<p><span style="font-size:22px;">The basic unit of a fuel cell consists of a set of membrane electrode assemblies and corresponding unipolar or bipolar plates.</span></p> <p><img src="https://omo-oss-image.thefastimg.com/portal-saas/new2021111517435692249/cms/image/image-20221214143650-2.jpeg" style="width: 600px; height: 600px; max-width: none;" /></p>

<h1 style="text-align: center;"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">The proton exchange membrane is a selectively permeable membrane, which has the dual function of proton channel and hindering the direct reaction of reactants. Accordingly, we should consider the following points when choosing a proton exchange membrane:</font></span></span></span></span></span></span></span></span></span></span></span></h1> <p style="text-align:justify"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">①High conductivity of protons to reduce ohmic resistance and improve battery output power;</font></span></span></span></span></span></span></span></span></span></span></span></p> <p style="text-align:justify"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">② When DMFC works, keep the membrane structure and resin composition unchanged, so as to maintain excellent chemical and electrochemical stability, and maintain the reliability and durability of the battery;</font></span></span></span></span></span></span></span></span></span></span></span></p> <p style="text-align:justify"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">③The membrane should have low reactant permeability coefficients under both dry and wet conditions to reduce the mixing potential and improve the cell Faradaic efficiency;</font></span></span></span></span></span></span></span></span></span></span></span></p> <p style="text-align:justify"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">④The surface of the membrane before the decomposition of the membrane resin has a certain viscosity to ensure the good combination of the catalytic layer and the membrane and reduce the contact resistance; </font></span></span></span></span></span></span></span></span></span></span></span></p> <p style="text-align:justify"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">⑤The membrane has a certain mechanical strength in the dry and wet state to ensure the preparation and assembly of the membrane electrode assembly; </font></span></span></span></span></span></span></span></span></span></span></span></p> <p style="text-align:justify"><span style="font-size:10.5pt"><span style="text-autospace:ideograph-numeric"><span style="line-height:150%"><span style="font-family:Calibri"><span style="font-size:11.0000pt"><span style="background:#ffffff"><span style="font-family:'Microsoft YaHei UI'"><span style="line-height:150%"><span style="color:#222222"><span style="letter-spacing:0.4000pt"><span style="font-style:normal"><font face="Microsoft YaHei UI">⑥Considering industrialization conditions, membrane material selection should be easy to obtain and low cost.</font></span></span></span></span></span></span></span></span></span></span></span></p>