JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Lechen Diao,Wei Zhou,Biao Zhang,Chunsheng Shi,Zhichao Miao,Jin Zhou,Chunnian He
Developing highly efficient, low-cost, and stable bifunctional oxygen electrocatalysts is essential for the wide popularization of rechargeable Zn-air batteries. Combining zero-dimensional metal nanoparticles with two-dimensional metal oxide nanosheets is an appealing strategy to balance performance and cost. However, the precise construction of these composites remains a great challenge, and their interaction mechanisms lack thorough study. Herein, a cobalt-oxide-based bifunctional oxygen electrocatalyst comprising a rich Co-CoO heterointerface (CoO/Co@NG) was synthesized via a NaCl sealing-assisted pyrolysis strategy. The NaCl crystals played the role of a closed nanoreactor , which facilitated the formation of a CoO-Co heterojunction . Experimental results and theoretical calculations confirmed that the ingeniously constructed heterojunction expedited the oxygen reduction reaction and oxygen evolution reaction kinetics, which is superior to Pt/C. When serving as the air electrode in an assembled liquid-state Zn-air battery , the battery shows high power density (215 mW cm −2 ), specific capacity (710 mAh g zn −1 ), and outstanding durability (720 h at 10 mA cm −2 ). This work provides an innovative avenue to design high-performance heterojunction electrocatalysts for perdurable Zn-air batteries.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Liting Wei,Haiying Yang,Jiao Jiao
In this study, polypyrrole functionalized graphene sheets (PPY-GNs) have been used for the first time as a reinforced material for the ultrasensitive detection of atorvastatin by the electrochemistry method. The obtained PPY-GNs were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Due toits porous structure, the PPY-GNs-modified electrode has a large effective area, thereby improving the sensitivity of detection. The peak currents of atorvastatin at the GNs-modified glassy carbon electrode (GNs/GCE) and those at the PPY-GNs/GCE are increased dramatically compared to those on the bare GCE. The peak current at the PPY– GNs/GCE linearly increases with the increase in the atorvastatin concentration, which ranges from 20μM to 200μM. The detection limit of atorvastatin reaches 1.191μM based on the signal-to-noise characteristic (S/N = 3). The PPY-GNs-based electrochemical sensor was successfully used to detect atorvastatin in tablets with satisfactory results.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Panpan Hao,Rufeng Zhu,Yang Tao,Wei Jiang,Xue Liu,Yan Tan,Yuedan Wang,Dong Wang
Novel enhancement-mode organic electrochemical transistors (OECTs) have been prepared by poly(3, 4-ethylenedioxythiophene)-poly(styrenesulfonate) de-doped polyethylenimine on the multi-walled carbon nanotube-modified viscose yarn. The fabricated devices exhibit low power consumption with a high transconductance of 6.7 mS, rapid response time < 2 s, and excellent cyclic stability. In addition, the device has washing durability and bending and long-term stability suitable for wearable applications. Biosensors based on enhancement-mode OECTs for the selective detection of adrenaline and uric acid (UA) are developed by using molecularly imprinted polymer (MIP)-functionalized gate electrodes. The detection limits of adrenaline and UA analysis are as low as 1 pM, with the linear ranges of 0.5 pM to 10 μM and 1 pM to 1 mM, respectively. Moreover, the sensor based on enhancement-mode transistors can efficiently amplify the current signals according to the modulation of the gate voltage. The MIP-modified biosensor has high selectivity in the presence of interferents and desirable reproducibility. Additionally, due to the wearable nature of the developed biosensor, this sensing tool has the capability of being integrated with fabrics. Therefore, it has successfully been applied in textiles for the determination of adrenaline and UA in artificial urine samples. The excellent recoveries and rsds are 90.22–109.05% and 3.97–6.94%, respectively. Ultimately, these sensitive, low-power, wearable, and dual-analyte sensors help to develop non-laboratory tools for early disease diagnosis and clinical research.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Aming Xie,Daohu Sheng,Wenli Liu,Youjian Chen,Siyao Cheng
Transition metal molybdate ( R MoO 4 ) has been extensively studied in optics, electricity and catalysis due to its low cost and multivalent Mo atoms, while its poor electrical conductivity limits its application in electromagnetic wave absorption (EMA). Compounding molybdate with conductive materials is an effective way to improve its electrical conductivity. In this work, a homogeneous coating on the molybdate surface was achieved by utilizing a pyrrole oxidation polymerization mechanism, and then stabilized composites of Molybdate@Carbon ( R MoO 4 @C) were obtained by high-temperature pyrolysis. The EMA properties of the nanocomposites were tuned by substituting the species of transition metal elements ( R MoO 4 @C, R =Fe, Co, Cu). Among them, Fe 2 (MoO 4 ) 3 @C has a minimum reflection loss of −60.62 dB at an ultra-low thickness of 1.7 mm, and the effective absorption bandwidth (EAB) can reach 4.75 GHz at 3.00 mm. This work expands the range of applications for molybdate and provides a new material basis for building high-performance EMA materials.
