Polyoxometallates@zeolitic-imidazolate-framework derived bimetallic tungsten-cobalt sulfide/porous carbon nanocomposites as efficient bifunctional electrocatalysts for hydrogen and oxygen evolution

Bimetal–organic framework derived multi-heterostructured TiO2/CuxO/C nanocomposites with superior photocatalytic H2generation performance

“…4f) can be deconvoluted into two peaks at 398.5 and 400.3 eV with the atomic concentrations of 1.92% and 1.85%, which correspond to the pyridinic and highly coordinated quaternary pyrrolic N species respectively. 78 However, these pyridinic and pyrrolic N peaks for samples TiCuC700 and TiCuC800 are slightly shied to 398.3 and 400.6 eV respectively. The change in the relative intensities of the pyridinic and pyrrolic N peaks further conrms the formation of defects in the porous carbon matrix at a higher pyrolysis temperature.…”

“…The diameter of the arc or semicircle in the high frequency region of the Nyquist diagram represents the interfacial resistance between the electrode and the electrolyte. 78,79 The Nyquist impedance spectra (Fig. 5d) show that the R ct values of samples TiCuC550, TiCuC700 and TiCuC800 are 277, 64 and 187 U respectively.…”

Recent Advances in Layered Tungsten Disulfide as Electrocatalyst for Water Splitting

“…These factors lead to the excellent electrocatalytic performance of PNEWS 2 (Figure 14e-f), low overpotential (59 mV), small Tafel slope (35 mV dec À 1 ) and long-term stability. Furthermore, Huang et al [135] synthesized N and S co-doped bifunctional electrocatalyst by a one-pot method, which showed significantly improved for HER and OER performance. The study found that the presence of N changed the electronic structure of adjacent carbon atoms, and the codoping of N and S resulted in asymmetric spins and changes in bulk density.…”

POM@MOF Hybrids: Synthesis and Applications

“…Keggin-based POMs possess a relatively larger particle size up to 1.3~1.4 nm in comparison to the cavities of ZIF-8, but can fit perfectly in their anionic form (1 nm diameter of PW 12 ) [33]. Therefore, the bottle-around-the-ship method is an ideal approach for confining POMs inside ZIF-8 or ZIF-67 [44]. For instance, Malka et al reported a POM encapsulated in ZIF-8 for its use as an esterification catalyst.…”