Details

Autor(en) / Beteiligte

• Song, Kai
• Yue, Mufei
• Gao, Wenliang
• Cong, Rihong
• Yang, Tao

Titel

Intrinsic photocatalytic water reduction over PbGaBO sub(4) comprising edge-sharing GaO sub(6) chains

Ist Teil von

• Journal of alloys and compounds, 2016-11, Vol.684, p.346-351

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Metal borates are well-known optical materials while their semiconducting behavior, i.e. photocatalytic property, was less studied. Inspired by the recent publications on gallium borates with good photocatalytic performances, we investigated photocatalytic water reduction activity of another gallium borate, PbGaBO sub(4), comprising edge-sharing GaO sub(6)-chains. Both conventional and solution assisted solid state reaction methods were employed for the preparation. Phase purity and the crystallinity of both samples were identified by powder X-ray diffraction and scanning electron microscopy. The UV-Vis reflectance spectra suggested the wide bandgap characteristic (4.10 eV) and theoretical calculations pointed out that the 6s and 5p orbitals of Pb super(2+) contribute to both the bottom of CB and the top of VB. However the ionic bonding of Pbsingle bond O in PbGaBO sub(4) led to a slight hydrolysis during the photocatalysis process, which can be suppressed by loading cocatalysts of Pt and RuO sub(x). In addition, such a surficial modification significantly improved the photocatalytic water reduction ability, with an optimal H sub(2) evolution rate of 41.9(9) mu mol/h/g under UV-light irradiation.