preparation and application of highly effective fillers are the main challenges to significantly improve the protective performance of coatings. Herein, based on the EP coating, polyfluoroaniline@sodium dodecyl benzenesulfonate‑cerium dioxide-montmorillonite (FA@SD-CeO 2 -MMT) filler was elaborately designed. Due to the integral anti-corrosion system, the impedance value of FA@SD-CeO 2 -MMT/EP remained 1.02 × 10 11 Ω cm 2 after 90 d immersion of 3.5% NaCl. And the multi-interactions among MMT, FA@SD and CeO 2 form a trinity anti-corrosion system of passivation, hydrophobic shielding and cathodic protection , which significantly improve the anti-corrosion performance of EP coatings.
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Analytical Methods
·
2021
·Vol. 13
·期 43
·5231-5239
·
IF 2.896
Xuejia Chen,Tingkai Xiong,Jin Xu,Yan Li,Min Zhang,Ying Liang
In this paper, a novel and stable fluorescent reagent, quinoline-2,3-dicarbaldehyde (QDA), is synthesized as a probe to detect ammonium in natural water. Ammonium reacts with QDA in the presence of SO32− and Ca2+ to form a fluorescence product, which has maximum excitation and emission wavelengths at 429 nm and 518 nm. The concentration of reagents, the reaction temperature, the reaction time, and the pH in the final solution are investigated and optimized. The interferences of typical organic nitrogen and inorganic compounds are evaluated, and results prove that most volatile amines have little or negligible effect. Under the optimized conditions, this method provides a limit of detection of 0.065 μmol L−1, a calibration range of 0.216–9 μmol L−1, and reproducibility (with a relative standard deviation) of 1.9% for 1.5 μmol L−1 ammonium. For water sample analysis, the proposed method provides comparable results to those of the conventional o-phthalaldehyde method but has longer reagent stability (42 days).
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Xiang Luo,Haifeng Li,Dongdong Deng,Lu Zheng,Yubo Wu,Wenjun Luo,Meijie Zhang,Rongzhou Gong
Fe 3 O 4 , as a typical absorber, its electromagnetic wave (EMW) absorption properties are far from meeting the requirements of practical application due to its poor impedance matching. In this study, three kinds of novel heterogeneous structured composites, dendritic Fe 3 O 4 @(HCl doped PANI), Fe 3 O 4 @(p-TSA doped PANI) and Fe 3 O 4 @(dedoped PANI), were prepared via hydrothermal method combined with thermal reduction and in-situ polymerization, and their phase composition, microscopic morphologies, static magnetic properties , EMW absorption performance and absorption mechanisms were investigated. The results showed that the introduction of different medium doped and dedoped PANI greatly enhanced the EMW absorption performance of Fe 3 O 4 . The outstanding advantages of Fe 3 O 4 @(HCl doped PANI) were that the widest effective absorption bandwidth ( EAB ) up to 6.08 GHz in a relatively thin thickness of 2.1 mm. And the Fe 3 O 4 @(dedoped PANI) composite achieved strong absorption ability (− 53.08 dB@3.04 GHz) at low frequency in a relatively thin thickness (4.9 mm). The remarkable improvement of EMW absorption performance of dendritic Fe 3 O 4 @PANI composites could be attributed to the introduction of dissipation mechanisms, the optimization of impedance matching characteristics and the formation of appropriate conductive network microstructure. The dendritic Fe 3 O 4 @PANI composites are promising EMW absorption materials and have great practical application value.
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