## Problem – Number of Electrons?

This is a fun-to-solve problem taken from Ayres, G. H. Quantitative Chemical Analysis, 2nd ed.; Harper & Row: New York, 1968. Let’s solve it! Problem (26-9). For a certain half reaction: Ox1 + ne– ⇌ Red1          E˚1 = +0.23 V       (1) For another half reaction: Ox2 + 2e– ⇌ Red2     […]

## Problem – SECM

This is another of my favorite echem problems, edited from Bard, A. J.; Faulkner, L.R.; Electrochemical methods: fundamentals and applications; Wiley: New York, 2001. Let’s solve it ! Assume that one molecule of a species R, reversibly oxidizable to O, is trapped between an SECM tip and a substrate located 10 nm from the tip. Assume also that […]

## Problem – Redox Potentials

This is one of my favorite echem problems, edited from Bard, A. J.; Faulkner, L.R.; Electrochemical methods: fundamentals and applications; Wiley: New York, 2001. Let’s solve it ! Consider each of the following electrode solution interfaces: Pt/Cu2+ (0.01 M), Cd2+ (0.01 M), H2SO4 (1M) Pt/Sn2+ (0.01 M), Sn4+ (0.01 M), HCl (1M) Hg/Cd2+ (0.01 M), Zn2+ (0.01 M), HCl (1M) Write […]

## At the Intersection of Two Phases

Have you ever wondered what the liquid – solid interface between an SECM tip and a solution of ferrocenemethanol ( FcMeOH ) looks like? Of course you have ! (if you are an echem-nerd like me). In this post I share a picture of an SECM Pt nano tip ( disk radius = 200 nm, RG = 3.0 ), […]

## Picture of an SECM Nano Tip

Science and technology have progressed so much in the last 50 years that we now have instruments to observe and manipulate materials at the nano scale. Just to give a reference, one nanometer is approximately 100,000 times smaller than the width of a human hair. So, we are able to observe and manipulate stuff that […]