Synthesis of sulfonated covalent organic framework modified chitosan electrolyte for efficient proton exchange
Exploration on the proton exchange electrolytes with cost-effective and high-performance is crit-ical to the development of energy conversion and storage field.The sulfonated covalent organic framework(TPBD-SO3H)was introduced into the chitosan(CS)matrix to fabricate a series of CS/TPBD-SO3H composite membranes,followed by analysis of their structures and properties.The results indicate that a cross-linking interaction between TPBD-SO3H and CS offers an enhanced thermal stability and optimized mechanical properties of the composite membranes.The tensile strength reached a maximum value of 80.2 MPa,exhibiting a 201%of improvement compared to the CS membrane.Simultaneously,the cross-linking interaction also brings a reduction in the swelling rate of the composite membranes,with a de-crease of approximately～40%compared to the CS membrane.More importantly,the porous structure of TPBD-SO3H,along with its abundant sulfonic acid groups,plays a crucial role in the efficient proton transportation.The composite membrane exhibiting a proton conductivity of up to 24.7 mS/cm under con-ditions of 80℃and 95%RH,which is twice that of the CS membrane.
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