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Bandal, Harshad A.,Jadhav, Amol R.,Tamboli, Asif H.,Kim, Hern Elsevier 2017 ELECTROCHIMICA ACTA Vol.249 No.-
<P><B>Abstract</B></P> <P>Water electrolysis offers an efficient way to store energy derived from renewable sources in the form of hydrogen. However, the practical implication of this technology is hindered by the lack of efficient earth abundant catalyst capable of accelerating both half reaction of water electrolysis. In this regards, herein; we have prepared a highly active composite electrode by depositing hierarchical spinel iron cobalt oxide on the surface of nickel foam. The layered morphology of iron cobalt oxide is ideal for effective transfer of electrolyte and facile dissipation of gaseous product. Moreover, intimate contact between the catalyst and the current collector caused a significant reduction in charge transfer resistance. Consequently, composite electrode displayed enhanced catalytic activity for HER and OER, achieving the benchmark current density of 10mAcm<SUP>−2</SUP> at a low overpotential of 205mV and 244mV respectively. In addition, a two-electrode alkaline water electrolyzer constructed by employing the composite electrode as anode and cathode yielded a current density of 10mAcm<SUP>−2</SUP> at an applied potential of only 1.62V. The long-lasting stability of iron cobalt oxide-Ni foam electrode along with its exceptional catalytic activity makes it a promising alternative to substitute the precious metal catalyst used in commercial water electrolyzer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spinel type iron cobalt oxide (FeCoO-NF) was successfully grown on Ni-foam. </LI> <LI> Composite electrode is binder free with excellent activity for HER and OER. </LI> <LI> Water electrolyzer constructed using FeCoO-NF reached I<SUB>d</SUB> 10mAcm<SUP>−2</SUP> at 1.62V. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Bandal, Harshad,Reddy, K. Koteshwara,Chaugule, Avinash,Kim, Hern Elsevier 2018 Journal of Power Sources Vol.395 No.-
<P><B>Abstract</B></P> <P>Oxygen evolution reaction is an integral part of energy storage technologies such as metal air batteries, water splitting, and regenerative fuel cells. However, oxygen evolution is 4 electron transfer process that suffers from sluggish reaction kinetics and indolent thermodynamics which mandates the use of a suitable noble metal catalyst. Considering the availability and cost of these precious metal catalysts, development of catalyst based on more abundant metal such as Fe is of vital interest for practical implication of these technologies. In this regards, over past few years several Fe based heterogeneous electrocatalysts are investigated for their electrocatalytic activity. Significant advances in improving the catalytic activity as well as exploring the catalytic mechanism are achieved in this area. Herein, we present an in-depth review on the recent progress in this field. Specific attention is given to design, synthesis, catalytic performance and strategies for improving their performance. A brief overview of existing challenges and future directions in the field of OER catalyst is also summarized.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recent progress in development of Fe-based heterogeneous catalyst are reviewed. </LI> <LI> Role of Fe in mixed metal catalyst is also highlighted. </LI> <LI> A brief overview of existing challenges and future directions is summarized. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Bandal, H.A.,Jadhav, A.R.,Kim, H. Elsevier 2017 Journal of alloys and compounds Vol.699 No.-
<P><B>Abstract</B></P> <P>Magnetite-multiwalled carbon nanotube nanocomposites were successfully synthesized and investigated as a catalyst for alkali free hydrolysis of sodium borohydride. Structure and morphologies of nanocomposites were studied by FT-IR, SEM-EDX, XRD and BET surface area analysis. SEM images of magnetite revealed the presence of roughly spherical nanoparticles of uniform shape and size. The introduction of carbon nanotubes caused the assembly of otherwise randomly arranged nanoparticles along the surface of carbon nanotubes. FT-IR analysis showed that the hydrophilic functional group introduced on the surface of carbon nanotubes during oxidation process are responsible for assembly of magnetite nanoparticles. The surface area of the nanocomposite was found to increase with an increase in the amount of carbon nanotubes. Catalytic activity of the nanocomposite materials was further enhanced by incorporating Co on their surface. The Co incorporated nanocomposite displayed high catalytic activity with H<SUB>2</SUB> generation rate of 1213 mL min<SUP>−1</SUP> g<SUP>−1</SUP> at room temperature. Furthermore, catalyst could be easily recycled and displayed good stability for 5 recycles making it suitable for commercial application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cobalt incorporated Fe<SUB>3</SUB>O<SUB>4</SUB>-Carbon nanotube nanocomposites are synthesized. </LI> <LI> Highly active catalyst for NaBH<SUB>4</SUB> hydrolysis. </LI> <LI> H<SUB>2</SUB> production rate of 1213 mL g<SUP>−1</SUP> min<SUP>−1</SUP> was achieved at room temperature. </LI> <LI> Activation energy of reaction catalyzed by 5%Co-FeCNT nanocomposite was 42.79 kJ mol<SUP>−1</SUP> </LI> <LI> Magnetically recoverable catalyst. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hierarchical Zn-Cu/Poly(ionic liquid)/CNT Hybrids for Efficient CO₂ Electroreduction
Harshad Bandal,김헌 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Electrochemical CO₂ reduction reaction (CO₂RR) is an important CO₂ sequestration technique that offers a way of storing energy derived from the renewable sources in the form of chemical fuels. However, low product selectivity towards C2+ products, and poor catalyst stability are major challenges that must be addressed before practical application of CO₂RR. Here we report synthesis a hybrid consisting of bimetallic Zn-Cu immobilized on CNT/poly(ionic liquid) (PIL) composite as a catalyst for CO₂RR. CO₂-philic PIL not only improved the CO₂RR activity by modulating the local CO₂ concentration around catalytically active metal centers but also supressed the competing hydrogen evolution reaction due to hydrophobic nature of its anions. Moreover, CNT in the composite boosted the electrical conductivity of the hybrid. The synergistic effect of these phenomenon culminated in efficient CO₂RR performance of the composite which surpassed the activity of individual components of the composite.
( Harshad Bandal ),( Amol Jadhav ),김헌 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The Ni-Ce/sulphonated carbon nanotube composites with different Ni:Ce ratios were prepared by an efficient and rapid microwave assisted solvothermal method. Prepared materials were characterized by electron microscopy, XRD, FT-IR spectroscopy, NH<sub>3</sub>-TPD and BET surface area analysis. Catalytic activity of this catalyst was studied at different experimental conditions for hydrolysis of sodium borohydride. Present catalyst showed excellent catalytic activity as well as recyclability. The high catalytic activities were due to synergetic effect of metal and surface acidity of support.
Ni nanoparticle decorated reduced graphene oxide sheet catalyst for electrochemical water splitting
( Harshad Bandal ),김헌 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Ni nanoparticle decorated reduced graphene oxide sheets were synthesized by ligand assisted assembly method. As prepared Ni-RGO composite was investigated as catalyst for hydrogen evolution reaction. Immobilization of nickel on graphene oxide surface was found to enhance its catalytic activity. The composite material required low over potential of 128 mV and 197mV to reach current density of 1 mA g-1 and 10 mA g-1 respectively. Tafel analysis showed a low Tafel slope of 67 mV decade-1 suggesting that that reaction follows Volmer-Tafel mechanism. Furthermore catalyst was reused for 100 cycles without appreciable loss in catalytic activity.