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Micromachines 2021, 12, 72 8 of 12 Micromachines 2021, 12, x Micromachines 2021, 12, x 3.4.2. Effect of Pt-Ru Molar Ratio on the Performance of μDMFC In the Pt-Ru catalyst system, Ru can more easily reduce OH- in water than Pt, and it promotes the oxidation reaction of Pt intermediate products, which can effectively reduce CO adhesion on the surface of Pt due to incomplete oxidation, thereby enhancing the electrocatalytic performance of Pt [16]. However, excessive Ru will surround the surface of Pt particles, which will reduce the catalytic oxidation surface area of Pt particles. The influence of reduced graphene oxide composite electrodes with Pt-Ru molar ratios of 1:0.5, 1:1, 1:1.5 and 1:2 on the performance of μDMFC was investigated, and the results are shown in Figure 9. As shown in Figure 9, the μDMFC exhibits the best performance when the molar ratio of Pt:Ru is 1:1.5. When the molar ratio of Pt:Ru is 1:1, the content of Ru relative to Pt is insufficient and it is difficult to completely reduce the CO adhered o9noft1h3e surface 9 of 13 of Pt. When the molar ratios of Pt:Ru are 1:2 and 1:2.5, the content of Ru relative to Pt is excessive, which reduces the catalytic oxidation surface area of Pt particles. Figurree99..EEfffefcetcotfoPft-PRtu-RmuomlaorlrartioraotniothoenptehrefoprmerafonrcmeoafnμcDeMofFμCD. MFC. Figure 9. Effect of Pt-Ru molar ratio on the performance of μDMFC. 3.4.3. Effect of Pt Content on the Performance of μDMFC 3.4.3. Effect of Pt Content on the Performance of μDMFC 3.4.3. Effect of Pt Content on the Performance of μDMFC Pttisisoonneeofotfhtehmeaminaisntrosntrgocnagtaclaystatslyfosrtsthfoereltehcetreoloexcitdraotoioxnidoaftmioenthoafnoml.eTthaeonroelt.i-Theoreti- Pt is one of the main strong catalysts for the electrooxidation of methanol. Theoreti- cally,,ttheeppeerfrofromrmanacnecoef othfethcoemcopmosipteoseilteecteroledcetrwoidlleinwcrilelaisnecwreitahsethwe PitthctohnetePnt icnonthtent in the cally, the performance of the composite electrode will increase with the Pt content in the catalyst. However, excessive Pt content will cause cell performance degradation due to catalyst. However, excessive Pt content will cause cell performance degradation due to the catalyst. However, excessive Pt content will cause cell performance degradation due to the agglomeration of Pt particles [17]. Therefore, the Pt content in the catalyst cannot be agglomeration of Pt particles [17]. Therefore, the Pt content in the catalyst cannot be too the agglomeration of Pt particles [17]. Therefore, the Pt content in the catalyst cannot be too high. In this paper, reduced graphene oxide composite electrodes with Pt content of high. In this paper, reduced graphene oxide composite electrodes with Pt content of 10%, too high. In this paper, reduced graphene oxide composite electrodes with Pt content of 10%, 20%, 30% and 40% were prepared and employed into the μDMFC to investigate the 20%, 30% and 40% were prepared and employed into the μDMFC to investigate the effect 10%, 20%, 30% and 40% were prepared and employed into the μDMFC to investigate the effect of Pt content on the cell performance. The results obtained are shown in Figure 10. oefffPetctcofnPtetncotnotnentthoenctehlel pcelrlfpoerrmfoarnmcaen.cTe.hTehrerseuslutsltsobobtatainineedare shownininFFigiguurere101.0. Figure 10. Effect of Pt content on the performance of μDMFC. Figure 10. Effect of Pt content on the performance of μDMFC. Figure 10. Effect of Pt content on the performance of μDMFC. As shown in Figure 10, when the Pt content is 30%, the prepared composite electrode As shown in Figure 10, when the Pt content is 30%, the prepared composite electrode exhibits the best performance. When the Pt content increases from 10% to 30%, the peak exhibits the best performance. When the Pt content increases from 10% to 30%, the peak power density increases continuously, which indicates that Pt content has a positive im- power density increases continuously, which indicates that Pt content has a positive im- pact on the performance of the fuel cell. When the Pt content is less than or equal to 30%, pact on the performance of the fuel cell. When the Pt content is less than or equal to 30%, the dispersion of Pt in the carrier is not saturated, so there will be no agglomeration of Pt the dispersion of Pt in the carrier is not saturated, so there will be no agglomeration of Pt particles. However, when the Pt content increases to 40%, the dispersion of Pt in reducedPDF Image | Micro Direct Methanol Fuel Cell Reduced Graphene Oxide
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