Preparation method of nitrogen-phosphorus co-doped carbon nanotube coated ferrocobalt bimetallic alloy in-situ electrode

Abstract

The invention discloses an in-situ composite electrode of a nitrogen-phosphorus co-doped carbon nanotube coated ferrocobalt bimetallic alloy catalyst and preparation method thereof, and application ofin-situ composite electrode. The preparation method comprises the following steps of: preparing an in-situ flaky MOF precursor on a carbon paper substrate; dipping the carbon paper on which the MOF precursor grows into a ferrous sulfate solution, and obtaining iron-containing MOF in the cation exchange process of the aqueous solution; after drying, putting the iron-containing MOF into a reactionkettle containing a phosphorus source, and performing heating to achieve gas-phase phosphorus doping; and in Ar gas flow or N2 gas flow, discharging urea for annealing and in-situ preparation of the carbon nanotubes. The product obtained by the technical scheme provided by the invention constructs a variety of high electrocatalytic active sites, and includes metal particles coated at the top end of a carbon nanotube and nitrogen-phosphorus co-doped carbon active sites. The in-situ composite electrode provided by the invention has the excellent and stable three-function catalytic activity of HER, OER and ORR.

Description

technical field [0001] The invention relates to an in-situ electrode and its preparation, in particular to a preparation method for an in-situ electrode of a cobalt-iron bimetallic alloy coated with nitrogen and phosphorus co-doped carbon nanotubes, and belongs to the field of energy storage and conversion materials and devices. Background technique [0002] The ever-increasing demands of energy consumption have posed major challenges to society's ability to maintain energy supplies. The development of efficient and stable energy storage and conversion devices (e.g., water electrolysis, metal-air batteries, fuel cells) has been a research topic in the field of electrocatalysis. Therefore, it is of great significance to find cathode materials with low overpotential, low energy consumption, and high-efficiency hydrogen production (HER) performance. The inefficiency of simultaneous oxygen evolution reaction (OER) and redox reaction (ORR) catalysts is a key obstacle in the deve...

AI Technical Summary

Problems solved by technology

The inefficiency of simultaneous oxygen evolution reaction (OER) and redox reaction (ORR) catalysts is a key obstacle to the development of viable rechargeable Zn-air batteries

At present, platinum, ruthenium and their compounds are the most ideal catalysts, which have low overpotential and high current density during charge and discharge, however these noble metal catalysts are inevitably damaged in the alternating redox state of OER and ORR, So there is a problem of poor stability

Coupled with its high price and scarcity of resources, widespread application is hindered

Due to the low catalytic activity of the cathode catalyst, the existing alkaline zinc-air batteries cannot meet the requirements of high-energy electronic products, and the efficiency of the battery gradually decreases during the charging and discharging process.

Moreover, the effective capacity of zinc-air batteries is very low, and the high-current application market is occupied by rechargeable batteries such as lithium-ion batteries.

Images