Stable iridium dinuclear heterogeneous catalysts supported on metal-oxide substrate for solar water oxidation.

Author(s) Zhao, Y.; Yang, K.R.; Wang, Z.; Yan, X.; Cao, S.; Ye, Y.; Dong, Q.; Zhang, X.; Thorne, J.E.; Jin, L.; Materna, K.L.; Trimpalis, A.; Bai, H.; Fakra, S.C.; Zhong, X.; Wang, P.; Pan, X.; Guo, J.; Flytzani-Stephanopoulos, M.; Brudvig, G.W.; Batista, V.S.; Wang, D.
Journal Proc Natl Acad Sci U S A
Date Published 2018 Mar 05

Atomically dispersed catalysts refer to substrate-supported heterogeneous catalysts featuring one or a few active metal atoms that are separated from one another. They represent an important class of materials ranging from single-atom catalysts (SACs) and nanoparticles (NPs). While SACs and NPs have been extensively reported, catalysts featuring a few atoms with well-defined structures are poorly studied. The difficulty in synthesizing such structures has been a critical challenge. Here we report a facile photochemical method that produces catalytic centers consisting of two Ir metal cations, bridged by O and stably bound to a support. Direct evidence unambiguously supporting the dinuclear nature of the catalysts anchored on α-FeOis obtained by aberration-corrected scanning transmission electron microscopy (AC-STEM). Experimental and computational results further reveal that the threefold hollow binding sites on the OH-terminated surface of α-FeOanchor the catalysts to provide outstanding stability against detachment or aggregation. The resulting catalysts exhibit high activities toward HO photooxidation.

DOI 10.1073/pnas.1722137115
ISSN 1091-6490
Citation Proc Natl Acad Sci USA. 2018.

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