Abstract
Proton exchange membrane fuel cell(PEMFC)is of paramount significance to the development of clean energy.The components of PEMFC are assembled using many pairs of nutsand bolts.The assembly champing bolt torque is criti-cal to the electrochemical performance and mechanical stability of PEMFC.In this paper,a PEMFC with the three-channel serpentine flow field was used and studied.The different assembly clamping bolt torques were applied to the PEMFC in three uniform assembly bolt torque and six non-uniform assembly bolt torque conditions,respec-tively.And then,the electrochemical performance experiments were performed to study the effect of the assembly bolt torque on the electrochemical performance.The test results show that the assembly bolt torque significantly affected the electrochemical performance of the PEMFC.In uniform assembly bolt torque conditions,the maximal power density increased initially as the assembly bolt torque increased,and then decreased on further increasing the assembly torque.It existed the optimum assembly torque which was found to be 3.0 N·m in this work.In non-uni-form assembly clamping bolt torque conditions,the optimum electrochemical performance appeared in the condi-tion where the assembly torque of each bolt was closer to be 3.0 N·m.This could be due to the change of the contact resistance between the gas diffusion layer and bipolar plate and mass transport resistance for the hydrogen and oxy-gen towards the catalyst layers.This work could optimize the assembly force conditions and provide useful informa-tion for the practical PEMFC stack assembly.
基金项目
National Natural Science Foundation of China(52275152)
NETL
NSTL
万方数据