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Micromachines 2021, 12, 72 7 of 12 Micromachines 2021, 12, x 2 thanthatachiieveedbythehiigh--tteemppeerartauturereppoloyloylomlmetehtohdo.dT.hTishicsacnaninidnicdaitceatehathtathtethesame Figure 6. Performance curve of μDMFC prepared under optimal process parameters. 3.3. Effect of Impregnation Reduction Method on the Performance of μDMFC 3.3. Effect of Impregnation Reduction Method on the Performance of μDMFC IIntthhisiswworokr,kt,hteheffefcftescotsfdoifffdeirfefnetrepnretpareaptiaornamtioenthomdestohnodthseopnrothpertpiersopoefrtthiesofthe μμDMFCweerereinivnevsetisgtaigteadte;dth;ethcaetaclaytsatlywsatswparespparedpabryedthbeyhitghhe-themigphe-rtaetmurpeepraotlyuorlepolyol method with ethylene glycol as the reducing agent and the impregnation reduction method with ethylene glycol as the reducing agent and the impregnation reduction method method with sodium borohydride as the reducing agent. An anode electrode was pre- with sodium borohydride as the reducing agent. An anode electrode was prepared and pared and employed by μDMFC for testing. The results are shown in Figure 7. employed by μDMFC for testing. The results are shown in Figure 7. Figure 7. Effects of different preparation methods on the performance of μDMFC. Figure 7. Effects of different preparation methods on the performance of μDMFC. It can be seen from Figure 7 that when the other preparation conditions and operating It can be seen from Figure 7 that when the other preparation conditions and operating conditions are consistent, the cell performance with the impregnation reduction method conditions are consistent, the cell performance with the impregnation reduction method is higher than when the high-temperature polyol method is used. The reduced graphene is higher than when the high-temperature polyol method is used. The reduced graphene oxide composite electrode prepared by the impregnation reduction method reached the oxide composite electrode prepared by the impregnation reduction method reached the 2 peakpoweerrddenensistyityofo2f42.34.m3Wm/Wcm/camt10a5tm10A5lmoaAdinlogacduirnrgenctu,rwrehnicth,whasic1h3.w7%ash1ig3h.7e%r higher saamoeuanmtoufnrteodfurceidnugcainggeangteNntaNBHaBHh4ahsahsihgihgehrereredduucciibiilliitythanetthyylelenneeglgylcyoclo.l. 4 3.4. Effect of Composition of Catalytic Layer on the Performance of μDMFC 3.4. Effect of Composition of Catalytic Layer on the Performance of μDMFC 3.4.1. Effects of Different Catalyst Carriers on the Performance of μDMFC 3.4.1. Effects of Different Catalyst Carriers on the Performance of μDMFC In order to explore the effects of different catalyst carriers on the performance of In order to explore the effects of different catalyst carriers on the performance of μDMFC, reduced graphene oxide and the common Vulcan XC-72 carbon were selected as μDMFC, reduced graphene oxide and the common Vulcan XC-72 carbon were selected as the carriers for comparison, and the results obtained are shown in Figure 8. It can be seen the carriers for comparison, and the results obtained are shown in Figure 8. It can be seen from the figure that μDMFC with composite electrodes using reduced graphene oxide as from the figure that μDMFC with composite electrodes using reduced graphene oxide as the carbon carrier have the better performance, with nearly 30% higher peak power density the carbon carrier have the better performance, with nearly 30% higher peak power den- than that using Vulcan XC-72 carbon. It can be found that under the same amount of Pt sity than that using Vulcan XC-72 carbon. It can be found that under the same amount of load condition, reduced graphene oxide displays a better Pt loading characteristic due to Pt load condition, reduced graphene oxide displays a better Pt loading characteristic due ittosiltasrlgaergresrpsepceicfiicficsusurfrafacceeareacomparredtotoththeetrtardaidtiiotnioanlacalrcbaornbocanrrciaerr.ier. 8 of 13 Figure 8. Effect of composition of catalytic layer on the performance of μDMFC. Figure 8. Effect of composition of catalytic layer on the performance of μDMFC. 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 elec- trocatalytic 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 influ-PDF Image | Micro Direct Methanol Fuel Cell Reduced Graphene Oxide
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