Nanotube/porous Ti/W/Ni oxide thin film catalytic electrode in-site loaded with platinum/palladium nanoparticles and preparation method therefor

Abstract

The invention relates to a tubular (porous) Ti / W / Ni oxide thin film catalytic electrode in-site loaded with platinum (palladium) nanoparticles and a preparation method therefor, and belongs to the technical field of energy materials and electro-catalysis, for solving technical problems by providing the nano-tubular (porous) Ti / W / Ni oxide thin film catalytic electrode in-site loaded with the platinum (palladium) nanoparticles, having a simple preparation process, high possibility of large-scale industrial production without using noble metal salts and strong reducing agents in the production process, and low environmental harm, and the preparation method therefor; for fulfilling the purpose, the invention adopts the technical scheme as follows: depositing a Ti / W / Ni-Pt / Pd alloy thin film into a titanium sheet, a tungsten sheet, a nickel titanium alloy sheet or the surface of a conductive glass, then taking the metal sheet or the conductive glass deposited with the Ti / W / Ni-Pt / Pd alloy thin film as the positive electrode, and taking a graphite rod / sheet or a platinum filament / sheet as the negative electrode for performing an anodic oxidation treatment to obtain the nanotube / porous Ti / W / Ni oxide thin film catalytic electrode in-site loaded with the platinum / palladium nanoparticles, wherein the metal Pt / Pd in the electrode is in-site embedded in the nanotube / porous wall of the nanotube / porous Ti / W / Ni oxide and exists in the form of the metal-state nanoparticles.

Description

technical field [0001] The invention relates to a nanotube (pore)-shaped Ti / W / Ni oxide in-situ supported platinum (palladium) nanoparticle film catalytic electrode and a preparation method thereof, which can be used for the electrocatalytic oxidation reaction of formic acid, methanol, ethanol and other liquid fuels. The invention belongs to the technical field of energy materials and electrocatalysis. Background technique [0002] Direct alcohol and formic acid fuel cells have the advantages of high efficiency, no pollution, no noise, wide application range, continuous operation, etc., and have broad application prospects in mobile device power supplies. The catalyst layer that directly and efficiently converts the chemical energy of methanol, ethanol, formic acid and other fuels into electrical energy is the core working part of the fuel cell. Fuel molecules undergo oxidation-reduction reactions on the active sites on the catalyst surface, and then generate electrons for ex...

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Problems solved by technology

Due to its high specific surface area and excellent chemical stability, nanotube-shaped titanium oxide has also been reported as an excellent carrier material for platinum group metal catalysts. However, at present, titanium oxide nanotubes are first prepared and then used as a carrier. On it, chemical reduction or microwave-assisted reduction method is used to chemically react the corresponding noble metal salt with the reducing agent, so that the formed noble metal nanoparticles are attached to the surface of the nanotube; due to the small diameter of the nanotube, it is generally in the range of tens to tens of Nano, so that the noble metal nanoparticles obtained by reduction are mostly distributed near the nanotube mouth and surface, and the distribution inside the tube cavity is very small. This kind of composite catalytic electrode obtained by chemical reduction of noble metal salt on the surface of titanium oxide tube greatly reduces The utilization rate of the large-area nanotube wall, and the binding force between the noble metal nanoparticles and the titanium oxide carrier is weak, and the two are easy to separate, resulting in instability and activity decline during the working process

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