3D Hierarchical Boron-Doped Diamond-Multilayered Graphene Nanowalls as an Efficient Supercapacitor Electrode

Debosmita Banerjee, Kamatchi Jothiramalingam Sankaran, Sujit Deshmukh, Mateusz Ficek, Gourav Bhattacharya, Jacek Ryl, Deodatta Maheshwar Phase, Mukul Gupta, Robert Bogdanowicz, I-Nan Lin, Aloke Kanjilal, Ken Haenen, Susanta Sinha Roy

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Abstract

Synthesis of stable hybrid carbon nanostructure for high-performance supercapacitor electrode with long life-cycle for electronic and energy storage devices is a real challenge. Here, we present a one-step synthesis method to produce conductive boron-doped hybrid carbon nanowalls (HCNWs), where sp 2-bonded graphene has been integrated with and over a three-dimensional curved wall-like network of sp 3-bonded diamond. The spectroscopic studies such as X-ray absorption, Raman, and X-ray photoelectrons clearly reveal the coexistence of diamond and graphene in these nanowalls, while the detailed transmission electron microscopy studies confirm the unique microstructure where a diamond nanowall is encased by a multilayered graphene. Interestingly, these HCNWs yield a high double layer capacitance value of 0.43 mF cm -2 and electrode retention of 98% over 10 000 cycles of charging/discharging in 1 M Na 2SO 4 electrolyte. The remarkable supercapacitive performance can be attributed to the 3D interconnected network of diamond nanowalls surrounded by highly conducting graphene.

Original languageEnglish
Pages (from-to)15458-15466
JournalJournal Of Physical Chemistry C
Volume123
Issue number25
DOIs
Publication statusPublished - 27 Jun 2019

Cite this

Banerjee, D., Sankaran, K. J., Deshmukh, S., Ficek, M., Bhattacharya, G., Ryl, J., Phase, D. M., Gupta, M., Bogdanowicz, R., Lin, I-N., Kanjilal, A., Haenen, K., & Roy, S. S. (2019). 3D Hierarchical Boron-Doped Diamond-Multilayered Graphene Nanowalls as an Efficient Supercapacitor Electrode. Journal Of Physical Chemistry C, 123(25), 15458-15466. https://doi.org/10.1021/acs.jpcc.9b03628