We
have demonstrated the synthesis of defect-rich Ni-doped MoSe2 nanoplates (NiMoSe2) and their application as
an efficient electrocatalyst for enzymatic biofuel cells and electrochemical
pseudocapacitors. In this study, a new type of interpretation is proposed
that a defective surface facilitates the effective entrapment of enzymes
(glucose oxidase (GOD), laccase) for biofuel cells and additional
ion diffusion for Faradic charge–discharge reaction. The transmission
electron microscopy and UV–vis spectroscopy techniques scrutinized
the formation of defects/distortions and the resultant successful
entrapment of enzymes. The performed electrochemical characterizations
of enzyme-immobilized NiMoSe2/nickel foam (NF) bioanode
(NiMoSe2/GOD/NF) and biocathode (NiMoSe2/laccase/NF)
exhibited better direct charge conductive behavior at the interface
of enzymes and electrode material. Herein, the assembled biofuel cells
exhibited an open-circuit voltage (V
OC = 0.6 V) and a short-circuit current density (J
SC = 8.629 mA cm–2) with a maximum power
density (P
max) of 1.2 mW cm–2. For the electrochemical pseudocapacitor application, the proposed
NiMoSe2/NF exhibited excellent specific capacitance (535.74
F g–1), with 86.7% rate performance. Finally, this
work suggests new insights into both enzymatic biofuel cell and supercapacitor
applications.
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