NiII1,4,8,11-tetraazacyclotetradecane electrocatalytic films prepared on top of surface anchored PAMAM dendrimer layers. A new type of electrocatalytic material for the electrochemical oxidation of methanol.
Gold electrodes, previously prepared with surface anchored PAMAM dendrimers, were further modified with a Ni-containing tetraazamacrocycle resulting in a novel electrocatalytic material which proved to be particularly efficient for the electrochemical oxidation of methanol in basic aqueous medium.
Characterization of Conductive Polymeric Nickel(II) Tetrakis(3‐methoxy‐4‐hydroxy‐phenyl)Porphyrin as an Anodic Material for Electrocatalysis
Highly conductive film has been obtained by oxidative polymerization of nickel(II) tetrakis(3‐methoxy‐4‐hydroxy‐phenyl)porphyrin, Ni(II)TMHPP. This material was characterized by voltammetry, ac impedance, UV‐visible spectroscopy, and x‐ray photoelectron spectroscopy. The application of polymeric Ni(II)TMHPP as an anode for catalytic oxidation of water, methanol, and hydrazine in basic media is discussed.
A comparison of experimental thermal stratification parameters for an oil/pebble-bed thermal energy storage (TES) system during charging
Six different experimental thermal stratification evaluation parameters during charging for an oil/pebble-bed TES system are presented. The six parameters are the temperature distribution along the height of the storage tank at different time intervals, the charging energy efficiency, the charging exergy efficiency, the stratification number, the Reynolds number and the Richardson number. These parameters are evaluated under six different experimental charging conditions. Temperature distribution along the height of the storage tank at different time intervals and the stratification number are parameters found to describe thermal stratification quantitatively adequately. On the other-hand, the charging exergy efficiency and the Reynolds number give important information about describing thermal stratification qualitatively and should be used with care. The charging energy efficiency and the Richardson number have no clear relationship with thermal stratification.