当前位置: X-MOL 学术Adv. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Pd–Sb Rhombohedra with an Unconventional Rhombohedral Phase as a Trifunctional Electrocatalyst
Advanced Materials ( IF 27.4 ) Pub Date : 2022-09-19 , DOI: 10.1002/adma.202206528
Bingyan Xu 1 , Tianyang Liu 2 , Xiaocong Liang 3 , Wenjie Dou 1 , Hongbo Geng 4 , Zhiyang Yu 3 , Yafei Li 2 , Ying Zhang 5 , Qi Shao 6 , Jingmin Fan 1 , Xiaoqing Huang 1
Affiliation  

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 is 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 performance compared with commercial Pd/C. Moreover, Pd20Sb7 rhombohedra are also demonstrated as an effective air cathode in non-aqueous Li–air batteries 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 CO binding and CO poisoning. This work provides a new class of unconventional intermetallic nanomaterials with enhanced electrocatalytic activity.

中文翻译:

具有非常规菱面体相的 Pd-Sb 菱面体作为三功能电催化剂

晶相工程是设计具有最佳活性和稳定性的贵金属基催化剂的重要策略。从热力学的角度来看,合成贵金属的非常规相仍然是一个巨大的挑战。在这里,成功合成了一类具有非常规菱面体 Pd 20 Sb 7相的新型 Pd 基纳米结构。受益于独特的高比例暴露 Pd 20 Sb 7 (003) 表面,与商业 Pd/C 相比,Pd 20 Sb 7菱面体显示出大大增强的乙醇氧化反应 (EOR) 和氧还原反应性能。此外, Pd 20 Sb 7菱形也被证明是非水系锂空气电池中的有效空气阴极,过电位仅为 0.24 V。密度泛函理论计算表明,Pd 20 Sb 7菱形独特的暴露面不仅可以减少 CH 的过度吸附Pd 上的3 CO* 转化为 CH 3 COOH 促进 EOR 过程,但也削弱 CO 结合和 CO 中毒。这项工作提供了一类具有增强电催化活性的新型非常规金属间化合物纳米材料。
更新日期:2022-09-19
down
wechat
bug