Nature is a valuable source of inspiration in the design of catalysts, and various approaches are used to elucidate the mechanism of hydrogenases, the enzymes that oxidize or produce H2. In FeFe hydrogenases, H2 oxidation occurs at the H-cluster, and catalysis involves H2 binding on the vacant coordination site of an iron centre. Here, we show that the reversible oxidative inactivation of this ...

High incident energy hydrogen and/or oxygen cations are generated by electron cyclotron resonance system, and then used to highly efficiently modify multi-walled carbon nanotubes (MWCNTs). The effects of various H2/O2 gas compositions on the modification process are studied. A systematic characterization method utilizing a combination of X-ray photoelectron spectroscopy (XPS), scanning electron...

Conventional supported Pt catalysts have often been prepared by loading Pt onto commercial supports, such as SiO2, TiO2, Al2O3, and carbon. These catalysts usually have simple metal-support (i.e., Pt-SiO2) interfaces. To tune the catalytic performance of supported Pt catalysts, it is desirable to modify the metal-support interfaces by incorporating an oxide additive into the catalyst formula. H...

The direct synthesis of hydrogen peroxide from hydrogen and oxygen has been investigated in a capillary and a stacked microreactor, where Pd/C catalyst was coated on the silicone wall of a microchannel. In order to make the system of H2O2 production compact, a flow-through solid polymer electrolyte (SPE) electrolyzer, which was used for the evolution of H2 and O2 instead of gas cylinders, was c...

We present the first calculation of Europa’s sputtering (ion erosion) rate as a function of position on Europa’s surface. We find a global sputtering rate of 2 10 H2O s , some of which leaves the surface in the form of O2 and H2. The calculated O2 production rate is 1 10 O2 s , H2 production is twice that value. The total sputtering rate (including all species) peaks at the trailing hemisphere ...

Photobiological hydrogen (H2) production is a promising renewable energy source. HydA hydrogenases of green algae are efficient but O2-sensitive and compete for electrons with CO2-fixation. Recently, we established photoautotrophic H2 system based on anaerobic induction, where the Calvin-Benson cycle inactive O2 scavenged by an absorbent. Here, employed thin layer cultures, resulting in three-f...

The global potential energy surfaces of singlet and triplet H2O4 systems have been searched at the B3LYP/ 6-311G(d, p) level of theory; their relative energies have been calculated at the G2M(CC5)// B3LYP/6-311G (d, p) level. The results show that the most stable intermediate out of the 11 open-chain and cyclic dimers of HO2 is the singlet HO4H chain-structure with C1 symmetry which lies 19.1 k...

A cytocompatible inkjet bioprinting approach that enables the use of a variety of bioinks to produce hydrogels with a wide range of characteristics is developed. Stabilization of bioinks is caused by horseradish peroxidase (HRP)-catalyzed cross-linking consuming hydrogen peroxide (H2 O2 ). 3D cell-laden hydrogels are fabricated by the sequential dropping of a bioink containing polymer(s) cross-...

The reaction between hydrogen and chlorine shows resemblance to that between hydrogen and bromine but is considerably more complicated, owing to the larger number of elementary processes that play a significant part in it. The reaction scheme proposed for the hydrogen-chlorine reaction differs in several important respects from that for the hydrogen-bromine reaction. The main differences are se...