Molybdenum‐doped ordered L10‐PdZn nanosheets for enhanced oxygen reduction electrocatalysis

SusMat

Hsing‐Lin Wang¹  Yu Xia¹  Jinjia Liu²  Shuhong Jiao³  Ruiguo Cao³  Fanyang Huang³  Xuan Liu⁴  Shenzhou Li⁴  Jiantao Han⁴  Tanyuan Wang⁴  Qing Li⁴  Jiashun Liang⁴ 

[1] Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen China;Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan China;Key Laboratory of Materials for Energy Conversion Chinese Academy of Science (CAS), Department of Materials Science and Engineering University of Science and Technology of China Hefei China;State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China;

关键词: electrocatalysis;    fuel cell;    nanosheeets;    oxygen reduction;    Pd‐based intermetallics;   

DOI  :  10.1002/sus2.65

来源: DOAJ

【 摘 要 】

Abstract Ultrathin Pd‐based two‐dimensional (2D) nanosheets (NSs) with tunable physicochemical properties have emerged as promising candidate for oxygen reduction reaction (ORR). Unfortunately, structurally ordered Pd‐based NSs can be hardly prepared as high temperature annealing (>600°C) is necessary for disorder to order phase transition, making it a considerable challenge for morphology control. Herein, a new class of ultrathin structurally ordered Mo‐doped L10‐PdZn NSs with curved geometry and abundant defects/lattice distortions is reported as an efficient oxygen reduction electrocatalyst in alkaline solution. It is found that Mo(CO)6 serves as reducing agent and Mo source to generate the unique ordered 2D morphology, which leads to the significantly modified electronic structure. The developed L10‐Mo‐PdZn NSs exhibit excellent ORR mass activity of 2.6 A mgPd−1 at 0.9 V versus reversible hydrogen electrode, 31.5 and 17.6 times higher than those of Pd/C and Pt/C, respectively, outperforming most of the reported Pd‐based ORR electrocatalsyts. Impressively, L10‐Mo‐PdZn NSs is extremely stable for ORR, with only 2.3% activity loss after 10 000 potential cycles. Density functional theory study suggests that ordered L10 structure and Mo doping can raise the vacancy formation energy of Pd atom and thus promote the ORR stability.

【 授权许可】

Unknown