Combining operando X-ray experiments and modelling to understand the heterogeneous lithiation of graphite electrodes

2021 ◽  
Vol 9 (7) ◽  
pp. 4281-4290
Author(s):  
Samuel Tardif ◽  
Nicolas Dufour ◽  
Jean-François Colin ◽  
Gérard Gébel ◽  
Manfred Burghammer ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Experimental Measurement ◽  
Graphite Electrode ◽  
Graphite Electrodes ◽  
X Ray ◽  
Porous Graphite

Experimental measurement of lithium distribution across the depth of a thick porous graphite electrode using operando microXRD and numerical modelling provide an unprecedented view of the lithiation of graphite.

In Situ X-ray Visualization of the Lithiation Process in a Porous Graphite Electrode in an Operating Li-Ion Cell

2015 ◽  
Vol 2 (10) ◽  
pp. 1535-1540 ◽  
Author(s):  
Shohji Tsushima ◽  
Weihao Hung ◽  
Phengxay Deevanhxay ◽  
Genki Kobayashi ◽  
Ryoji Kanno ◽  
...  
Keyword(s):  
Graphite Electrode ◽  
X Ray ◽  
Porous Graphite ◽  
Li Ion

Effect of HF in LiPF6 Based Electrolytes on the Properties of Surface Passivation Films Formed on Graphite Electrodes in Li Secondary Batteries

1997 ◽  
Vol 496 ◽  
Author(s):  
T. Sato ◽  
M. Deschamps ◽  
H. Suzuki ◽  
H. Ota ◽  
H. Asahina ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Hydrofluoric Acid ◽  
Surface Passivation ◽  
Graphite Electrode ◽  
Surface Film ◽  
Solid Electrolyte Interphase ◽  
Electrochemical Measurement ◽  
Graphite Electrodes ◽  
X Ray ◽  
Synthetic Graphite

ABSTRACTThe effect of hydrofluoric acid (HF) concentration in conventional LiPF6/EC+DEC electrolyte on the properties of solid electrolyte interphase (SEI) films formed on synthetic graphite electrode and the electrochemical performance were studied using x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), elemental analysis and electrochemical measurement. The morphology and composition of SEI are affected by a small amount of HF in the electrolyte. Higher F content in the SEI was observed when high HF electrolyte were used, although the irreversible capacities used for formation of SEI were nearly the same value. The cycleability of the synthetic graphite electrode was greatly improved when surface film contains larger amount of LiF.

scholarly journals Electrochemical Investigation of Curcumin–DNA Interaction by Using Hydroxyapatite Nanoparticles–Ionic Liquids Based Composite Electrodes

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4344
Author(s):  
Merve Uca ◽  
Ece Eksin ◽  
Yasemin Erac ◽  
Arzum Erdem
Keyword(s):  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Dna Interaction ◽  
Composite Electrodes ◽  
Hydroxyapatite Nanoparticles ◽  
Graphite Electrodes ◽  
X Ray ◽  
Pulse Voltammetry ◽  
Polymerase Chain

Hydroxyapatite nanoparticles (HaP) and ionic liquid (IL) modified pencil graphite electrodes (PGEs) are newly developed in this assay. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and cyclic voltammetry (CV) were applied to examine the microscopic and electrochemical characterization of HaP and IL-modified biosensors. The interaction of curcumin with nucleic acids and polymerase chain reaction (PCR) samples was investigated by measuring the changes at the oxidation signals of both curcumin and guanine by differential pulse voltammetry (DPV) technique. The optimization of curcumin concentration, DNA concentration, and the interaction time was performed. The interaction of curcumin with PCR samples was also investigated by gel electrophoresis.

Shielding evaluation of on‐package conformal shields by numerical modelling and experimental measurement

2017 ◽  
Vol 53 (14) ◽  
pp. 916-918 ◽  
Author(s):  
H.H. Park ◽  
K. Seo ◽  
Y.‐K. Kwon ◽  
H.‐B. Park
Keyword(s):  
Numerical Modelling ◽  
Experimental Measurement

Electrolytic Behavior Silver Microphases and Nanophases on the Graphite Electrode Surface

2016 ◽  
Vol 712 ◽  
pp. 117-122 ◽  
Author(s):  
Daria O. Perevezentseva ◽  
Eduard Gorchakov ◽  
Yulia A. Oskina
Keyword(s):  
Silver Nanoparticles ◽  
Silver Oxide ◽  
Graphite Electrode ◽  
Reducing Agent ◽  
Molar Ratio ◽  
Graphite Electrodes ◽  
Stepwise Mechanism ◽  
Voltage Curve ◽  
Current Voltage ◽  
Current Voltage Curve

The stepwise mechanism of electrooxidation and reduction of silver nanophases and microphases is proposed on the graphite electrodes surface in alkaline medium. The electrochemical splitting of silver nanophases peak is observed on the anodic branch of the cyclic current-voltage curve. There is the shoulder at E = 0.2 V on the he anodic branch of cyclic current-voltage curve. The appearance of additional cathodic wave at E = -0.08 V is observed on the cathodic branch of the cyclic current-voltage curve that is caused by the reduction of silver nanoparticles. The additional cathode maximum is represented at 0.3 V on the cathodic branch of the cylic current-voltage curves of only silver nanophases. This effect is associated the catalytic process of decomposition of hydrogen peroxide on silver nanoparticles surface. The offset of the cathodic maxima of current-voltage curves of silver nanophases obtained with an excess of a reducing agent are observed to more negative potentials. There is a significant decrease of the all currents maxima compared to silver nanophases obtained with an equal molar ratio of reactants. These results may be connected with the formation of silver oxide monolayers in the different oxidation in the presence of large amounts a reducing agent. The excess of the reducing agent required for the preparation of silver nanoparticles leads to decrease of the cathodic maximum of silver nanoparticles

scholarly journals Evidence for Involvement of an Electron Shuttle in Electricity Generation by Geothrix fermentans

2005 ◽  
Vol 71 (4) ◽  
pp. 2186-2189 ◽  
Author(s):  
Daniel R. Bond ◽  
Derek R. Lovley
Keyword(s):  
Organic Compounds ◽  
Electricity Generation ◽  
Graphite Electrode ◽  
Electricity Production ◽  
Electron Shuttle ◽  
Complete Oxidation ◽  
Electrical Characteristics ◽  
Graphite Electrodes ◽  
Oxidation Of Organic Compounds ◽  
Geothrix Fermentans

ABSTRACT In experiments performed using graphite electrodes poised by a potentiostat (+200 mV versus Ag/AgCl) or in a microbial fuel cell (with oxygen as the electron acceptor), the Fe(III)-reducing organism Geothrix fermentans conserved energy to support growth by coupling the complete oxidation of acetate to reduction of a graphite electrode. Other organic compounds, such as lactate, malate, propionate, and succinate as well as components of peptone and yeast extract, were utilized for electricity production. However, electrical characteristics and the results of shuttling assays indicated that unlike previously described electrode-reducing microorganisms, G. fermentans produced a compound that promoted electrode reduction. This is the first report of complete oxidation of organic compounds linked to electrode reduction by an isolate outside of the Proteobacteria.

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