Microporous nickel phosphonate derived heteroatom doped nickel oxide and nickel phosphide: Efficient electrocatalysts for oxygen evolution reaction

Systematic Engineering on Ni‐Based Nanocatalysts Effectively Promote Hydrogen Evolution Reaction

“…Most synthesis methods are multi-step, take long time, low yield, contain solvents, and are not suitable for scaled production. [27][28][29][30][31][32][33][34] On the other hand, many materials contain surfacants and the size of them is relatively large (>50 nm), [33][34][35][36][37][38] which mask a large number of active sites so that catalysts cannot be utilized fully. Therefore, it is particularly important to synthesize surfactant-free ultra-small (<5 nm) nanocatalysts with excellent performance and largescale production.In this work, a series of noble metal doped ultra-small size (4 nm) M-Ni/NiO nanoparticals supported on CNT (M = Ir, Ru, Pd, CNT is carboxylated multi-walled carbon nanotube) were prepared by solvent-free microwave method that is simple, fast, high yield (82.7%), large-scale (>1 g), and no surfactants for the first time.…”

“…Most synthesis methods are multi-step, take long time, low yield, contain solvents, and are not suitable for scaled production. [27][28][29][30][31][32][33][34] On the other hand, many materials contain surfacants and the size of them is relatively large (>50 nm), [33][34][35][36][37][38] which mask a large number of active sites so that catalysts cannot be utilized fully. Therefore, it is particularly important to synthesize surfactant-free ultra-small (<5 nm) nanocatalysts with excellent performance and largescale production.…”

Porous organic–inorganic hybrid materials for catalysis, energy and environmental applications

“…Kimura employed methylene diphosphonic acid as an organophosphorous precursor for the synthesis of a mesoporous aluminum organophosphonate using octadecyltrimethylammonium chloride as the template under hydrothermal conditions. 98 However, this hybrid mesoporous material lost its periodicity considerably upon removal of the template molecules during the lowtemperature calcination process. The antagonistic relationship between porosity and crystallinity for metal organophosphonate hybrid materials was discussed by Shimizu and co-workers, where they designed a tetrahedral organophosphonate ligand, 1,3,5,7-tetrakis(4-phosphonatophenyl)adamantane (H 8 L), containing a Cu-organophosphonate having a diamondoid net topology.…”

“…Recently, in 2021, Bhanja et al hydrothermally synthesized a template-free microporous hybrid nickel phosphonate (NiPPA). 98 In a typical synthesis, a nickel nitrate solution was poured into diethylene-triaminepentakis(methylphosphonic acid) solution, maintaining the pH to 6 using ammonia solution, followed by thermal treatment at 150 1C for 48 h. A green-coloured product was obtained by centrifugation, which was further washed with water and absolute ethanol to remove the unreacted precursors. Microporosity was achieved in the framework given that each phosphonate group coordinating with Ni(II) ions is separated from each other by a short distance.…”

Highly Stable Trimetallic (Co, Ni, and Fe) Zeolite Imidazolate Framework Microfibers: An Excellent Electrocatalyst for Water Oxidation

“…On the other hand, Bhanja et al synthesized N, P- co -doped nickel oxide via the pyrolysis process and subjected it to the OER process in alkaline medium. The observed overpotential was 332 mV at 10 mA cm –2 current density with a less Tafel slope value of 65.6 mV dec –1 . Further, Yan et al reported the superior electrocatalytic OER activity observed via amorphous iron oxide nanosheets as a catalytic material.…”