Gao Saisai, Zhao Haidong, Gao Pengfei, Bi Jinglei, Liu Dan, Zhu Daolong, Wang Bin, Yang Shengchun
MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China.
Shaanxi Coal and Chemical Industry Technology Research Institute Co., Ltd., Xi'an 710100, China.
ACS Appl Mater Interfaces. 2022 Aug 3;14(30):34750-34760. doi: 10.1021/acsami.2c08510. Epub 2022 Jul 22.
Platinum-palladium (PtPd) alloy catalysts with high durability are viable substituents to commercial Pt/C for proton exchange membrane fuel cells (PEMFCs). Herein, a facile approach for gram-scale preparation of PtPd alloy nanoparticles on carbon black is developed. The optimized PtPd/B-C catalyst shows a mass activity (MA) of 0.549 A mg and a specific activity (SA) of 0.463 mA cm at the rotating disk electrode (RDE) level, which are 3.4 and 1.9 times those of commercial Pt/C, respectively. In H/O and H/air PEMFCs, the membrane electrode assembly (MEA) with PtPd/B-C achieves peak power densities of 2.33 and 1.04 W cm, respectively, and shows negligible performance degradation after 100 h of running in H/O conditions. Moreover, the MA of MEA with PtPd/B-C in H/O PEMFC reaches 0.978 A mg beyond the 2020 target of the Department of Energy (DOE) of 0.44 A mg. After 30k cyclic voltammetry cycles in PEMFC, the MA loss and cell voltage loss of MEA with PtPd/B-C are well within the DOE 2020 target. Density functional theory calculations reveal that the PtPd(111) surface can weaken the adsorption of *OOH and *OH compared to the Pt(111) surface, indicating that PtPd/B-C is more energetically favorable for the oxygen reduction reaction (ORR) than commercial Pt/C. This study offers a new approach for batch preparation of PtPd alloy-based catalysts for PEMFCs.
具有高耐久性的铂钯（PtPd）合金催化剂是用于质子交换膜燃料电池（PEMFC）的商业Pt/C的可行替代物。在此，开发了一种在炭黑上克级制备PtPd合金纳米颗粒的简便方法。优化后的PtPd/B-C催化剂在旋转圆盘电极（RDE）水平下的质量活性（MA）为0.549 A mg，比活性（SA）为0.463 mA cm，分别是商业Pt/C的3.4倍和1.9倍。在氢/氧和氢/空气PEMFC中，具有PtPd/B-C的膜电极组件（MEA）分别实现了2.33和1.04 W cm的峰值功率密度，并且在氢/氧条件下运行100小时后性能降解可忽略不计。此外，在氢/氧PEMFC中具有PtPd/B-C的MEA的MA超过了美国能源部（DOE）2020年0.44 A mg的目标，达到0.978 A mg。在PEMFC中进行30k次循环伏安循环后，具有PtPd/B-C的MEA的MA损失和电池电压损失完全在DOE 2020目标范围内。密度泛函理论计算表明，与Pt(111)表面相比，PtPd(111)表面可以减弱OOH和OH的吸附，这表明PtPd/B-C在能量上比商业Pt/C更有利于氧还原反应（ORR）。本研究为批量制备用于PEMFC的PtPd合金基催化剂提供了一种新方法。
