p-n Junction silicon electrode coated with noble metal for efficient solar photoelectrolysis of hydrogen iodide.

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概要

• 論文の詳細を見る

• The photooxidation of iodide ions on n-type silicon electrodes highly doped with boron from the surface in hydrogen iodide or hydrogen iodide/iodine solutions was investigated. Two doping methods were employed: thermal diffusion and ion implantation. The electrode was remarkably stabilized by coating with a 2 to 3 nm-thick platinum layer, followed by heat-treatment at about 400 °C for <I>ca.</I> 10 min. The photocurrent was stable for more than 500 h at a density of the order of 10 mA cm<SUP>−2</SUP>. The boron-doped and Pt-coated n-Si electrode also generated a photovoltage much higher than that for a Pt-coated n-Si electrode, showing an advantage of forming the p-n junction. Photoelectrochemical cells made of a boron-doped-Pt-coated n-Si electrode, a platinized Pt counter electrode, and a commercial cation exchange membrane were found to photoelectrolyze hydrogen iodide without externally applied voltage into hydrogen and iodine with a solar-to-chemical energy conversion efficiency (φ<SUB>chem</SUB><SUP>s</SUP>) under simulated AM 1 solar radiation of 8.2%, probably the highest of the φ<SUB>chem</SUB><SUP>s</SUP> values observed for the cells working without external voltage.

• 公益社団法人 日本化学会の論文

著者

• Nakato Yoshihiro

  Laboratory For Chemical Conversion Of Solar Energy And Department Of Chemistry Faculty Of Engineerin

• TSUBOMURA Hiroshi

  Laboratory for Chemical Conversion of Solar Energy and Department of Chemistry, Faculty of Engineeri

• Yoshimura Motomu

  Laboratory for Chemical Conversion of Solar Energy, Department of Chemistry, Faculty of Engineering Science, Osaka University

• Murahashi Toshiaki

  Laboratory for Chemical Conversion of Solar Energy, Department of Chemistry, Faculty of Engineering Science, Osaka University

• Hiramoto Masahiro

  Laboratory for Chemical Conversion of Solar Energy, Department of Chemistry, Faculty of Engineering Science, Osaka University

• Tsumura Akira

  Laboratory for Chemical Conversion of Solar Energy, Department of Chemistry, Faculty of Engineering Science, Osaka University

• Tsubomura Hiroshi

  Laboratory for Chemical Conversion of Solar Energy, Department of Chemistry, Faculty of Engineering Science, Osaka University

• Nakato Yoshihiro

  Laboratory for Chemical Conversion of Solar Energy, Department of Chemistry, Faculty of Engineering Science, Osaka University

関連論文

• The Effect of Interposing Thin Oxide Layers on the Photovoltaic Properties of a-Si:H Solar Cells. : I. Between a-Si:H and Transparent Conductive Oxide Layers : Condensed Matter
• A New Approach to an Efficient and Low-Cost Solid Solar Cell by Employing a Semiconductor Coated with Ultrafine Metal Islands
• p-n Junction silicon electrode coated with noble metal for efficient solar photoelectrolysis of hydrogen iodide.
• Stabilization of platinum-loaded CdS photocatalyst by addition of EDTA.
• Photocatalytic hydrogen evolution from aqueous solutions of sodium sulfite using platinum-loaded CdS1-xSex mixed cystal powder.

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