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Small
·
2023
·Vol. 19
·期 38
·2303321
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IF 13.3
Qi Li,Liangmei Luo,Chenqi Xu,Shizhu Song,Yanqing Wang,Lifang Zhang,Yanfeng Tang,John Texter
Metal–nitrogen–carbon (M–C/N) electrocatalysts have been shown to have satisfactory catalytic activity and long-term durability for the oxygen reduction reaction (ORR). Here, a strategy to prepare a new electrocatalyst (Fe&Pd–C/N) using a unique metal-containing ionic liquid (IL) is exploited, in which Fe & Pd ions are positively charged species atomically dispersed by coordination to the N of the N-doped C substrate, C/N. X-ray absorption fine structure, XPS and aberration-corrected transmission electron microscopy results verified a well-defined dual-atom configuration comprising Fe +2.x –N 4 coupled Pd 2+ –N 4 sites and well-defined spatial distribution. Electronic control of a coupled Fe–Pd structure produces an electrocatalyst that exhibits superior performance with enhanced activity and durability for the ORR compared to that of commercial Pt/C (20%, Johnson Matthey) in both alkaline and acid media. Density functional theory calculations indicate that Pd atom can enhance the catalytic activity of the Fe active sites adjacent to Pd sites by changing the electronic orbital structure and Bader charge of the Fe centers. The excellent catalytic performance of the Fe&Pd–C/N electrocatalyst is demonstrated in zinc–air batteries and hydrogen–air fuel cells.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yanxia Li,Yang Peng,Jia-Yue Tian,Shuxia Duan,Yingkun Fu,Shuai Zhang,Miao Du
Conductive hydrogels with intrinsic flexibility, high sensitivity, antibacterial activity , and repeatability are used in wearable devices . The development of conductive hydrogels with simultaneously high conductivity, reliability, and controllable degradability remains a challenge. Therefore, conductive composite hydrogel polyvinyl alcohol (PVA)-stabilized eutectic gallium and indium (EGaIn)/polyacrylamide (PAAm)/polyacrylic acid (PAA)@FeCl 3 @polyprrole (PPy) (PVA-EGaIn-x@PAAm/PAA@FeCl 3 @PPy, where x represents EGaIn content) was employed to fabricate a multi-cross-linked network and interpenetrating hydrogel with high conductivity, mechanical properties , and controllable degradability. Ga 3+ /Fe 3+ –carboxyl group coordination bonds can act as a dynamic cross-linking network to promote controllable degradability. Meanwhile, EGaIn liquid metal and PPy, as electronic conductors, conferred the composite hydrogel with good conductivity. The effects of EGaIn liquid metal content on mechanical properties and conductivity were investigated in detail. A simple strain sensor fabricated by using PVA-EGaIn-5@PAAm/PAA@FeCl 3 @PPy achieved the detection of the current signal of human motions. The conductive composite hydrogel had good conductivity (8.1 S m −1 ), acceptable sensitivity (gauge factor of 0.28), and reliability (500 cycles at 200% strain). Furthermore, the prepared composite can be degraded in acid and base solutions for environmental preservation. This work provides a feasible method for the construction of multifunctional robust hydrogel strain sensors to facilitate the practical development of sensors for monitoring human motions.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yikun Yi,Feng Hai,Xiaolu Tian,Zhendi Wu,Shentuo Zheng,Jingyu Guo,Wenting Chen,Weibo Hua,Long Qu,Mingtao Li
