Operation Mechanism of Organic Electrochemical Transistors as Redox Chemical Transducers

2021 ◽  
Author(s):  
Siew Ting Melissa Tan ◽  
Scott Keene ◽  
Alexander Giovannitti ◽  
Armantas Melianas ◽  
Maximilian Moser ◽  
...  
Keyword(s):  
Charge Density ◽  
Operation Mechanism ◽  
Density Dependent ◽  
Redox Active ◽  
Electrochemical Redox ◽  
Redox Sensors ◽  
Mixed Ionic Electronic Conductors ◽  
Chemical Transducers ◽  
Electronic Conductors ◽  
Organic Electrochemical Transistors

The ability to control the charge density of organic mixed ionic electronic conductors (OMIECs) via reactions with redox-active analytes has enabled applications as electrochemical redox sensors. Their charge density-dependent conductivity...

scholarly journals High Performance Reduction/Oxidation Metal Oxides for Thermochemical Energy Storage (PROMOTES)

2016 ◽  
Author(s):  
James E. Miller ◽  
Andrea Ambrosini ◽  
Sean M. Babiniec ◽  
Eric N. Coker ◽  
Clifford K. Ho ◽  
...  
Keyword(s):  
Energy Storage ◽  
Metal Oxides ◽  
High Performance ◽  
Electricity Production ◽  
Power Cycles ◽  
Redox Active ◽  
Active Metal ◽  
Performance Reduction ◽  
Mixed Ionic Electronic Conductors ◽  
Electronic Conductors

Thermochemical energy storage (TCES) offers the potential for greatly increased storage density relative to sensible-only energy storage. Moreover, heat may be stored indefinitely in the form of chemical bonds via TCES, accessed upon demand, and converted to heat at temperatures significantly higher than current solar thermal electricity production technology and is therefore well-suited to more efficient high-temperature power cycles. The PROMOTES effort seeks to advance both materials and systems for TCES through the development and demonstration of an innovative storage approach for solarized Air-Brayton power cycles and that is based on newly-developed redox-active metal oxides that are mixed ionic-electronic conductors (MIEC). In this paper we summarize the system concept and review our work to date towards developing materials and individual components.

ChemInform Abstract: Crystal Chemistry and Properties of Mixed Ionic-Electronic Conductors

ChemInform ◽  
2012 ◽  
Vol 43 (28) ◽  
pp. no-no
Author(s):  
Arumugam Manthiram ◽  
Jung-Hyun Kim ◽  
Young Nam Kim ◽  
Ki-Tae Lee
Keyword(s):  
Crystal Chemistry ◽  
Mixed Ionic Electronic Conductors ◽  
Electronic Conductors

Reply to the ‘Comment on “How to interpret Onsager cross terms in mixed ionic electronic conductors”’ by H.-I. Yoo, M. Martin, and J. Janek, Phys. Chem. Chem. Phys., 2015,7, DOI: 10.1039/C4CP05737F

2015 ◽  
Vol 17 (16) ◽  
pp. 11107-11108 ◽  
Author(s):  
I. Riess
Keyword(s):  
Chem Phys ◽  
Cross Terms ◽  
Mixed Ionic Electronic Conductors ◽  
Electronic Conductors ◽  
Phys Chem Chem Phys

The Onsager cross terms are re-examined. Two experiments are suggested to test which of two alternative explanations for these terms is valid.

Charge-Density-Dependent Partitioning of Cs+and K+into Nickel Hexacyanoferrate Matrixes

Langmuir ◽  
2002 ◽  
Vol 18 (9) ◽  
pp. 3620-3625 ◽  
Author(s):  
Kavita M. Jeerage ◽  
William A. Steen ◽  
Daniel T. Schwartz
Keyword(s):  
Charge Density ◽  
Nickel Hexacyanoferrate ◽  
Density Dependent

scholarly journals Operation Mechanism of Organic Electrochemical Transistors as Redox Chemical Transducers

2021 ◽  
Author(s):  
Siew Ting Melissa Tan ◽  
Scott Tom Keene ◽  
Alexander Giovannitti ◽  
Armantas Melianas ◽  
Maximilian Moser ◽  
...  
Keyword(s):  
Large Fraction ◽  
Drain Current ◽  
Electrode Reaction ◽  
Redox Activity ◽  
Side Reactions ◽  
Chemical Detection ◽  
Reaction Cell ◽  
Electrode Potentials ◽  
Mixed Ionic Electronic Conductors ◽  
Organic Electrochemical Transistors

<p>There is intense interest in utilizing the redox activity of Organic Mixed Ionic Electronic Conductors for faradaic chemical sensing. In particular, the investigation of organic electrochemical transistors (OECTs) as biosensors due to their low operational potentials, ease of fabrication (e.g. by inkjet printing), biocompatibility, and large transconductance. </p> <p>It has become common practice in the OECT community to combine both chemical detection and transistor function within the same compartment, assuming that the sensor signal is amplified seamlessly by the sensing OECT. These devices however routinely encounter several challenges whose origins often remained unclear. Some of these challenges are 1) small changes in drain current, contradicting OECT’s oft-touted current-amplifying abilities. 2) Irreversible chemical changes to the semiconducting polymer electrodes. 3) Parasitic side reactions convoluting the sensing signal, exacerbated by applied voltages.</p> <p>In this manuscript, we show that optimization of OECT-based sensors requires more rigorous characterization of electrode potentials to elucidate electrochemical phenomena, a practice that is often largely absent in current reports. Our analysis of fundamental device physics of various OECT architectures shows that despite what a large fraction of the organic bioelectronics community still believes, amperometric OECTs either 1) do not display any transistor behavior, and in fact operate merely as electrodes or 2) Undergo irreversible changes and are extremely complex to calibrate, or both 1) and 2). </p> <p>Indeed, to fully utilize the OECT’s large transconductance, a separate 2-electrode Reaction Cell which is utilized to gate a separate OECT is needed (RC-OECT). In this manuscript, in addition to showing that the RC-OECT resolves the fundamentally and irreconcilably contradicting design principles of amperometric OECTs, we demonstrate that it provides great device and materials design flexibility. Finally, we elucidate the basic principles on how to further optimize the RC-OECT.</p> <p>We believe that our findings will be of great interest to researchers in the fields of bioelectronics as a call to action to re-evaluate present approaches of utilizing OECTs for chemical detection and to help practitioners select materials and designs to optimize redox sensors based on organic semiconductors. </p>

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