Lattice-mismatch-induced growth of ultrathin Pt shells with high-index facets for boosting oxygen reduction catalysis

作     者：Li, Xiang Liu, Yaming Bi, Wei Bi, Jinglei Guo, Ruiyun Li, Rui Wang, Chaoqi Zhan, Qi Wang, Weicong Yang, Shengchun Shi, Fenglei Wu, Jianbo Jin, Mingshang 

作者机构：Xian Technol Univ Sch Mat & Chem Engn Xian 710021 Shaanxi Peoples R China Xi An Jiao Tong Univ Frontier Inst Sci & Technol State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Sch Sci State Key Lab Mech Behav Mat Key Lab Shanxi Adv Mat & Mesoscop Phys Xian 710049 Shaanxi Peoples R China Shanghai Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China 

出 版 物：《JOURNAL OF MATERIALS CHEMISTRY A》 (材料化学杂志A)

年 卷 期：2020年第8卷第32期

页      面：16477-16486页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：National Natural Science Foundation of China (NSFC) [21773180, 21471123] State Key Laboratory for Mechanical Behavior of Materials, Key Scientific and Technological Innovation Team of Shaanxi Province [2020TD-001] Fundamental Research Funds for the Central Universities World-Class Universities (Disciplines) and the Characteristic Development Guidance Funds for the Central Universities Xi'an Technological University [0853-302020590] 

主　　题：Lattice mismatch 

摘      要：Owing to its high catalyzing nature, Pt holds great promise as an efficient catalyst for the oxygen reduction reaction (ORR). Although surface steps/kinks have been proven beneficial for the catalytic performance, constructing steps/kinks on Pt surfaces remains a big challenge due to the high surface energy. Herein, we demonstrate that the lattice mismatch can induce the growth of Pt shells with high-density steps on substrates. We exemplify it by depositing Pt shells on Pd-Cu alloy nanocubes, between which the lattice mismatch reaches 4.53%, and testing the resulting catalysts for the ORR. We show that Pt shells on Pd-Cu alloy nanocubes exhibit an extraordinary increase in both specific and mass activities of 32 and 16 times, respectively, as compared to the commercial Pt/C catalyst. Meanwhile, functional tests in proton exchange membrane fuel cells exhibit a 121.9 mW cm(-2)increase in power density for Pd-Cu@Pt compared to the commercial Pt/C catalyst. Our result indicates that lattice mismatch between Pt shells and Pd-Cu alloy cores plays a key role in forming surface steps, while Pt shells grown on Pd cores only cause the formation of Pd@Pt nanocubes without surface steps. This work suggests that lattice mismatch can serve as an efficient parameter for preparing ORR catalysts with excellent activity and durability.