摘要
膜电极是直接甲醇燃料电池的核心部件,其制备工艺直接影响膜电极的微观结构,进而影响电池性能.采用质子交换膜担载催化剂方法制备含有内催化层的膜电极,同时采用气体扩散层上喷涂催化剂的方法制备含有外催化层的气体扩散电极,再用热压的方法将含有内催化层的薄型膜电极与含有外催化层的气体扩散电极热压在一起,从而制备含有双催化层结构的膜电极.结果表明:采用质子交换膜双侧同时化学镀铂/铂钌的方法,催化剂镀层与质子交换膜结合力良好,镀层纯净均匀无皲裂;在新型双催化层膜电极中从质子交换膜到扩散层方向形成了催化剂浓度梯度、孔隙率梯度和疏水/亲水性梯度3个梯度,有利于传质及反应物的电化学反应,从而提高微型直接甲醇燃料电池MEA的性能.
As a key component of direct methanol fuel cell （DMFC）,the micro structure and property of membrane electrode assembly （MEA） are largely affected by fabrication technology.Catalyst coated membrane （CCM） was employed to prepare MEA with inner catalyst layer.Gas diffusion electrode （GDE） was fabricated with spraying catalyst ink to gain outer catalyst layer.Hot pressing method was used to obtain a novel double-catalyst layer MEA.Electroless deposition of catalysts on both sides of the proton exchange membrane （PEM） was introduced to prepare MEA with CCM.The results show that the bonding property between electroless catalyst film and PEM is good,and the catalyst layer is pure with Pt in cathode side and PtRu in anode side without crack.From PEM to gas diffusion layer in the novel MEA,three gradients of catalyst concentration gradient,porosity gradient and hydrophilicity gradient are formed.The gradients may be beneficial to mass transfer and electrochemistry reaction in MEA to improve the performance of μDMFC.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第6期626-630,共5页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(21106060)
中国博士后科学基金资助项目(2012M511950)
云南省科学基金资助项目(2010ZC015)
