Search query: Attractive nanofiber structure based

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abstract: Abstract The support materials are an important part of catalysts and they are the dispersant, adhesive, and support for other components. In this study, three types of thin films with different structures were used as the precursor to prepare loading Pd catalysts. The one step dealloying method was used to prepare a semiconductor nanofiber film (NFF) support material with upward directional growth from the substrate. Pd/NFF and Pd/NiO/NFF loaded Pd catalysts were prepared using NFF as the support material, and the electrochemical catalytic properties for ethanol oxidation in alkaline media were studied. Cyclic votammetry showed that the NFF support material effectively inhibited agglomeration of palladium, increased the number of active sites of Pd, and improved the electrocatalytic properties of Pd for ethanol oxidation. In addition, the Pd/NiO/NFF loaded Pd catalyst obtained by modification with nickel oxide significantly improved the electrocatalytic performance for ethanol oxidation compared with the Pd/NFF loaded Pd catalyst. These results show that NiO is conductive to absorption of oxygen containing groups on the surface of the catalyst and can further improve the electrocatalytic ability of Pd for ethanol oxidation. All of the above results demonstrate that the support material prepared by the dealloying method has application prospects in load type catalysts.
author_names: Qingzhuo Hu

Fabao Zhang

Jinjun Zhang

Wei Jiang

Binglei Zhang
title: Attractive nanofiber structure based on Cu Ti/metal sandwich film with excellent electrocatalytic performance for ethanol oxidation
year: 2020

abstract: Abstract Electrospun carbon nanofibers (CNFs) present an attractive application for energy storage devices. However, current CNFs suffer from poor graphitic structure. In this work, the graphitic structure was improved by adding a small amount of graphene oxide (GO) into water soluble phenolic resin to prepare flexible carbon nanofibers prior to processing. The obtained CNFs exhibit improved electrochemical performance compared with pristine carbon nanofibers. The flexible hybrid membranes with NiMoO 4 uniformly anchored give rise to a high specific capacitance (593 F g 1 at 1 A g 1 based on the mass of hybrid membranes) good rate performance (465 F g 1 at 10 A g 1 and intriguing cycling stability (95.4% after 2000 cycles) simultaneously. The symmetric solid state supercapacitor fabricated by using the as prepared hybrid membrane had a maximum energy density of 9.3 Wh kg 1 and a power density of 3430.6 W kg 1 It also possessed high rate capability of 92.4% with the current density ranging from 0.2 to 10 A g 1 as well as excellent cyclic lifetime over which 80.8% of the capacitance were maintained after 5000 cycles at 5 A g 1
author_names: Xiaodong Tian

Xiao Li

Tao Yang

Kai Wang

Wang Hongbao

Yan Song

Zhanjun Liu

Quan-gui Guo

Chengmeng Chen
title: Flexible carbon nanofiber mats with improved graphitic structure as scaffolds for efficient all solid state supercapacitor
year: 2017

abstract: Monolithic honeycomb structures have been attractive to multidisciplinary fields due to their high strength to weight ratio. Particularly, microhoneycomb monoliths (MHMs) with micrometer scale channels are expected as efficient platforms for reactions and separations because of their large surface areas. Up to now, MHMs have been prepared by a unidirectional freeze drying (UDF) method only from very limited precursors. Herein, we report a protocol from which a series of MHMs consisting of different components can be obtained. Recently, we found that cellulose nanofibers function as a distinct structure directing agent towards the formation of MHMs through the UDF process. By mixing the cellulose nanofibers with water soluble substances which do not yield MHMs, a variety of composite MHMs can be prepared. This significantly enriches the chemical constitution of MHMs towards versatile applications.
author_names: Zheng-Ze Pan

Hirotomo Nishihara

Wei Lv

Cong Wang

Yi Luo

Liubing Dong

Houfu Song

Wenjie Zhang

Feiyu Kang

Takashi Kyotani

Quan-hong Yang
title: Microhoneycomb Monoliths Prepared by the Unidirectional Freeze drying of Cellulose Nanofiber Based Sols: Method and Extensions.
venue: Journal of visualized experiments JoVE
year: 2018

abstract: Recently, carbon nanomaterials are attractive for various applications owing to the benefits derived from their high electrical conductivity, chemical stability and large surface to volume ratio. However, the fabrication process of carbon nanomaterials is complicated and exhibits low productivity. Here we report the facile one pot synthesis of highly porous 1D carbon nanotubes based on three layered polymer nanofibers by using a dual nozzle co electrospinning technique to apply to an energy storage device. Specific capacitance (CG) of the porous carbon nanotube based electrode is 401 F g 1, which is larger than that of the other carbon nanomaterials. Furthermore, the porous carbon nanotube exhibits excellent rate capability and cycle stability due to micro /mesopores in the carbon structure enhancing the active surface area between carbon and the ions of the electrolytes. This unique fabrication technique is an effective approach for forming large scale highly porous carbon nanomaterials for diverse electrochemical applications.
author_names: Jun Seop Lee

