Electrical conductivity of transition metal containing crystalline zirconium phosphate materials

Comparative study of layered tetravalent metal phosphates containing various first-row divalent metals. Synthesis, crystalline structure

“…The original tetravalent metal phosphates have one mol crystal water per molecule unit, while their transition metalcontaining forms have about 2.41(Co), 1.25(Ni), 1.80(Mn), 1.04(Cu) and 2.38(Zn) mole per unit molecule [28][29][30]. They are identical within the error of measurement and about one order of magnitude higher than that of the original (free from transition metal ions) phosphates.…”

“…X-ray diffraction patterns of zirconium-, and titanium phosphates in form of fully loaded with transition metal ions, were published previously [33,34]. Therefore, in this paper, only the fragment of XRPD pattern of transition metal containing α-HfP is presented on Fig.…”

Transition Metal-Modified Zirconium Phosphate Electrocatalysts for the Oxygen Evolution Reaction

“…Increasing the M:ZrP molar ratio had a direct increase in metal content observed by XPS which correlated to an increase in activity for all metal systems. Consequently, as observed by electrochemical cyclic voltammetry, the metal species that were supported within ZrP required While at this stage the mechanism of OER catalysis remains unclear for either the metal-intercalated ZrP or the metal-adsorbed ZrP, a further question involves conductivity, as the intercalation of metals within the interlayers could affect the conductivity of the ZrP nanoparticle [56]. Furthermore, all systems, apart from Ni(II), exhibited diminishing stability with continued cycling ( Figure S4).…”

“…Given that, in general, OER activities for the metal-adsorbed ZrP catalysts are greater than or equal to those of their metal-intercalated counterparts at the same loading, it is likely that the OER is dominated by catalysis on the outer surface of the ZrP supported metal-based systems rather than within the layers, which may be limited by mass transport. While at this stage the mechanism of OER catalysis remains unclear for either the metalintercalated ZrP or the metal-adsorbed ZrP, a further question involves conductivity, as the intercalation of metals within the interlayers could affect the conductivity of the ZrP nanoparticle [56]. Furthermore, all systems, apart from Ni(II), exhibited diminishing stability with continued cycling ( Figure S4).…”

Inclusion of L-Alanine, L-Arginine, L-Aspargine, L-Serine and Proline into θ-Type Zirconium Phosphate

“…PO 4 .H 2 PO 4 .2H 2 O are well known compounds, (where M = Ti, Zr, Hf, Sn, Ce). These materials contain structural POH groups with labile protons and therefore potential candidates as Intercalates [10], ionic co-conductance materials [11], solid acid catalysts [12] and sensors [13].…”