Details

Autor(en) / Beteiligte

• Hang Li, Yu
• Xing, Jun
• Jia Chen, Zong
• Li, Zhen
• Tian, Feng
• Rong Zheng, Li
• Feng Wang, Hai
• Hu, P.
• Jun Zhao, Hui
• Gui Yang, Hua

Titel

Unidirectional suppression of hydrogen oxidation on oxidized platinum clusters

Ist Teil von

• Nature communications, 2013-09, Vol.4 (1), p.2500-2500, Article 2500

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Solar-driven water splitting to produce hydrogen may be an ideal solution for global energy and environment issues. Among the various photocatalytic systems, platinum has been widely used to co-catalyse the reduction of protons in water for hydrogen evolution. However, the undesirable hydrogen oxidation reaction can also be readily catalysed by metallic platinum, which limits the solar energy conversion efficiency in artificial photosynthesis. Here we report that the unidirectional suppression of hydrogen oxidation in photocatalytic water splitting can be fulfilled by controlling the valence state of platinum; this platinum-based cocatalyst in a higher oxidation state can act as an efficient hydrogen evolution site while suppressing the undesirable hydrogen back-oxidation. The findings in this work may pave the way for developing other high-efficientcy platinum-based catalysts for photocatalysis, photoelectrochemistry, fuel cells and water–gas shift reactions. Platinum is a widely studied catalyst for the reduction of protons to hydrogen in water splitting, but it also catalyses the competing hydrogen oxidation back-reaction, thus limiting efficiency. Here, the authors show that the back-reaction can be limited by tuning the platinum oxidation state.