Jaemoon Jun

Sunghun Cho

Wooyoung Kim

Jyongsik Jang
title: Electrospun three layered polymer nanofiber based porous carbon nanotubes for high capacity energy storage
year: 2017

abstract: All cellulose composites are usually prepared by removing impurities and surface selective dissolution approach, which detract significantly from their environment friendly properties. In this paper, we report an environment friendly approach to fabricate all cellulose nanofiber composites from stack up bacterial cellulose (BC) hydrogels via self aggregation forces of the hydrogen bond by water based processing. Structural and mechanical properties of BC laminated composites have been investigated. The results indicated that BC composites possess the structure of all nanofibers, a tensile strength of 116 MPa and a storage modulus of 25 GPa. Additionally, the interfacial shear strength and the tensile strength of piece hot press BC demonstrate the strong self aggregation forces of BC nanofibers. Thus, BC laminated composites will be attractive in structural material.
author_names: Zhao-qian Li

Xiaopeng Li

Junming Ren

Bo Wu

Qing Ping Luo

Xun Liu

Chonghua Pei
title: Robust All cellulose Nanofiber Composite from Stack up Bacterial Cellulose Hydrogels via Self aggregation Forces.
venue: Journal of agricultural and food chemistry
year: 2020

abstract: Hybrid structure of TiO2 nanofiber and nanoparticle as a photoelectrode was very attractive in dye sensitized solar cells (DSCs) because TiO2 nanoparticle provided a high specific surface area to adsorb the N719 dye and TiO2 nanofiber was a direct path to transfer photoelectron from dye to electrode. TiO2 nanofiber film was prepared with titanium tetraisopropoxide (TTIP) and polyvinylpyrrolidone (PVP) based precursor by electro spinning process. To fabricate the hybrid structure, TiO2 nanoparticular paste was screen printed on the TiO2 nanofiber film. Electrospun TiO2 nanofiber film and screen printed TiO2 nanoparticular film were combined in layer by layer method. These films were observed as an anatase phase by X ray diffraction pattern. Thickness and diameter of TiO2 nanofibers were ~5mm and ~400nm, respectively. Thickness and particle size of TiO2 particles were ~5mm and ~20nm, respectively. Compared to conventional DSCs, higher short circuit current densities (Jsc) of 6.47 mA/cm2 and higher power conversion efficiency of 3.06 were measured in DSCs having hybrid structure of TiO2 nanofiber and nanoparticle. Electrochemical impedance spectroscopy (EIS) was observed to understand an electron transfer and life time.
author_names: Ji Sun Kim

Seongbo Shim

Tae-Hwan Hwang

Won-Youl Choi
title: Hybrid Structure of TiO2 Nanofiber and Nanoparticle for Dye Sensitized Solar Cells
year: 2014

abstract: Hybrid structure of TiO2 nanofiber and nanoparticle as a photoelectrode was very attractive in dye sensitized solar cells (DSCs) because TiO2 nanoparticle provided a high specific surface area to adsorb the N719 dye and TiO2 nanofiber was a direct path to transfer photoelectron from dye to electrode. TiO2 nanofiber film was prepared with titanium tetraisopropoxide (TTIP) and polyvinylpyrrolidone (PVP) based precursor by electro spinning process. To fabricate the hybrid structure, TiO2 nanoparticular paste was screen printed on the TiO2 nanofiber film. Electrospun TiO2 nanofiber film and screen printed TiO2 nanoparticular film were combined in layer by layer method. These films were observed as an anatase phase by X ray diffraction pattern. Thickness and diameter of TiO2 nanofibers were ~5mm and ~400nm, respectively. Thickness and particle size of TiO2 particles were ~5mm and ~20nm, respectively. Compared to conventional DSCs, higher short circuit current densities (Jsc) of 6.47 mA/cm2 and higher power conversion efficiency of 3.06 were measured in DSCs having hybrid structure of TiO2 nanofiber and nanoparticle. Electrochemical impedance spectroscopy (EIS) was observed to understand an electron transfer and life time.
author_names: Ji Sun Kim

