ACS Omega
·
2020
·
IF 2.87
Yanwei Zeng,Zihao He,Qianhui Hua,Qunjie Xu,Yulin Min
Bipolar plates, accounting for a large proportion of proton exchange membrane fuel cells (PEMFCs), are highly susceptible to corrosion by H+, SO42–, and so on because of the strong acid-rich and oxygen/hydrogen-rich environments. In this work, the corrosion resistance of aluminum alloy bipolar plates modified in the cathodic environment of PEMFCs has been investigated. A honeycomb structure is constructed by anodizing on an aluminum alloy (AA5052) bipolar plate, and a polyacrylonitrile (PAN) film is prepared by infusing PAN solution on the surface. From scanning electron microscopy and atomic force microscopy, we observe that the porous structure of the aluminum alloy surface is more advantageous for enhancing the mechanical engagement between PAN and the aluminum alloy. Therefore, the PAN film is dense and smooth. Electrochemical tests confirm that the PAN film greatly improves the corrosion resistance of the aluminum alloy bipolar plate under the cathodic environment of the PEMFC. When graphene oxide (GO) is added, the charge-transfer resistance (Rct) is not only improved but also the stability under oxygen-rich acidic conditions is prolonged.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Qiong Shang,Huixia Feng,Zeyu Feng,Nali Chen,Lin Tan,Jianhui Qiu,Hongjing Wu
Although various materials have been studied for the purpose of microwave absorption (MA), natural sepiolite (SEP) has never been reported as MA absorber. Herein, the series of sepiolite@polyaniline composites (SEP@PANI-x) with “skeleton/skin” structure were fabricated through a facile in-situ polymerization technique and firstly developed as MA materials. The electrical conductivity and dielectric properties can be well controlled via modulating the PANI content in the composites. With a lower mass ratio of 30 wt%, it is worth noting that the optimized SEP@PANI-50 could simultaneously display the optimal minimum reflection loss ( RL min ) of −50.23 dB and effective absorption bandwidth (EAB, RL < -10 dB) of 5.01 GHz with thicknesses of 2.5 and 1.8 mm, respectively. Moreover, when changing absorber thickness (1.5–5.0 mm), the RL min values lower than −20 dB (99% absorption) are all achieved and the EAB ranges the entire Ku, X, and C bands. Such excellent MA performance comes from rich conductive network and polarization relaxation, which ultimately balance the impedance matching and attenuation ability. In view of its facile synthesis route, low-cost, lightweight and excellent MA performance, SEP@PANI-50 would be a very promising MA candidate in many practical applications. More importantly, we also think that our findings will expand the application of SEP-based composites in the electromagnetic field.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Si Chen,Feiyang Wu,Yan Hu,Shichao Lin,Chencheng Yu,Feng Zhu,Xu Wang
A novel fully bio-based intumescent flame retardant PA-GU was prepared by green and convenient ionic reaction of phytic acid (PA) and guanosine (GU) in aqueous environment, being prepared by adding PA-GU completely derived from renewable feedstocks to poly(butylene succinate) (PBS). The tests results showed that when the addition amount of PA-GU was 10 wt%, the peak of heat release rate (pHRR) of the sample decreased 59.2% (from 1413 kW/m 2 to 577 kW/m 2 ), the total heat release (THR) decreased 38.6% (from 132 MJ/m 2 to 81 MJ/m 2 ), and the average mass loss rate decreased to 11 g/m 2 •s (from 13 g/m 2 •s) compared to PBS containing no additive, all of which gradually decreased with the increasement of PA-GU. The preparation of flame retardant PBS composite not only means the expansion of the application of PBS, but also provides a new idea for the preparation of completely biologically derived flame-retardant materials.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Chong Cai,Ran Wang,Shufeng Liu,Xiaoya Yan,Lexin Zhang,Mingli Wang,Qi Tong,Tifeng Jiao
In recent years, new family of two-dimensional (2D) transition metal carbide and carbonitrides-MXene has become critical materials due to their excellent structure and performance. Herein, we have investigated the synthesis of a new MXene-based composite material for efficient dye adsorption in sewage treatment, via a facile hydrothermal method . The characterization of the phytic acid (PA)-MXene composites showed that new rod-like Ti(OH)PO 4 components appeared in the hydrothermal process. In addition, compared with the original MXene , the prepared PA-MXene composite exhibited enhanced adsorption properties for the model dyes MB and RhB, and the adsorption capacity of the PA-MXene composite on MB remained at about 85 % after 12 cycles, indicating important potential as an adsorbent material in wastewater treatment .
