催化作用
化学
八面体
浸出(土壤学)
醋酸
纳米晶
氧气
化学工程
氧还原
还原剂
材料科学
组合化学
纳米技术
结晶学
晶体结构
物理化学
有机化学
电化学
电极
土壤水分
土壤科学
工程类
环境科学
作者
Yafeng Zhang,Kai Yang,Qianru Liu,Juan Qin,Qike Jiang,Bing Yang,Feng Yin
标识
DOI:10.1002/advs.202104927
摘要
Structure-controlled Pt-based nanocrystals have the great potential to provide a flexible strategy for improving the catalysis of the oxygen reduction reaction (ORR). Here, a new synthetic approach is developed to tune the 3D structure of Pt-based alloys, and switch a synthetic reaction which produces solid PtCu octahedral stars (OSs) to produce PtCu nested skeleton cubes (NSCs) by simple addition of Ni(acac)2 . In particular, Ni2+ -guided anisotropic growth is observed to generate the nested skeleton structure in PtCu NSCs. Ni2+ , though absent from the nanoalloys, not only endows faster Cu reduction kinetics but also acts as a structure-directing agent. Moreover, it is shown that acetic acid treatment of PtCu NSCs/C exposes Pt-rich surface with a fine-tuned Pt d-band center energy and the reduced Cu leaching, resulting in strikingly high activity and stability. Acid-treated PtCu NSCs/C shows a remarkable ORR mass activity of 5.13 A mgPt-1 , about 26 times higher than commercial Pt/C catalyst. This catalyst also exhibits excellent stability with a lower activity decay of 11.5% and the negligible variation in structure after 10 000 cycles.
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