I am bit confused about your word "dope." Did you mean to incorporate or anchor CoSe on MXene? Since dope usually refers to introduce foreign elements as impurities into host structures.
If you mean anchor or incorporate, my answer to your question is yes. There are numerous reported examples, such as the following one:
https://www.mdpi.com/2079-4991/10/9/1666
Heterostructure Composites of CoS Nanoparticles Decorated on Ti3C2Tx Nanosheets and Their Enhanced Electromagnetic Wave Absorption Performance
I'm sorry for the confusion that i've created. It was like you said, I meant about incorporating the CoSe particles in MXenes. Tianyu Liu sir the paper that you have recommended contains CoS and not CoSe, can we incorporate CoSe into MXenes?
My hump tells me that CoS and CoSe are quite similar, and it is likely that you can incorporate CoSe into MXenes. The previous method can serve as a reference for your method development.