Order-disorder and ionic conductivity in calcium nitride-hydride.

Recently nitrogen-hydrogen compounds have successfully been applied as co-catalysts for mild conditions ammonia synthesis. CaNH was shown to act as a H sink during reaction, with H atoms from its lattice being incorporated into the NH(g) product. Thus the ionic transport and diffusion properties of the N-H co-catalyst are fundamentally important to understanding and developing such syntheses.

Ionic conductivity and disorder in calcium and barium nitrogen hydrogen phases.

Nitrogen-hydrogen based alkali and alkaline earth metal compounds have recently received a substantial amount of attention as co-catalysts for heterogeneous mild condition ammonia synthesis (MCAS). The incorporation of these materials has been shown to result in positive reaction orders with respect to H, solving the issue of hydrogen poisoning, , the occupation of the majority of transition metal (TM) active sites by H-adatoms due to the significantly faster kinetics of H dissociation as compared to N. The mechanism that underlies this is thought to be the incorporation (sinking) of H-adatoms from the surface of TMs to the bulk of the N-H phases.

Plastic recognition and electrogenic uniport translocation of 1-, 2-, and 3-row transition and post-transition metals by primary-active transmembrane P-type ATPase pumps.

Transmembrane P-type ATPase pumps catalyze the extrusion of transition metal ions across cellular lipid membranes to maintain essential cellular metal homeostasis and detoxify toxic metals. Zn(ii)-pumps of the P-type subclass, in addition to Zn, select diverse metals (Pb, Cd and Hg) at their transmembrane binding site and feature promiscuous metal-dependent ATP hydrolysis in the presence of these metals. Yet, a comprehensive understanding of the transport of these metals, their relative translocation rates, and transport mechanism remain elusive.

Hydrogen ionic conductors and ammonia conversions.

Electrochemical and catalytic conversion to and from ammonia is strongly enhanced by appropriate choice of hydrogen conducting electrolyte or substrate. Here we explore both protonic and hydride ionic conductors in relation to ammonia conversions. Protonic conductors tend to require too high a temperature to achieve sufficient hydrogen flux for ammonia synthesis as thermal decomposition competes strongly.