Phase control of nanostructured iron oxide for application to biosensor

Sharma, Rahul Swarup; Agrawal, Ved Varun; Srivastava, A. K.; Govind,; Nain, Lata; Imran, Mohd; Kabi, Soumya Ranjan; Sinha, R. K.; Malhotra, Bansi D.

doi:10.1039/c2tb00192f

Cited by 40 publications

(44 citation statements)

References 64 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 shows a typical XRD trace of one of our electrodes after 50 cycles of charge and discharge. This figure confirms the presence of a-Fe but we haven't found any evidence of other polymorphs of iron (neither b-Fe nor g-Fe), nor we have found compelling evidence of the presence of the spinel Fe 3 O 4 [41]; however, we had found a weak signal appearing approximately at 2q ¼ 24 which would correspond to either aFe 2 O 3 or Fe(OH) 2 ; note the transformation of Fe 3 O 4 into a-Fe 2 O 3 have been reported to be possible [42]. From the XRD analysis, it follows that all observed sulphur related peaks belong to diffraction reflections of hexagonal iron sulphide (P6 3 /mmc, space group 194).…”

Section: Resultscontrasting

confidence: 58%

Controlling hydrogen evolution on iron electrodes

Posada

Hall

2015

2015 3rd International Renewable and Sustainable Energy Conference (IRSEC)

View full text Add to dashboard Cite

Available online xxx Keywords:Iron electrode NiFe Electrolyte decompositionCell performance Hydrogen evolution a b s t r a c t Aiming to develop a cost effective means to store large amounts of electric energy, NiFe batteries were produced and tested under galvanostatic conditions at room temperature.Multiple regression analysis was conducted to develop predictive equations that establish a link between hydrogen evolution and electrode manufacturing conditions, over a wide range of electrode/electrolyte systems. Basically, the intent was to investigate the incidence of lithium hydroxide and potassium sulphide as electrolyte additives on cell performance. With this in mind, in-house built Fe/FeS based electrodes were cycled against commercially available nickel electrodes on a three electrode cell configuration. A 3 Â 4 full factorial experimental design was proposed to investigate the combined effect of the aforementioned electrolyte additives on cell performance. As a consequence, data from 144 cells were finally used in conducting the analysis and finding the form of the predictive equations. Our findings suggest that at the level of confidence alpha ¼ 0.05, the presence of relatively large amounts of the soluble bisulphide would enhance the performance of the battery by reducing electrolyte decomposition.

show abstract

Section: Resultscontrasting

confidence: 58%

Controlling hydrogen evolution on iron electrodes

Posada

Hall

2015

2015 3rd International Renewable and Sustainable Energy Conference (IRSEC)

View full text Add to dashboard Cite

show abstract

“…The Fe 3 O 4 NPs have been prepared via hydrolytic reaction based on chemical co‐precipitation of metal salts with an alkali as reported earlier 5. Briefly, 0.32 M FeCl 2 and 0.64 M FeCl 3 were added to 2 mL of deoxygenated water (containing 12.1 N HCl) with continuous stirring at 30 °C.…”

Section: Methodsmentioning

confidence: 99%

“…However, the inclination of Fe 3 O 4 NPs towards oxidation and agglomeration limits its applications. Encasing Fe 3 O 4 colloids in a shell of different material may prevent oxidation and agglomeration of Fe 3 O 4 NPs 5. In particular, capping of Fe 3 O 4 NPs with Prussian blue (PB), an electroactive material, can prevent oxidation and agglomeration of NPs alongwith enhancing their electrochemical activity.…”

Section: Introductionmentioning

confidence: 99%

Electroactive Prussian Blue Encapsulated Iron Oxide Nanostructures for Mediator‐Free Cholesterol Estimation

2014

Self Cite

View full text Add to dashboard Cite

Iron oxide nanoparticles of size ∼10 nm have been encapsulated into four nanometer thick shells of Prussian blue and were then electrophoretically deposited onto an indium tin oxide substrate. The immobilization of cholesterol oxidase has been done onto the nanostructured film to investigate the kinetic parameters and biosensing characteristics. The fabricated bioelectrode exhibits an electron transfer coefficient and a charge transfer rate constant of 0.45 and 45.15 s−1, respectively. Direct electron transfer properties of the nanostructured film result in 3rd generation cholesterol biosensor. The bioelectrode exhibits high sensitivity (2.15 mAM−1 cm−2), a low Kmapp value (0.07 mM), good stability and high selectivity towards cholesterol.

show abstract

“…Thus, this nanomaterial can be functionalized with 62 different materials including chitosan, carbon, polymers, 63 surfactants, bio-molecules, silica, metals, small polar molecules 64 including citric acid (CA) etc. [2,11,12] biodetection [10,11,19]. De Sousa [30].…”

Section: Introductionmentioning

confidence: 99%