Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (10): 2653-2658.doi: 10.3866/PKU.WHXB20100918

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Preparation and Properties of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Composites for Solid Alkaline Electrolyte Membranes

FU Jing1,2, LIN Rui2, LV Hong2, WANG Xiao-Lei2, MA Jian-Xin1,2, QIAO Jin-Li3   

  1. 1. School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China;
    2. Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, P. R. China;
    3. School of Environmental Science and Engineering, Donghua University, Shanghai 201260, P. R. China
  • Received:2010-03-16 Revised:2010-05-09 Published:2010-09-27
  • Contact: MA Jian-Xin, QIAO Jin-Li E-mail:jxma@tongji.edu.cn; qiaojl@dhu.edu.cn
  • Supported by:

    The project was supported by the Pujiang Foundation (08PJ14096), Natural Science Foundation of Shanghai Science and Technology Committee (09ZR1433300) and Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education, China (2009(1001)).

Abstract:

Solid alkaline electrolyte membranes were prepared using poly(vinyl alcohol)/poly(vinyl pyrrolidone) (PVA/PVP) by KOH doping. The composition, microstructure, thermal stability, ionic conducitvity and methanol uptake of the composite membranes were investigated in detail. The wholly transparent, homogeneous and compact PVA/PVP/KOH composite membranes were obtained when m(PVA) :m(PVP)=1 :0.5 in a mass ratio and no obvious phase seperation was observed. The ionic conductivity and thermal stability of the PVA/PVP membranes increased greatly with increasing the content of PVP. A high ionic conductivity of 2.01 ×10-3 S·cm-1 was obtained whena mass ratio of m(PVA) :m(PVP)=1 :1 was used. In additon, the methanol uptake of the PVA/PVP/KOH membranes showed almost no change after conditioning at elevated temperatures and it was 4 times lower than that of the Nafion 115 membrane after conditioning at 100 ℃. These membranes are, therefore, promising solid alkaline electrolyte membranes for use in alkaline direct methanol fuel cells at elevated operating temperature.

Key words: Solid alkaline electrolyte membrane, Poly(vinyl alcohol), Poly(vinyl pyrrolidone), Ionicconductivity, Methanol uptake, Thermal stability

MSC2000: 

  • O646