Journal
ELECTROCHIMICA ACTA
Volume 400, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139435
Keywords
Rhodium nanoparticles; Catalyst degradation; Identical location SEM; TEM; ICP-MS
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Funding
- Ministry of Education, Science and Sport of the Republic of Slovenia [Raziskovalci-2.1-KI-952007]
- Slovenian Research Agency [P1-0034, P2-0393, N2-0106]
- NATO Science for Peace and Security Programme [G5729]
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The electrochemical stability of a commercial Rh/C catalyst in an acidic electrolyte was studied using accelerated degradation protocols. Results showed that Rh/C catalyst exhibited different stability levels in different potential regions, with sudden potential jumps between particularly low and high values causing severe degradation.
Electrochemical stability of a commercial Rh/C catalyst has been studied in an acidic electrolyte by accelerated degradation protocols (ADP) which involved 5000 rapid voltammetric scans (1 V/s) in two potential regions: ADP1 was performed between 0.4 V-RHE and 1.4 V-RHE, while ADP2 was performed between 0.05 V-RHE and 1.4 V-RHE. Degradation of Rh/C was monitored by the changes in Rh electrochemical surface area (ECSA) and electrocatalytic activity for hydrogen evolution (HER) and oxygen reduction (ORR). Rh/C catalyst was particularly stable during ADP1 showing only a minor loss of ECSA, while its electrocatalytic activity for HER and ORR was practically unaffected, which was further corroborated with identical location SEM (IL-SEM) imaging. In the case of ADP2, severe degradation of Rh/C occurred followed by substantial decay in its electrocatalytic activity. Coupling of the electrochemical flow cell (EFC) with ICP-MS revealed much higher Rh dissolution in ADP2 than in ADP1. IL-SEM in combination with ex-situ TEM imaging showed that degradation of the Rh/C sample is not homogeneous during ADP2, as dissolution prevails on certain locations, while dissolution followed by re-deposition occurs on others. According to the results obtained in this work, Rh/C catalysts are exceptionally sensitive to the sudden potential jumps between particularly low and high values. (C) 2021 Elsevier Ltd. All rights reserved.
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