JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Junbin Liao,Xinyan Yu,Nengxiu Pan,Jun Li,Jiangnan Shen,Congjie Gao
Fabricating stable mono-/multi-valent anion-selective membranes with high perm-selectivity for electrodialysis (ED) applications is critical but challengeable. In this work, we have fabricated a series of novel homogeneous monovalent anion-selective amphoteric ion-exchange membranes (AIEMs, PAES-im-Xc) based on a long-side-chain type imidazolium-functionalized poly(arylene ether sulfone) cross-linked with 4,4′-diazostilbene-2,2′-disulfonic acid disodium salt (DAS) for ED. By tuning the mass percent of DAS added, low swelling ratio but appreciably high anion perm-selectivity (in Cl – /SO 4 2– system) of optimized AIEM are achieved to values of 8.0% and 47.12 at current density of 2.5 mA cm –2 , respectively. In particular, at an enhanced current density of 5.0 mA cm –2 , its perm-selectivity reaches 12.5, significantly outperforming commercial monovalent anion-selective Neosepta ACS (5.27). The appreciably high perm-selectivity possibly arises from pore-size sieving effect from dense matrix structure with cross-linkings and strong electrostatic repulsion between negative fixed –SO 3 – groups and negative divalent ions of SO 4 2– in feeding solution. The superior performances might be particularly interesting findings that can facilitate the development of advanced mono-/bi-valent anion-selective membranes in applications of sea water desalination, resource recovery and water treatment/pretreatment etc..
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JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Min Hong,Chao Zhou,Shusheng Xu,Xianzhu Ye,Zhi Yang,Liying Zhang,Zhihua Zhou,Nantao Hu,Yafei Zhang
Metal organic frameworks are regarded as promising electrode material for supercapacitors , however, low conductivity and pulverization hinder their application as free-standing film electrodes for high-performance supercapacitors . Herein, we demonstrate a core-sheath structured film electrode based on bi-metal organic framework nanosheets assembled on Ni wire for energy-dense supercapacitors. Dual metal-based vertically oriented metal organic frameworks nanosheets assembled on Ni wires can offer high surface areas, structure stability, as well as high conductivity, capacity, and rate capability. The as-fabricated Ni@CoNi-MOF film electrode delivers a specific capacity of 813C cm −3 at 0.5 A cm −3 and a high rate performance of 325C cm −3 at 5 A cm −3 . Moreover, the assembled hybrid supercapacitor based on Ni@CoNi-MOF film (positive electrode) and graphene/carbon nanotube hybrid film (negative electrode) exhibits a high volumetric capacitance of 100 F cm −3 at 0.5 A cm −3 and an high energy density of 31.3 mWh cm −3 with the power density of 3769.4 mW cm −3 . Remarkably, capacitance of as-assembled hybrid supercapacitor device retains 100% after 10000 cycles at 3 A cm −3 , indicating a long cycling stability. The concept design of this work can give an insight for engineering metal organic frameworks based or other similar electrode materials for volumetric-energy dense supercapacitors.
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NANO LETTERS
·
2019
·
IF 12.279
Xiaolei Yuan,Yong Zhang,Muhan Cao,Tong Zhou,Xiaojing Jiang,Jinxing Chen,Fenglei Lyu,Yong Xu,Jun Luo,Qiao Zhang,Yadong Yin
Developing high-performance electrocatalysts for the ethanol oxidation reaction (EOR) is critical to the commercialization of direct ethanol fuel cells. However, current EOR catalysts suffer from high cost, low activity, and poor durability. Here we report the preparation of PdBi-Bi(OH)3 composite nanochains with outstanding EOR activity and durability. The incorporation of Bi can tune the electronic structure and downshift the d-band center of Pd while the surface decoration of Bi(OH)3 can facilitate the oxidative removal of CO and other carbonaceous intermediates. As a result, the nanochains manifest an exceptional mass activity (5.30 A mgPd–1, 4.6-fold higher than that of commercial Pd/C) and outstanding durability (with a retained current density of ∼1.00 A mgPd–1 after operating for 20 000 s). More importantly, the nanochain catalyst can be reactivated, and negligible activity loss has been observed after operating for 200 000 s with periodic reactivation, making it one of the best EOR catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jun Pan,Kang Yu,Hongzhi Mao,Lili Li,Yuchen Zhang,Yanlu Li,Paulo J. Ferreira,Jian Yang
A simple synthesis has been developed for watermelon-like nanocomposites with Ti-based oxides as the matrix. Using the case of Sb nanocrystals in amorphous TiPO x as an example, in-situ/ex-situ techniques, first-principle calculations and control experiments confirm that the formation of Ti-based oxides promotes the reduction of Sb 3+ to Sb by NH 3 at an elevated temperature. A similar synthesis process also succeeds for Sb nanocrystals in amorphous TiO 2 and for Bi nanocrystals in amorphous TiPO x , confirming the promising potential of this synthesis. More importantly, the nanocomposite composed by crystalline Sb in an amorphous TiPO x matrix, as the anode material for sodium storage, concurrently exhibits a long cycle life (~1000 cycles) and a high capacity retention (~82%), suggesting the advantages of watermelon-like structures.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Hui Zhou,Songtao Zhong,Ming Shen,Jianhua Hou,Wuxia Chen
