Capabilities of a novel electrochemical cell for operando XAS and SAXS investigations for PEM fuel cells and water electrolysers

被引:2
作者
Bogar, Marco [1 ]
Yakovlev, Yurii [2 ]
Pollastri, Simone [3 ,4 ]
Biagi, Roberto [3 ,5 ,6 ]
Amenitsch, Heinz [7 ]
Taccani, Rodolfo [1 ]
Matolinova, Iva [2 ]
机构
[1] Univ Trieste, Dept Engn & Architecture, Via Alfonso Valerio 6-1, I-34127 Trieste, Italy
[2] Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, 5Holesovickach 2, Prague 8, Czech Republic
[3] Univ Modena & Reggio Emilia, Dept Phys Comp Sci & Math, I-41125 Modena, Italy
[4] ELETTRA Sincrotrone Trieste SCpA, SS 14-Km 163,5, I-34149 Trieste, Italy
[5] CNR, Ist Nanosci NANO S3, Via G Campi 213-A, I-41125 Modena, Italy
[6] Univ Modena & Reggio Emilia, Ctr H2 MORE, I-41125 Modena, Italy
[7] Graz Univ Technol, Inst Inorgan Chem, Stremayrgasse 9, A-8010 Graz, Austria
关键词
Operando; XAS; SAXS; PEMFC; PEMWE; X-RAY-SCATTERING; SMALL-ANGLE SCATTERING; CATALYST DEGRADATION; SURFACE STRESS; VOIGT; PERFORMANCE; COMPUTATION; KINETICS; NEUTRON; IRIDIUM;
D O I
10.1016/j.jpowsour.2024.235070
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Catalyst stability is a key issue in current electrochemical devices, such as fuel cells (FCs) and water electrolysers (WEs). While for FCs, the main degradation process limiting catalyst stability have been highlighted, a clear picture is still missing concerning WEs. In this framework, in operando analyses are essential to characterize catalyst degradation over time. As X-Rays constitute the perfect probe for studying catalytic materials, we here present a reversible electrochemical cell designed for operando X-Ray Absorption Spectroscopy and Small and Wide Angle X-Ray Scattering analyses, which was used: (i) to study Pt/C catalyst degradation coupling the evolution of specific electrochemically active surface area (ECSA) with catalyst morphology, supported by the analysis of Pt oxidation state. As a result, an increase of particle (and particle cluster) size is connected to the diminishing of ECSA and to the changes in the fraction of metallic-to-oxidised Pt, underlying that changes mainly develop in the first 2000 cycles of applied stress tests. Finally, (ii) we introduce some preliminary results underlying the change in Ir oxidation state for a standard Ir/IrOX catalyst material for WEs, showing as such a change is not sufficient to induce any remarkable morphological variations within 500 cycles of stress tests.
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页数:8
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