Electrocatalyst materials for fuel cells based on the polyoxometalates—K7 or H7[(P2W17O61)FeIII(H2O)] and Na12 or H12[(P2W15O56)2FeIII4(H2O)2]

Recent Progress on Functionalized Nanoporous Heteropoly Acids: From Synthesis to Applications

Functionalized nanoporous heteropoly acids (HPAs) have garnered significant attention in recent years due to their enhanced surface area and porosity, as well as their potential for low-cost regeneration compared to bulk materials. This review aims to provide an overview of the recent advancements in the synthesis and applications of functionalized HPAs. We begin by introducing the fundamental properties of HPAs and their unique structure, followed by a comprehensive overview of the various approaches employed for the synthesis of functionalized HPAs, including salts, anchoring onto supports, and implementing mesoporous silica sieves. The potential applications of functionalized HPAs in various fields are also discussed, highlighting their boosted performance in a wide range of applications. Finally, we address the current challenges and present future prospects in the development of functionalized HPAs, particularly in the context of mesoporous HPAs. This review aims to provide a comprehensive summary of the recent progress in the field, highlighting the significant advancements made in the synthesis and applications of functionalized HPAs.

Ionic self-assembly of metalloporphyrin/heteropolyacid on multi-wall carbon nanotubes with enhanced electrocatalytic activity toward oxygen reduction reaction

We report the synthesis of a series of hybrid electrocatalysts toward oxygen reduction reaction (ORR) by ionic self-assembly of positively charged Fe(III) meso-tetra([Formula: see text]-methyl-4-pyridyl)porphyrin (FeP) with negatively charged H3PMo[Formula: see text]O[Formula: see text] (PMo[Formula: see text] in ethanol solution under ambient conditions in the presence of suspended multi-wall carbon nanotubes (MWCNTs). Self-assembled FeP/PMo[Formula: see text] was well-dispersed on MWCNTs with a tunable loading from 26.3% to 55.6%. Interestingly, the hybrid electrocatalysts demonstrated a much higher ORR activity than individual PMo[Formula: see text] and FeP in acidic media. We speculate that this activity enhancement might originate from a possible synergy between PMo[Formula: see text] and FeP. This study may be extended to the design and synthesis of other types of hybrid electrocatalysts for applications in electrochemical energy conversion, storage and sensing.

Mild, efficient, and environmentally friendly synthesis of symmetrical N,N′-alkylidenebisamides under solvent-free conditions catalyzed by H7[(P2W17O61)FeIII(H2O)]

H₇[(P₂W₁₇O₆₁)Fe^III(H₂O)] is introduced as an effective catalyst for the one-pot synthesis ofN,N′-alkylidenebisamides. The catalyst could be easily separated without noticeable reduction in activity.

A cobalt coordination compound with indole acetic acid for fabrication of a high performance cathode catalyst in fuel cells

Construction of coupling site with electrophilic and nucleophilic centers is the key to enhance ORR in acidic electrolyte.