* Corresponding authors

^a Department of Chemistry “G. Ciamician”, University of Bologna, Via Selmi 2, 40126 Bologna, Italy
E-mail: paola.ceroni@unibo.it

^b Department of Chemistry, University of Milan, INSTM Research Unit, via C. Golgi 19, 20133 Milano, Italy

^c Dipartimento di Scienze Chimiche e Farmaceutiche, INSTM UdR Ferrara, Via Fossato di Mortara 17, 44121 – Ferrara, Italy

^d Department of Chemical Engineering, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, TX, USA
E-mail: korgel@che.utexas.edu

^e INSTM UdR Bologna, Via Selmi 2, 40126 Bologna, Italy
E-mail: giacomo.bergamini@unibo.it

^f Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM), Italy