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 31
·13877-13884
·
IF 3.591
Chen Xing,Yan Zhang,Yang Gao,Yijun Kang,Shiguo Zhang
The selective oxidation of alcohols is traditionally catalyzed by precious metals, where high cost, low selectivity, poor stability, and environmental concerns have hindered their wide application. Here we report a nitrogen and phosphorus co-doped microporous carbon (NPMC) as an efficient catalyst towards the selective oxidation of benzyl alcohol. NPMC is fabricated from one-step pyrolysis of an aerogel derived from the polymerization of p-phenylenediamine with phytic acid. The optimized NPMC exhibits high efficiency and universality for the selective oxidation of alcohols in an aqueous environment using air as the oxidant, due to its large surface area (∼676 m2 g−1), good hydrophilicity, and suitable microporous structure (1–2 nm), as well as the concerted effects between N and P doping. 50 mg of the catalyst is sufficient for affording almost quantitative amounts of benzyl alcohol oxidized to benzaldehyde without organic solvents and co-catalysts, and its catalytic performance is the best among the metal-free catalysts reported. The heterogeneous catalyst is also perfectly stable, and can be reused several times without significant loss of activity and selectivity.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yingnan Yang,Pang Yang,Linsen Zhou,Ruilin He,Yawei Hao,Jingchuan Wang,Ruizhi Qiu,Xiaochong Zhao,Lijun Yang
Platinum-group metals are the most promising catalysts choice for hydrogen evolution reaction (HER) due to their good catalytic stability and optimum Gibbs free energy for hydrogen adsorption and desorption. However, high cost restricts their industrial application. To lower price, the most commonly used method is to reduce noble metals’ dosage. Herein, iridium (Ir) and its diphosphide (IrP 2 ) based on one-dimensional carbon nanofibers (CNFs) are easily fabricated by electrospinning and following calcination, and then are applied as efficient catalysts for HER. Both Ir-CNFs and IrP 2 -CNFs show excellent HER performances with overpotentials of 22 mV and 19 mV under the current density of 10 mA cm −2 in alkaline medium, respectively. The experimental results are further proved by density function theory (DFT) calculations, in which IrP 2 (2 0 0) shows better HER kinetics than Ir (1 1 1) with lower water adsorption and hydrogen evolution energies. This work presents a simple method to prepare Ir-CNFs and IrP 2 -CNFs and provides a new feasibility for design and synthesis of efficient and stable HER catalysts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2021
·
IF 5.485
Zhenyang Zhou,Qikai Shentu,Weijie Cai,Yuyuan Yao
The highly efficient biochar-based catalysts from agricultural biomass wastes receive tremendous interest in the wastewater restoration field because of lower cost and environmental friendliness. Herein, the abundant agricultural waste loofah sponge is used as the precursor to prepare eco-friendly carbonized loofah sponge encapsulating Iron Phosphide nanoparticles (CLS-IP) by a facile pyrolysis strategy. The as-synthesized CLS-IP not only exhibited excellent catalytic activity for Acid Red 1 removal via activating peroxymonosulfate (PMS), which achieved 94.4% removal in 24 min, but also removed other common pollutants including phenolic compounds , sulfonamides, and dyes. Besides, the iron ions leaching (0.03–0.19 ppm) was obviously lower than 2.00 ppm according to European standard even after reuse. Surprisingly, the used CLS-IP catalyst could be effectively regenerated after the oxalic acid immersion treatment. In addition, the CLS-IP still exhibited remarkable catalytic activity even after five months of storage. Four types of reactive oxygen species (ROS) including hydroxyl radical (•OH), sulfate radical (SO 4 •− ), superoxide radical (O 2 •− ), and singlet oxygen ( 1 O 2 ) were generated during the reaction, and the superoxide radical made a dominant contribution. This work provided an avenue for developing low-cost biochar-based catalysts in environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 46
·51364
·
IF 3.125
Huimin Zhang,Dan Meng,Wenjia Wang,Hongfei Li,Xiaoyu Gu,Sheng Zhang,Jun Sun,Fei Xin,Zuodong Qin,Wufei Tang
A modified kaolinite by grafting with phytic acid (PA-g-Kaol) is fabricated, and it was introduced into ethylene vinyl acetate (EVA) with intumescent flame retardancy (IFR) together to improve the flame retardancy of EVA composites. The results show the limiting oxygen index value of EVA/ (18.0 wt% IFR)/ (2.0 wt% PA-g-Kaol) is 30.8%. Meanwhile, there is only one dripping produced in the vertical burning test. What's more, the flame-retardant mechanism is demonstrated by TG-IR, real-time-IR and GC–MS analysis. The results indicate that some pyrolytic products of IFR and PA-g-Kaol, like ammonia and phosphoric acid, catalyze the crosslinking of EVA and flame retardant, the resultant compact char protects the substrate from further burning.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 41
·2104433
·
IF 18.808
Biyu Jin,Dongyun Wang,Juan Zhu,Hongyu Guo,Yang Hou,Xiang Gao,Jianguo Lu,Xiaoli Zhan,Xiaojun He,Qinghua Zhang
