Co-CNNS/CdS/CoP复合催化剂的制备及光催化产氢性能研究

Preparation of Co-CNNS/CdS/CoP composite catalyst and photocatalytic performance for hydrogen production

基于热缩聚法和非贵金属掺杂,通过超声剥离得到g-C_(3)N_(4)纳米片(CNNS)为二维结构,在其表面包覆一维的CdS纳米线,最后负载非贵金属催化剂CoP,成功制备出Co-CNNS/CdS/CoP复合催化剂,用于高效产氢。首先,通过Co掺杂和超声剥离法合成g-C_(3)N_(4)纳米片(CNNS),增加了反应的活性位点。然后构建了CdS和CNNS的异质结,促使吸收边带红移,对光的吸收能力增强,且光生电子-空穴的复合机率减小,提升了光生载流子的分离效率。此外,CoP助催化剂的添加降低了反应的活化能,促进了整体催化产氢的效率。最终制备出了具有良好光催化产氢活性和稳定性的4-Co-CNNS/CdS/CoP复合光催化材料,其制氢性能为315.7μmol·h^(-1)·g^(-1),较纯CNNS提升了近提升了近2.3倍。

Based on thermo condensation and non-noble metal doping,g-C_(3)N_(4)nanosheets(CNNS)were obtained by ultrasonic stripping with two-dimensional structure,and the surface was coated with one-dimensional CdS nanowires.Finally,the CoP non-noble metal catalyst was loaded to successfully prepare Co-C_(3)N_(4)/CdS/CoP composite catalyst for efficient hydrogen production.The active sites of the reaction were increased by using CNNS nanosheets synthesized by Co doping and ultrasonic stripping.At the same time,CdS and CNNS heterojunctions are constructed to promote the red shift of absorption sideband and enhance the absorption capacity of light,and the recombination probability of photoelectron-hole is reduced,which improves the separation efficiency of photogenerated carriers.In addition,the addition of CoP cocatalyst reduces the activation energy of the reaction and promotes the efficiency of overall catalytic hydrogen production.The 4-Co-CNNS/CdS/CoP composite photocatalytic material with good photocatalytic activity and stability for hydrogen production was prepared,and the hydrogen production performance was 315.7μmol·h^(-1)·g^(-1),which was nearly 2.3 times higher than that of pure CNNS.