Redox mediators as charge agents for changing electrochemical reactions

2020 ◽  
Vol 49 (20) ◽  
pp. 7454-7478 ◽  
Author(s):  
Andebet Gedamu Tamirat ◽  
Xuze Guan ◽  
Jingyuan Liu ◽  
Jiayan Luo ◽  
Yongyao Xia
Keyword(s):  
Reaction Kinetics ◽  
Electrochemical Reactions ◽  
Redox Mediators ◽  
Electrochemical Systems ◽  
Comprehensive Discussion

This review provides a comprehensive discussion toward understanding the effects of RMs in electrochemical systems, underlying redox mechanisms, and reaction kinetics both experimentally and theoretically.

Porous biochar nanosheets loaded with Fe3C particles accelerate electrochemical reactions and their applications in Li-S Battery

2021 ◽  
Author(s):  
Xuri Wang ◽  
Yawen Zhang ◽  
Qihong Chang ◽  
Yaqin Wu ◽  
Weixin Lei ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Electrochemical Reactions ◽  
Preparation Process ◽  
Fast Reaction ◽  
Lithium Sulfur Battery ◽  
Simple Preparation ◽  
Strong Adsorption ◽  
Sulfur Battery ◽  
Lithium Sulfur

Abstract Reasonable design of matrix with strong adsorption for polysulfides, fast reaction kinetics and simple preparation process is an urgent need for lithium-sulfur battery (Li-S battery) applications. Therefore, in this...

scholarly journals A review of asymmetric synthetic organic electrochemistry and electrocatalysis: concepts, applications, recent developments and future directions

2019 ◽  
Vol 15 ◽  
pp. 2710-2746 ◽  
Author(s):  
Munmun Ghosh ◽  
Valmik S Shinde ◽  
Magnus Rueping
Keyword(s):  
Electrochemical Reactions ◽  
Inherent Safety ◽  
Atom Economy ◽  
Organic Transformations ◽  
Future Directions ◽  
Organic Electrochemistry ◽  
Recent Developments ◽  
Comprehensive Discussion

The direct exploitation of ‘electrons’ as reagents in synthetic organic transformations is on the verge of a renaissance by virtue of its greenness, sustainability, atom economy, step economy and inherent safety. Achieving stereocontrol in such organic electrochemical reactions remains a major synthetic challenge and hence demands great expertise. This review provides a comprehensive discussion of the details of stereoselective organic electrochemical reactions along with the synthetic accomplishments achieved with these methods.

Electrochemical nucleation and growth of copper on iron and aluminum: A TEM study of industrial copper cementation

1978 ◽  
Vol 36 (1) ◽  
pp. 454-455
Author(s):  
L.E. Murr ◽  
V. Annamalai
Keyword(s):  
Metal Surface ◽  
Copper Deposit ◽  
Nucleation And Growth ◽  
16Th Century ◽  
Electrochemical Reactions ◽  
Mine Shaft ◽  
De Re ◽  
Copper Precipitation ◽  
Electrochemical Nucleation ◽  
Interesting System

Georgius Agricola in 1556 in his classical book, “De Re Metallica”, mentioned a strange water drawn from a mine shaft near Schmölnitz in Hungary that eroded iron and turned it into copper. This precipitation (or cementation) of copper on iron was employed as a commercial technique for producing copper at the Rio Tinto Mines in Spain in the 16th Century, and it continues today to account for as much as 15 percent of the copper produced by several U.S. copper companies.In addition to the Cu/Fe system, many other similar heterogeneous, electrochemical reactions can occur where ions from solution are reduced to metal on a more electropositive metal surface. In the case of copper precipitation from solution, aluminum is also an interesting system because of economic, environmental (ecological) and energy considerations. In studies of copper cementation on aluminum as an alternative to the historical Cu/Fe system, it was noticed that the two systems (Cu/Fe and Cu/Al) were kinetically very different, and that this difference was due in large part to differences in the structure of the residual, cement-copper deposit.

Study of C2H5O2 using modulated photolysis: ultra-violet spectrum and self-reaction kinetics in the temperature range 233-363 K

1997 ◽  
Vol 94 ◽  
pp. 484-502
Author(s):  
S Fauvet ◽  
JP Ganne ◽  
J Brion ◽  
D Daumont ◽  
J Malicet ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Ultra Violet ◽  
Temperature Range

SYNTHESIS AND REACTION KINETICS STUDY OF TRI PHENYL PHOSPHITE

2019 ◽  
Vol 2 (2) ◽  
pp. 99-106
Author(s):  
Satish M. Mane ◽  
M. Praharaj Bhatnagar ◽  
M. R. Sawant ◽  
B. N. Thorat
Keyword(s):  
Reaction Kinetics ◽  
Kinetics Study

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

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