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LSV responses to the same electrode in PBS buffer solution with increasing hydroquinone concentration of 0.3, 0.5, 0.7, 0.9, 1.0, 3.0, 5.0, 7.0 and 9.0 mmol/L from a to i. Graphene-PANI: 8 μL, Tyr: 3 μL, Nafion: 2 μL, pH: 6.5, scan range: −0.2–1.6 V, scan rate: 50 mV/s.
