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首页> 外文期刊>RSC Advances >Effect of pore-directing agents and silanol groups in mesoporous silica nanoparticles as Nafion fillers on the performance of DMFCs
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Effect of pore-directing agents and silanol groups in mesoporous silica nanoparticles as Nafion fillers on the performance of DMFCs

机译：中孔二氧化硅纳米粒子中孔径引导剂和硅烷醇基的影响为氮素填料对DMFC性能的影响

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Two kinds of nanoparticles of mesoporous silica, namely SBA-15n and MSN, were prepared using P123 and CTMABr as pore-directing agents, respectively, and loaded into Nafion? to form composite membranes by solvent casting method. The physico-chemical properties of these nanoparticles were examined with powder-XRD, N _(2) sorption, TGA, EA, SEM and ~(29) Si MAS NMR. The methanol permeability, proton conductivity, and cell performance of the resultant composite membranes were compared in terms of the amount of nanoparticles, whether the pore-directing agents were removed and the different kinds of nanoparticles of mesoporous silica. It was found that both pore-directing agents present inside the pores of nanoparticles could contribute to resisting methanol crossover to the cathode. However, only P123 inside SBA-15n could assist proton transfer, probably through the ether groups on the P123 co-polymer. The proton conductivity of the composite membrane containing extracted SBA-15n was lower than the membrane that contained P123. Nevertheless, the highest proton conductivity was obtained on the composite membranes filled with ethanol extracted MSN (Ex-MSN) particles. This is attributed to the larger amount of silanol groups present in Ex-MSN than in extracted SBA-15n. The optimal proton conductivity of 4.01 × 10 ~(?2) S cm ~(?1) was obtained on the composite membrane filled with 5% Ex-MSN, and the single cell assembled with this composite membrane gave a highest power density of 131 mW cm ~(?2) at 60 °C, which was about 2 times higher than the cell with recasting plain Nafion membrane and 36% higher than that with commercial Nafion? 117 membrane.
机译：使用P123和CTMABR作为孔引导剂，制备两种介孔二氧化硅，即SBA-15N和MSN的纳米颗粒，并加载到Nafion中？通过溶剂浇铸方法形成复合膜。用粉末 - XRD，N _（2）吸附，TGA，EA，SEM和〜（29）Si Mas NMR检查这些纳米颗粒的物理化学性质。比较甲醇渗透性，质子电导率和电池性能和纳米颗粒的量，无论是否除去孔引导剂和介孔二氧化硅的不同种类纳米颗粒。发现存在纳米颗粒内部的孔引导剂均可促进抵抗阴极的甲醇交叉。然而，仅SBA-15N内部的P123可以帮助质子转移，可能通过P123共聚物上的醚基团。含有萃取的SBA-15N的复合膜的质子电导率低于含有P123的膜。然而，在填充有乙醇萃取的MSN（ex-MSN）颗粒的复合膜上获得最高质子电导率。这归因于前MSN中存在的较大量的硅烷醇基团而不是提取的SBA-15N。在用5％Ex-MSN填充的复合膜上获得4.01×10〜（α2）Scm〜（α1）的最佳质子电导率，并且用该复合膜组装的单电池具有最高功率密度为131在60°C时MW cm〜（α2），比具有重新绘制普通氮膜的细胞高约2倍，比商业保证为商业保证金36％？ 117膜。

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