INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Peng Lv,Lingxia Song,Yue Li,Hao Pang,Weiqu Liu
The rapid development of the portable and wearable devices has inspired the ever-growing pursuit of flexible energy storage equipment which can power these devices. Here, rice paper (RP) was integrated with a homemade LGS-polypyrrole (LGS-PPy) ink and commercial pen ink in order to construct a flexible electrode of a supercapacitor via a facial dip-coating method. The obtained RP/LGS-PPy ink/Pen ink composites showed a high areal specific capacitance of 1568 mF/cm 2 at 0.2 mA/cm 2 , owing to the uniform deposition of a LGS-PPy layer which was covered by the pen ink coating. Furthermore, the assembled symmetric supercapacitor fabricated from the RP/LGS-PPy ink/Pen ink electrode exhibited impressive electrochemical performances in terms of specific capacitance (317.5 mF/cm 2 at 2 mA/cm 2 ), power density (846 μW/cm 2 at the energy density of 23.5 μWh/cm 2 ), and life times (82.1% capacitance retention after 5000 cycles). In addition, the capacitance of the as-prepared device remained essentially unchanged even after bending at 180°, thus demonstrating this device's outstanding flexibility. The low cost of raw materials, robust fabrication strategy as well as the moderate performances make the RP-based supercapacitor a promising candidate for future flexible energy storage devices.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·7122-7128
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IF 12.732
Yukun Sun,Xupeng Zong,Dan Qu,Ge Chen,Li An,Xiayan Wang,Zaicheng Sun
Solar water evaporation is a sustainable and efficient way to produce fresh water. Identifying highly efficient photothermal materials is an important step for achieving high evaporation rates. However, the effects of the water interfacial area are rarely paid any attention, although a few reports have demonstrated high evaporation rates from micro-/nanostructured devices. In this work, we introduce a new term, water mass per unit surface area (WMUA), to connect the water mass and interfacial area. We can regulate WMUA using different commercial porous materials to realize water management in devices, which further affects the evaporation rates. The optimized device is composed of suedette sponge, filter paper, and polydopamine as the water-transportation, water-restrictive, and photothermal materials, respectively, and it achieves an evaporation rate of 1.8 kg m−2 h−1 and energy efficiency of ∼92%. This presents a new strategy for the rational design of device structures and the promotion of evaporation rates, pushing this field into new areas.
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高影响因子
Journal of CO2 Utilization
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2021
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IF 7.132
Yue Zhang,Lin Liu,Wei-Guo Xu,Zheng-Bo Han
A bifunctional MOF@POP core-shell catalyst (NH 2 -UiO-66(Hf)@CoTPy-CAP) constructed by amino functionalized NH 2 -UiO-66(Hf) and ionic porphyrin-based CoTPy-CAP was first reported to be applied in the cycloaddition of CO 2 . Because NH 2 -UiO-66(Hf)@CoTPy-CAP both possess abundant Lewis acidic sites and nucleophilic centers in one system, the catalyst can efficiently catalyze CO 2 fixation with epoxides without homogeneous cocalyst under mild conditions, achieving propylene oxide (PO) conversion of 98 % at 80 °C and 0.5 MPa. Furthermore, the bifunctional synergetic catalyst was easy to be recovered and recycled for five runs, and the reduction of activity was not obvious. This present work provides a viable direction for the fabrication of bifunctional synergetic catalysts for high-efficient CO 2 fixation without cocatalyst under mild conditions.
