Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202202987
Keywords
hydrogen evolution reaction; photocatalytic water splitting; synergetic alloying; solid-solution nanoparticles; water reduction cocatalysts
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Funding
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)/Japan Society for the Promotion of Science (JSPS) KAKENHI [JP19H05634, JP20K21236]
- Kyushu University advanced characterization platform as a program of the Nanotechnology Platform [JPMXP09A21KU0380]
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In this study, PtRu solid-solution alloy nanoparticles were used as high-performance cocatalysts for the H2 evolution reaction by transferring knowledge from electrocatalysis to photocatalysis. The nanoparticles exhibited excellent electrocatalytic and photocatalytic activity, making them a promising candidate for efficient overall water splitting.
Herein, PtRu solid-solution alloy nanoparticles enable high-performance H-2 evolution reaction cocatalysts through the transfer of knowledge from electrocatalysis to photocatalysis. Ultrafine PtRu alloy nanoparticles (1.0 +/- 0.2 nm in diameter) are synthesized by using a chemical polyol method and used for electro/photo-catalyses. Integration of PtRu nanoparticles with carbon and Al-doped SrTiO3 powders via liquid-phase adsorption and successive two-step air and H-2 annealing ensures uniform deposition of PtRu alloy nanoparticles (<2 nm) with a solid-solution structure. The PtRu alloy nanoparticles exhibit higher electrocatalytic activity for the hydrogen evolution reaction than monometallic Pt counterparts. Modifying Al-doped SrTiO3 with PtRu alloy nanoparticles results in efficient photocatalytic overall water-splitting activity with an apparent quantum yield of 65% at 365 nm and a solar-to-hydrogen energy conversion efficiency of 0.45%, which are the highest values among SrTiO3-based photocatalytic water splitting systems with Rh-free cocatalysts. Transient diffuse reflectance spectroscopy reveals that the PtRu nanoparticles have a superior electron-capturing ability than the Pt counterparts, probably due to the decreased work function of Pt by alloying with Ru. This work establishes a framework to elucidate catalytic trends and provides rational design guidance toward the development of bimetallic solid-solution nanoparticles as cost-effective and highly active cocatalysts for overall water splitting.
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