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.

Författare

Rasmus Frydendal

Danmarks Tekniske Universitet (DTU)

Elisa A. Paoli

Danmarks Tekniske Universitet (DTU)

Brian P. Knudsen

Danmarks Tekniske Universitet (DTU)

Björn Wickman

Chalmers, Teknisk fysik, Kemisk fysik

Paolo Malacrida

Danmarks Tekniske Universitet (DTU)

Ifan E. L. Stephens

Danmarks Tekniske Universitet (DTU)

Ib Chorkendorff

Danmarks Tekniske Universitet (DTU)

ChemElectroChem

2196-0216 (eISSN)

Vol. 1 12 2075-2081

Styrkeområden

Nanovetenskap och nanoteknik

Energi

Materialvetenskap

Ämneskategorier

Fysikalisk kemi

Atom- och molekylfysik och optik

DOI

10.1002/celc.201402262