Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 143, Issue 13, Pages 5201-5211Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c01525
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Funding
- Australian Research Council [FL170100154, DP160104866, DP190103472]
- Zhejiang Provincial Natural Science Foundation of China [LR18B030003]
- National Natural Science Foundation of China [51701181, 21771161]
- Thousand Talents Program for Distinguished Young Scholars
- Chinese CSC Scholarship Program
- Australian Government
- University of Adelaide
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This study proposes a method to integrate noble metal atoms into the lattice of transition metal oxides to create a new type of hybrid structure, showing that iridium single atoms can be effectively accommodated into cobalt spinel oxide. The resultant catalyst exhibits significantly higher electrocatalytic activity under acidic conditions, with improved corrosion resistance and oxidative potentials. This work eliminates the close-packing limitation of noble metals and offers promising opportunities for creating analogues with desired topologies for various catalytic applications.
Noble metals manifest themselves with unique electronic structures and irreplaceable activity toward a wide range of catalytic applications but are unfortunately restricted by limited choice of geometric structures spanning single atoms, clusters, nanoparticles, and bulk crystals. Herein, we propose how to overcome this limitation by integrating noble metal atoms into the lattice of transition metal oxides to create a new type of hybrid structure. This study shows that iridium single atoms can be accommodated into the cationic sites of cobalt spinel oxide with short-range order and an identical spatial correlation as the host lattice. The resultant Ir0.06Co2.94O4 catalyst exhibits much higher electrocatalytic activity than the parent oxide by 2 orders of magnitude toward the challenging oxygen evolution reaction under acidic conditions. Because of the strong interaction between iridium and cobalt oxide support, the Ir0.06Co2.94O4 catalyst shows significantly improved corrosion resistance under acidic conditions and oxidative potentials. This work eliminates the close-packing limitation of noble metals and offers promising opportunity to create analogues with desired topologies for various catalytic applications.
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