Suppressing platinum electrocatalyst degradation via a high-surface-area organic matrix support

Smiljanić, Milutin (avtor), Bele, Marjan (avtor), Moriau, Leonard (avtor), Vélez Santa, John Fredy (avtor), Menart, Svit (avtor), Šala, Martin (avtor), Hrnjić, Armin (avtor), Jovanovič, Primož (avtor), Ruiz-Zepeda, Francisco (avtor), Gaberšček, Miran (avtor), Hodnik, Nejc (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: degradation, platinum, electrodes, catalysts, dissolution
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: Str. 3540-3548
• Številčenje: Vol. 7, iss. 4
• PID: 20.500.12556/RUL-140636
• UDK: 544.5/.6
• ISSN pri članku: 2470-1343
• DOI: 10.1021/acsomega.1c06028
• COBISS.SI-ID: 95435011
• Datum objave v RUL: 16.09.2022

Gradivo je del revije

• Naslov: ACS omega
• Skrajšan naslov: ACS omega
• Založnik: American Chemical Society
• ISSN: 2470-1343
• COBISS.SI-ID: 525873945

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: elektrokemija, elektrokataliza, gorivne celice, ogljik, Pt, reakcije