Directional porous monatomic carbon membrane electrode and preparation method and application thereof

Abstract

The invention discloses a directional porous monatomic carbon membrane electrode and a preparation method and application thereof. The preparation method comprises the steps of (1) dissolving oxidized multi-walled carbon nanotubes and cobalt salt in a solvent to obtain a precursor solution; (2) carrying out hydrothermal self-assembly on the precursor solution to obtain hydrogel; (3) cutting the hydrogel into a membrane, and then performing one-way freezing to obtain an oriented porous hydrogel membrane; (4) freeze-drying the oriented porous hydrogel membrane to obtain an oriented porous aerogel membrane; and (5) carbonizing the oriented porous aerogel membrane to obtain the Co-N-C modified oriented porous monatomic carbon membrane electrode. The oriented porous monatomic carbon membrane electrode has high activity and high stability, can produce hydrogen under the current density of more than 1000mAcm <-2 >, and realizes high-current and high-stability hydrogen production.

Description

technical field [0001] The invention relates to the technical field of oriented porous carbon film electrodes, in particular to an oriented porous single-atom carbon film electrode and its preparation method and application. Background technique [0002] Hydrogen is a clean and renewable energy carrier, and among existing hydrogen production methods, electrochemical reduction of water to hydrogen (HER) has the advantages of cleanliness, sustainability, and high purity of hydrogen production. The efficiency of HER hydrogen production depends on high-performance electrocatalysts, and Pt catalyst has the highest activity, but its high cost and low abundance limit its large-scale application. Therefore, it is imperative to develop elements with high abundance and low price as alternative catalysts. [0003] Single-atom catalysts (SACs) are catalysts in which the active sites are dispersed in the form of a single metal on a specific support, which has the combined advantages of ...

AI Technical Summary

Problems solved by technology

At high current densities, the rate of hydrogen production is high, the mass transfer rate of reactants and gas products in the electrolyte is increasingly limited, and the hydrogen produced on the electrode surface 2 The bubbles are not easy to fall off and seriously block the contact between the electrode and the electrolyte, thereby hindering the reaction

and the resulting H 2 Bubbles are easy to gather into large bubbles and adhere to the electrode. When the large bubbles fall off, the strong adhesion may also cause the electrode material to fall off

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