Visualization of electrocatalytic activity of microstructured metal hexacyanoferrates by means of redox competition mode of scanning electrochemical microscopy (RC-SECM)

Guadagnini, Lorella; Maljusch, Artjom; Chen, Xingxing; Neugebauer, Sebastian; Tonelli, Domenica; Schuhmann, Wolfgang

doi:10.1016/j.electacta.2009.01.076

Cited by 40 publications

(27 citation statements)

References 31 publications

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“…Control of the tip-to-sample distance was performed using a software based tilt correction procedure described elsewhere. 5 Figure 6 (bottom) shows a line scan over the marked sample area from the W coated area to the Pt coated area performed by means of the RC-SECM. Two areas with different catalytic activity toward the ORR are clearly visible.…”

Section: Analytical Chemistrymentioning

confidence: 99%

Integrated Scanning Kelvin Probe-Scanning Electrochemical Microscope System: Development and First Applications

Maljusch¹,

Schönberger

Lindner³

et al. 2011

Anal. Chem.

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The integration of a scanning Kelvin probe (SKP) and a scanning electrochemical microscope (SECM) into a single SKP-SECM setup, the concept of the proposed system, its technical realization, and first applications are presented and discussed in detail. A preloaded piezo actuator placed in a grounded stainless steel case was used as the driving mechanism for oscillation of a Pt disk electrode as conventionally used in SECM when the system was operated in the SKP mode. Thus, the same tip is recording the contact potential difference (CPD) during SKP scanning and is used as a working electrode for SECM imaging in the redox-competition mode (RC-SECM). The detection of the local CPD is established by amplification of the displacement current at an ultralow noise operational amplifier and its compensation by application of a variable backing potential (V(b)) in the external circuit. The control of the tip-to-sample distance is performed by applying an additional alternating voltage with a much lower frequency than the oscillation frequency of the Kelvin probe. The main advantage of the SKP-SECM system is that it allows constant distance measurements of the CPD in air under ambient conditions and in the redox-competition mode of the SECM in the electrolyte of choice over the same sample area without replacement of the sample or exchange of the working electrode. The performance of the system was evaluated using a test sample made by sputtering thin Pt and W films on an oxidized silicon wafer. The obtained values of the CPD correlate well with known data, and the electrochemical activity for oxygen reduction is as expected higher over Pt than W.

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Section: Analytical Chemistrymentioning

confidence: 99%

Integrated Scanning Kelvin Probe-Scanning Electrochemical Microscope System: Development and First Applications

Maljusch¹,

Schönberger

Lindner³

et al. 2011

Anal. Chem.

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“…Electrochemical modification with PB was achieved by cycling the potential between 0.4 and 0.8 V for PB deposition [27]. For GOx immobilisation, 20 μL of a mixture of 2.5 mg GOx in 70 μL Resydrol solution (Resydrol to water 1:1) diluted with 430 μL PBS was drop coated onto the BE surface and allowed to dry for 2 h at room temperature.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…Prussian blue (PB)-based glucose sensors allow for catalytic reduction of enzymatically produced H 2 O 2 at low applied potentials [19][20][21] with good detection limit and sensitivity [22][23][24][25][26]. Our group previously reported on a PB-based glucose sensor in combination with scanning electrochemical microscopy (SECM) [27]. The SECM tip and a locally PB-modified sample surface were competing for H 2 O 2 that had been produced by a layer of GOx covering the PB spot.…”

Section: Introductionmentioning

confidence: 99%

Linking glucose oxidation to luminol-based electrochemiluminescence using bipolar electrochemistry

Eßmann

Jambrec

Kuhn

et al. 2015

Electrochemistry Communications

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“…To promote clearer differences between ZrO 2 and Pr x Zr 1−x O 2 specimens, a strategy where the tip competes with the substrate for the very sample analyte, equivalent to that termed redox competition scanning electrochemical microscopy, recently employed by several authors[66,67], was used. Under the conditions in…”

mentioning

confidence: 99%

Electrochemical characterization of praseodymium centers in Pr x Zr1−x O2 zirconias using electrocatalysis and photoelectrocatalysis

Doménech

Montoya

Alarcón

2011

J Solid State Electrochem

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The voltammetry of nanoparticles and scanning electrochemical microscopy are applied to characterize praseodymium centers in tetragonal and monoclinic zirconias, doped with praseodymium ions (Pr x Zr 1−x O 2 ), prepared via sol-gel routes. Doped zirconia nanoparticles were synthesized by a sol-gel liquid-phase route and characterized by different techniques, including X-ray diffraction powder pattern, ultraviolet-visible diffuse reflectance spectroscopy, infrared spectroscopy, and transmission electron microscopy (TEM). Gels annealed at around 400°C yielded tetragonal Pr x Zr 1−x O 2 phases. The monoclinic forms of Pr-doped ZrO 2 were obtained by annealing at temperatures higher than 1,100°C. TEM micrographs proved that the size of the nanoparticles produced was dependent on their crystalline form, around 15 and 60 nm for tetragonal and monoclinic, respectively. The electrochemical study confirmed that a relatively high content of praseodymium cation was in the chemical state (IV), i.e., as Pr 4+ , in both zirconia host lattices. The catalytic and photocatalytic effects of Pr 4+ centers located in the monoclinic zirconia lattice on nitrite reduction and oxygen evolution reaction were studied.

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Visualization of electrocatalytic activity of microstructured metal hexacyanoferrates by means of redox competition mode of scanning electrochemical microscopy (RC-SECM)

Cited by 40 publications

References 31 publications

Integrated Scanning Kelvin Probe-Scanning Electrochemical Microscope System: Development and First Applications

Integrated Scanning Kelvin Probe-Scanning Electrochemical Microscope System: Development and First Applications

Linking glucose oxidation to luminol-based electrochemiluminescence using bipolar electrochemistry

Electrochemical characterization of praseodymium centers in Pr x Zr1−x O2 zirconias using electrocatalysis and photoelectrocatalysis

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