Projects per year
Abstract
A generator-collector "nano-litre cavity" based on two opposed platinum-coated gold film electrodes with 19 μm gap and either 38 μm or 83 μm depth is employed for the titration of protons and/or hydrogen. Diffusional feedback currents between generator and collector electrode in a platinum-platinum dual-plate sensor configuration provide a sensitive analytical tool for cycleable redox systems, here, the proton/hydrogen redox system in the presence of oxygen. Experimental data are compared with the theoretical expression proposed by Hubbard and Peters (A.T. Hubbard, D.G. Peters, Critical Reviews in Analytical Chemistry, 1973, 3, 201-242) suggesting a dominating transport effect of "slow diffusers". Good agreement is observed even at relatively high proton concentrations where hydrogen bubble nucleation within the micro-trench starts to occur. Low concentration measurements are strongly affected by oxygen reduction locally consuming/depleting protons. Catalytic activity of the platinum deposit is crucial for maximising the current output.
Original language | English |
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Pages (from-to) | 94-100 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 125 |
DOIs | |
Publication status | Published - 10 Apr 2014 |
Fingerprint
Dive into the research topics of 'Nano-litre proton/hydrogen titration in a dual-plate platinum-platinum generator-collector electrode micro-trench'. Together they form a unique fingerprint.Projects
- 1 Finished
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Nanogap Electrochemistry and Sensor Technology at the Molecular Limit
Marken, F. (PI)
Engineering and Physical Sciences Research Council
1/11/11 → 30/04/15
Project: Research council
Profiles
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Sara Dale
- Department of Physics - Royal Society Research Fellow
- Condensed Matter Physics CDT
- Centre for Nanoscience and Nanotechnology
- Institute of Sustainability and Climate Change
- Condensed Matter and Quantum Materials
- NanoBioEletronics
Person: Core staff, Researcher
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Frank Marken
- Department of Chemistry - Professor
- Institute for Sustainable Energy and the Environment
- Centre for Sustainable Chemical Technologies (CSCT)
- Water Innovation and Research Centre (WIRC)
- Centre for Nanoscience and Nanotechnology
- IAAPS: Propulsion and Mobility
- Centre for Bioengineering & Biomedical Technologies (CBio)
- Institute of Sustainability and Climate Change
Person: Research & Teaching, Affiliate staff
Equipment
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MC2-Electron Microscopy (EM)
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type