State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China.
Shenzhen Research Institute of Hunan University, Shenzhen, 518057, Guangdong, P. R. China.
Chem Asian J. 2023 May 2;18(9):e202300137. doi: 10.1002/asia.202300137. Epub 2023 Mar 28.
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) are crucial in future energy systems. However, the activity and stability of the electrocatalysts are severely restricted by high temperature and phosphoric acid poisoning. Herein, PtCe alloy as oxygen reduction reaction (ORR) electrocatalyst for HT-PEMFCs exhibits fantastic performance. Ce can increase the electronic density of Pt, weakening phosphoric acid poisoning and improving ORR activity. The optimized electronic structure can also reduce the dipole effect between Pt and O, which suppresses the irreversible oxidation of Pt. Additionally, the dramatically negative heat of formation in PtCe catalyst brings high kinetic barrier of metal diffusion and dissolution. With this electrocatalyst, the HT-PEMFCs show a preeminent peak power of 605 mW cm with 0.3 mg cm . After 30000 cycles of accelerated stability test, the peak power density only decreases by 31.6%, achieving the goal of Department of Energy in 2020 (<40% loss).
高温质子交换膜燃料电池（HT-PEMFC）在未来能源系统中至关重要。然而，电催化剂的活性和稳定性受到高温和磷酸中毒的严重限制。在此，PtCe 合金作为 HT-PEMFC 的氧还原反应（ORR）电催化剂表现出优异的性能。Ce 可以增加 Pt 的电子密度，减弱磷酸中毒并提高 ORR 活性。优化的电子结构还可以降低 Pt 和 O 之间的偶极效应，从而抑制 Pt 的不可逆氧化。此外，PtCe 催化剂具有显著的负生成热，带来了金属扩散和溶解的高动力学障碍。使用这种电催化剂，HT-PEMFC 的峰值功率达到了 605 mW cm ，在 0.3 mg cm 的载量下，经过 30000 次加速稳定性测试后，峰值功率密度仅下降了 31.6%，达到了 2020 年能源部的目标（<40%的损失）。
