Block Copolymer Multilayered Membrane for Neutral Fuel Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solid polymer membranes for fuel cells are not suitable for neutral solvent atmospheres due to their strong acidity, and there is a lack of membranes that can incorporate nanoparticles while preventing nanoparticle movement during current flow.
Innovation Solution
A block copolymer with hydrophilic and hydrophobic segments, including catechol groups, is used to create a multilayered structure that can reduce inorganic ions to form nanoparticles, producing a solid polymer membrane suitable for neutral solvent atmospheres and preventing nanoparticle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Nafion is used as a solid polymer membrane, then proton conductivity is improved, but the membrane cannot be used in a neutral solvent atmosphere due to strong acidity
Solution Approach 1:
The patent uses a composite structure combining organic polymer matrix with metal ions (Fe, Co, Ru, Zn, or Ni) coordinated to bis(terpyridyl)benzene ligands. This composite material integrates the proton conduction capability of the polymer with the neutral pH stability of the metal complex, resolving the contradiction between proton conductivity and neutral solvent compatibility.
Solution Approach 2:
The patent changes the chemical parameters of the polymer membrane by incorporating metal ions with specific coordination chemistry properties. The metal-bis(terpyridyl)benzene complex has a pKa that allows it to maintain stability in neutral environments while still enabling proton transport, thus adjusting the membrane's chemical characteristics to suit neutral solvent atmospheres.
2Reliability
If nanoparticles are contained in the solid polymer membrane, then water retention is improved, but nanoparticles move when current flows through the membrane
Solution Approach 1:
The patent introduces an intermediary mechanism where metal ions are coordinated to bis(terpyridyl)benzene ligands within the polymer matrix. This intermediary structure provides anchoring sites that prevent nanoparticle movement while maintaining water retention, solving the contradiction between water retention and positional stability under current flow.
Solution Approach 2:
The patent creates local regions within the membrane where metal-bis(terpyridyl)benzene complexes are distributed to provide localized anchoring points. These local structures prevent nanoparticle migration while maintaining overall membrane water retention, addressing the stability issue without compromising the water retention property.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting membrane enables proton conduction and maintains nanoparticle stability within the fuel cell, enhancing performance and stability in neutral solvent conditions.
Implementation Method 1
the hydrophilic segment including the catechol group... the multilayered structure having a function of reducing inorganic ions to form inorganic nanoparticles
Implementation Method 2
a solid polymer membrane provided between the electrodes that conducts protons from the anode electrode to the cathode electrode
Data Source
AI summary
The problem addressed by the present invention is to provide a block copolymer that can be used in a neutral solvent atmosphere and can produce a solid polymer membrane including nanoparticles.The problem is solved by a block copolymer represented by formula (1) below.wherein in the formula, R1 represents a C1-20 linear, branched, or cyclic alkyl group, C6-20 aryl group, or C7-20 aralkyl group; R2 represents a group having a functional group having an acid dissociation constant pKa of from 0.5 to 7; R3, R4, and R5 each show H or a C1-20 linear, branched, or cyclic alkyl group; R6, R7, and R8 each represent a hydrogen, hydroxyl group, nitro group, carboxy group, or carbonyl group; X represents an amide or ester, but may not be included; Y represents an amide or ester, but may not be included; p represents an integer of 1-10, but may not be included; n represents an integer of 3-1000; m represents an integer of 3-1000; and t represents an integer of 3-1000, but n may not be included; the arrangement of n, m, and t is arbitrary, but n and m are adjacent when n is included.