Seminar

Atomically Engineered Materials for Solar-driven Water Splitting

조회수 : 305 등록일 : 2014.12.17 09:28

일시 : 2014.12.19 13:30
소속 : East China University of Science and Technology
발표자 : Prof. Huagui Yang
장소 : R404
The growing energy crisis and environmental issues are driving the development of clean and
sustainable energy sources. In particular, solar energy as one of the best sources of renewable energy has attracted significant attention as a promising way to solve these problems. Herein, we studied various atomically engineered catalytic materials to enhance the solar-driven water splitting. First of all, using polymer ligands to control the size and valence state of platinum monoxide clusters, we found that Pt in a higher oxidation has remarkable hydrogen oxidation reaction suppression ability, while its H2 evolution capacity is still comparable to that of the benchmark of conventional Pt cocatalyst.[1]photocatalyst on atomic level by a collaborative analysis from both experimental and theoretical work; metallic Pt0
by contrast, oxidized species Ptδ+we designed and synthesized a surface H-bonding network decorated g-C3N4 photocatalystwith high efficiency of visible-light-driven H2 production. According to NMR and theoretical modeling, the H-bonding bridge can effectively shorten the distance between water molecules and g-C3N4, provide multiple channels for the transition between protons and the excited electrons on g-C3N4, stabilize the anionic intermediate and transition states, and restrain charge  recombination.[3] exhibits a high solar-driven hydrogen evolution performance compared with Pt nanoparticles  or clusters. The configurations of the isolated Pt atoms and their catalytic hydrogen evolution  activity were calculated by large-scale periodic DFT analysis.[4] photoreactivity of hydrogen generation can be correlated with the cluster size of the oxidized  platinum cocatalyst as function, and the maximum turnover frequency is found on the smallest - sized cocatalyst.[5] These results would open a door for rethinking of the detailed principles of photocatalysis, and may also stimulate novel ideas for the design and optimization of heterogeneous photocatalysts.Moreover, we explored the active sites of Pt/TiO2 nanoparticles have little contribution to the activity of solar water splitting and truly take the role of the catalytic active sites.[2] In addition, Furthermore, we anchored isolated Pt atoms on TiO2 and this photocatalyst Additionally, we found that the
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