Highly Crystalline Mesoporous Phosphotungstic Acid: A High‐Performance Electrode Material for Energy‐Storage Applications

Abstract

Heteropoly acids (HPAs) are unique materials with interesting properties, including high acidity and proton conductivity. However, their low specific surface area and high solubility in polar solvents make them unattractive for catalytic or energy applications. This obstacle can be overcome by creating nanoporosity within the HPA. We synthesized mesoporous phosphotungstic acid (mPTA) with a spherical morphology through the self‐assembly of phosphotungstic acid (PTA) with a polymeric surfactant as stabilized by KCl and hydrothermal treatment. The mPTA nanostructures had a surface area of 93 m2 g−1 and a pore size of 4 nm. Their high thermal stability (ca. 450 °C) and lack of solubility in ethylene carbonate/diethyl carbonate (EC/DEC) electrolyte are beneficial for lithium‐ion batteries (LIBs). Optimized mPTA showed a reversible capacity of 872 mAh g−1 at 0.1 A g−1 even after 100 cycles for LIBs, as attributed to a super‐reduced state of HPA and the storage of Li ions within the mesochannels of mPTA.

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

“…It was proposed that the addition of KCl during the synthesis helps to reduce the interference and facilitates the long‐range ordering. These materials could be applied as acid catalysts for various acid‐catalyzed organic transformation as these are found to be highly stable and acidic …”

Phosphotungstic acid‐Titania loaded polyaniline nanocomposite as efficient methanol electro‐oxidation catalyst in fuel cells

“…20,21 Numerous research studies have focused on the significant application of the HPAs as electrocatalyst for fuel cells. 8,[22][23][24] The molecular formula of PTA is H 3 PW 12 O 40 , and it is Keggin type structure contains phosphorus atom bounded by tungsten oxide clusters and four types of oxygen atom founded in Keggin structure. The PTA is a Bronsted super-acid and oxidation catalyst.…”

3-Bromopyridine-Heterogenized Phosphotungstic Acid for Efficient Trimerization of Biomass-Derived 5-Hydroxymethylfurfural with 2-Methylfuran to C21 Fuel Precursor

“…In particular, phosphotungstic acid (HPW, H 3 PW 12 O 40 ) has a tetrahedral PO 4 core in the center of the anion structure, surrounded by twelve WO 6 polyhedra via oxygen atoms to link each other, which exhibits excellent catalytic activity for upgrading biomassderived compounds into different valuable chemicals and biofuels [33,34]. However, it should be mentioned that HPW is extremely soluble into most polar solvents, difficult to separate, corrosive to reactors, and polluted to the environment [35][36][37][38][39][40][41][42][43][44][45][46][47][48]. Taking the above problems into consideration, it is highly desirable to heterogenize HPW using a high-efficiency method.…”