1 research outputs found
Standardized Benchmarking of Water Splitting Catalysts in a Combined Electrochemical Flow Cell/Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES) Setup
The
oxygen evolution reaction (OER) is the limiting step in splitting
water into its constituents, hydrogen and oxygen. Hence, research
on potential OER catalysts has become the focus of many studies. In
this work, we investigate capable OER catalysts but focus on catalyst
stability, which is, especially in this case, at least equally as
important as catalyst activity. We propose a specialized setup for
monitoring the corrosion profiles of metal oxide catalysts during
a stability testing protocol, which is specifically designed to standardize
the investigation of OER catalysts by means of differentiating between
catalyst corrosion and deactivation, oxygen evolution efficiency,
and catalyst activity. For this purpose, we combined an electrochemical
flow cell (EFC) with an oxygen sensor and an inductively coupled plasma–optical
emission spectrometry (ICP-OES) system for the simultaneous investigation
of catalyst deactivation, activity, and faradaic efficiency of catalysts.
We tested various catalysts, with IrO<sub>2</sub> and NiCoO<sub>2</sub> used as benchmark materials in acidic and alkaline environment,
respectively. The scalability of our setup will allow the user to
investigate catalytic materials with supports of higher surface area
than those which are typical for microelectrochemical flow cells (thus,
under conditions more similar to those of commercial electrolyzers)