Herein, we fabricate a Bi/Bi 2 O 2 CO 3 heterojunction via one-pot in situ deposition of Bi nanoparticles on Bi 2 O 2 CO 3 nanosheets , using formamide both as a carbon/alkali source and a reductant and demonstrate that the content of Bi in Bi/Bi 2 O 2 CO 3 composites can be tuned by adjusting the hydrothermal reaction time. Systematic characterization and analysis of as-prepared composites revealed that the initial in situ growth of Bi nanoparticles on BiOCOOH (an intermediate formed during the decomposition of formamide) was followed by the reaction of BiOCOOH with CO 3 2− to afford Bi 2 O 2 CO 3 nanosheets. The photocatalytic activity (PCA) of Bi/Bi 2 O 2 CO 3 was evaluated by degradation of rhodamine B (RhB) under simulated solar light irradiation, and the best result (99.61% degradation efficiency after 50-min irradiation) was observed for the photocatalyst obtained after 12-h hydrothermal treatment. The enhanced photocatalytic performance was ascribed to visible-light harvesting and electron-hole separation efficiency improvements caused by the surface plasmon resonance of Bi nanoparticles. Moreover, the developed photocatalyst displayed high photochemical stability and reusability during ten photocatalytic cycling runs and was therefore concluded to be well suited for practical wastewater purification applications. Thus, this work provides a new and facile method of utilizing non-noble Bi nanoparticles to optimize the PCA of semiconductor materials.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Shuang Zhao,Rongrong Tian,Baiqi Shao,Yang Feng,Senwen Yuan,Langping Dong,Liang Zhang,Kai Liu,Zhenxin Wang,Hongpeng You
Herein, a novel multifunctional nanoplatform was designed toward multimodality imaging and photothermal therapy (PTT). It was found that Bi nanoparticles could grow in situ on the surface of NaYF4:20%Yb,2%Er@NaYF4:40%Yb@NaGdF4 core–shell nanoparticles (labeled as UCNPs). In this structure, UCNPs were mainly employed as an upconversion luminescence (UCL) imaging agent, whereas the Bi nanoparticles worked as an effective CT imaging and photothermal agent. Importantly, a dense SiO2 shell was employed to protect the Bi nanoparticles from oxidation, and it also endowed the nanoplatform with excellent hydrophilic ability. The effective UCL/CT imaging and PTT performances were emphasized by a series of in vivo experiments, which suggest that the integrated nanoplatform with imaging and therapy functions shows great promise in the biomedical field.
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RSC Advances
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2014
·Vol. 4
·期 19
·9693-9700
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IF 3.708
Jian Zou,Yun-Gui Peng,Yi-You Tang
Monodisperse Fe3O4@SiO2 nanoparticles are prepared using hydrazine as a catalyst via a biphase approach without any alcohols or surfactants. Fe3O4 seeds can be dispersed well in this system. The sizes of Fe3O4@SiO2 nanoparticles with a single core could be regulated from 20 nm to 50 nm corresponding to SiO2 shell thickness from 3 nm to 17 nm. Core-free SiO2 nanoparticles are not observed in this system. The coating process can be implemented at a temperature greater than 90 °C, which results in a short coating duration from 2 h to 8 h for different shell thicknesses. Hydrazine can prevent the Fe3O4 core from oxidization during coating at this temperature. Fe3O4@SiO2 nanoparticles have high chemical stability and magnetic saturation. A plausible formation mechanism of these nanoparticles is also presented.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2014
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IF 1.716
Xijia He,Xuhui Xu,Youming Shi,Jianbei Qiu
The Ag ions were introduced into the Bi doped silicogermanate glasses by Ag + for Na + ion exchange method. After ion exchange, the X-ray photoelectron spectroscopy (XPS) spectrum implied the Ag ions were mainly in ionic form (Ag + ) within the glasses. With the increase of the Ag + concentration, more relaxation of local structure would be induced at the non-bridging oxygen (NBO), meaning that the network gave more negative sites. Bi 3+ ions could be reduced to lower valence states of Bi containing Bi near infrared (NIR) active centers with the depolymerization of glass network, resulting in the enhancement of the Bi NIR luminescence. After heat treatment, the XPS, absorption spectra and transmission electron microscope (TEM) images revealed Ag nanoparticles (Ag NPs) formed in glasses. With the increase of the Ag NPs concentration, more NBOs released from Ag + , which led to reduce more Bi 3+ ions to lower valence states of Bi containing Bi NIR active centers, resulting in further enhancement of the NIR luminescence. Our research may extend the understanding of structural modulation in Bi valence states and offer a valuable way to enhance the NIR luminescence of Bi in glasses.
