: TM9 11 : A DMFC. ], Los Alamos. Motorola. 10. Manhattan, Pt- Ru, Vol. 7 No. 2 May 2001 EL ECTROCHEMISTR Y : (2001) (1.

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1 EL ECTROCHEMISTR Y Vol 7 No 2 May 2001 : (2001) , 1, 1, 1, 1, 2 1 1, (1, ; 2, ) : Pt- Ru/ C Pt/ C,Nafion-115, 9 cm 2,,,, : ; Pt- Ru/ C,Pt/ C, ; ; : TM9 11 : A (DMFC),, [19 ] [10 ], Los Alamos Motorola DMFC, 10 Manhattan, 2, , Pt- Ru, Pt Nafion,,- (MEA),, : , : :

2 2 : Pt- Ru,Pt 20 wt %,Ru 10 wt % : PTFE, Nafion 10 wt %, mg/ cm 2 Pt- Ru/ C Nafion (10 wt %),,, Nafion Pt- Ru 2 mg/ cm 2 Pt,, PTFE Nafion, PTFE 10 wt % 10 wt % Nafion Pt/ C Pt 1 mg/ cm 2 Nafion-115 [ 11,12 ] Nafion wt % H 2 O h, 1 0 mol/ L H 2 SO h,, 1 2 Nafion-115,100 kg/ cm 2 135, - (MEA), 9 cm mol/ L, ml/ min, ,,, MEA [13,14 ], d 1 - : 75, 1 0 mol/ L, 1 0 ml/ min, 0 2 MPa 1 1, Fig 1 Polarization and power density curves of DMFC 200 mv at 75,1 0 mol/ L methanol concentration and 0 2 MPa oxygen pressure

3 , 50 ma/ cm 2, V- I, 350 ma/ cm 2, MEA 1, ma/ cm 2,, 75 mw/ cm 2 ( W/ cm 2 ), Pt- Ru, Nafion [1518 ], 2 2, 2 V- I 0 5 mol/ L, 150 ma/ cm 2,, 1 0 mol/ L - 3,,, 50 mv,, 2 DMFC Fig 2 The effect of methanol concentration on the performance Of DMFC at 75,0 2 MPa oxygen pressure 3 DMFC Fig 3 The effect of oxygen pressure on the the perfor2 mance of DMFC at 75,1 0 mol/ L methanol,4,, Pt- Ru/ C 60 [5,11 ], DMFC 60130,, Nafion, 130

4 2 : 231 5,, V- I 4,, ( 2030 mv), 21 % 4 DMFC 5 DMFC Fig 4 Polarization curves of DMFC at various temperaures CH 3 OH concentration 1 0 mol/ L, oxygen pressure 0 2 MPa Fig 5 Polarization curves of DMFC at air pressure 0 2 MPa and Various temperatures CH 3 OH concen2 tration :1 0 mol/ L 2, 50 ma/ cm 2, 6, 23 h ; 1, 2,,, Pt- Ru/ C, 6 DMFC Fig 6 The discharge cruves of DMFC operit2 DMFC ing at 25, 1 0mol/ L methanol,0 2 MPa oxygen pressure 3 Pt- Ru/ C Nafion, Pt/ C PTFE, Nafion2115, kg/ cm 2 MEA, 75,1 0 mol/ L 0 2 MPa, 75 mw/ cm 2,

