Ir-Sn-Sb-O Electrocatalyst for Oxygen Evolution Reaction: Physicochemical Characterization and Performance in Water Electrolysis Single Cell with Solid Polymer Electrolyte

Autor:	Virginia H. Collins-Martínez, Nicté J. Pérez-Viramontes, José R. Flores-Hernández, Ismailia L. Escalante-Garcia, M. Galván-Valencia, S.M. Durón-Torres
Rok vydání:	2020
Předmět:	Materials science Electrolysis of water Scanning electron microscope OER electrocatalyst Oxygen evolution solid polymer electrolyte water electrolyser 02 engineering and technology lcsh:Chemical technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Tin oxide 01 natural sciences Catalysis 0104 chemical sciences lcsh:Chemistry lcsh:QD1-999 Chemical engineering Mixed oxide lcsh:TP1-1185 Physical and Theoretical Chemistry Temperature-programmed reduction 0210 nano-technology Ir-Sn-Sb-O Hydrogen production
Zdroj:	Catalysts Volume 10 Issue 5 Catalysts, Vol 10, Iss 524, p 524 (2020)
ISSN:	2073-4344
DOI:	10.3390/catal10050524
Popis:	Mixed oxide Ir-Sn-Sb-O electrocatalyst was synthesized using thermal decomposition from chloride precursors in ethanol. Our previous results showed that Ir-Sn-Sb-O possesses electrocatalytic activity for an oxygen evolution reaction (OER) in acidic media. In the present work, the physicochemical characterization and performance of Ir-Sn-Sb-O in an electrolysis cell are reported. IrO2 supported on antimony doped tin oxide (ATO) was also considered in this study as a reference catalyst. Scanning electron microscopy (SEM) images indicated that Ir-Sn-Sb-O has a mixed morphology with nanometric size. Energy dispersive X-ray spectroscopy (EDS) showed a heterogeneous atomic distribution. Transmission electron microscopy (TEM) analysis resulted in particle sizes of IrO2 and ATO between 3 to > 10 nm, while the Ir-Sn-Sb-O catalyst presented non-uniform particle sizes from 3 to 50 nm. X-ray diffraction (XRD) measurements indicated that synthesized mixed oxide consists of IrO2, IrOx, doped SnO2 phases and metallic Ir. The Ir-Sn-Sb-O mixed composition was corroborated by temperature programmed reduction (TPR) measurements. The performance of Ir-Sn-Sb-O in a single cell electrolyser showed better results for hydrogen production than IrO2/ATO using a mechanical mixture. Ir-Sn-Sb-O demonstrated an onset potential for water electrolysis close to 1.45 V on Ir-Sn-Sb-O and a current density near to 260 mA mg&minus 1 at 1.8 V. The results suggest that the mixed oxide Ir-Sn-Sb-O has favorable properties for further applications in water electrolysers.
Databáze:	OpenAIRE
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