Nanometer particulate matter modified compound proton exchange membrane and preparation method thereof

Abstract

The invention discloses a nanometer particulate matter modified compound proton exchange membrane and a preparation method thereof. The membrane is compounded by 0.5 to 50 mass percent of surface modified nanometer particles and the balance of proton exchange resin. The preparation method comprises the following steps of: performing surface chemical modification on one of nanometer particles TiO2, SiO2 and TiO2-SiO2 with the particle diameter of 10 to 1,000nm by using a silane coupling agent RSiX3; then coupling with one of naphthalene acid derivatives, benzene sulfonic acid derivatives, NH2CH2(XCH2)mNH2 and ethylenimine; adding the modified nanometer particles into a resin solution to cast a membrane; sequentially soaking in an H2SO4 solution (or H3PO4 solution) and deionized water for 2 hours; and taking out and wiping to obtain the compound membrane.

Description

technical field [0001] The invention belongs to the field of preparation of proton exchange membranes for direct methanol fuel cells, in particular to the preparation of surface-modified nanoparticles and composite membranes. Background technique [0002] Direct methanol fuel cell is a device that uses methanol as fuel to directly convert chemical energy into low-voltage direct current through electrochemical reaction. It has the characteristics of high efficiency, environmental friendliness, quietness and high feasibility. Proton exchange membrane is the core component of direct methanol fuel cell (DMFC). Membranes are represented by perfluorosulfonic acid series membranes, but Membrane is expensive, methanol permeability is high, and the performance is significantly reduced in high temperature and low humidity environment, which has become one of the bottlenecks restricting the development of DMFC. based on The modification or compounding of the membrane is an import...

AI Technical Summary

Problems solved by technology

Proton exchange membrane is the core component of direct methanol fuel cell (DMFC). Membranes are represented by perfluorosulfonic acid series membranes, but Membrane is expensive, methanol permeability is high, and the performance is significantly reduced in high temperature and low humidity environment, which has become one of the bottlenecks restricting the development of DMFC

based on The modification or compounding of the membrane is an important way to overcome the corresponding shortcomings, such as in order to improve The water retention and alcohol resistance properties of the film can be improved to Add hydrophilic inorganic particles (such as TiO 2 , SiO 2 , solid acid, etc.) to prepare organic-inorganic composite membranes (E.I.Santiago et al.Electrochimica Acta, 2009, 54:4111-4117), but due to the poor compatibility of organic-inorganic particles and the number of sulfonate groups per unit area of ​​the membrane decreased, resulting in varying degrees of decrease in the flexibility and proton conductivity of the composite membrane

In order to improve the compatibility between inorganic particles and organic substances, there are also chemical modifications on the surface of inorganic particles with organic functional groups (such as -SO 3 After H) (Y.-H.Su et al.Journal of Power Sources, 2009, 194(1): 206-213), the corresponding composite membrane was prepared by blending with the proton exchange resin solution, but the introduced sulfonic acid group The reduction in proton conductivity cannot be avoided, and the performance of the proton exchange membrane has not been significantly improved