Sulfur polymers achieve a favorable stabilization of short-chain sulfurs for solid-phase conversion, but still suffer from the sluggish kinetics and ambiguous structural mechanisms. Herein, a typical conductive dopant polypyrrole (PPy) with ordered chain structure and exceptional electrical conductivity is novelly proposed to covalently bond short sulfur chains after the sulfurization at above 300 °C. Upon temperature regulation, the sulfurized polypyrrole (SPPy320V) cathode exhibits superior cycling stability at various current densities with decent reversible capacities. Even at a high rate of 2 C, an initial capacity of 803 mAh g −1 and a decay of as low as 0.022% per cycle during 700 cycles are presented. Theoretically, the existing form of sulfur chains and molecular structure are rationally proposed according to spectroscopy measurements and DFT calculations, as well as the semi-situ detections reveal the conversion mechanism of sulfur species. This systematic study provides an effective guide to the subsequent development of cathodic structure for Li-S batteries based on solid-phase conversion.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xie Fu,Hui Tong,Yutong Wu,Kun Zhang,Xiong Sheng,Lyes Douadji,Guotian He,Zicheng Qiu,Baoping Zhou,Shuai Kang,Jinling Luo,Ziwei Pan,Wenqiang Lu
Flexible wearable sensors with high sensitivity, broad sensing range, and low detection accuracy have great potential applications in human motion online monitoring, human healthcare detection, and human–machine interface. However, high sensitivity and broad sensing range conflict, as the former requires conspicuous structural changes under microstrain while the latter requires complete morphology under large deformation. Herein, we report few-layer 2D Ti3C2Fx and 1D polypyrrole (PPy) nanowires with a sandwich stack structure transfer on polyacrylic acid (PAA) tape based on layer-by-layer (LBL) assemble technology. The 1D PPy nanowires enhance the strain sensor’s interfacial adhesion and electron transmission channel, resulting in high sensitivity and a permissible detection range (0–50%). Under various applied force stimuli, the synergetic effect of Ti3C2Fx nanosheets (4.72 nm thickness) and PPy nanowires (diameter 20–50 nm) endows the stack structure with good electrical–mechanical performance, which is reflected by the sensor’s high sensitivity (GF = 2950, ε = 50%; GF = 475, ε = 10%; GF = 22, ε = 0.1%). Such a flexible sensor with a permissible detection range (up to 50%), a low detection limit (0.1%), and reliable repeatability (>1500 cycles) has potential applications for human motion detection, clinical diagnosis, and healthcare monitoring.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Ying Zhang,Weijun Peng,Yijun Cao,Wei Wang,Daoguang Teng,Yukun Huang,Guixia Fan
The application of 3D printing technology in the field of energy storage is of great practical significance but still remains challenging. Recently, 3D-printed graphene-based architecture has been found to be a promising material for electrochemical energy storage devices. In this study, graphene-based conductive filaments were printed through direct ink writing method (DIW), and then dense poly-pyrrole film (PPy) was formed on the surface of the 3D frame by simple electrodeposition . And followed by post treatment three-dimensional heterogeneous graphene-based electrodes wrapped by nanocarbon cloth (3DCGs) were readily prepared. 3D-printed open porous structure provides effective aligned channels for ion transport as well as large ion accessible area for electrochemical reaction . PPy layer helps to maintain the structural integrity and obtain high capacitance retention rate. A series of 3DCGs with controllable channels were prepared by adjusting the number printing layers, infilled spacing and nozzle size. Thus, we gained an insight into the influence of structural engineering of electrode materials on electrochemical performance . The 5-layer 3DCG with filament spacing of 300 µm and filament diameter of 400 µm achieved an areal capacitance of 2265.19 mF/cm 2 at a scan rate of 5 mV/s, which was significantly higher than that of non-3DCG (400.15 mF/cm 2 ). Briefly, this study reports the integration of DIW 3D-printing and electrodeposition techniques allowing a facile way of fabricating customized 3D-electrodes with large areal capacitance.
