01595nas a2200181 4500008004100000022001400041245014400055210006900199260011000268300001400378490000700392520078800399100002501187700002101212700002401233700003001257856012601287 2010 eng d a0959-942800aBio-inspired catalyst compositions for enhanced oxygen reduction using nanostructured Pt electrocatalysts in polymer electrolyte fuel cells0 aBioinspired catalyst compositions for enhanced oxygen reduction  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP a9651-96570 v203 a

Composites of Nafion with a class of bio-molecules viz., plant hormones, are explored as potential polymer electrolytes for improving the proton transport inside the catalyst layer of a H(2)/O(2) fuel cell. Specifically, four nitrogenous plant hormones, two each from the class of auxins and cytokinins have been investigated, following preliminary characterization of the composite dispersions and membranes. Interestingly, the use of indole-3-acetic acid (an auxin) in the catalyst layer reveals a 30% enhancement in Pt catalyst utilization and improved fuel cell performance by 150 mW cm(-2). The effect of these bio-molecules on the kinetic and mass transport parameters has been analyzed systematically using a combination of electrochemical and spectroscopic techniques.

1 aParthasarathy, Meera1 aKannan, Ramaiyan1 aSreekumar, Kurungot1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/bio-inspired-catalyst-compositions-enhanced-oxygen-reduction-using-nanostructured-pt-001248nas a2200229 4500008004100000022001400041245008600055210006900141260007100210300001400281490000700295520042100302653001900723653001400742653003000756653002400786100002400810700002500834700002400859700001800883856011700901 2012 eng d a0897-475600aDisordered brownmillerite Ba2InCeO5+delta with enhanced oxygen reduction activity0 aDisordered brownmillerite Ba2InCeO5delta with enhanced oxygen re a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUL a2823-28280 v243 a

A disordered brownmillerite, Ba2InCeO5+delta, with slight tetragonal distortion from ideal cubic perovskite is synthesized and its oxygen reduction reactivity tested. The material displayed oxygen reduction behavior in alkaline solution comparable to that of standard 40 wt % Pt/C catalyst and attractive activity characteristics which renders it a potential system for low temperature fuel cell applications.

10abrownmillerite10afuel cell10aoxygen reduction reaction10aRietveld refinement1 aJijil, Chamundi, P.1 aUnni, SreeKuttan, M.1 aSreekumar, Kurungot1 aDevi, Nandini uhttps://library.ncl.res.in/content/disordered-brownmillerite-ba2inceo5delta-enhanced-oxygen-reduction-activity-002336nas a2200157 4500008004100000245012200041210007100163260000800234300001400242490000600256520170400262100002201966700002701988700002402015856013902039 2018 eng d00aLayered TiO2 nanosheet‐supported NiCo2O4 nanoparticles as bifunctional electrocatalyst for overall water splitting 0 aLayered TiO2 nanosheet‐supported NiCo2O4 nanoparticles as bifunc cDEC a4000-40070 v53 aExploring the generation of efficient and long‐lasting bifunctional electrocatalysts obtained from low‐cost transition metal oxides is crucial to the optimal production of hydrogen and oxygen by electrocatalytic water splitting. This study aims to demonstrate the applicability of layered TiO2 nanosheets as support for designing electrocatalysts. We have demonstrated the performance by decorating the TiO2 support with NiCo2O4 nanoparticles (NiCo2O4/TiO2) as catalysts for electrocatalytic overall water splitting. Moreover, the corrosion effect of usually used carbon‐based supporting materials can decrease the working efficiency and, thus, the overall performance of the catalysts. In this aspect, TiO2 can be a better alternative to carbon‐based systems. Layered TiO2 was synthesized at room temperature, and a simple heat treatment protocol was employed for the large‐scale synthesis of NiCo2O4/TiO2. TiO2 facilitated the formation of smaller NiCo2O4 nanoparticles, also improving the dispersion. This bifunctional electrocatalyst exhibits high OER and HER performance with a low overpotential of 309 mV and 185 mV respectively, at a current density of 10 mA cm−2. TiO2 supported catalyst also exhibits other advantages like remarkable durability in the alkaline medium along with high turnover frequency (TOF) values. This inexpensive catalyst can deliver a current density of 10 mA cm−2 at only 1.64 V with a steady performance for more than 12 h for overall water splitting. Thus, this homemade system provides a proficient and low‐cost alternative to the more expensive systems such as RuO2, IrO2 or Pt for the electrochemical water splitting applications.1 aRaji, Vadakkekara1 aRajith, Illathvalappil1 aSreekumar, Kurungot uhttps://library.ncl.res.in/content/layered-tio2-nanosheet%E2%80%90supported-nico2o4-nanoparticles-bifunctional-electrocatalyst-overall02395nas a2200241 4500008004100000022001400041245009700055210006900152260000900221300001400230490000600244520158800250653001901838653002401857653001401881653003001895653002101925100002401946700001601970700001501986700002402001856012802025 2019 eng d a2196-021600aMedium modulated oxygen reduction activity of Fe/Co active centre-engrafted electrocatalysts0 aMedium modulated oxygen reduction activity of FeCo active centre cJUN  a2956-29640 v63 a

Iron and cobalt metal atoms are effective active centers for the synthesis of carbon-based noble-metal-free catalysts for the oxygen reduction reaction (ORR) owing to their cost-effective intrinsic activity and tunable properties. Annealing of the active center with the conducting carbon enhances the ORR activity significantly. Herein, we have engrafted Fe and Co active centers in the homemade conducting carbon and the ORR performance has been closely observed under acidic and basic pH conditions to understand the influence of the medium and participating moieties towards the performance. In the half-cell reaction, the onset potential and half-wave potential for ORR are governed by the surface intermediates and concomitantly driven by the adsorption energies of the intermediates over the active centers. The iron and cobalt active center-engrafted carbon catalyst behaves differently in acidic and basic electrolytes owing to the dissociation of the surface intermediates. The iron-based catalyst shows improved onset potential against the cobalt-based one. Similarly, the cobalt-based catalyst shows improved half-wave potential against the iron active-center-grafted catalyst. The combined synergistic effect of the two catalysts is realized in the composition represented as Fe/2Co-N-GVC, where improved onset and half-wave potentials are noted in basic medium. A significant variation in the activity of the catalyst is observed as the medium changes from acidic to basic and the effect is directly associated with the surface adsorption of the intermediates.

10aactive centers10ahalf-wave potential10aMechanism10aoxygen reduction reaction10atransition state1 aKashyap, Varchaswal1 aAnand, Aljo1 aSoni, Roby1 aSreekumar, Kurungot uhttps://library.ncl.res.in/content/medium-modulated-oxygen-reduction-activity-feco-active-centre-engrafted-electrocatalysts