Phase‐Contact Engineering in Mono‐ and Bimetallic Cu‐Ni Co‐catalysts for Hydrogen Photocatalytic Materials

• Published in: Angewandte Chemie International Edition Vol. 57; no. 5; pp. 1199 - 1203
• Main Authors: Muñoz‐Batista, Mario J., Motta Meira, Debora, Colón, Gerardo, Kubacka, Anna, Fernández‐García, Marcos
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 26.01.2018
• Edition: International ed. in English
• Subjects: Absorption spectroscopy; Bimetals; bio-alcohol reforming; Catalysis; Catalysts; Computer applications; Computer simulation; Copper; Experimental methods; Hydrogen production; light–matter interactions; Nickel; Noble metals; operando X-ray absorption; Oxidation; Photocatalysis; Spectroscopy; Titanium dioxide; Valence; X-ray absorption spectroscopy; operando X-ray absorption; photocatalysis; bio-alcohol reforming; hydrogen production; light-matter interactions
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201709552

Understanding how a photocatalyst modulates its oxidation state, size, and structure during a photocatalytic reaction under operando conditions is strongly limited by the mismatch between (catalyst) volume sampled by light and, to date, the physicochemical techniques and probes employed to study them. A synchrotron micro‐beam X‐ray absorption spectroscopy study together with the computational simulation and analysis (at the X‐ray cell) of the light‐matter interaction occurring in powdered TiO2‐based monometallic Cu, Ni and bimetallic CuNi catalysts for hydrogen production from renewables was carried out. The combined information unveils an unexpected key catalytic role involving the phase contact between the reduced and oxidized non‐noble metal phases in all catalysts and, additionally, reveals the source of the synergistic Cu‐Ni interaction in the bimetallic material. The experimental method is applicable to operando studies of a wide variety of photocatalytic materials. A synchrotron micro‐beam X‐ray absorption spectroscopy study together with the computational simulation and analysis (at the X‐ray cell) was carried out for the light–matter interaction occurring in powdered TiO2‐based monometallic Cu, Ni, and bimetallic CuNi catalysts for photocatalytic hydrogen production from renewables.