Benchmarking the Stability of Oxygen Evolution Reaction Catalysts: The Importance of Monitoring Mass Losses
Artikel i vetenskaplig tidskrift, 2014
Because of the rising need for energy storage, potentially facilitated
by electrolyzers, improvements to the catalysis of the
oxygen evolution reaction (OER) become increasingly relevant.
Standardized protocols have been developed for determining
critical figures of merit, such as the electrochemical surface
area, mass activity and specific activity. Even so, when new and
more active catalysts are reported, the catalyst stability tends
to play a minor role. In this work, we monitor corrosion on
RuO2 and MnOx by combining the electrochemical quartz crystal
microbalance (EQCM) with inductively coupled plasma mass
spectrometry (ICP–MS). We show that a meaningful estimation
of the stability cannot be achieved based on purely electrochemical
tests. On the catalysts tested, the anodic dissolution
current was four orders of magnitude lower than the total current.
We propose that even if long-term testing cannot be replaced,
a useful evaluation of the stability can be achieved
with short-term tests by using EQCM or ICP–MS.