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Impact of Mixed Inhibitor on Electrochemical Behavior of Inland Water Biofilm Formed on 316L Stainless Steel
No full textThe electrochemical behavior of biofilm on AISI 316L stainless steel was studied in the mixed inhibitor system:
amino trimethylene phosphonic acid with zinc sulfate (ATMP + Zn2+) added inland water system. The natural biofilm shifts
potential toward positive side, about 380 mV vs SCE and in the presence of inhibitor, the biofilm does not shift the potential
toward positive side. Cathodic polorization and cyclic voltammogram explained the presence of manganese oxide and peroxide in
the natural biofilm. There were no oxidation and reduction peak in the inhibitor treated (industrial) biofilm because of removal
of cations in the biofilm by inhibitor. The natural biofilm has thick matrix with extracellular polysaccharides (EPS) on 316L SS. In
the presence of inhibitor in the water, distinct rod shaped cells were noticed without any EPS. The inhibitor added system
showed the lowest passive current (ip) and high resistance (Rct) when compared to the natural biofil
Surface termination dependent structural and magnetic properties of (0001) SmCo5 slabs
No full textWe employ first principles calculations to understand the
surface termination dependent structural and magnetic properties
of (0001) SmCo5 surface slabs. For our study, three
different sub-layer terminated surface slabs, namely Co3–
(SmCo2–Co3)n, SmCo2–(Co3–SmCo2)n, and (Co3–SmCo2)n
with thicknesses varying from n ¼ 1 to n ¼ 10, are considered.
Our results revealed that the Co3 sub-layer terminated surface
slab (first case) has higher structural stability, spin polarization,
and work function when compared to the other two cases and
such terminated surface slabs can be potentially used for
fabricating exchange-coupled magnet
Functionalization of electrochemically deposited chitosan films with alginate and Prussian blue for enhanced performance of microbial fuel cells
No full textFunctionalization of electrochemically deposited chitosan
films with alginate and Prussian blue for enhanced
performance of microbial fuel cell
Shape-influenced magnetic properties of CoO nanoparticles
No full textUsing a wet chemical approach, CoO
nanospheres, nanorings, nanoflowers, and nanowires
of different sizes were generated. Among those,
nanorings show ferromagnetic behavior below 6 K
while the nanospheres remain paramagnetic. X-ray
photoelectron spectroscopy for Co 2p, 3p, and 3s corelevels
indicates the paramagnetic high-spin Co(II)
electronic configuration. This finding reveals the
optical, electronic, and magnetic behavior of CoO
nanoparticles (NPs) that opens new opportunities for
future applications as catalysts precursors for making
pigments, lithium-ion battery materials, or as solidstate
sensors as anisotropy source for magnetic
recordin
Carbonate anion controlled growth of LiCoPO4/C nanorods and its improved electrochemical behavior
No full textLiCoPO4/C nanocomposite with growth controlled by carbonate anions was synthesized via a unique
solid-state fusion method. Carbonate anions in the form of H2CO3 or a mixture of H2CO3 + (NH4)2CO3 have
been used as a growth inhibiting modifier to produce morphology controlled lithium cobalt phosphate.
The presence of cobalt phosphide (Co2P) as a second phase improved the conductivity and electrochemical
properties of the parent LiCoPO4. The formation of Co2P is found to be achievable only in an inert
atmosphere. Super P® carbon (10 wt.%) provided an adherent carbon coating on pristine LiCoPO4 resulting
in the LiCoPO4/C composite cathode. This electrode exhibited enhanced electrochemical properties:
capacity of 123 mAh g−1 with excellent capacity retention of 89% after 30 cycles, and reasonable rate
capability of up to 5 C rate. The synergistic effect of carbonate anions and formation of Co2P under inert
atmosphere has influenced the electrochemical behavior of LiCoPO4/C cathode through controlling the
morphology and increasing the conductivity
Effect of surface modifiers in improving the electrochemical behavior of LiNi0.4Mn0.4Co0.2O2 cathode
No full textSurface modification of LiNi0.4Mn0.4Co0.2O2 (4 4 2) compound with certain metal oxides viz., Al2O3, Bi2O3
and In2O3 has been attempted with a view to improve the structural and cycling stability, especially upon
high voltage and high rate cycling conditions. In addition to HF scavenging effect, the protective metal
oxide inter-connect layer restricts the number of oxide ion vacancies eliminated during the initial cycling
of cathode, resulting in the reduced irreversible capacity loss of the first cycle. Among the surface modified
cathodes, Bi2O3 coated LiNi0.4Mn0.4Co0.2O2 cathode exhibits appreciable specific capacity values of
196 mAh g−1 (Qdc1) and 175 mAh g−1 (Qdc100) with 89% capacity retention, thus evidencing the superiority
of Bi2O3 modifier in improving the electrochemical behavior of pristine LiNi0.4Mn0.4Co0.2O2 cathode.
