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


ABSTRACT: 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 ?-Fe2O3 is 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 ?-Fe2O3 anchor the catalysts to provide outstanding stability against detachment or aggregation. The resulting catalysts exhibit high activities toward H2O photooxidation.

SUBMITTER: Zhao Y 

PROVIDER: S-EPMC5866603 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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

Zhao Yanyan Y   Yang Ke R KR   Wang Zechao Z   Yan Xingxu X   Cao Sufeng S   Ye Yifan Y   Dong Qi Q   Zhang Xizi X   Thorne James E JE   Jin Lei L   Materna Kelly L KL   Trimpalis Antonios A   Bai Hongye H   Fakra Sirine C SC   Zhong Xiaoyan X   Wang Peng P   Pan Xiaoqing X   Guo Jinghua J   Flytzani-Stephanopoulos Maria M   Brudvig Gary W GW   Batista Victor S VS   Wang Dunwei D  

Proceedings of the National Academy of Sciences of the United States of America 20180305 12


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 repor  ...[more]

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