Sub-micron sized polyhedral shaped NiMn 2 O 4 particles were successfully prepared by a glycine assisted solution combustion method. The phase purity and the presence of functional groups in NiMn 2 O 4 were revealed through X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The formation of polyhedral shaped particles was inferred by field emission scanning electron microscopy (FE-SEM). The negative temperature coefficient of resistance (NTCR) behaviour of NiMn 2 O 4 was observed using a solid state impedance analyser in the measured temperature range between 30 and 180 C. Further, electrochemical studies revealed that NiMn 2 O 4 stores the charge through intercalation rather than by a capacitive mechanism. The electrode stores 91% of the specific capacitance by intercalation and 9% by a capacitive mechanism. Also, NiMn 2 O 4 possesses a specific capacitance of 202 F g À1 at 0.5 mA cm À2 in 1 M Na 2 SO 4 electrolyte and exhibits excellent cyclic stability over 15 000 cycles. Similarly, the fabricated asymmetric device (FeVO 4 kNiMn 2 O 4 ) also delivers good specific capacitance (50 F g À1 at 1 mV s À1 ) and cyclic stability.
The detailed facile synthesis and material characterizations of NdNiO3 nanoparticles for a non-enzymatic glucose sensor application were discussed briefly in this paper.
Developing
a novel electrode material with better electrochemical behavior and
extended cyclability is a major issue in the field of hybrid capacitors.
In this work, we propose a novel strategy for the facile synthesis
of nickel–cobalt pyrophosphate nanoparticles anchored on graphitic
carbon nitride (NiCoP
2
O
7
/g-C
3
N
4
) via the simple solvothermal method. Field emission scanning
electron microscopy and transmission electron microscopy analysis
revealed the uniform anchoring of NiCoP
2
O
7
nanocomposite
on g-C
3
N
4
nanosheets. Benefitting from the effect
of amorphous nature and a conductive matrix of the NiCoP
2
O
7
/g-C
3
N
4
(NP3) composite, the material
achieves a specific capacitance of 342 F g
–1
at
a scan rate of 5 mV s
–1
. Impressively, the electrode
shows long-term cycling stability with 100% capacitance retention
over 5000 cycles. Employing activated carbon as an anode and as-prepared
NP3 as a cathode, the assembled asymmetric hybrid cell exhibits high-energy
density and exceptional cyclability (specific capacitance retention
over 10 000 cycles). The outstanding electrochemical and cyclic
stability is attributed to the shortest electron-ion pathway with
effective interfacial interaction. The low electronic resistance of
the NiCoP
2
O
7
/g-C
3
N
4
nanocomposite
is revealed by varying the bias voltage variation in the electrochemical
impedance spectroscopy. Our results promise better utilization of
the bimetallic pyrophosphate-anchored g-C
3
N
4
matrix as a potential electrode for high-performance energy storage
devices.
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