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[Advanced Materials] Prof. Xiaoqing Huang published a paper entitled "Pd-Sb Rhombohedron with Unconventional Rhombohedral Phase as Trifunctional Electrocatalyst"

Posted:2022-09-27  Visits:

Title: Pd-Sb Rhombohedron with Unconventional Rhombohedral Phase as Trifunctional Electrocatalyst

Authors: Bingyan Xu,Tianyang Liu,Xiaocong Liang,Wenjie Dou,Hongbo Geng,Zhiyang Yu,Yafei Li,Ying Zhang,Qi Shao,Jingmin Fan,Xiaoqing Huang*

Abstract: Crystal phase engineering is an important strategy for designing noble-metal-based catalysts with optimized activity and stability. From the thermodynamic point of view, it remains a great challenge to synthesize unconventional phases of noble metals. Here, a new class of Pd-based nanostructure with unconventional rhombohedral Pd20Sb7 phase has been successfully synthesized. Benefiting from the high proportion of the unique exposed Pd20Sb7 (003) surface, Pd20Sb7 rhombohedra display much enhanced ethanol oxidation reaction (EOR) and oxygen reduction reaction (ORR) performance compared with commercial Pd/C. Moreover, Pd20Sb7 rhombohedra are also demonstrated as effective air cathode in non-aqueous Li–air battery with an overpotential of only 0.24 V. Density functional theory calculations reveal that the unique exposed facets of Pd20Sb7 rhombohedra can not only reduce the excessive adsorption of CH3CO* to CH3COOH on Pd for promoting EOR process, but also weaken the CO binding and CO poisoning. This work provides a new class of unconventional intermetallic nanomaterials with enhanced electrocatalytic activity.