A novel K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure has been synthesized via a facile one-pot hydrother-mal route with no aid of additives.The as-prepared samples were characterized by powder X-ray diffrac...A novel K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure has been synthesized via a facile one-pot hydrother-mal route with no aid of additives.The as-prepared samples were characterized by powder X-ray diffraction,ultra-violet-visible spectroscopy and field emission scanning electron microscopy.The photocatalytic H_(2)evolution was performed in an aqueous methanol solution under UV light irradiation.The as-prepared K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure showed higher H_(2)production activity than that of perovskite KNbO_(3)and commercial Nb2O5 powders in the absence of cocatalysts,due mainly to its unique crystal and energy band structures.The rate of H_(2)evolution can be significantly enhanced by loading of Pt nanoparticles.The highest H_(2)evolution rate of 121μmol/h was reached when 0.7 wt%Pt nanoparticles were used,which was about 20 times higher than that of pristine K_(2)Nb_(2)O_(6).展开更多
基金Financial support from the Ministry of Science and Technology of China(Nos.2014CB239402 and 2013CB834505)the National Natural Science Founda-tion of China(Nos.51322213,21301183,20901081,51172245,and 91127005)+2 种基金Knowledge Innovation Pro-ject of the Chinese Academy of Sciences(KGCX2-EW-311-3)the Beijing Natural Science Foundation(Nos.2112042 and 2122054)the 100 Talents Program of the Chinese Academy of Sciences,and Scientific Research Foundation for Returned Scholars of Ministry of Educa-tion of China is gratefully acknowledged.
文摘A novel K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure has been synthesized via a facile one-pot hydrother-mal route with no aid of additives.The as-prepared samples were characterized by powder X-ray diffraction,ultra-violet-visible spectroscopy and field emission scanning electron microscopy.The photocatalytic H_(2)evolution was performed in an aqueous methanol solution under UV light irradiation.The as-prepared K_(2)Nb_(2)O_(6)photocatalyst with pyrochlore structure showed higher H_(2)production activity than that of perovskite KNbO_(3)and commercial Nb2O5 powders in the absence of cocatalysts,due mainly to its unique crystal and energy band structures.The rate of H_(2)evolution can be significantly enhanced by loading of Pt nanoparticles.The highest H_(2)evolution rate of 121μmol/h was reached when 0.7 wt%Pt nanoparticles were used,which was about 20 times higher than that of pristine K_(2)Nb_(2)O_(6).
