Fabrication of Carbon-Platinum Interdigitated Array Electrodes and Their Application for Investigating Homogeneous Hydrogen Evolution Catalysis

Abstract

Interdigitated array electrodes (IDAEs) with one carbon electrode and the other platinum electrode were constructed by electrodepositing platinum on one set of the carbon electrodes. Platinum deposition was confirmed by scanning electron microscope (SEM) and cyclic voltammetry. The width of the carbon and platinum digits is less than 2 μm and the gap between two adjacent digits is around 3 μm. The carbon-platinum IDAEs benefit from the characteristics of both carbon and platinum in that carbon can provide a wide nonreactive potential window while platinum is a good catalyst for hydrogen reactions making it useful to characterize the catalytic hydrogen production cycle of the molecular electrocatalyst [Ni(P Ph 2 N Ph 2 ) 2 (CH 3 CN)](BF 4 ) 2 (where P Ph 2 N Ph 2 is 1,3,5,7tetraphenyl-1,5-diaza-3,7-diphosphacyclooctane). With properly set potentials, the molecular electrocatalyst was reduced at the carbon digits to initiate a homogeneous H 2 production reaction while the platinum digits detect the H 2 by oxidation, providing direct evidence of its production rate from the catalytic cycles.

An Electrochemical Method for Fast and Controlled Etching of Fluorine-Doped Tin Oxide Coated Glass Substrates

“…Such electrodes are used in solar cell module development, sensor and other related applications. [12][13][14] For patterning FTO, masks were printed using a laser printer on glossy paper and were transferred to FTO by heat and pressure treatment. As our method is an electrochemical process, it is possible to pattern any design.…”

Micro and Nano Interdigitated Electrode Array (IDEA)-Based MEMS/NEMS as Electrochemical Transducers: A Review

“…The combination of metal and carbon in IDEA have proved enhancement of the collection efficiency of IDEA-based electrochemical sensors. A follow-up study by Liu et al [ 120 ] compared the CV performance of the carbon–platinum IDEA (C-Pt IDEA) with a carbon–carbon IDEA (C-C IDEA) [ 119 ], using homogeneous catalytic production of hydrogen (H 2 ) as the test redox system [ 120 ]. The width of the carbon generator electrode was 2 μm (slightly wider because of overplating of the Pt), and the gap between two adjacent fingers was 3 μm.…”

“…Another challenge is the weak adhesion interface between the carbon layer and the substrate [ 45 , 195 , 197 ]. From this review, the integration of carbon and metal for IDEA’s electrode has been explored for a better sensor performance [ 120 , 168 ] to ultimately achieve a higher amplification factor and collection efficiency and lower limits of detection while maintaining the miniaturized size of IDEA-based sensors.…”

Photoelectrochemical oxygen evolution with interdigitated array electrodes: the example of TiO2

“…The deposited samples were then annealed at 550 °C in Ar for 1 h to enhance the adhesion of TiO 2 with the substrate. The deposition of Pt on IDA collector was performed by cyclic sweeping between 1.16 V and −0.2 V versus Ag/AgCl for 2 cycles in a 0.1 M of HClO 4 aqueous solution containing 2 mM K 2 PtCl 6 as a Pt source [41].…”