Improve methanol efficiency for direct methanol fuel cell system via investigation and control of optimal operating methanol concentration

• Published in: Energy (Oxford) 2024-03, Vol.290, p.130147, Article 130147
• Main Authors: Chi, Xuncheng, Chen, Fengxiang, Mo, Tiande, Li, Yu, Wei, Wei
• Format: Article
• Language: English
• Subjects: Adaptive observer; algorithms; Direct methanol fuel cell (DMFC); energy conversion; energy use and consumption; fuel cells; methanol; Methanol concentration; Methanol efficiency; Sliding mode algorithm
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2023.130147

This study investigates and controls the optimal operating methanol concentration for direct methanol fuel cell (DMFC) system, which effectively improves the efficiency of DMFC system. Firstly, a DMFC output characteristic model and a nonlinear stack methanol concentration model were established. Moreover, an adaptive observer was developed to reconstruct unmeasurable stack methanol concentration to estimate methanol concentration. Then, in order to achieve the minimum methanol consumption under required power, the reference methanol concentration was determined by analyzing DMFC system with its maximum energy conversion efficiency. Finally, the sliding mode algorithm was adopted to track reference optimal methanol concentration. The estimated performance of adaptive observer and non-adaptive observer for methanol concentration was compared through experimental bench data. Furthermore, the methanol consumption and energy conversion efficiency under proposed optimal methanol concentration strategy and fixed methanol concentration were compared. The comprehensive result demonstrates that the adaptive observer has better performance than non-adaptive observer in terms of estimated performance. Moreover, the proposed strategy for optimal methanol concentration was compared with fixed methanol concentration of 0.3 mol/L and 0.4 mol/L, and the fuel consumption of DMFC system was reduced by 7.9% and 30.9% respectively. •Establish DMFC stack methanol concentration model and analysis its characteristic.•Describe quantitatively energy conversion efficiency of DMFC system.•Propose adaptive observer to monitor DMFC stack methanol concentration with good robustness and adaptability.•Design the strategy of maximum energy conversion efficiency and improve methanol utilization.