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高影响因子
CHIRALITY
·
2021
·Vol. 33
·期 4
·176-183
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IF 2.437
Ling Gong,Shan Li,Zhengzhi Yin,Kelin Li,Jiawei Gu,Datong Wu,Yong Kong
Poly( p -aminobenzene sulfonic acid) (pABSA) was electrodeposited onto the surface of a glassy carbon electrode (GCE), which was then used for the preconcentration of l -tryptophan ( l -Trp) due to the electrostatic and π–π interactions between pABSA and l -Trp. Polypyrrole (PPy) was electrodeposited onto the surface of the l -Trp enriched pABSA, and then the l -Trp templates were removed, resulting in molecularly imprinted PPy/pABSA. To avoid the interference from the oxidation peak of PPy on the following electrochemical chiral recognition of Trp isomers, PPy was overoxidized by cyclic voltammetry (CV). The resultant molecularly imprinted overoxidized PPy (OPPy)/pABSA modified GCE exhibits higher affinity toward l -Trp than d -tryptophan ( d -Trp); that is, the oxidation peak current of l -Trp is greatly higher than that of d -Trp at the molecularly imprinted OPPy/pABSA modified GCE.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Wei Yang,Chenyuan Weng,Xiaoyun Li,Hongliang He,Jianwen Fei,Wei Xu,Xiaoqiang Yan,Wanying Zhu,Hongsong Zhang,Xuemin Zhou
At present, artificial mimic enzyme has become a powerful substitute for natural enzyme. In particular, the biosensors based on nano-enzymes have been the focus of current research. Herein, a novel magnetic ternary nanocomposite hemin-Fe 3 O 4 @polypyrrole (h-Fe 3 O 4 @ppy) was synthesized by chemical oxidation polymerization. The results showed that the h-Fe 3 O 4 @ppy had stronger peroxidase activity than Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) and h-ppy NPs, and was indicated by Michaelis-Menten constant (K m ) and maximum initial velocity (V max ). Therefore, we used h-Fe 3 O 4 @ppy catalyzing H 2 O 2 to oxidize the chromogenic substrate TMB, and built Hydrogen peroxide (H 2 O 2 ) and Glutathione (GSH) colorimetric biosensors with the help of signal intrinsic exponential amplification and easy operation. The controllable catalysis was realized by h-Fe 3 O 4 @ppy which was prone to separation. The method of removing h-Fe 3 O 4 @ppy by magnetic separation effectively eliminated the effect of residual catalysis when terminating the reaction. The sensor was then applied to the determination of GSH in biological samples from acute coronary syndrome patients. The linear ranges of H 2 O 2 and GSH were 0.2–100 μM and 0.5–80 μM, respectively. The detection limits of H 2 O 2 and GSH are 0.18 μM and 0.15 μM, respectively. This research not only proposes a new type of nanoenzyme, but also shows the multiple advantages of magnetic nano-enzymes for the construction of biosensors.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 6
·3078-3083
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IF 1.938
Wu Wanyi,Wang Mengkun,Huang Huihui,Gu Wenxian,Yan Chengzhan,Chen Guang,Yin Dewu,Jin Huile,Wang Jichang,Wang Shun
In this work, hierarchically porous carbon spheres co-doped by iron and nitrogen were synthesized via in situ dehalogenation. The rich porous structure and relatively high specific surface area (210 m 2 /g) facilitate the formation of an ultra-fine Fe 2 N active phase and FeN 4 active centers within the carbon matrix. Transmission electron microscopy and X-ray photoelectron spectroscopy analysis further reveal the presence of a dominant Fe 2 N phase and minor FeN 4 bonds in the as-prepared Fe-N-C-pd-800 samples. Because of this, the oxygen reduction reaction (ORR) process can more readily take place on Fe 2 N than on FeN 4 , and the Fe 2 N phase enriched Fe-N-C-pd-800 carbon spheres exhibit a promising onset potential ( E onset =1.02 V) and half-wave potential ( E 1/2 =0.86 V) in alkaline media. In addition, Fe-N-C-pd-800 also shows excellent methanol resistance and long-cycling stability.