Seongbo Shim

Tae-Hwan Hwang

Won-Youl Choi
title: Hybrid Structure of TiO2 Nanofiber and Nanoparticle for Dye Sensitized Solar Cells
year: 2014

abstract: Abstract A flexible carbon nanofiber membrane (NFM) containing uniformly dispersed MoO2 nanoparticles is facilely fabricated via electrospinning and subsequent controlled reduction carbonization. This NFM is used directly as a binder free anode in lithium ion batteries (LIBs) The self standing carbon/MoO2 (C/MoO2) NFM electrode has a good capacity retention, a satisfactory rate capability and a high reversible capacity of 811 mAh g 1 after 100 cycles at a current density of 100 mA g 1, which is superior to most other MoO2 based anodes. The superior electrochemical properties of the resultant C/MoO2 NFM are attributed to the cooperative effects from the excellent conductivity of the carbon nanofiber matrix, the high electrochemical performance of MoO2, the unique one dimensional nanofiber structure and the three dimensional porous network structure. The present C/MoO2 NFM may be an attractive candidate as an anode material for LIBs.
author_names: Jun Xiang

Zhipeng Wu

Xueke Zhang

Shan-shan Yao
title: Enhanced electrochemical performance of an electrospun carbon/MoO2 composite nanofiber membrane as self standing anodes for lithium ion batteries
year: 2018

abstract: Nano scale materials can be designed to exhibit novel and significantly improved physical and chemical properties. Polymer nanofibers, an important class of nano materials, have attracted increasing attention in the last 10 years because of their high surface to mass (or volume) ratio and special characteristics attractive for advanced applications. In particular, electro spun nanofiber membranes (ENMs) have high porosity, interconnected open pore structure and tailorable membrane thickness. Moreover, their high surface hydrophobicity makes them suitable for membrane distillation (MD) In this paper, recent progresses are reviewed on the preparation of different types of nanofibers with different secondary nanostructures, including hollow nanofibers. Applications of hollow nanofibers for membrane separation processes are then discussed based on an imaginary design of hollow nanofiber module. Application of ENMs in MD is, on the other hand, not a product of imagination but experiments have already been conducted in various laboratories, as reviewed in this paper. In particular, the experimental results obtained in our laboratory for desalination of saline water and gases stripping of VOCs are highlighted. By using an electrospun PVDF nanofiber membrane, saline water with NaCl content of 6% was successfully desalinated for more than 20 days with no indication of membrane wetting. The PVDF ENM could also be successfully used in gas stripping of chloroform, representing VOCs, with mass transfer coefficients higher than hollow fiber membranes. It is expected that MD by ENMs can be applied for many other purposes such as waste water treatment, food processing, and treatment of pharmaceutical products.
author_names: C Feng

Kailash Chandra Khulbe

Takeshi Matsuura

Shahram Tabe

Ahmad Fauzi Ismail
title: Preparation and characterization of electro spun nanofiber membranes and their possible applications in water treatment
year: 2013

abstract: Carbon nanofibers (CNFs) with typical diameters of approximately 80 nm and lengths of the order of micrometers, are extremely attractive in bioanalytical area as they can combine properties of high surface area, non toxicity, acceptable biocompatibility, ease of fabrication, chemical and electrochemical stability, good electrical conductivity. In this work, CNF based composites were successfully used as an immobilization matrix for the construction of a reagentless mediator free hemoglobin based H2O2 biosensor. The results revealed that hemoglobin retained its essential secondary structure in the CNF based composite film. With the advantages of organic inorganic hybrid materials, dramatically facilitated direct electron transfer of hemoglobin and good bioelectrocatalytic activity towards H2O2 were demonstrated. The biosensor displayed good performance along with good long term stability. The CNF based composites were proved to be a promising biosensing platform for the construction of mediator free biosensors, and may find wide potential applications in biosensors, biocatalysis, bioelectronics and biofuel cell.
author_names: Xianbo Lu

Jianhua Zhou

Wu Lu

Qing Liu

Jinghong Li
title: Carbon nanofiber based composites for the construction of mediator free biosensors.
venue: Biosensors bioelectronics
year: 2008