Xiong Jinhua, Jing Kaiqiang, Zou Junhua, Liang Shijing, Wu Ling
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, P. R. China.
Dalton Trans. 2017 Oct 17;46(40):13935-13942. doi: 10.1039/c7dt03027d.
A hybrid of CdS/HCaNbO ultrathin nanosheets was synthesized successfully through a multistep approach. The structures, constitutions, morphologies and specific surface areas of the obtained CdS/HCaNbO were characterized well by XRD, XPS, TEM/HRTEM and BET, respectively. The TEM and BET results demonstrated that the unique structural features of CdS/HCaNbO restrained the aggregation of CdS nanoparticles as well as the restacking of nanosheets effectively. HRTEM showed that CdS nanocrystals of about 25-30 nm were firmly anchored on HCaNbO nanosheets and a tough heterointerface between CdS and the nanosheets was formed. Efficient interfacial charge transfer from CdS to HCaNbO nanosheets was also confirmed by EPR and photocurrent responses. The photocatalytic activity tests (λ > 400 nm) showed that the optimal hydrogen evolution activity of CdS/HCaNbO was about 4 times that of the bare CdS, because of the efficient separation of photo-generated carriers.
通过多步方法成功合成了CdS/HCaNbO超薄纳米片的杂化物。分别利用XRD、XPS、TEM/HRTEM和BET对所得CdS/HCaNbO的结构、组成、形貌和比表面积进行了很好的表征。TEM和BET结果表明，CdS/HCaNbO独特的结构特征有效地抑制了CdS纳米颗粒的聚集以及纳米片的重新堆叠。HRTEM显示，约25 - 30 nm的CdS纳米晶体牢固地锚定在HCaNbO纳米片上，并且在CdS与纳米片之间形成了牢固的异质界面。EPR和光电流响应也证实了从CdS到HCaNbO纳米片的有效界面电荷转移。光催化活性测试（λ > 400 nm）表明，由于光生载流子的有效分离，CdS/HCaNbO的最佳析氢活性约为纯CdS的4倍。
