Conducting Electronic Polymers by Non-Redox Processes

1988 ◽  
Author(s):  
Alan G. MacDiarmid
Keyword(s):  
Redox Processes

Anionic and Cationic Redox Processes in β-Li2IrO3 and Their Structural Implications on Electrochemical Cycling in Li-Ion Cell

2019 ◽  
Author(s):  
Paul Pearce ◽  
Gaurav Assat ◽  
Antonella Iadecola ◽  
François Fauth ◽  
Rémi Dedryvère ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Charge Compensation ◽  
Coupling Mechanism ◽  
Redox Processes ◽  
Positive Electrodes ◽  
X Ray ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Electrochemical Instability ◽  
High Degree

The recent discovery of anionic redox as a means to increase the energy density of transition metal oxide positive electrodes is now a well established approach in the Li-ion battery field. However, the science behind this new phenomenon pertaining to various Li-rich materials is still debated. Thus, it is of paramount importance to develop a robust set of analytical techniques to address this issue. Herein, we use a suite of synchrotron-based X-ray spectroscopies as well as diffraction techniques to thoroughly characterize the different redox processes taking place in a model Li-rich compound, the tridimentional hyperhoneycomb β-Li2IrO3. We clearly establish that the reversible removal of Li+ from this compound is associated to a previously described reductive coupling mechanism and the formation of the M-(O-O) and M-(O-O)* states. We further show that the respective contributions to these states determine the spectroscopic response for both Ir L3-edge X-ray absorption spectroscopy (XAS) and X-ray photoemissions spectroscopy (XPS). Although the high covalency and the robust tridimentional structure of this compound enable a high degree of reversibile delithiation, we found that pushing the limits of this charge compensation mechanism has significant effects on the local as well as average structure, leading to electrochemical instability over cycling and voltage decay. Overall, this work highlights the practical limits to which anionic redox can be exploited and sheds some light on the nature of the oxidized species formed in certain lithium-rich compounds.<br>

Anionic and Cationic Redox Processes in β-Li2IrO3 and Their Structural Implications on Electrochemical Cycling in Li-Ion Cell

2019 ◽  
Author(s):  
Paul Pearce ◽  
Gaurav Assat ◽  
Antonella Iadecola ◽  
François Fauth ◽  
Rémi Dedryvère ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Charge Compensation ◽  
Coupling Mechanism ◽  
Redox Processes ◽  
Positive Electrodes ◽  
X Ray ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Electrochemical Instability ◽  
High Degree

The recent discovery of anionic redox as a means to increase the energy density of transition metal oxide positive electrodes is now a well established approach in the Li-ion battery field. However, the science behind this new phenomenon pertaining to various Li-rich materials is still debated. Thus, it is of paramount importance to develop a robust set of analytical techniques to address this issue. Herein, we use a suite of synchrotron-based X-ray spectroscopies as well as diffraction techniques to thoroughly characterize the different redox processes taking place in a model Li-rich compound, the tridimentional hyperhoneycomb β-Li2IrO3. We clearly establish that the reversible removal of Li+ from this compound is associated to a previously described reductive coupling mechanism and the formation of the M-(O-O) and M-(O-O)* states. We further show that the respective contributions to these states determine the spectroscopic response for both Ir L3-edge X-ray absorption spectroscopy (XAS) and X-ray photoemissions spectroscopy (XPS). Although the high covalency and the robust tridimentional structure of this compound enable a high degree of reversibile delithiation, we found that pushing the limits of this charge compensation mechanism has significant effects on the local as well as average structure, leading to electrochemical instability over cycling and voltage decay. Overall, this work highlights the practical limits to which anionic redox can be exploited and sheds some light on the nature of the oxidized species formed in certain lithium-rich compounds.<br>

An Excel Workbook for Identifying Redox Processes in Ground Water

2009 ◽  
Author(s):  
Bryant C. Jurgens ◽  
Peter B. McMahon ◽  
Francis H. Chapelle ◽  
Sandra M. Eberts
Keyword(s):  
Ground Water ◽  
Redox Processes

scholarly journals Redox processes inform multivariate transdifferentiation trajectories associated with TGFβ-induced epithelial–mesenchymal transition

2014 ◽  
Vol 76 ◽  
pp. 1-13 ◽  
Author(s):  
Adam F. Prasanphanich ◽  
C. Andrew Arencibia ◽  
Melissa L. Kemp
Keyword(s):  
Epithelial Mesenchymal Transition ◽  
Redox Processes ◽  
Mesenchymal Transition

Clostridium isatidis colonised carbon electrodes: voltammetric evidence for direct solid state redox processes

2000 ◽  
Vol 24 (3) ◽  
pp. 179-181 ◽  
Author(s):  
Richard G. Compton ◽  
Susan J. Perkin ◽  
David P. Gamblin ◽  
James Davis ◽  
Frank Marken ◽  
...  
Keyword(s):  
Solid State ◽  
Carbon Electrodes ◽  
Redox Processes ◽  
Direct Solid

Capacitance Effects Superimposed on Redox Processes in Molecular-Cluster Batteries: A Synergic Route to High-Capacity Energy Storage

2013 ◽  
Vol 19 (34) ◽  
pp. 11235-11240 ◽  
Author(s):  
Heng Wang ◽  
Zhaoyang Zeng ◽  
Naoya Kawasaki ◽  
Hellmut Eckert ◽  
Hirofumi Yoshikawa ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Capacity ◽  
Molecular Cluster ◽  
Redox Processes ◽  
Capacitance Effects

Role of ion exchange in the redox processes of a polyaniline film studied by an ac quartz crystal microbalance

1990 ◽  
Vol 290 (1-2) ◽  
pp. 269-274 ◽  
Author(s):  
S. Cordoba-Torresi ◽  
C. Gabrielli ◽  
M. Keddam ◽  
H. Takenouti ◽  
R. Torresi
Keyword(s):  
Ion Exchange ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Redox Processes ◽  
Polyaniline Film

scholarly journals Study of redox mechanism of poly(o-aminophenol) using in situ techniques: evidence of two redox processes

2005 ◽  
Vol 576 (1) ◽  
pp. 139-145 ◽  
Author(s):  
H.J. Salavagione ◽  
J. Arias-Pardilla ◽  
J.M. Pérez ◽  
J.L. Vázquez ◽  
E. Morallón ◽  
...  
Keyword(s):  
Redox Processes ◽  
Redox Mechanism ◽  
In Situ Techniques
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