Episode #122: Ni foam as a substrate, what if it contributes to HER/OER?

This is a Livestream Q&A/Ask Us Anything for answering YOUR questions on YouTube. In this Q&A session we will answer your electrochemistry research questions LIVE, as well as any other questions related personal topics like careers, academia, industry, or life in general. We have compiled a database of all questions asked in our Ask Us Anything About Electrochemistry Livestreams, tagged by the question subject and linked with time stamps to the place in that week's Livestream. If you are interested in obtaining a copy of this database (MS Excel file), please reach out via comments here or directly to us at [email protected]. Check out https://aftermathlive.com, Pine Research's online electrochemical simulation software! Perfect for the classroom or research lab, licenses are available for simulating CV and bulk electrolysis of a variety of chemical and electrochemical reactions. Accessible on both PC and Mac! Time stamps: 00:00 - Introduction 05:58 - Livestream starts 09:34 - Discussion about thermoneutral potential 27:20 - A lot of literature uses Ni foam as a substrate, which itself shows significant current and lower overpotential compared with glassy carbon or Toray paper. What is the proper way to report HER and OER values using Ni foam? Also, is iR correction really necessary? 36:23 - I've done EIS for a fuel cell and a porous electrode, and the spectrum shows a 45 degree angle at high frequency. Should I fit this with a classic Randles circuit or can I use a transmission line model? 46:10 - Why do I see impedance drop as temperature in my battery goes to 50-60 degrees, but when testing hotter the impedance often rises again and doesn't continue to drop? 1:01:26 - Could you explain the physical meaning of the real and imaginary components of EIS? And what does it mean if the Warburg part is not exactly 45 degrees? 1:15:20 - What if I know the electrodes in my system are porous but the EIS spectrum looks more like a classical Randles circuit? Should I use the simpler circuit to fit the data? 1:20:55 - In a galvanic cell, why do we use the convention for anode and cathode with negative and positive labels? 1:32:11 - How much, and in what way, does mass transfer affect an electroreduction reaction? 1:36:52 - What is the physical meaning for an increase in cathodic current associated with SEI in CV, and upon using additives, is it beneficial or detrimental? 1:48:05 - Why do researchers perform partial compensation (like 80-85%) for uncompensated resistance using a potentiostat, and not 100%? 1:50:01 - What are advantages and disadvantages of different rotator methods like RDE, RCE, and RRDE? 1:55:22 - Potentiostat oscillation is the given reason for not overcompensating, but why does the potentiostat oscillate at all?