A synthetic route to low-density porous Ni-doped Co3O4 nanomaterials that show stable and superior electrocatalytic activity for O2 evolution reaction is reported. The materials are prepared via thermal treatment of "pre-synthesized" metal ions-embedded graphitic C3N4-based polymers.

To fully exploit the superiority of tubular structures, in this study, we systematically explore optimal preparation conditions for Ni/Co3O4, including cation species and content, additive anion species. Our results reveal that formation an initial cobalt nickel acetate hydroxide prism is key factor directly affects final microtubular structure. Moreover, P subsequently doped into Ni/Co3O4 latt...

The properties of Te-doped CosSb1−yTeyd3 and Te-Ni double-doped Co1−xNixsSb1−yTeyd3 nanostructured skutterudites were evaluated by means of x-ray powder diffraction, and transport properties measured on the synthesized samples have been compared with ab initio theoretical modeling. Theoretical optimal dopant contents have been evaluated according to the maximum value of the power factor, calcul...

We demonstrate a new strategy for tuning the size of large-diameter and few-walled nitrogen-doped carbon nanotubes (N-CNTs) from 50 to 150 nm by varying the transition metal (TM = Fe, Co, Ni or Mn) used to catalyze graphitization of dicyandiamide. Fe yielded the largest tubes, followed by Co and Ni, while Mn produced a clot-like carbon morphology. We show that morphology is correlated with elec...

A density functional theory (DFT) study has been carried out on transition metal phosphates with olivine structure and formula LiMPO4 (M = Fe, Mn, Co, Ni) to assess their potential as cathode materials in rechargeable Li-ion batteries based on their chemical and structural stability and high theoretical capacity. The investigation focuses on LiMnPO4, which could offer an improved cell potential...

The adsorption of small molecules such as NO or CO on surfaces of magnetic oxides containing transition metals is difficult to model by current density functional approximations. Two such oxides are NiO(100) and Ni-doped MgO(100). Here we compare the results of a theoretical model of the Ni-doped MgO(100) surface with experimental results on NiO(100), which introduces some uncertainty into a qu...

We report structural and electrical properties of catalyst-free Si-doped InAs nanowires (NWs) formed on Si(111) substrates. The average diameter of Si-doped InAs NWs was almost similar to that of undoped NWs with a slight increase in height. In the previous works, the shape and size of InAs NWs formed on metallic catalysts or patterned structures were significantly changed by introducing dopant...

In photoelectrochemical cells, sunlight may be converted into chemical energy by splitting water into hydrogen and oxygen molecules. Hematite (α-Fe(2)O(3)) is a promising photoanode material for the water oxidation component of this process. Numerous research groups have attempted to improve hematite's photocatalytic efficiency despite a lack of foundational knowledge regarding its surface reac...

Gas selective sensors that are capable of sensing at hot-gas environment increasingly gaining importance for the monitoring combustion and thermal processes releasing NO, NO2 H2 containing hot gases temperatures exceeding 600 °C. Despite some drawbacks, TiO2 is operating as a gas sensor above 500 In this context, Ni-doped TiO2, Co-doped Rh-doped BaTiO3 have been prepared by oxalate coprecipitat...

In this paper, a rapid and room temperature electrochemical method is introduced in preparationof Ni doped iron oxide nanoparticles (Ni-IONs) grafted with ethylenediaminetetraacetic acid (EDTA)and polyvinyl alcohol (PVA). EDTA/Ni-IONs and PVA/Ni-IONs samples were prepared through baseelectro-generation on the cathode surface from aqueous solution of iron(II) chloride, iron(III...