Abstract Direct electrochemical production of hydrogen peroxide (H 2 O ) through two‐electron oxygen electrochemistry, for example, the reduction in fuel cells or water oxidation electrolyzers, could provide an attractive alternative to locally produce this chemical on demand. The efficiency these processes depends greatly availability cost‐effective catalysts with high selectivity, activity, and stability. In recent years, various novel nanostructured materials have been reported...

Subnanometer-sized copper nanoclusters were prepared by a one-pot procedure based on wet chemical reduction. The structural characteristics of the 2-mercapto-5-n-propylpyrimidine-protected nanoclusters, Cun (n ≤ 8), determined mass spectrometry. Cu displayed apparent luminescence, with dual emissions at 425 and 593 nm, quantum yields 3.5 0.9%, respectively, high electrocatalytic activity in electoreduction oxygen.

It is commonly accepted that it almost not possible to realize the large-scale practical application of fuel cells if expensive noble metal-based electrocatalysts for oxygen reduction reactions (ORR) cannot be replaced by other low-cost, efficient, and stable ones. Herein, our studies demonstrate iron phthalocyanine (FePc) supported on chemically reduced graphene through π–π interaction can act as a metal-free electrocatalyst with comparable activity, long-term operation stability, better...

The design and synthesis of highly active oxygen reduction reaction (ORR) catalysts with strong durability at low cost is extremely desirable but still remains a significant challenge. Here we develop an efficient strategy that utilizes organopalladium(I) complexes containing palladium-palladium bonds as precursors for the strongly coupled Pd tetrahedron-tungsten oxide nanosheet hybrids (Pd/W18O49) to improve electrocatalytic activity stability nanocrystals. hybrid materials are synthesized...

Fluorescent carbon dots prepared by a heat treatment of ethylene glycol solution can act as fluorescence turn-on probes for sensitive and selective detection Ag⁺ ions.

Abstract Due to the high costs, slow reaction kinetics, and methanol poisoning of platinum‐based cathode catalysts, designing exploring non‐Pt or low‐Pt electrocatalysts with a low cost, catalytic performance, methanol‐tolerance are crucial for commercialization fuel cells. Here, facile method fabricate system PdAg nanorings supported by graphene nanosheets is demonstrated; fabrication based on galvanic displacement between pre‐synthesized Ag nanoparticles palladium ions. X‐ray diffraction...

Graphene-supported PtPd alloy nanocubes (PtPd/RGO) were synthesized via a facile and versatile one-pot hydrothermal synthetic strategy, which proved to be universal technique for preparing other graphene-supported nanocrystals. In acidic electrolyte, the PtPd/RGO composites exhibited much enhanced electrocatalytic activity toward methanol oxidation compared unsupported with similar size shape, commercial Pt/C catalyst. More interestingly, we found that CO stripping is an efficient method...

Single-atom catalysts with well-defined atomic structures and precisely regulated coordination environments have been recognized as potential substitutes for natural metalloenzymes. Inspired by the metal structure of enzymes, we show here that oxidase-like activity single-atom Co greatly depends on their local N around catalytic sites. We synthesized a series different nitrogen numbers (Co–Nx(C), x = 2, 3, 4) demonstrated could be effectively tailored fine-tuning coordination. Among studied...

Distinguished by the coupled catalysis-facilitated high turnover and admirable specificity, enzyme cascades have sparked tremendous attention in bioanalysis. However, three-enzyme cascade-based versatile platforms rarely been explored without resorting to tedious immobilization procedures. Herein, we demonstrated that formamide-converted transition metal–nitrogen–carbon (f-MNC, M = Fe, Cu, Mn, Co, Zn) with a loading of atomically dispersed active sites possesses intrinsic peroxidase-mimetic...

Although various oxidase mimetic or peroxidase (POD) nanozymes have been extensively studied, their poor substrate selectivity significantly inhibits practical applications. Nanozymes with specific biomolecules as substrates, especially ascorbic acid (AAO) (AA) a substrate, scarcely studied. Herein, inspired by the multi-Cu atom sites and redox electron transfer pathway of Cu2+/Cu+ in natural AAO, atomically dispersed Cu immobilized on N-doped porous carbon (Cu-N/C) are artificially designed...

Abstract Membrane‐based reverse electrodialysis is globally recognized as a promising technology for harnessing osmotic energy. However, its practical application greatly restricted by the poor anti‐fouling ability of existing membrane materials. Inspired structural and functional models natural cytochrome c oxidases (C O), first use atomically precise homonuclear diatomic iron composites high‐performance energy conversion membranes with excellent demonstrated. Through rational tuning atomic...

Bimetallic alloy PdAg nanowires were synthesized by a facile one-step wet chemical strategy. The unique nanostructure with large surface area and active (111) planes make them promising electrocatalysts for direct-liquid fuel cells. electrochemical studies indicated that the exhibit enhanced electrocatalytic activity toward formic acid oxidation larger current density, higher tolerance to CO poisoning, more negative onset potential in comparison commercial Pd/C catalysts. At same potentials,...

A simple and cost-effective fluorescence immunoassay for the sensitive quantitation of disease biomarker α-fetoprotein (AFP) has been developed based on phosphate-triggered turn-on detection alkaline phosphatase (ALP), with reversible binding between calcein Ce3+ as a signaling element. In this immunoassay, fluorescent is readily quenched by via coordination process. The ALP-catalyzed hydrolysis p-nitrophenyl phosphate leads to formation p-nitrophenol inorganic orthophosphate, newly formed...

Nanoneedle-covered palladium−silver nanotubes were synthesized through a galvanic displacement reaction with Ag nanorods at 100 °C (PdAg-100) and room temperature (PdAg-25). Transmission scanning electron microscopic measurements displayed that the PdAg exhibit hollow structure nanoneedle-covered surface, providing perfect large surface area for catalytic reactions. The formed more uniform morphology than those obtained temperature. high-resolution TEM, energy-dispersive X-ray analysis,...

Abstract The search for an inexpensive bifunctional electrocatalyst overall water splitting has attracted considerable research interest during the past years. Herein, self‐supported hierarchical electrodes comprising nickel foam (NF) and porous molybdenum phosphide (MoP) nanoflakes are fabricated by first growing MoO 2 on Ni then further phosphorization treatment. Remarkably, serving as both anode cathode catalysts in a two‐electrode alkaline water‐electrolysis system, designed only require...

PtPd concave nanocubes could be tailored by graphene nanosheets and they exhibit enhanced electrocatalytic performance in methanol oxidation.