Borate-ion intercalated Ni Fe layered double hydroxide to simultaneously boost mass transport and charge transfer for catalysis of water oxidation

Fe‐Doped Ni3S2 Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

“…The electronic structure of Ni, S and Fe elements in Fe 13.7% -Ni 3 S 2 were monitored by XPS. The Ni 2p spectrum in Figure 4a exhibits the deconvoluted peaks at binding energies of 855.7 and 873.5 eV, which are corresponded to Ni 2p 3/2 and Ni 2p 1/2 of Ni 2 + in Ni 3 S 2 , [25,27,40] whereas the peaks at 861.6 and 879.4 eV are conformed to Ni 2 + satellite peaks. [25,27,41] The peaks at binding energies of 852.6 and 870.1 eV can be ascribed to metallic Ni 2p on account of Ni foam substrate.…”

Ultrathin Amorphous Nickel Doped Cobalt Phosphates with Highly Ordered Mesoporous Structures as Efficient Electrocatalyst for Oxygen Evolution Reaction

“…Mass transport is an important parameter to describe the transfer rate of electrocatalysts to the electrolyte. Faster mass transport leads to higher electrocatalysts utilization, which means better performance of the electrocatalysts for the same mass loading . Furthermore, a highly ordered porous structure such as mesopores can offer higher surface area, which means more active sites are exposed to electrolyte .…”

Layered and two dimensional metal oxides for electrochemical energy conversion

“…In this study, it was suggested that the O 2 mechanism of the borate intercalated LDH was enhanced compared to the bare LDH due to the borate ions acting as a proton accepting agent which increases the O-O bond formation during the OER. 111 Another recent study on the OER properties of an anodic borate doped Ni(OH) 2 has also indicated that the presence of borate enhances the proton accepting properties during the OER compared to a non-doped Ni(OH) 2 catalyst, Fig. 11(A and B).…”

“…For example, layered Ni 0.8 Fe 0.2 OH LDH prepared by a hydrothermal synthesis was subjected to anion exchange, using BO 3 3À ions, resulted in an increased in the interlayer spacing from 5.4 Å to 6.2 Å. 111 The anion exchange process introduced a boost in the LDH specific surface area from 150.9 m 2 g À1 to 170.9 m 2 g À1 which was determine by BET analysis. Additionally the OER properties of the layered Ni 0.8 Fe 0.2 OH LDH in 1 M KOH were clearly enhanced after anion exchange as the overpotential at 10 mA cm À2 and the Tafel slope values both improved.…”