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

Yanyan Zhao, Ke R. Yang, Zechao Wang, Xingxu Yan, Sufeng Cao, Yifan Ye, Qi Dong, Xizi Zhang, James E. Thorne, Lei Jin, Kelly L. Materna, Antonios Trimpalis, Hongye Bai, Sirine C. Fakra, Xiaoyan Zhong, Peng Wang, Xiaoqing Pan, Jinghua Guo, Maria Flytzani-Stephanopoulos, Gary W. BrudvigVictor S. Batista, Dunwei Wang

Research output: Contribution to journalArticle

60 Citations (Scopus)

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

Original languageEnglish
Pages (from-to)2902-2907
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume115
Issue number12
DOIs
Publication statusPublished - Mar 20 2018

Keywords

  • Catalyst
  • STEM
  • Solar energy
  • Spectroscopy
  • Water splitting

ASJC Scopus subject areas

  • General

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    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., ... Wang, D. (2018). Stable iridium dinuclear heterogeneous catalysts supported on metal-oxide substrate for solar water oxidation. Proceedings of the National Academy of Sciences of the United States of America, 115(12), 2902-2907. https://doi.org/10.1073/pnas.1722137115