The authors developed a kind of all solid-state battery with high capacity. They use a nano-composite of sulfur and AB (acetylene black) as the electrode and obtain the large reversible capacity of 900 mAh/g with the current densities of 0.013 mAcm−2. The authors attribute the extremely high capacity of the composite electrode to a close contact between sulfur and AB which acts as conducting matrix.
The authors study the oxidation of formic acid at a platinum electrode in acid media, in particular the oscillatory behavior of the potential when operating under galvanostatic conditions (constant current). These oscillations, as suggested, indicate a complex interaction between adsorbed intermediates from the oxidation of formic acid and oxygen species present at the potentials used (higher than 0.8 V vs NHE). A nice thing is that they can follow these oscillations through the use of a Quartz Microbalance, which somehow proves their point of an interaction on the surface of the electrode. An interesting part in my opinion is that they suggest that current spikes, often seen in these type of systems when working under potentiostatic control, may be correlated to the oscillating behavior. Typically we work under potentiostatic control and may be tempted to discard such phenomena, specially if not reproducible, so perhaps this article is providing us with a valuable observation.
Use of FT-ac voltammetry showed premonolayer oxidation of Au electrodes rather than the accepted double layer charging and monolayer oxide formation. These findings were applied to electrocatalysis of hydrazine, ethylene glycol, and glucose. They also bear on the incipient hydrous oxide adatom mediator model of electrocatalysis.
SECM was used to measure the conductivity of a film of monolayer protected clusters (MPC) of Au nanoparticles on glass. The conductance was a function of the redox potential of the film (see Figure 4), controlled by using two different mediators, FcMeOH and FcTMA, and varying concentrations. A model is proposed for this behavior showing two maxima at the formal potentials of the two mediator couples, which sort of fit the experimental data.
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