Our first Nano Detection System (NDS 10) is up and running in the Institute of Process Engineering at the Chinese Academy of Sciences.
The system is used for high-speed threshold experiments in the field of nanoelectrochemistry.
In the training session with our application scientist the formation of hydrogen nanobubbles at a platinum nanoelectrode was in the center of attention.
The experiments were performed in galvanostatic mode where a current pulse at the nanoelectrode drives the formation of hydrogen nanobubbles. The experiment is feedback-controlled and the current is set back to 0 nA upon reaching a predefined threshold which represents the start of nanobubble formation (here set to -0.85 V). The threshold detection is high-speed and takes only 10 µs. The current is set back within 50 µs. From the potential response valuable information such as nucleation rate can be extracted.
The experiments were performed according to this publication: German, S.R., Edwards, M.A., Ren, H. and White, H.S., 2018. Critical nuclei size, rate, and activation energy of H2 gas nucleation. Journal of the American Chemical Society, 140(11), pp.4047-4053.