Orientational Control over Nitrite Reductase on Modified Gold Electrode and Its Effects on the Interfacial Electron Transfer

2011 ◽  
Vol 115 (43) ◽  
pp. 12607-12614 ◽  
Author(s):  
Łukasz Krzemiński ◽  
Samuel Cronin ◽  
Lionel Ndamba ◽  
Gerard W. Canters ◽  
Thijs J. Aartsma ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Nitrite Reductase ◽  
Gold Electrode ◽  
Interfacial Electron Transfer

Spectroelectrochemical Investigation of Intramolecular and Interfacial Electron-Transfer Rates Reveals Differences Between Nitrite Reductase at Rest and During Turnover

2011 ◽  
Vol 133 (38) ◽  
pp. 15085-15093 ◽  
Author(s):  
Łukasz Krzemiński ◽  
Lionel Ndamba ◽  
Gerard W. Canters ◽  
Thijs J. Aartsma ◽  
Stephen D. Evans ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Nitrite Reductase ◽  
Interfacial Electron Transfer ◽  
Transfer Rates

Comparison of Gold and Platinum Electrode Responses in Activated Sludge

1993 ◽  
Vol 28 (11-12) ◽  
pp. 473-480
Author(s):  
A. Heduit ◽  
B. Martin ◽  
I. Duchamp ◽  
D. R. Thevenot
Keyword(s):  
Electron Transfer ◽  
Activated Sludge ◽  
Gold Electrode ◽  
Platinum Electrode ◽  
Electrochemical Determination ◽  
Exchange Current ◽  
Experimental Conditions ◽  
Equilibrium Exchange ◽  
Prolonged Contact ◽  
Current Densities

Gold and platinum were compared to ascertain how they expressed a stabilized potential in activated sludge. The comparison was based on electrochemical determination of the electron transfer rate (i.e. equilibrium exchange current density) and recording of potentials against time. When both metals are treated in the same way, platinum gives equilibrium exchange current densities approx. 10 times higher than gold, both in aerated activated sludge and in treated water. For platinum, the equilibrium exchange current densities range from 0.1 to 0.25 µA/cm2 immediately after polishing and decrease during prolonged contact with activated sludge subjected to alternating aeration/anoxia sequences. The lower kinetics of electron transfer on gold go together with significant differences in response:- In an aerobic medium a gold electrode potential is lower than that of a platinum electrode. In a strongly anaerobic medium, the reverse is true. Consequently, the amplitude of the potential variation between aerobic and anaerobic media is smaller for gold than for platinum. Under our experimental conditions this amplitude was approx 350 mV for gold and 850 mV for platinum.- The slopes of the linear relationships between potential and pH or potential and the logarithm of the dissolved oxygen concentration are two or three times greater for platinum than for gold. Although the values obtained with platinum electrodes cannot represent a veritable equilibrium state, the platinum electrode zero-current potential would seem to be far more sensitive to variations in the medium than that of the gold electrode; it is, therefore, more suitable for use in activated sludge.

A Comparison between Interfacial Electron-Transfer Rate Constants at Metallic and Graphite Electrodes

2006 ◽  
Vol 110 (39) ◽  
pp. 19433-19442 ◽  
Author(s):  
William J. Royea ◽  
Thomas W. Hamann ◽  
Bruce S. Brunschwig ◽  
Nathan S. Lewis
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Transfer Rate ◽  
Interfacial Electron Transfer ◽  
Electron Transfer Rate ◽  
Graphite Electrodes

Autonomous Control of Interfacial Electron Transfer and the Activation of DNA Machines by an Oscillatory pH System

Nano Letters ◽  
2013 ◽  
Vol 13 (10) ◽  
pp. 4920-4924 ◽  
Author(s):  
Xiu-Juan Qi ◽  
Chun-Hua Lu ◽  
Xiaoqing Liu ◽  
Simcha Shimron ◽  
Huang-Hao Yang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Autonomous Control ◽  
Interfacial Electron Transfer ◽  
Dna Machines
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