scholarly journals Electrochemical Reduction of Uniformly Dispersed Pt and Ag Nanodots on Carbon Fiber Electrodes

2009 ◽  
Vol 2009 ◽  
pp. 1-6
Author(s):  
Yi-Hao Pai ◽  
Gong-Ru Lin
Keyword(s):  
Electron Beam ◽  
Carbon Fiber ◽  
Utilization Efficiency ◽  
Carbon Fiber Electrodes ◽  
Plasma Pretreatment ◽  
Carbon Fiber Electrode ◽  
Self Aggregation ◽  
Fiber Electrode

Electrochemical characterization of the uniformly dispersed Pt and Ag nanodots synthesized after in situ scalable electron-beam reduction on copper grid and carbon-fiber electrode is demonstrated. By employing plasma pretreatment to produce functional organosilicon micronetworks-based reaction sites on copper grid, the size and standard deviation of the electrochemically reduced metallic nanodots can be strictly confined. When detuning the accelerating voltage of electron-beam from 3 to 120 kV, the reshaped nanodot diameter enlarges from12.7±0.8to18.3±3.6 nm due to the gradual self-aggregation. In comparison with sputtering method, the electroactivity of Pt nanodot covered carbon fiber electrode obtained after electron-beam reduction exhibits a larger electroactive surface (Spt) of 16.56 cm2/mg. The electron-beam reduction provides a better dispersion of the reduced Pt nanodots based catalysts on carbon-fiber electrode, promoting the utilization efficiency of these nanoscale catalyst (defined as the ratio of electroactive to geometric area) from 2.5% to 7%.

Highly conductive electrocatalytic gold nanoparticle-assembled carbon fiber electrode for high-performance glucose-based biofuel cells

2019 ◽  
Vol 7 (22) ◽  
pp. 13495-13505 ◽  
Author(s):  
Cheong Hoon Kwon ◽  
Yongmin Ko ◽  
Dongyeeb Shin ◽  
Seung Woo Lee ◽  
Jinhan Cho
Keyword(s):  
Carbon Fiber ◽  
Gold Nanoparticle ◽  
High Power ◽  
High Performance ◽  
Biofuel Cells ◽  
Au Nanoparticle ◽  
Layer By Layer ◽  
Carbon Fiber Electrodes ◽  
Carbon Fiber Electrode ◽  
Fiber Electrode

Au nanoparticle-coated highly conductive carbon fiber electrodes for high-power glucose-biofuel cells were developed based on a layer-by-layer assembling method.

Characterization of Carbon Fiber Electrode for Vanadium-Based Redox Flow Batteries

2015 ◽  
Vol 68 (3) ◽  
pp. 89-95 ◽  
Author(s):  
A. Narita ◽  
Y. Kaneko ◽  
Y. Sato ◽  
A. Negishi ◽  
K. Nozaki ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Carbon Fiber Electrode ◽  
Fiber Electrode

A very rapid in situ Kikuchi technique to determine relative crystal misorientation

1988 ◽  
Vol 46 ◽  
pp. 830-831
Author(s):  
J. I. Bennetch
Keyword(s):  
Electron Beam ◽  
Analytical Techniques ◽  
Superplastic Forming ◽  
The Other ◽  
Kikuchi Pattern ◽  
Kikuchi Line ◽  
Line Analysis

In a recent study of the superplastic forming (SPF) behavior of certain Al-Li-X alloys, the relative misorientation between adjacent (sub)grains proved to be an important parameter. It is well established that the most accurate way to determine misorientation across boundaries is by Kikuchi line analysis. However, the SPF study required the characterization of a large number of (sub)grains in each sample to be statistically meaningful, a very time-consuming task even for comparatively rapid Kikuchi analytical techniques.In order to circumvent this problem, an alternate, even more rapid in-situ Kikuchi technique was devised, eliminating the need for the developing of negatives and any subsequent measurements on photographic plates. All that is required is a double tilt low backlash goniometer capable of tilting ± 45° in one axis and ± 30° in the other axis. The procedure is as follows. While viewing the microscope screen, one merely tilts the specimen until a standard recognizable reference Kikuchi pattern is centered, making sure, at the same time, that the focused electron beam remains on the (sub)grain in question.

Synergistic effect of LiF coating and carbon fiber electrode on enhanced electrochemical performance of Li2MnSiO4

2021 ◽  
Vol 373 ◽  
pp. 137911
Author(s):  
S. Krishna Kumar ◽  
Sourav Ghosh ◽  
Madhushri Bhar ◽  
Ajay K. Kavala ◽  
Sivaraman Patchaiyappan ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Synergistic Effect ◽  
Electrochemical Performance ◽  
Carbon Fiber Electrode ◽  
Enhanced Electrochemical Performance ◽  
Fiber Electrode

Electrochemical sensor for nitric oxide using layered films composed of a polycationic dendrimer and nickel(II) phthalocyaninetetrasulfonate deposited on a carbon fiber electrode

2014 ◽  
Vol 182 (5-6) ◽  
pp. 1079-1087 ◽  
Author(s):  
Juliana Cancino ◽  
Sabine Borgmann ◽  
Sergio A. S. Machado ◽  
Valtencir Zucolotto ◽  
Wolfgang Schuhmann ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Carbon Fiber ◽  
Electrochemical Sensor ◽  
Carbon Fiber Electrode ◽  
Fiber Electrode

scholarly journals CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

2020 ◽  
Author(s):  
Young-Hun Cho ◽  
Jae-Gyoung Seong ◽  
Jae-Hyun Noh ◽  
Da-Young Kim ◽  
Yong-Sik Chung ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Rate Capability ◽  
Ammonium Persulfate ◽  
Chemical Oxidation ◽  
Sem Analysis ◽  
Metal Nanostructures ◽  
Carbon Fiber Electrode ◽  
Coated Carbon ◽  
Fiber Electrode

In this work, we report the carbon fiber-based wire-type asymmetric supercapacitors (ASCs). The highly conductive carbon fibers were prepared by the carbonized and graphitized process using the polyimide (PI) as a carbon fiber precursor. To assemble the ASC device, the CoMnO2-coated and Fe2O3-coated carbon fibers were used as the cathode and the anode materials, respectively. FE-SEM analysis confirmed that the CoMnO2-coated carbon fiber electrode exhibited the porous hierarchical interconnected nanosheet structures, depending on the added amounts of ammonium persulfate (APS) as an oxidizing agent, and Fe2O3-coated carbon fiber electrode showed a uniform distribution of porous Fe2O3 nanorods over the surface of carbon fibers. The nanostructured CoMnO2 were directly deposited onto carbon fibers by a chemical oxidation route without high temperature treatments. In particular, the electrochemical properties of the CoMnO2-coated carbon fiber with the concentration of 6 mmol APS presented the enhanced electrochemical activity, probably due to its porous morphologies and good conductivity. Further, to reduce the interfacial contact resistance as well as improve the adhesion between transition metal nanostructures and carbon fibers, the carbon fibers were pre-coated with the Ni layer as a seed layer using an electrochemical deposition method. The fabricated ASC device delivered a specific capacitance of 221 F g-1 at 0.7 A g-1 and good rate capability of 34.8% at 4.9 A g-1. Moreover, the wire-type device displayed the superior energy density of 60.16 Wh kg-1 at a power density of 490 W kg-1 and excellent capacitance retention of 95% up to 3,000 charge/discharge cycles.

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