Influence of inlet gas relative humidity on stack performance of PEMFC under variable load condition
HU Chao1, LUO Maji1, CHEN Yun1, ZHANG Ruiming2,3
(1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan， Hubei 430070， China; 2. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan， Guangdong 528000, China; 3. Guangdong Hydrogen Energy Institute of WHUT, Foshan， Guangdong 528000, China)
Abstract：To investigate the effect of inlet gas relative humidity on the performance of proton exchange membrane fuel cell stack under variable load conditions, the dynamic cycling condition was designed with two step conditions of current densities ranging from 0.10 to 0.35 A/cm2 and from 0.10 to 1.00 A/cm2, and steady state condition of current densities of 0.10, 0.35 and 1.00 A/cm2. Five sets of tests with humidity levels of 20%, 30%, 50%, 70% and 80% were performed. The results show that the sensitivity of the stack to humidity is different at different current densities under the constant current condition, and humidity has great impact on the stack performance at high current density. The stack voltage appears to be downstroke and upstroke in the variable load process, and the amount of voltage downstroke in the loading process is related to the variable load amplitude and humidity, while the voltage consistency of single cell of the stack is deteriorated and related to the inlet gas relative humidity.
MOCOTEGUY P, LUDWIG B, STEINER N. Influence of ageing on the dynamic behaviour and the electrochemical characteristics of a 500 We PEMFC stack[J]. International Journal of Hydrogen Energy, 2014, 39(19):10230-10244.
［3］
MENG K, CHEN B, ZHOU H R, et al. Investigation on degradation mechanism of hydrogen-oxygen proton exchange membrane fuel cell under current cyclic loading[J]. Energy, DOI:10.1016/j.energy.2021.123045.
［4］
全文祥. 工作参数对PEMFC运行特性影响的实验研究[D].岳阳: 湖南理工学院,2020.
［5］
OZEN D N, TIMURKUTLUK B, ALTINISIK K.Effects of operation temperature and reactant gas humidity levels on performance of PEM fuel cell[J]. Renewable and Sustainable Energy Reviews, 2016, 59: 1298-1306.
［6］
JANICKA E, MIELNICZEK M, GAWEL L, et al. The impact of air humidity on the operation of proton exchange membrane fuel cells determined using dynamic electrochemical impedance spectroscopy[J]. Electrochimica Acta, DOI:10.1016/j.electacta.2020.136036.
［7］
WEI G H, LU J B, ZHANG Q L, et al. Analyze the effects of flow mode and humidity on PEMFC performance by equivalent membrane conductivity[J]. International Journal of Energy Research, 2019,43(9):4592-4605.
LI Y M, DAI H F, YUAN H. Influence of intake condition on dynamic response of PEMFC[J]. Battery Bimonthly, 2021,51(2):122-125.(in Chinese)
［9］
LI X L, HAN K, SONG Y. Dynamic behaviors of PEM fuel cells under load changes[J]. International Journal of Hydrogen Energy, 2020,45(39):20312-20320.
［10］
SHEN Q, HOU M, YAN X Q, et al. The voltage characteristics of proton exchange membrane fuel cell (PEMFC) under steady and transient states[J]. Journal of Power Sources, 2008,179(1):292-296.
ZHU J Y, TAN J Z, SUN A. Effects of cathode relative humidity on the electrochemical performance of proton exchange membrane fuel cell[J]. Journal of Nanjing Tech University(Natural Science Edition), 2021,43(4):456-460.(in Chinese)
HOU Y P, CHEN K, LAN H. Evaluation of voltage uniformity of PEMFC stack based on cycle condition[J].Battery Bimonthly, 2021,51(3): 216- 220.(in Chinese)