5 ,, Pt- Ru/ C, 65, 1 0 mol/ L,, Performance of a Direct Met hanol Fuel Cell WEI Zhao- bin 1,L IU Jian-guo 1,J IAO Ya-guang 1,ZHOU Wei-jiang 1 L I Wen-zhen 1,CHEN Li- kang 2,XIN Qin 1, YI Bao-lian 1 (1 Dalian Inst of Chem Phys, Chinese A cad of Sci, Dalian , China ; 2 A nhui N ingguo Tiancheng Elect ric Co, L TD, N inggo , China) Abstract : A direct methanol fuel cell with 9cm 2 active area consists of Pt- Ru/ C anode, Pt/ C cat hode and Nafion 115 membrane The effect of operating conditions : met hanol solution concen2 t ration,oxygen pressure and cell temperat ure on t he cell performances was investigated The re2 sult s show t hat performance of single cell was enhanced by increasing oxygen pressure and cell temperature,and a maximum power density 75 mw/ cm 2 was obtained in the range of ma/ cm 2 current density,0 2 MPa oxygen pressure,1 0 mol/ L methanol concentration and 75 cell temperat ure When cell operating at room temperat ure,a relatively low, but a stable perfor2 mance of cell was also observed Key words : DMFC, Pt- Ru/ C, Pt/ C, Polymer electrolyte, Performance of cell, Polarization curve Reference s : [1 ] Wang J- T,Wainright J S,Savinell R F, et al A direct methanol fuel cell using acid- doped plybenzimidazole as polymer electrolyte [J ] J Appl Eletrochem,1996,26 :751 [ 2 ] Parilumar M K,Shukla A K Effect of methanol crossover in a liquid-feed polymer-electrolyte direct methanol fuel cell [J ] J Electrochem Soc,1996,143 :2601 [3 ] Ramkumar R,Dheenadalan S, Pattabiraman R Development of porous carbon eletrodes for direct methanol fuel cells [J ]J Power Sources,1997,69 :75 [4 ] Arico A S,Creti P,Antonucci P L, et al Optimization of operating parameters of a direct methanol fuel cell and physico-chemical investigation of catalyst- electrolyte interface [J ] Electrochem Acta,1998,43 :3 719 [5 ] J ung D H,Lee C H, Kim C S,et al Performance of a direct methanolpolymer electrolyte fuel cell [J ]J Pow2 er Sources,1998,71 :169

6 2 : 233 [6 ] Liu L, Pu C,Viswanathan R,et al Carbon supported and unsupported Pt- Ru anodes for liquid feed direct methanol fuel cells [J ] Electrochem Acta,1998,43 :3657 [ 7 ] Shukla A K,Christensen P A,Dichinson A J, et al A liquid-feed solid polymer electrolyte direct methanol fuel cell operating at near-ambient conditions [J ]J Power Sources,1998,76 :54 [ 8 ] Scott K, Taama W,Cruchshank J Performance of a direct methanol fuel cell [J ]J Appl Electrochem,1998, 28 :289 [9 ] Baxter S F,Battaglia V S,White R E Methanol fuel cell model :anode [J ] J Electrochem Soc,1999,146 : 437 [10 ] Motorola Los Alamos report progress in miniature fuel cells [J ] Fuel Cell Bulletin,2000,18 :1 [11 ] Scott K, Taama W M,Argyropoulos P Engineering aspects of the direct methanol fuel cell system [J ] J Power Sources,1999,79 :43 [12 ] Ren X,Wilson M S, Gottesteld S High performance direct methanol polymer electrolyte fuel cells [J ] Elec2 trochem Soc, :L12 [13 ] Shukla A K,Ravilumar M K,Neergat M,et al A 5W liquid-feed solid-polymer-electrolyte direct methanol fuel cell stack with stainless steel [J ]J Appl Elctrochem,1999,29 :129 [14 ] Argyropoulos P,Scott K, Taama W M Carbon dioxide evolution patterns in direct methanol fuel clls [J ] Electrochimi Acta,1999,44 :3 575 [15 ] Pivovar B S,Wang Y,Cussler E L Pervaporation membranes in direct methanol fuel cells [J ] J Membr Scie,199,154 :155 [ 16 ] Kuver K,Potje- Kamloth K Comparative study of methanol crossover across electropolymerized and commer2 cial proton exachange membrane eletrolytes for the acid direct methanol fuel cell [ J ] Elctrochem Acta, 1998,43 :2 527 [17 ] Cruickshank J,Scott K The degree and effect of methanol crossover in the direct methanol fuel cell [J ] J Power Sources,1998,70 :40 [18 ] Kuver A, Vielstich W Investigation of methanol crossover and single electrode performance during PEMDMFC operation A study using a solid polymer electrolyte membrane fuel cell system [J ] J Power Sources,1998,74 :211