Hi. I suggest this article that I hope can help you .

Article: Nanomaterials 2020, 10, 351; doi:10.3390/nano10020351

thank you Aref Wazwaz . but still, I am not getting it.

Hi, I think you can take a look at the XRD of similar published articles, this can give an idea about the position of the peaks you can get at least for carbon nanofibers, then you can interpret the differences as you have a doped material.

I suggest to take a look at those articles:

Article Characterization of carbon nanofiber composites synthesized ...

Article Development of carbon nanofibers from aligned electrospun po...

Article X-Ray Diffraction Analysis of Kraft Lignins and Lignin-Deriv...

Hi Surbhi Anand,

The XRD peak at 2-Theta=~25 degree is the characteristic peak (002) of hexagonal graphite. You can refer to the attached article for this.

You have not mentioned about the dopant species. The XRD peak at 2-Theta=~10 degree appearing maybe due to the doping you've done during synthesis. For these, I agree with @Morad Zouheir.

Hope it helps!

Thanks,

Samit

Wang, Suqing, Lu Xia, Le Yu, Lei Zhang, Haihui Wang, and Xiong Wen Lou. "Free‐standing nitrogen‐doped carbon nanofiber films: integrated electrodes for sodium‐ion batteries with ultralong cycle life and superior rate capability." Advanced Energy Materials 6, no. 7 (2016): 1502217.

I think you can make use from the following links

Article Facile synthesis of Fe/CeO 2 -doped CNFs and Their Capacitan...

Article High Pressure Study Of Nitrogen Doped Carbon Nanotubes Using...

and this attachment

I think the following research article could help you:

http://www.scut.hhwang.ycym.com/Uploads/201703/58ca3a9489bda.pdf