Zhao Tonghui, Li Mengting, Xiao Dongdong, Yang Xiaoju, Li Qihao, An Lulu, Deng Zhiping, Shen Tao, Gong Mingxing, Chen Yi, Wang Gongwei, Zhao Xu, Xiao Li, Yang Xuan, Li Li, Wang Deli
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan430074, China.
The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Chongqing400044, China.
J Am Chem Soc. 2023 Feb 3. doi: 10.1021/jacs.2c11907.
Heteroepitaxial core-shell structure is conducive to combining the advantages of the epilayer and the substrate, creating a novel multifunctionality for catalysis application. Herein, we report a pseudomorphic-Pt atomic layer (PmPt) epitaxially growing on an IrPd-core matrix (PmPt@IrPd/C) as an efficient and stable catalyst for alkaline hydrogen oxidation reaction that exhibits ∼29.2 times more mass activity enhancement than that of benchmark Pt/C. The PmPt@IrPd/C catalyst also gives rise to ∼25.0 times more enhancement than Pt/C during a 50,000-cycle accelerated stability test. This robust stability originates from the resistance to carbon corrosion owing to the stronger HO interaction instead of carbon oxide (CO) poison species, and the modulated hydroxyl (OH*) adsorption could inhibit the OH* species from shuffling the surface Pt atoms away from the substrate. Moreover, the anion-exchange membrane fuel cells assembled by PmPt@IrPd/C with an ultralow Pt loading of 0.009 mg cm in the anode can deliver a power density of 1.27 W cm.
异质外延核壳结构有利于结合外延层和基底的优势，为催化应用创造新的多功能性。在此，我们报道了一种在IrPd核基体上外延生长的赝晶铂原子层（PmPt@IrPd/C），作为一种高效稳定的碱性氢氧化反应催化剂，其质量活性增强比基准Pt/C高约29.2倍。在50000次循环加速稳定性测试中，PmPt@IrPd/C催化剂的增强倍数也比Pt/C高约25.0倍。这种强大的稳定性源于对碳腐蚀的抗性，这是由于更强的羟基相互作用而非碳氧化物（CO）中毒物种，并且调制的羟基（OH*）吸附可以抑制OH*物种将表面铂原子从基底上移开。此外，由PmPt@IrPd/C组装的阳极超低铂负载量为0.009 mg cm的阴离子交换膜燃料电池可提供1.27 W cm的功率密度。
