Photoelectrochemical Water Splitting on a Delafossite CuGaO2 Semiconductor Electrode

Bulletin of the Korean chemical society

Yeong Il Kim¹  Yong Tae Yoon¹  Myeongsoon Lee¹  Don Kim¹ 

关键词: CuGaO2;    Delafossite;    Photocathode;    p-Type semiconductor;    Water splitting;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

A pellet of polycrystalline CuGaO2 with a delafossite structure was prepared from Ga2O3 and CuO by hightemperature solid-state synthesis. The CuGaO2 pellet was a p-type semiconductor for which the electrical conductivity, carrier density, carrier mobility and Seebeck coefficient were 5.34 × 10−2 Ω−1cm−1, 3.5 × 1020 cm−3, 9.5 × 10−4 cm2V−1s−1 at room temperature, and +360 μV/K, respectively. It also exhibited two optical transitions at about 2.7 and 3.6 eV. The photoelectrochemical properties of the CuGaO2 pellet electrode were investigated in aqueous electrolyte solutions. The flat-band potential of this electrode, determined using a Mott- Schottky plot, was +0.18 V vs SCE at pH 4.8 and followed the Nernst equation with respect to pH. Under UV light illumination, a cathodic photocurrent developed, and molecular hydrogen simultaneously evolved on the surface of the electrode due to the direct reduction of water without deposition of any metal catalyst.

【 授权许可】

Unknown