氧化锌前驱体对(Ga_(1-x)Zn_x)(N_(1-x)O_x)固溶体分解纯水产氢活性的影响

EFFECTS OF ZnO PRECURSOR ON PHOTOCATALYTIC ACTIVITY FOR PURE WATER SPLITTING OVER (Ga_(1-x)Zn_x) (N_(1-x)O_x)SOLID SOLUTIONS

利用不同ZnO前驱物,采用高温氮化Ga_2O_3和ZnO方法,制备了一系列(Ga_(1-x)Zn_x)(N_(1-x)O_x)固溶体催化剂。研究结果显示,不同ZnO前驱物对(Ga_(1-x)Zn_x)(N_(1-x)O-x)固溶体催化剂的产氢活性有较大影响。用自制的ZnO作为前驱物时,合成的固溶体光催化剂具有较高活性,约为用商品ZnO作前驱物时的4倍。通过商品ZnO和自制ZnO及GaN的XRD表征可以看出,自制ZnO的XRD衍射峰位置更接近于GaN的衍射峰位置。因此自制的ZnO更容易与GaN形成固溶体,从而有助于提高(Ga_(1-x)Zn_x)(N_(1-x)O_x)催化剂的光催化能力。另外,不同温度煅烧的ZnO前驱物对(Ga_(1-x)Zn_x)(N_(1-x)O_x)催化剂的产氢性能有较大影响,其中用823K煅烧过的ZnO合成的固溶体光催化剂有较高的光催化活性。

A series of solid solutions of （Ga 1_xZnx ） （N1 _xOx ）by nitriding a mixture of Ga/O3 and ZnO was prepared under a flow of NH3 at 1123K for 15 hours. The results shown that the zinc sources can influence photocatalyric ability significantly. The photocatalytic ability of （Ga 1_xZnx ） （N1 _xOx ） made of home-made ZnO is 4 times as （Ga 1_xZnx ） （N1 _xOx ） made of commercial ZnO. It can be seen from the XRD patterns that the diffraction peaks of home-made ZnO are closer to the diffraction peaks of GaN than commercial ZnO. So we can include that it is easier for home-made ZnO to form （Ga 1_xZnx ） （N1 _xOx ） with GaN. Besides, nitriding a mixture of ZnO calcined at different temperatures and Ga203 can also influence the photocatalytic ability of （Ga 1_xZnx ） （N1 _xOx ） The solid solution made of Ga203 and ZnO calcined at 823K achieve the highest photocatalytic efficiency.