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在磺化度(DS)为55.1%的磺化聚醚醚酮(SPEEK)中掺杂功能化二氧化硅(吸湿性SiO2溶胶及带有磺酸基团的二氧化硅(SiOx-S)粒子)制备SPEEK/SiO2和SPEEK/SiOx-S复合质子交换膜.SiO2和SiOx-S的掺杂能有效提高复合膜的抗溶胀、阻醇性能及高温低湿情况下的电导率.纯SPEEK膜在80℃溶胀为52.6%,而SiO2和SiOx-S掺杂量为15%的复合膜在此温度下分别仅有26.2%和27.3%的溶胀.在室温至80℃范围内,SPEEK/SiO2(20 wt%)和SPEEK/SiOx-S(20 wt%)复合膜的甲醇透过系数比Nafion115膜小近2个数量级.在120℃、相对湿度(RH)为40%情况下,SPEEK纯膜的电导率仅为2.6×10-4S.cm-1,SPEEK/SiO2(20 wt%)复合膜约为2.0×10-3S.cm-1,而SPEEK/SiOx-S(20 wt%)复合膜高达1.0×10-2S.cm-1,与Nafion115相当.SPEEK/SiO2(20 wt%)和SPEEK/SiOx-S(20 wt%)2种复合膜的尺寸稳定性较高,膜电极无催化剂与膜分离现象,其DMFCs单电池性能好于SPEEK膜.
Sulfonated polyetheretherketone (SPEEK) with a degree of sulfonation (DS) of 55.1% was doped with functionalized silica (hygroscopic SiO 2 sol and sulfonic acid group-containing silica (SiOx-S) particles ) SPEEK / SiOx-S composite proton exchange membrane was prepared.The doping of SiO 2 and SiOx-S can effectively improve the anti-swelling and alcohol-resistance properties of the composite membrane, ℃, while the composite films with SiO 2 and SiOx-S doping amount of 15% had only 26.2% and 27.3% swelling at room temperature respectively.The SPEEK / SiO 2 (20 wt% %) And SPEEK / SiOx-S (20 wt%) composite membrane is 2 orders of magnitude smaller than that of Nafion115.When the relative humidity (RH) is 40% at 120 ℃, The conductivity of the composite membrane was only about 2.0 × 10-3S.cm-1, while the SPEEK / SiOx-S (20 wt%) composite membrane was as high as 2.6 × 10-4S · cm- 1.0 × 10-2S · cm-1, which is equivalent to that of Nafion 115. The composite films with SPEEK / SiO2 (20 wt%) and SPEEK / SiOx-S Separated from the membrane, DMFCs have better cell performance than SPEEK membranes.