Preparation method of leaf-based nitrogen-doped porous carbon, and application of leaf-based nitrogen-doped porous carbon in oxygen reduction electro-catalysis within full pH range

Abstract

The invention discloses a preparation method of leaf-based nitrogen-doped porous carbon, and application of the leaf-based nitrogen-doped porous carbon in oxygen reduction electro-catalysis in a full pH range. The preparation method comprises the following steps: cleaning, drying and grinding leaf-based biomass; weighing a certain amount of a biomass powder material, soaking the biomass powder material in an acetic acid-sodium acetate solution containing hemicellulase, standing for a period of time at a constant temperature, hydrolyzing, filtering, washing, drying, pre-carbonizing in an inert atmosphere, cooling to room temperature, grinding into powder, weighing the powder, a nitrogen source and an activating agent according to a mass ratio, performing high-energy vacuum mechanical ball milling, performing high-temperature carbonization on the ball-milled mixture in an inert atmosphere, performing acid pickling, filtering washing with water until filtrate is neutral, and drying to obtain the nitrogen-doped porous carbon material. Biomass is modified by utilizing an enzyme synergistic high-energy vacuum mechanical force ball milling method, and the prepared nitrogen-doped porous carbon material is large in specific surface area, obvious in hierarchical pore structure and rich in nitrogen content, and has excellent ORR electrocatalytic activity in a whole pH range (0-13).

Description

technical field [0001] The invention belongs to the field of inorganic nano-carbon materials and electrocatalysis, and relates to a nitrogen-doped porous carbon, in particular to a preparation method of leaf-based nitrogen-doped porous carbon and its application in oxygen reduction electrocatalysis in the full pH range. Background technique [0002] Energy is the material basis for human survival and development. In today's society, mankind's demand for energy is increasing day by day. Therefore, the development of new efficient, renewable and clean energy has become the focus of current research. Fuel cells are environmentally friendly and efficient. Unlike traditional non-renewable energy sources, fuel cells do not need to be burned during the material / energy cycle and do not produce toxic and harmful gases. It can directly convert the chemical energy of the anode fuel into electrical energy under relatively mild conditions. High conversion efficiency. [0003] Oxygen r...

AI Technical Summary

Problems solved by technology

Platinum-based (Pt), rhodium-based (Rh) and other noble metals have good electrocatalytic activity for ORR, but precious metals are scarce in reserves, expensive, and poor in stability, and are easily destroyed by trace amounts of CO and H during use. 2 S, etc. are poisoned and deactivated, which hinders the development and commercialization of fuel cell technology

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