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高影响因子
Nano Energy
·
2021
·
IF 17.881
Yan Zheng,Tong Lin,Ning Zhao,Caixiu Huang,Wei Chen,Gi Xue,Yong Wang,Chao Teng,Xiaoliang Wang,Dongshan Zhou
Due to its unique advantages, capacitive electronic skin (E-skin) has shown excellent application potential in robotics, human-computer interaction, and biomedical equipment in recent years. However, the low sensitivity and nonlinear response caused by the classic working mechanism of compressing the microstructured elastic dielectric layer and the low dielectric constant of the elastomer limit practical applications of E-skin. To make the device respond linearly to pressure over a wide range, a new strategy of controlling the contact area between the elastic electrode and the dielectric layer is adopted. This design also reduces signal distortion, which originates from the viscoelasticity of the polymer. Furthermore, by using ferroelectric polymers and ionic gels with high capacitance in the dielectric layer, the sensitivity of the device can be adjusted in the range of 0.644–26.6 kPa −1 , and the lower limit of pressure detection is as low as 2.88 Pa. The performance of the device remains stable even after 8000 cycles of compression. On this basis, the successful application of the linear-response E-skin obtained in this work in physiological signal monitoring and the collection of basic object information, such as shape and hardness, proves the rationality of the design and provides the possibility for capacitive electronic skin to move towards real life applications.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Lingfeng Yan,Weiya Li,Qiangqiang Zhao,Zhijia Zhu,Chunyan Hu,Baojiang Liu
The photocatalytic degradation under mild conditions is considered as a promising solution for water pollution induced by the abuse of antibiotics. Herein, a new nanocomposite constructed (3D/2D) BiVO 4 @Polypyrrole/g-C 3 N 4 ternary composites with Z-scheme was successfully proposed. The result of photocatalytic performance evaluation indicated that BiVO 4 @Polypyrrole/g-C 3 N 4 (5 wt%) exhibited outstanding photocatalytic activity compared with g-C 3 N 4 and BiVO 4 , even under different water quality and ion doping conditions, and the degradation efficiency of tetracycline (TC) can reach 90% within 120 min. The cycle test proved that the prepared composite catalyst has good stability and reusability. DRS, PL and other characterization results illustrated that the improvement of catalytic performance was attributed to electron transfer channel between (3D) BiVO 4 @PPy and (2D) g-C 3 N 4 , which can effectively separate photon-generated carriers. The possible mechanism based on Z-scheme heterojunction was proposed considering the free radical capture, Mott-Schottky, LC-MS and ESR . The present work serves as a principal route to design and extend striking step-scheme g-C 3 N 4- based nanocomposites with promising environmental purification and solar fuel generation usage.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-10
·
IF 5.833
Wang Dongwei,Wang Jiasheng
The potential of functionalized polypyrrole nanowires (PPyNWs) are demonstrated as a platform for lable-free miRNA detection using electrochemical impedance spectroscopy (EIS). MicroRNAs (miRNAs) detection methods and sensors are mainly challenged by very low concentrations in physiological samples and high similarity among family members. Herein, a sensitive and selective miRNA biosensor was constructed based on electrochemically synthesized PPyNWs, which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method. The prepared PPyNWs/PAMAM hybrid combines the excellent electrical conductivity of conducting polymer PPyNWs with high surface to volume ratio of PAMAM. DNA probes were immobilized onto the PPyNWs/PAMAM hybrid for the construction of the miRNA biosensor. Using the sensitive EIS technique to monitor DNA/miRNA hybridization, the developed biosensor demonstrated excellent sensing performances, such as wide linear range (10 −14 M-10 −8 M) and low detection limit (0.34 × 10 −14 M). Even more encouraging, the response sensitivity of the biosensor was 3.12 times higher than that of the bulk PPy-modified sensor, which proved that the microstructure of the PPy nanowires array can greatly improve the performance of the biosensor. Graphical abstract
An ultrasensitive and selective miRNA biosensor was constructed based on electrochemically synthesized polypyrrole nanowires array (PPyNWs), which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qiao He,Qingyun Wu,Xuxu Wang,Shuting Fu,Senchuan Huang,Shengfu Tong,Yangfei Cao,Zheng Liu,Mingmei Wu
Silicon is one of the most promising candidates for anode materials for next-generation lithium-ion batteries due to its high theoretical capacity. However, the catastrophic volume change upon lithiation/delithiation and the subsequent pulverization result in poor electrochemical performance and hinder its applications. To address this issue, a Si@N,S-doped carbon core–shell structure (Si@NSC) is proposed in this work. The composites are prepared by in situ polymerization and pyrolysis. The as-prepared Si@NSC electrode exhibits a stable capacity of 1720 mAh g–1 at 0.3 A g–1 after 550 cycles with a capacity retention of 90.2%. Compared with commercial silicon and a mixture of Si and C, Si@NSC demonstrates high initial efficiency and superior cyclic stability owing to its unique structure and moderate Si/C ratio. The Si@NSC composites shed light on the application of Si-based anode materials for high-capacity lithium storage.
