A rare polyoxometalate cluster [NiW₁₂O₄₄]¹⁴⁻based solid as a pre-catalyst for efficient and long-term oxygen evolution

Abstract

Polyoxometalates (POMs) are an eminent class of metal oxide anionic clusters of early transition metals with huge structural diversity. Herein, a [NiW12O44]14- cluster based solid, (C5H7N2)6 [NiW12O44] has been reported...

The current state of transition metal-based electrocatalysts (oxides, alloys, POMs, and MOFs) for oxygen reduction, oxygen evolution, and hydrogen evolution reactions

“…It maintained a current density of 10 mA/ cm 2 for up to 96 h, indicating good stability and outperforming state-ofthe-art RuO 2 electrocatalyst. The observed performance was attributed to the in situ formation of WO x (x = 1,2) and NiO, Ni(OH) 2 , and NiOOH, which act as active phases in the electrocatalyst (Sood et al, 2022).…”

“…Imani et al designed a Mn-containing POM-based composite that was later deposited onto a rotating carbon paste electrode by two Different hetero-polyoxometalates belonging to the 1:12 series of POMs with various heteroatoms (adapted from Sood et al, 2022).…”

An hourglass-shaped nickel-based polyoxometalate crystalline material as a highly efficient bifunctional electrocatalyst for the oxygen evolution reaction and detection of H2O2

“…[19][20][21][22] In fact, controversy has arisen on the question of whether POMs are used as true electrocatalysts or only as pre-catalysts. [23][24][25][26][27][28][29][30][31] For OER electrocatalysts, the composition and structure of the catalyst are found to be unstable and the structure of the catalysts undergoes reconstruction to generate new phases that exhibit higher/lower catalytic activity, which suggests that such kinds of catalysts actually act with pre-catalytic effects. In 2022, Parul Sood and co-workers reported a [NiW 12 O 44 ] 14− cluster-based POM (PS-78) and demonstrated that in situ-generated NiO and WO x were active substances for the OER process.…”

“…In 2022, Parul Sood and co-workers reported a [NiW 12 O 44 ] 14− cluster-based POM (PS-78) and demonstrated that in situ-generated NiO and WO x were active substances for the OER process. 31 At present, transition metals such as iron, manganese, and nickel have also emerged as viable alternatives to established OER catalysts. Their catalytic activities are in the order Ni > Co > Fe > Mn, and based on nickel being abundant in the Earth's crust and having excellent electrochemical properties, [32][33][34][35] more attention should be paid to OER research of nickel-based POMs.…”

Polyoxometalate-Derived Cu-MoO2 Nanosheets as Electrocatalysts for Enhanced Acidic Water Oxidation

“…Polyoxometalates (POMs), which are a distinguishing class of nanosized clusters, have recently been proposed as viable water oxidation catalysts (WOCs) because of their strong redox activity, low cost, and high durability. − They can also be used as precursors for WOCs for synthesizing nanomaterials, owing to their huge structural diversity. − The use of nanomaterials in catalysis has increased significantly in recent years due to higher surface area and more exposed active sites …”