Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes

Journal Article · Sun Jun 30 00:00:00 EDT 2019 · Journal of Visualized Experiments

DOI:https://doi.org/10.3791/59553· OSTI ID:1593564

Ivanovskaya, Anna N. ^[1]; Belle, Anna M. ^[1]; Yorita, Allison M. ^[1]; Qian, Fang ^[1]; Chen, Supin ^[1]; Tooker, Angela C. ^[1]; Garcia Lozada, Rose ^[1]; Dahlquist, Dylan ^[1]; Tolosa, Vanessa M. ^[1]

---

1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

This protocol demonstrates a method for electrochemical roughening of thin-film platinum electrodes without preferential dissolution at grain boundaries of the metal. Using this method, a crack free, thin-film macroelectrode surface with up to 40 times increase in active surface area was obtained. The roughening is easy to do in a standard electrochemical characterization laboratory and incudes the application of voltage pulses followed by extended application of a reductive voltage in a perchloric acid solution. The protocol includes the chemical and electrochemical preparation of both a macroscale (1.2 mm diameter) and microscale (20 µm diameter) platinum disc electrode surface, roughening the electrode surface and characterizing the effects of surface roughening on electrode active surface area. This electrochemical characterization includes cyclic voltammetry and impedance spectroscopy and is demonstrated for both the macroelectrodes and the microelectrodes. Finally, roughening increases electrode active surface area, decreases electrode impedance, increases platinum charge injection limits to those of titanium nitride electrodes of same geometry and improves substrates for adhesion of electrochemically deposited films.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1593564
• Report Number(s): LLNL-JRNL--762701; 951592
• Journal Information: Journal of Visualized Experiments, Journal Name: Journal of Visualized Experiments Vol. 148; ISSN 1940-087X
• Publisher: MyJoVE Corp.
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
biosensor
electrical stimulation
electrochemical roughening
electrophysiology
high surface area electrode
microelectrode
neural stimulation
neuromodulation
platinum