成果報告書詳細
管理番号20160000000364
タイトル*平成27年度中間年報 固体高分子形燃料電池利用高度化技術開発事業 普及拡大化基盤技術開発 カソード高機能化に資する相界面設計
公開日2016/7/7
報告書年度2015 - 2015
委託先名国立大学法人九州大学 国立大学法人信州大学 国立大学法人京都大学
プロジェクト番号P15001
部署名新エネルギー部
和文要約
英文要約Polymer electrolyte fuel cells (PEFCs) are promising alternative power sources. In the present study, we aim to develop two types of highly active and durable Pt cathode catalysts with new phase boundaries. One is silica-coated Pt catalysts supported on metal oxides and another is Pt nanosheets. The silica-coated Pt catalysts supported on metal oxides is expected to show excellent durability because the silica which wraps around Pt metal particles prevents increase of Pt particle size. Metal oxide supports show high tolerance to oxidative corrosion. Additionally, the porous hydrophobic silica layers should promote the diffusion of oxygen and water in the silica layers. Pt nanosheets are anticipated to show higher durability under cathodic conditions compared with Pt nanoparticles, because the number of coordinatively unsaturated Pt atoms in Pt nanosheets is smaller. The project consists of six themes as given below:
Development of silica layers for highly active and durable silica-coated Pt catalysts
The hydrophobic silica layers with large pores promote the diffusion of oxygen and water molecules, which results in the high activity of the silica-coated Pt catalysts.
Improvement of durability of cathode catalysts using metal oxides as supports
To obtain high surface area Magnーli phase (TinO2n-1) with electrical conductivity, TiO2 nanosheets (TiO2ns) were coated on SiO2 particles and reduced under H2 gas atmosphere at high temperature. Additionally, highly dispersed Pt particles were deposited on TiO2 particles.
Structure design of catalyst layer with novel catalysts and novel support and evaluation of high-output density MEA
In order to design for optimal catalyst layer by simulation, the oxygen transport resistance of SiO2 layer was estimated by experimental data. Oxygen diffusion resistance of ionomer and SiO2 layer was almost equal to each other. SiO2 layer had proton conductivity on the same level with ionomer.
Establishment of synthetic method of Pt and core-shell M@Pt nanosheet catalyst using nanosheet templating and elucidation of ORR activity on their nanosheet catalysts
Carbon supported Ru@Pt core-shell nanosheet catalyst was synthesized using ruthenium nanosheet/C as a template. The carbon supported Ru@Pt core-shell nanosheet had 4 times higher ORR activity compared with commercial Pt/C catalysts.
Development of highly active and durable core-shell M@Pt nanosheets using graphene templates
Small particles of Pt(II) could be densely deposited on the GO by the photoirradiation of Pt(II) acetylacetonate in ethanol. The calcination of Pt(II) particles supported on the GO in air resulted in the formation of free-standing Pt nanosheets with 5 nm thickness.
Development of low polarization catalyst layer using nanosheets from the view point of mass transport
MEA was prepared using Ru nanosheet (Ru ns) catalyst provided by Sugimoto Lab. and Pt/GO prepared by Takenaka Lab. as cathode catalysts and the effect of I/C was investigated.
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