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Micromachines 2021, 12, x Micromachines 2021, 12, 72 12 of 13 better than that without adding PTFE. When the PTFE content reaches 10%, it can be seen that the cell performance is lower than the performance without adding PTFE. This clearly seen that the cell performance is lower than the performance without adding PTFE. is because PTFE also has some hydrophobicity; the hydrophobicity of the electrode can This is because PTFE also has some hydrophobicity; the hydrophobicity of the electrode hinder the diffusion of fuel and thereby lead to mass transfer polarization [23]. When the can hinder the diffusion of fuel and thereby lead to mass transfer polarization [23]. When PTFE content is 5%, the positive effect of its cohesiveness and pore-making ability on the 11 of 12 Fiigurre13..EfffecttoffdiiffferreenttPTFEccoontteenttaamoounttssoonntthheeppeerrffoorrmaanncceeooffμμDMFFCC. . It can be seen that when the PTFE content reaches 5%, the fuel cell performance is It can be seen that when the PTFE content reaches 5%, the fuel cell performance is better than that without adding PTFE. When the PTFE content reaches 10%, it can be clearly the PTFE content is 5%, the positive effect of its cohesiveness and pore-making ability on mass transfer polarization is greater than the adverse effect of hydrophobicity. Therefore, the mass transfer polarization is greater than the adverse effect of hydrophobicity. There- the μDMFC achieved the best performance with the PTFE content of 5%. fore, the μDMFC achieved the best performance with the PTFE content of 5%. 4. Conclusions 4. Conclusions From the experimental data, it was concluded that the selection of materials in the From the experimental data, it was concluded that the selection of materials in the synthesis of the catalyst and the composition of the anode composite electrode can signifi- synthesis of the catalyst and the composition of the anode composite electrode can signif- cantly affect the performance of the fuel cell, all of which needs to be carefully controlled icantly affect the performance of the fuel cell, all of which needs to be carefully controlled to ensure optimal performance. The parameters in the preparation process also have a to ensure optimal performance. The parameters in the preparation process also have a great influence on the quality of the membrane, which also directly affects the performance great influence on the quality of the membrane, which also directly affects the perfor- of μDMFC. Under the experimental conditions, when the composition of the anode com- mance of μDMFC. Under the experimental conditions, when the composition of the anode posite electrode includes a reduced graphene oxide catalyst carrier, 30% Pt content, 1:1.5 composite electrode includes a reduced graphene oxide catalyst carrie2r, 30% Pt content, Pt-Rumolarratio,10%Nafioncontent,5%PTFEcontentand1.5mg/cm carbonload,the 1:1.5 Pt-Ru molar ratio, 10% Nafion content, 5% PTFE content and 1.5 mg/cm2 carbon load, micro direct methanol fuel cell demonstrates the best power performance. In this paper, the micro direct methanol fuel cell demonstrates the best power performance. In this pa- the influence of the composition of the anode composite electrode on the micro direct per, the influence of the composition of the anode composite electrode on the micro direct methanol fuel cell is deeply studied, and a feasible strategy is provided for improving the methanol fuel cell is deeply studied, and a feasible strategy is provided for improving the performance of the methanol fuel cell based on the reduced graphene oxide composite performance of the methanol fuel cell based on the reduced graphene oxide composite electrode. For a complete membrane electrode, the cathode electrode is equally important, electrode. For a complete membrane electrode, the cathode electrode is equally important, so further research can focus on the influence of the preparation method and composition so further research can focus on the influence of the preparation method and composition of the cathode electrode on the performance of μDMFC. of the cathode electrode on the performance of μDMFC. Author Contributions: Supervision, C.L.; project administration, funding acquisition, L.W. and G.W.; wAruitihnogr—Croenvtireiwbuatniodnesd:iStuinpge,rLv.iYsi.oan,dCJ..LY..;;pwrroijteicntga—dmoringisntaraltdioranf,tfpurnedpianrgataicoqnu,iSs.iHtio.;nd,aLt.aWc.uarnatdion, YG.X.W. a.;nwdrWiti.nYg.;—inrvevesietiwgaatniodne,dLi.tLin.;gA,Lll.Ya.uatnhdorJs.Yh.a;vwerirteinagd—anodrigaignraeledratofttphrepaurbaltisohne,dS.Hve.r;sdiaotnaof tchuermatiaonnu,sYcr.Xip.ta.nd W.Y.; investigation, L.L.; All authors have read and agreed to the published version of the manuscript. Funding: This research was supported by the “Zhejiang Provincial Natural Science Foundation, Funding: This research was supported by the “Zhejiang Provincial Natural Science Foundation, grant number LGG19F040004 and LQ19F040007”, “National Natural Science Foundation of China, grant number LGG19F040004 and LQ19F040007”, “National Natural Science Foundation of China, grant number 61704041 and 61804038”, “Zhejiang Provincial Key Research & Development Project, grant number 61704041 and 61804038”, “Zhejiang Provincial Key Research & Development Pro- grant number 2019C04003” and “National Key R&D Program Grant, grant number 2018YFE0120000”. ject, grant number 2019C04003” and “National Key R&D Program Grant, grant number Conflicts of Interest: The authors declare no conflict of interest. 2018YFE0120000”. Conflicts of Interest: The authors declare no conflict of interest.PDF Image | Micro Direct Methanol Fuel Cell Reduced Graphene Oxide
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