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Polymers
·
2023
·Vol. 15
·期 13
·2918
·
IF 5
Cheng Tang,Tao Hu,Chengzhen Du,Ziqin Liao,Wenyan Cheng,Fen Wang,Xiaoli Hu,Kunpeng Song
A Fe-N conjugated organic polymer (SMP-Fr-Py) was prepared from ferrocene and pyrrole using a Scholl coupling reaction, which significantly improved the performance of Cr(VI) removal compared to the polymer (HCP-Fr-Py) prepared by adding the cross-linker formaldehyde dimethyl acetal (FDA). The results showed that at a pH of 2 and at 25 °C, the removal of Cr(VI) reached 90% for SMP-Fr-Py and only 58% for HCP-Fr-Py after 20 min of reaction. Subsequently, 99% and 78% were achieved after 120 min of reaction, respectively. The test results showed that the removal reaction followed a pseudo-second-order kinetic model. The removal efficiency decreased with increasing solution pH and initial Cr(VI) concentration, but increased with increasing SMP-Fr-Py dosage, reaching three cycles. The characterization of the reaction complexes and measurements of Cr species conversion revealed the near absence of Cr(VI) species in the solution. Approximately 38% of Cr(VI) was found to be adsorbed on the material surface, with another fraction present in solution (24%) and on the material surface (38%) in the form of Cr(III). The overall study showed that the direct connection of ferrocene and pyrrole in SMP-Fr-Py through C-C bonding increased the conjugated structure of the polymer backbone, which facilitated electron transfer and transport. Furthermore, the Fe-N elements worked synergistically with each other more easily, which improved the removal performance of Cr(VI) and provided a reference for the subsequent work.Keywords:organic polymers;Fe-N co-doping;Cr(VI) removal;conjugate structure
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Polymers
·
2023
·Vol. 15
·期 12
·2735
·
IF 5
Qizhong Xiong,Lei Zhang,Zijun Zhu,Gang Xu,Jianyuan Jing,Weifeng Zhang,Chaochun Zhang,Xinxin Ye
Cellulose, a kind of polymer containing abundant functional groups, has widespread use in the adsorptive removal of environmental pollutants. An efficient and environmental friendly polypyrrole (PPy) coating approach is employed to modify the agricultural by-product straw derived cellulose nanocrystal (CNC) into excellent property adsorbents for removing the heavy metal ion of Hg(II). The FT-IR and SEM-EDS results demonstrated that PPy is formed on the surface of CNC. Consequently, the adsorption measurements proved that the obtained PPy-modified CNC (CNC@PPy) possesses a remarkably enhanced Hg(II) adsorption capacity of 1095 mg g−1, owing to a plentiful functional group of doped Cl element on the surface of CNC@PPy by forming Hg2Cl2precipitate. The results of the study suggest that the Freundlich model is more effective than the Langmuir model at describing the isotherms, while the pseudo-second order kinetic model is better suited to correlating with the experimental data compared to the pseudo-first order model. Further, the CNC@PPy exhibits an outstanding reusability, capable of maintaining 82.3% of its original Hg(II) adsorption capacity after five successive adsorption cycles. The findings of this work reveal a method to convert the agricultural by-product into high performance environmental remediation materials.Keywords:CNC;CNC@PPy;Hg(II) adsorption;agricultural waste
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CELLULOSE
·
2023
·Vol. 30
·期 10
·6507-6521
·
IF 5.7
Fan Lingling,Zheng Wenfeng,Yang Yuan,Sun Yan,Peng Songlin,Xu Jie,Yin Guangfu
Bacterial cellulose (BC)/polypyrrole (PPy) nanofibrous composites have been extensively studied in supercapacitors owing to their large specific surface area and excellent tensile strength. However, the inferior cycling stability due to structural pulverization of PPy impedes their potential applications. Herein, nanofibrous composite membranes of MXene, PPy and oxidized BC (TOBC) were prepared for flexible supercapacitor electrodes. The C6 primary hydroxyl groups of BC nanofibers were oxidized into aldehyde or carboxyl groups. Due to the enhanced interaction of TOBC with PPy and MXene, the TOBC nanofibers were horizontally wrapped on the MXene nanosheets and PPy was homogeneously deposited on the TOBC nanofibers. The flexible solid-state supercapacitors fabricated with the MXene@TOBC@PPy (TMP) electrodes achieved an areal specific capacitance of 928.9 mF cm −2 at 0.7 mA cm −2 and a capacitance retention of 85.5% after 5000 cycles. Therefore, the TMP electrodes could be a promising electrode material for flexible supercapacitors.
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