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Materials Chemistry Frontiers
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2017
·Vol. 1
·期 12
·2656-2663
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IF 0
Chen Wu,Yuehua Wei,Qingwang Lian,Chao Cui,Weifeng Wei,Libao Chen,Chengchao Li
Enhancing the conductivity of electrode materials is critically important for improving the high-rate performance of Na-ion batteries (NIBs). Herein, we report a multifaceted strategy for optimizing the conductivity and electrochemical properties of nickel cobalt selenides via the combination of fine component regulation and C coating. The electrical conductivity of C@Ni0.33Co0.67Se2/C nanofiber (CNF) (Co0.67) hybrids achieved in this study was 0.3733 S mm−1, a conductivity five-fold higher than that of selenides with a Ni/Co ratio of 2 : 1. Coupled with desirable three-dimensional (3D) nanobrush morphology and the 1D conducting path of CNFs, the Co0.67 electrode achieved a superior rate performance of 413.1 mA h g−1, even at 2 A g−1. Furthermore, the Co0.67 electrode exhibited an impressive cycling performance of 499 mA h g−1 after 100 cycles (exhibiting an 89.5% capacity retention of the second cycle). Finally, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry analysis at different sweep rates were conducted to demonstrate the Co0.67 electrode's fast charge/ion transport ability and increased electrode kinetics.
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Materials
·
2016
·Vol. 9
·期 9
·779
·
IF 2.728
Yingfei Hou,Lingqian Kong,Xiuping Ju,Xiaoli Liu,Jinsheng Zhao,Qingshan Niu
Two novel triphenylamine-based thiophene derivative monomers, 4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine and 4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine, were successfully synthesized. The corresponding polymers including poly (4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) and poly (4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) were electrochemically synthesized and characterized by multiple test method. The electrochemical measurements and spectroelectrochemical analyses revealed that both of the two polymers had quasi-reversible redox behavior and multi-electrochromic properties. The two polymer films showed reversible electrochemical oxidation, excellent optical contrasts in NIR region (62% at 1070 nm for the first polymer, and 86% at 1255 nm for the second polymer), satisfactory coloration efficiencies and fast switching times. The research on the application of the as prepared polymer in the fabrication of electrochromic device was also conducted, employing PCMTPA or PMMTPA as the anodically coloring materials.Keywords:4-cyanotriphenylamine;4-methoxytriphenylamine;bithiophenes derivatives;electrochromism;spectroelectrochemistry;electrochromic devices
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Bo Wang,Wenhui Feng,Lulu Zhang,Yan Zhang,Xueyan Huang,Zhibin Fang,Ping Liu
A novel Bi/CdS nanocomposite is obtained via an in-situ chemical reduction method under mild conditions. The incorporation of Bi nanostructure can significantly enhance the photocatalytic performance for methyl orange (MO) and salicylic acid (SA) degradation compared with pristine CdS under visible light irradiation. The dramatically improved photoactivity can be attributed to the enhanced light absorption and optimized charge separation. In addition, the photocatalysis mechanism upon Bi/CdS for MO degradation is also investigated. This study is hoped to provide a new inspiration for the construction of high-efficiency semimetal/semiconductor photocatalysts, especially for non-noble metal/M x S y nanocomposites.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Beijia Yuan,Liang Bao,Huaiwei zhang,Yong-jun Yuan
In this paper, carbon supported Bi 2 O 3 -BiOCl-Bi heterostructures were successfully synthesized via a facile and simple hydrothermal method. A series of structure and morphology testing clearly showed that carbon and metallic Bi were deposited on the surface margin of Bi 2 O 3 -BiOCl, which benefited the rapid transfer of internal photogenerated electrons. Photophysical experiments including electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) indicated that the amount of surface oxygen vacancies (OVs) was significantly increased, which act as reactive active sites and therefore effectively enhance the photocatalytic performance. The photocatalytic N 2 reduction yield of C@Bi 2 O 3 -BiOCl-Bi was remarkably improved to 400 μg·L −1 , which was 3.63 times higher than that of BiOCl. This research demonstrated a feasible strategy to construct advanced photocatalyst by incorporating defect-rich structures and surface engineering.
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