Covalently Grafted Ionic Liquid−Graphene Based Electrochemical and
Dr. Prasenjit Bhunia
Department of Chemistry
Silda Chandra Sekhar College
Jhargram, West Bengal
Two-dimensional π-conjugated structure
Excellent electron acceptors and transporters
Also, able to accelerate electron transfer and
effectively suppress charge recombination
A metal- or metal oxide-free efficient photoelectrocatalyst and electrocatalyst with ionic liquid (1-(3-aminopropyl)-3-
methylimidazolium bromide (IL−NH2): Decom. Temp. >300 °C)
Why Ionic Liquid?
Impart excellent conductivity to the RGO nanosheets
Reduce the electronic band gap of RGO
Act as a stabilizer for providing stable dispersion (essential for device fabrication)
Act as a binder (for obtaining a stable film on the ITO substrate)
β-nicotinamide adenine dinucleotide (NADH)
NADH and its oxidized form (NAD+) (i.e., NADH/NAD+ couple) comprise the cofactor system for
more than 300 dehydrogenase enzymes
The NADH/NAD+ couple indeed plays a vital role in biological electron transport
Selected as model biomolecule in this study to demonstrate the proof of concept
That measures the concentration of certain target molecule by
oxidizing or reducing the target molecule at an electrode through
measuring the resulting current.
Coupling of photoirradiation with electrochemical detection and
then measuring the resulting current.
N-RGO-IL (-0.05 V), IL-RGO (0.0 V) & RGO-control (0.25 V)
Successive addition: 5 μM NADH
R2 = 0.98
R2 = 0.99
R2 = 0.97
1. Bhunia and Dutta, ACS Appl. Electron. Mater. 3, 2021, 4009−4017.
2. Bhunia and Dutta, Ind. Eng. Chem. Res. 60, 2021, 8035–8042.
3. Bhunia and Dutta, Electrochem. Sci. Adv. 2021, e2100050. doi.org/10.1002/elsa.202100050.
Ionic liquid has been covalently grafted with RGO nanosheets in a single step
The hybrid material has been successfully applied as a photoelectrocatalyst towards NADH detection
The hybrid material, after some modification has also been used as an efficient electrocatalysts towards