Large volume change, poor conductivity, and electrolyte soluble active materials intermediates have long been daunting challenges for sulfur, silicon, and silicon oxides electrode materials. A self-healable polyelectrolyte binder is exploited by crosslinking polydopamine, phytic acid and poly(acrylamide- co -2-(Dimethylamino)ethyl acrylate) in situ at room temperature through reconfigurable hydrogen bonds and ionic bonds. Therefore, the crosslinked binder network can readily recover its mechanical strength without extra stimulus, offering a reliable strategy for electrodes plagued by large volume change issue. Sulfur (S) and silicon (Si) electrodes prepared using the self-healable polyelectrolyte binder can effectively maintain its structure integrity after long-term cycling. In addition, the polar groups, especially negative-charged phosphate ions empower the polyelectrolyte binder as a more effective binder than commercial poly(vinylidene fluoride) in terms of restraining lithium polysulfides shuttling and accelerating lithium ion transportation, as evidenced by in situ UV-visible spectroscopy, density functional theory calculation and cyclic voltammetry. Consequently, high-active materials loading S cathode, Si and SiO-graphite anodes all achieve high area capacity and satisfying cycling stability by conveniently applying the advanced binder. This facile strategy for constructing multiuse binder illuminates versatile development in many energy storage systems.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Yuan Wang,Jianfei Xiao,Hanzhi Wang,Tian C. Zhang,Shaojun Yuan
Designing of hetero-atomic doped carbon-based systems through pyrolysis of abundant element organic precursors is a novel approach to construct rational porous carbon materials. Herein, a highly-cross-linked triazine polymer is employed to fabricate N, P co-doped porous carbon (A-TDP-12) with tunable active nitrogen in the carbon framework for simultaneous enhancement of CO 2 capture capability and Supercapacitance (SC). The synthesized A-TDP-12 possesses a typical hierarchically porous framework (micro-pores and meso-pores) with a large surface area (1332 m 2 g −1 ) and a rich content of N (7.89 at.%) and P (0.74 at.%). It delivers a CO 2 adsorption capacity of 1.52 and 5.68 mmol g −1 at 1 and 5 bar, respectively, with almost no decay after successive 8 recycles. In 6 M KOH aqueous electrolyte, A-TDP-12 exhibits a superior specific capacitance of 172.7 F g −1 at a current density of 1 A g −1 . Even at a high current density of 10 A g −1 , 80% of its initial capacity still remains. This work not only offers a novel strategy for fabricating promising adsorbents and electrodes for CO 2 uptake and SCs, but also provides new insights into design of porous carbon material for related applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yuchun Li,Jinzhao Wang,Boqiong Xue,Shuheng Wang,Peng Qi,Jun Sun,Hongfei Li,Xiaoyu Gu,Sheng Zhang
An integrated multi-functional additive was fabricated by successively grafting melamine (MEL) and phytic acid (PhA) on multiwalled carbon-nanotubes (MWNCTs), and was then applied in PA6 to improve the flame retardancy and light aging resistance of the composite. The limit oxygen index of PA6 composite containing 7 wt% PhA-MEL-MWCNTs was increased to 26.4 from 21.0. The smoke and CO release were significantly reduced by 48% and 88% respectively, and the severe melt dripping of PA6 in burning was eliminated. It is proved that PhA-MEL-MWCNTs can absorb ultraviolet (UV) radiation, and hence significantly reduces the mechanical property loss of the PA6 composite after UV aging. The tensile strength of the aged PA6/7 wt%PhA-MEL-MWCNTs composite sample only decreased by 18.1%, which was significantly lower than the loss rate of the control aged PA6 sample (62.5%). This protocol provides a new opportunity for fabricating long-life flame retardant polyamide composites.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 11
·4531-4546
·
IF 3.665
Sujie Yang,Bing Zhang,Mengru Liu,Yadong Yang,Xinliang Liu,Depeng Chen,Bibo Wang,Gang Tang,Xiuyu Liu
Using phytic acid (PA) and piperazine (Pi) as raw materials, piperazine phytate (PA-Pi) was fabricated by simple ionic reaction. Furthermore, A series of rigid polyurethane foam/piperazine phytate (RPUF/PA-Pi) composites were prepared by one-step water-blown technology. Thermogravimetric (TG) results showed that the addition of PA-Pi improved the thermal stability of RPUF/PA-Pi composites at high temperature. At 700°C, RPUF/PA-Pi20 exhibited the highest carbon residue of 25.8 wt%. Cone calorimetry and smoke density tests suggested that PA-Pi could reduce the heat and smoke release during combustion process of the composites, thus reducing their fire hazard. Thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR) indicated that PA-Pi significantly inhibited the release of toxic gases (isocyanate compounds, aromatic compounds, CO and HCN) and flammable gases (hydrocarbons and esters) during the decomposition process of RPUF/PA-Pi composites, effectively improving fire performance of the composites. Scanning electron microscope (SEM), Raman and Fourier transform infrared spectroscopy (FTIR) were used to characterize the carbon residue of RPUF/PA-Pi composites. The results showed that PA-Pi could promote the formation of dense carbon layer of composites and effectively prevented heat and mass transfer in the combustion process.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）