ChemCatChem p. 1617 - 1629 (2020)
Update date:2022-08-17
Topics:
Chaudhuri, Haribandhu
Karak, Niranjan
A new reduced graphene oxide (rGO) based bi-phasic crystal of MnO2, namely α-MnO2 nanorods and δ-MnO2 nanoflakes containing heterostructured hybrid nanoflower rGO@α-MnO2/rGO@δ-MnO2 has been fabricated through a facile hydrothermal method followed by annealing treatment. The successful synthesis of the hybrid material was studied by XRD, Raman, BET, FESEM with EDX, FTIR and TEM analyses. An efficient N-alkylation reaction of substituted aromatic amines with aromatic alcohols was carried out under solvent-free aerobic conditions in the presence of catalytic amount of rGO@α-MnO2/rGO@δ-MnO2. The catalyst shows excellent activity in terms of high yields (up to 98 %), short reaction time (10 h) along with a simple work-up process. The spent material can be regenerated several times without causing any serious decrease in catalytic activity. Moreover, cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and cyclic stability techniques were executed to evaluate the performances of rGO@α-MnO2, rGO@δ-MnO2, and rGO@α-MnO2/rGO@δ-MnO2 as energy storage materials. Among all those materials, rGO@α-MnO2/rGO@δ-MnO2 exhibited a proficient specific capacitance, CS (267 F/g at 1 A/g) along with excellent cycling ability (~83 % retention up to 10000 cycles). The superb electrochemical performance of rGO@α-MnO2/rGO@δ-MnO2 might be ascribed to the combination of bi-phasic α-MnO2 and δ-MnO2 with rGO sheets, resulting in a flower-like structure.
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