What is the best co-catalyst (metal) with TiO2 to tune its band gap to absosrb maximum visible radiation from sunlight for envi. photocatalysis?
Dear Ankush Sharma, most researches are using dopping instead of co-catalyst to reduce the large band gap of TiO2 for better photo activation. Please have a look at the following documents. My Regards
DOI: 10.5772/intechopen.79374
https://doi.org/10.3390/catal10060679
https://aip.scitation.org/doi/10.1063/1.4812702
https://iopscience.iop.org/article/10.1088/1361-6463/ac21fc
Nitrogen is the best dopant according to Asahi's article published in Science (2000)
Hi Ankush Sharma
You can use Ag, AgI, and Ag3PO4 and so on. Also for more information refer to the below-mentioned papers.
doi.org/10.1016/j.mssp.2019.104689
doi.org/10.1016/j.ceramint.2019.11.058
doi.org/10.1016/j.jcis.2020.10.140
doi.org/10.1016/j.mssp.2021.106142
Best wishes
Dear Ankush Sharma, it is better to go for doping than using co-catalyst to reduce its band gap.
You can also use photosensitive and/or conjugative materials like dyes, polymers, rGO, etc to enhance the TiO2 visible light activity.
Remember that in addition to band gap, particle size and surface area of the semiconductor and experimental conditions like solution pH, catalyst loading, reaction time, etc will also have a significant role in photocatalytic activity.
I don.t think co-catalyst can change the band-gap.Loading co-catalyst can only shift the light absorption band edge of your material and this can be observed in your UV visible spectral. Most time a up shift to higher absorbance (a.u). This can probably be observed by loading co-catalyst or any surface impurity.Therefore, I suggest you use a good metal or non-metal dopant which can effectively shift the band-gap.
- Badges
- Science topic