20.500.12556/RUL-140636 Suppressing platinum electrocatalyst degradation via a high-surface-area organic matrix support Degradation of carbon-supported Pt nanocatalysts in fuel cells and electrolyzers hinders widespread commercialization of these green technologies. Transition between oxidized and reduced states of Pt during fast potential spikes triggers significant Pt dissolution. Therefore, designing Pt-based catalysts able to withstand such conditions is of critical importance. We report here on a strategy to suppress Pt dissolution by using an organic matrix tris(aza)pentacene (TAP) as an alternative support material for Pt. The major benefit of TAP is its potential-dependent conductivity in aqueous media, which was directly evidenced by electrochemical impedance spectroscopy. At potentials below ∼0.45 V$_{RHE}$, TAP is protonated and its conductivity is improved, which enables supported Pt to run hydrogen reactions. At potentials corresponding to Pt oxidation/reduction (>∼0.45 V$_{RHE}$), TAP is deprotonated and its conductivity is restricted. Tunable conductivity of TAP enhanced the durability of the Pt/TAP with respect to Pt/C when these two materials were subjected to the same degradation protocol (0.1 M HClO$_4$ electrolyte, 3000 voltammetric scans, 1 V/s, 0.05−1.4 V$_{RHE}$). The exceptional stability of Pt/TAP composite on a nanoscale level was confirmed by identical location TEM imaging before and after the used degradation protocol. Suppression of transient Pt dissolution from Pt/TAP with respect to the Pt/C benchmark was directly measured in a setup consisting of an electrochemical flow cell connected to inductively coupled plasma-mass spectrometry. degradation platinum electrodes catalysts dissolution elektrokemija elektrokataliza gorivne celice ogljik Pt reakcije true false true Angleški jezik Slovenski jezik Članek v reviji 2022-09-16 13:39:28 2022-09-16 13:39:28 2022-09-24 04:12:16 0000-00-00 00:00:00 2022 0 0 Str. 3540-3548 iss. 4 Vol. 7 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.5/.6 2470-1343 10.1021/acsomega.1c06028 95435011 acsomega.1c06028_Suppressing_Platinum_Electrocatalyst_Degradation_via_High-surface-area_Organic_Matrix_Support.pdf acsomega.1c06028_Suppressing_Platinum_Electrocatalyst_Degradation_via_High-surface-area_Organic_Matrix_Support.pdf 1 EBC24DF97D73F3DD405F02C30664589B e69a7168d435ff6852435bc6d3a7e505910dfa8777ea89f7dfe10d036991f90b 6fd9e02f-3b27-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=162058 https://pubs.acs.org/doi/10.1021/acsomega.1c06028 0 274e3b12-35b4-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=161422 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0