Further, suitability of Bi2O3 coated LiNi0.4Mn0.4Co0.2O2 cathode for high voltage (5.0 V) and high rate (3 C)
lithium intercalation and de-intercalation applications has been demonstrated up to 100 cycles. Based
on the extent of improvement in electrochemical behavior, the cathodes under investigation could be
arranged in the order: Bi2O3 coated > Al2O3 coated > In2O3 coated > uncoated LiNi0.4Mn0.4Co0.2O2 oxide
Durability of Pt/C and Pt/MC-PEDOT Catalysts under Simulated Start-Stop Cycles in Polymer Electrolyte Fuel Cells
No full textSol–gel synthesis and impedance characteristics of networked nanocrystalline olivine cathode for Li-ion full cells
No full textA sol–gel synthesis using adipic acid yielded small particles of around 20 nm in size of olivine LiFePO4/C
cathode materials. In the characterization of cathode system(s), solid state impedance spectra of the
pristine LiFePO4/C cathode revealed clear localization of charge through charge build-up.
When networked with MWCNT, this material facilitates enhancement in charge mobility, eventually
explaining the capacity enhancement of the LiFePO4/C–MWCNT electrode, which yields a high capacity
of 163 mA h g�1 at C/10. On the other hand, the lower capacity of 125 mA h g�1 found for the pristine
LiFePO4/C electrode material can be explained in terms of charge becoming localized/trapped in the
vicinity of inter- and intra-granular regions of the cathode particles. To get a broader view of the
application potential (in terms of cell voltages of �3 V, 2 V, and safety aspects) of the networked
cathode materials, two kinds of Li-ion full cells using mesocarbon microbeads (MCMB) and Li4Ti5O12 as
anodes were fabricated, which yielded capacities of 1.94 and 2.1 mA h respectivel
Multi-Walled Carbon Nanotubes Percolation Network Enhanced the Performance of Negative Electrode for Lead-Acid Battery
No full textThe discharge performance of lead-acid battery is improved by adding multi-walled carbon nanotubes (MWCNTs) as an alternate
conductive additive in Negative Active Mass (NAM).We report thatMWCNTs added to the negative electrode, exhibits high capacity,
excellent cycling performances at 10-h rate, high rate partial state of charge (HRPSoC) cycling and various rates of discharge. It
significantly reduces the irreversible lead sulfate on the NAM, increases the active material utilization and improves the electrode
performance. The improvement of capacity and cyclic performance of the cell is attributed to the nanoscale dimension of the
MWCNTs as additive. Subsequent characterization using high resolution transmission electron microscopy and scanning electron
microscopy were carried out to understand the influence of MWCNTs on the negative electrode of lead-acid battery
Electrodeposition of nickel on boron-doped diamond from an air-stable methyl sulphate anion based ionic liquid
No full textElectrodeposition of nickel had been successfully carried out for the first time in the ionic liquid triethylmethylammonium
methyl sulphate (TEMAMS) on boron-doped diamond (BDD) along with glassy
carbon electrode (GC). The electrochemical reduction of Ni (II) ions takes place slightly at a more positive
potential on the BDD than the GC in this medium. The nickel deposition proceeds via three-dimensional
instantaneous nucleation on the BDD and progressive on the GC. Surface morphologic characteristics of
Ni deposits obtained on the BDD and GC at different deposition potentials were characterised by SEM
and AF