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高影响因子
CARBON
·
2021
·
IF 9.594
Muhammad Sultan Irshad,Xianbao Wang,Adil Abbas,Fang Yu,Jinhua Li,Jianying Wang,Tao Mei,Jingwen Qian,Shuilin Wu,M. Qasim Javed
Salt deposition still remains a significant challenge due to the decreasing evaporation efficiency of solar desalination . Herein, we provide a salt-rejection model coupled with the experimental verification about the chemical diffusion or advection process for solar steam generation. The designed evaporating system established by in-situ polymerization (polypyrrole) of carbon dots modified MnO 2 nanowires coated on non-woven cotton fabric decorated ultra-flexible and super hydrophilic polyurethane foam (30% wicking). The salt-rejection investigations reveal real-time chemical advection phenomena where hot brine flows from the top surface to underneath water through a salinity gradient with the aid of accumulated heat. The prototype demonstrates an excellent salt rejection ability within a minimum record time (2 g/100 min) or once soaked (2 g/60 s). The floatable solar-driven evaporator exhibits incredible flexibility (80%, compressive strain) along with an evaporation rate of 1.68 kg m −2 h −1 , and photothermal conversion efficiency (∼96.4%, solar to vapor) from high-salinity brine (10 wt %) and wastewater containing heavy metal ions (30 wt%). The outdoor test revealed a yield of 13.60 kg m −2 in one sunny day that provides a potential solution to single-step drinking water supply from various resources of the sea, lakes, and mixtures of emulsified oil, bacterial pathogens, and industrial wastewater.
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高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yajun Ji,Feiya Xu,Panli Zhang,Yuanyi Xu,Gaili Zhang
It has attracted more and more attention to deal with chromium(VI) (Cr(VI)) pollution in wastewater due to its potential harm to human health. In this study, poly(pyrrole methane) (PPm), a potential material for Cr(VI) adsorption, was greenly synthesized for the removal of Cr(VI) from aqueous solution. Further, the Fe 3 O 4 nanoparticles were loaded on the surface of PPm to enhance the separation property. The adsorption of Cr(VI) was favorable at a lower pH value, and it conformed to Langmuir and pseudo-second-order model. When the solution pH was 2, the dosage of PPm was 0.5 g L −1 , the reaction temperature was 45 °C, and the reaction time was 24 h, the maximum adsorption capacity of PPm reached 922.49 mg g −1 , which was higher than most of the reported adsorbents (40–560 mg g −1 ). The removal rates reached about 100% even in the presence of competitive ions. The as-prepared adsorbent can be reused for 5 times and the removal rate still exceeded 70%. The adsorption mechanisms of Cr(VI) onto PPm included electrostatic interactions, ion exchange, reduction of Cr(VI) to Cr(III), and immobilization of Cr(III). Although the adsorption capacity of PPm/Fe 3 O 4 was lower than that of the pure PPm (549.75 mg g −1 ), it can be facilely separated from aqueous solution after adsorption. Notably, this study also provided a facile strategy to prepare adsorbent with active functional groups for efficient removal of Cr(VI) from aqueous solution.
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高影响因子
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