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Micromachines 2021, 12, 72 10 of 12 Micromachines 2021, 12, x 3.5. Effect of Micro-Porous Layer Composition on Performance of μDMFC 3.5.1. Effect of Different Carbon Loading Amounts on the Performance of μDMFC Carbon loading refers to the amount of carbon in the diffusion layer of the composite electrode. It has a significant influence on the internal structure compactness of the prepared appropriate carbon loading amount can not only diffuse methanol evenly throughout the catalyst layer but also reduce the methanol crossover that is unfavorable to cell performance. micro-porous layer and also has a great influence on the diffusion of methanol. An In this experiment, composite electrodes with carbon loading amounts of 1, 1.5, 2 and and 2.5 mg2/cm2 were prepared, respectively, and employed by μDMFC for testing. The 2.5 mg/cm were prepared, respectively, and employed by μDMFC for testing. The obtained I-P curves are shown in Figure 12. obtained I-P curves are shown in Figure 12. 11 of 13 Figure 12. Effect of different carbon loading amounts on the performance of μDMFC. Figure 12. Effect of different carbon loading amounts on the performance of μDMFC. FrromFiigurree12,,iittcanbeseentthattttheopttiimumcarrbonlloadiingoffrreducceedgrraapheenee 2 oxiideccompossiitteeelleeccttrroodeessisis11.5.5mgg//cm2. This result is different ffromtthattoffttrraadititioionnaall electrodes. In common commercial anode diffusion layers, optimal carbon loading is electrodes. In common commercial anode diffusion layers, optimal carbon loading is gen- generally 2 mg2/cm2, while the optimal carbon loading of the composite electrodes in erally 2 mg/cm , while the optimal carbon loading of the composite electrodes in this ex- this experiment is less than that of commercial electrodes. This shows that the reduced periment is less than that of commercial electrodes. This shows that the reduced graphene graphene oxide composite electrode prepared in this work has stronger electro-oxidation oxide composite electrode prepared in this work has stronger electro-oxidation catalytic catalytic ability for methanol. When the carbon loading is 12mg/cm2, peak power density ability for methanol. When the carbon loading is 1 mg/cm , peak power density is lower is lower than that at 1.52 mg/cm2 carbon loading, suggesting that methanol penetration is thanthatat1.5mg/cm carbonloading,suggestingthatmethanolpenetrationissevereat severe at this value, causing an increase in the cathodic over-potential and reducing overall this value, causing an increase in the cathodic over-potential and reducing overall fuel cell fuel cell performance. When the carbon loading is over 1.5 2mg/cm2 , fuel cell performance performance. When the carbon loading is over 1.5 mg/cm , fuel cell performance also de- also declines, which is due to the excessive carbon loading seriously hindering the diffusion clines, which is due to the excessive carbon loading seriously hindering the diffusion of of the methanol solution. The diffusion rate is lower than the methanol consumption rate, the methanol solution. The diffusion rate is lower than the methanol consumption rate, resulting in a decrease in the methanol content on the catalytic layer, and the performance resulting in a decrease in the methanol content on the catalytic layer, and the performance of the catalyst layer cannot be fully utilized. Therefore, the performance of the μDMFC of the catalyst layer cannot be fully utilized. Therefore, the performance of the μDMFC decreases. decreases. 3.5.2. Effect of Different PTFE Content Amounts on the Performance of μDMFC 3.5.2. Effect of Different PTFE Content Amounts on the Performance of μDMFC PTFE is added to the microporous layer for two main purposes. One is that it has a PTFE is added to the microporous layer for two main purposes. One is that it has a certain viscosity, which can increase the tightness of the diffusion layer and the catalyst certain viscosity, which can increase the tightness of the diffusion layer and the catalyst layer and reduce the ohmic polarization of the internal contact resistance; the other is that layer and reduce the ohmic polarization of the internal contact resistance; the other is that it can promote the formation of micropores in the microporous layer and facilitate the mass it can promote the formation of micropores in the microporous layer and facilitate the transfer of the methanol [22]. In order to explore the influence of PTFE content on fuel cell mass transfer of the methanol [22]. In order to explore the influence of PTFE content on performance, reduced graphene oxide composite electrodes with PTFE content of 0%, 5% fuel cell performance, reduced graphene oxide composite electrodes with PTFE content of and 10% were prepared and employed by the μDMFC for testing. The obtained I-P curves 0%, 5% and 10% were prepared and employed by the μDMFC for testing. The obtained I- are shown in Figure 13. P curves are shown in Figure 13.PDF Image | Micro Direct Methanol Fuel Cell Reduced Graphene Oxide
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