Abstract
Bioinspired nitrogen-rich carbon-coated zeolitic imidazolate framework-8 (NRC@ZIF-8) has been prepared by simple impregnation and carbonization of novel N rich C source “nitrodopamine” (NDA) with ZIF-8 through eco-friendly solvothermal approach and employed as an electrocatalyst for oxygen reduction reaction (ORR). Fabricated NRC@ZIF-8 nanocomposite-based electrode offers surprisingly high ORR electrocatalytic activity by providing high anchoring sites for O2 adsorption due to the availability of positively charged N atoms of nitro group, increased surface defects, improved surface compatibility, promote heterolytic O–O bond cleavage rather than homolytic cleavage and offer fast electron transportation capability. Additionally, it improves interfacial binding efficacy due to functionalization of nitro group with ZIF-8, thus leading to high half wave potential value (E1/2 = 0.91 V), high tolerance against methanol poisoning (91.88%) and remarkable stability even better than dopamine (DA) derived nitrogen carbon-coated ZIF-8 (NC@ZIF-8), commercial Pt/C and other related bioinspired materials.
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