Carbon-based anchored non-noble metal monatomic catalyst as well as preparation method and application thereof

Abstract

The invention discloses a carbon-based anchored non-noble metal monatomic catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: adding a nitrogen source, a surfactant and a sulfur source into deionized water, heating and stirring to form a uniform turbid liquid, wherein the nitrogen source is melamine or urea, and the surfactantis P123, F108, F127 or polyethylene glycol 2000,the sulfur source is N-acetyl-L-cysteine, L-cysteine, sulfur powder, sodium thiosulfate, or sodium persulfate; drying the turbid liquid; and heating to550-1000 DEG C under a protective gas, carbonizing for 60-360 minutes, and naturally cooling to room temperature to obtain a carbon defect porous nanosheet; adding the carbon defect porous nanosheetand chromium chloride into ethanol, stirring at normal temperature, and centrifugally drying; and corroding the obtained product with a diluted hydrochloric acid solution, and centrifugally drying toobtain the product. The product disclosed by the invention provides a powerful active site for ORR.

Description

technical field [0001] The invention belongs to the field of inorganic nanomaterial chemistry and electrochemistry, and specifically relates to a carbon-based anchored non-noble metal single-atom catalyst, its preparation method and application. Background technique [0002] Nowadays, the rapidly developing "Internet of Things" has an increasing demand for emerging high-tech electronic technologies such as electric vehicles, advanced batteries with high energy density, robustness, flexibility and environmental friendliness, electrochemical energy conversion and storage The research and development of materials, devices and devices is the main research direction of many researchers. Zinc-air batteries exhibit the advantages of high energy density, low equilibrium potential, stable discharge voltage, and long service life, making them a promising electrochemical energy storage technology. The slow cathodic ORR catalytic process and the expensive and scarce reserves of noble m...

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Problems solved by technology

[0004] Currently, the synthesis of atomically dispersed catalysts faces two major challenges: (1) the aim is to incorporate ultra-low concentrations (<0.5 wt%) of atomic metals (aMs) on the support surface due to aggregation avoidance and (2) most aMs synthesized Routes involve complex or harsh processing conditions (e.g., pyrolysis of metal-organic frameworks, arc discharge methods, and electrochemical activation), which limit the use of aM in a wide range of applications

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