Molybdenum-doped ordered L1 0 -PdZn nanosheets for enhanced oxygen reduction electrocatalysis

SusMat

article

Jiashun Liang¹  Yu Xia²  Xuan Liu¹  Fanyang Huang⁴  Jinjia Liu⁵  Shenzhou Li¹  Tanyuan Wang¹  Shuhong Jiao⁴  Ruiguo Cao⁴  Jiantao Han¹  Hsing-Lin Wang²  Qing Li¹ 

[1] State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology;Department of Materials Science and Engineering, Southern University of Science and Technology;School of Physics and Astronomy, University of Birmingham;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;Institute of Coal Chemistry, Chinese Academy of Sciences;National Energy Center for Coal to Clean Fuels, Synfuels China Co., Ltd

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

DOI  :  10.1002/sus2.65

学科分类：电力

来源: Wiley

【 摘 要 】

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 L1 0 -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 L1 0 -Mo-PdZn NSs exhibit excellent ORR mass activity of 2.6 A mg Pd −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, L1 0 -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 L1 0 structure and Mo doping can raise the vacancy formation energy of Pd atom and thus promote the ORR stability.

【 授权许可】

CC BY