Pyrolytic graphite electrode, voltammogram

Figure 24 Square wave voltammograms recorded at an edge-oriented pyrolytic graphite electrode in buffered aqueous solutions of [3Fe-4S] aconitase. (a) pH 6.2 (b) pH 7.5 (c) pH 8.2. Scan rate 0.1 V s ...

Figure 3. Cyclic voltammograms of a pyrolytic graphite electrode in pH 7 phosphate buffer following the listed reaction steps. Traces A-D correspond to the reaction steps cited in Fig. 2 and trace G corresponds to a control electrode produced by omitting step D before reacting with hydroxymethyl ferrocene. The potential scale is referenced to Ag/AgCl (saturated KCl). All traces were recorded with a 50 mV/s scan rate. (Reproduced from Ref. 64. Copyright 1978, American...

Fig. 5.4. Left Anaerobic cyclic voltammogram of 2.5 pmol (= one monolayer) P. versicolor laccase on pyrolytic graphite electrode.

Fig. 2. Cyclic voltammograms of horse heart cytochrome c at pyrolytic graphite electrodes 0,15 mM protein in 5 mM Tricine/100 mM NaCl, pH 8.0. Scan rate 20 mV sec. ...

Figure 5.8 Cyclic voltammogram (5mVs , 2500rpm) recorded for laccase adsorbed to (a) anthracene-modified and (b) unmodified pyrolytic graphite electrodes immediately following laccase deposition (black) and upon exchange of electrolyte (red). The inset shows...

Figure 14.3.3 Experimental and theoretical cyclic voltammograms for reduction and reoxidation of 9,10-phenanthrenequinone irreversibly adsorbed on a pyrolytic graphite electrode. Fq = 1.9 X 10 mol/cm i = 50 mV/s in 1 M HCIO4. (—) experimental...

Figure 23. Cyclic voltammogram of 1 mM uric acid in phosphate buffer, pH 7, at a pyrolytic graphite electrode. Sweep rate 200 mV s" ...

Figure 28. Cyclic voltammograms at a rough pyrolytic graphite electrode of (A) 200 fj,M uric acid in a solution contining 200 fiM H2O2, 0.5 M NaCl puls 5 mM Na2HP04, pH 7.5. Curve 1 shows initial sweep towards negative potentials. (B) Cyclic voltammogram of solution in (A) except 0.7 fiM type VIII peroxidase enzyme added. (C) Same as (B) except several minutes later. Sweep rate 200 mV s- ...

Fig. II.1.26 (a) Cyclic voltammogram [123] obtained in aqueous (0.1 M NaC104) media at 20°C for solid rran -[Cr(CO)2(dpe)2l mechanically attached to a polished basal plane pyrolytic graphite electrode (scan rate = 50 mV s ). (b) Schematic representation of redox processes at the interface between solid, electrode surface, and liquid electrolyte system...

Fig. 6. Cyclic voltammograms (fourth scan, 20 mVs" ) of horse cytochrome c at various types of pyrolytic graphite electrode. Protein is 0.15 mM in 5 mM Tricine and 0.10 M NaCI at pH 8. Temperature 20 °C. In each case the corresponding X-ray photo-electron spectrum of the graphite surface is shown. The scale enlargement for the O, peak is x 3...

Fig. 14. Differential pulse voltammograms of T2 bacteriophage DNA at the pyrolytic graphite electrode in 0.2 M sodium acetate, pH 6.4. (A) native DNA (B) thermally denatured DNA. DNA was at the concentration of 0.3 mg/ml.

Figure 1. A. Cyclic voltammograms recorded with a Nafion-coated pyrolytic graphite electrode containing 1.1 x 10" mole cm of sulfonate groups. The solid line was obtained witn the Nation coating alone the dashed line resulted after incorporation of 2.2 x 10" ° mole cm of CoP(py)4 in the coating.

Fig. 2.51 Forward and reverse square-wave voltammograms of myoglobin-didodecyldimethyl-ammonium bromide films on a basal plane pyrolytic graphite electrodes at 200 Hz frequency, 10 mV step height, and different pulse heights. Points are experimental data, and lines are best fits by nonlinear regression onto the Marcus model. Background currents are included in experimental and computed data. T = 37.0 =b 0.2 °C, and the supporting electrolyte is 20 mmol/L pH 6.0 phthalate buffer +180 mmol/L NaCl (reprinted from [78] with permission)...

FIGURE 12, In situ Mossbauer spectra of a 50% w/w Fe-enriched hydrated ferric oxide precipitated on Shawinigan black high-area carbon in the form of a Teflon-bonded electrode in 4 M KOH at (a) -0.3 V and (b) -1.1 V versus Hg/HgO, OH". Inset Cyclic voltammogram of the same, although nonenriched, material as in (a) in the form of a thin porous Teflon-bonded coating electrode deposited on an ordinary pyrolytic graphite electrode, in 4 M KOH. Scan rate 10 mV s" ... 

Typical cyclic voltammogram at 0.3mV/s of a hydrogenase film adsorbed at a pyrolytic graphite edge electrode immersed in a pH 9.00 hydrogen-saturated solution at 45°C and rotating... 

Figure 5 Cyclic voltammograms for trawi -[Ru (16-TMC)02](C104)2 ( 1 mM) in 0.1 M HCIO4 in MeCN. Conditions working electrode, pyrolytic graphite scan rate, 50 mV s. ...

Figure 10.2 Fe(CN) /4 voltammetry on glassy carbon (GC) fractured in solution, and on basal plane highly ordered pyrolytic graphite (HOPG). 1 mM K4Fe(CN)6 in 1 M KC1, scan rate = 0.2 V/s. AEp for fractured GC voltammogram = 64 mV, corresponding to k° > 0.1 cm/s, AEp for HOPG = 1005 mV, k° = 1 x 10 6 cm/s. Potential scale is relative to silver quasi-reference electrode.

Fig. 5.137. Cyclic voltammogram and selected mass intensity vs. electrode potential curves measured during electrooxidation of uric acid at pyrolytic graphite mje 157 = allantoine, m/c 167 = (uric acid - H) , 183 = imine alcohol, based on data in [856]...

Fig. 2 Reversible voltammograms for (top row) a diffusing redox couple reacting at a planar macroelectrode at which the entire surface is interactive (bottom row) a diffusing couple reacting at a microelectrode, or a macroelectrode at which most of the surface is blocked to protein interaction. Theoretical voltammograms are shown at the center, while the right hand side shows actual results obtained for cytochrome c at a polished pyrolytic graphite edge plane (top) or basal plane electrode, (bottom) showing the effect of the density of interactive sites on the electrode.

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