Phase and Composition Tuning of 1D Platinum-Nickel Nanostructures for Highly Efficient Electrocatalysis

Kezhu Jiang¹,Qi Shao¹,Dandan Zhao¹,Lingzheng Bu¹, Jun Guo²,Xiaoqing Huang^1, *(黄小青)

¹ College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, China

² Testing & Analysis Center, Soochow University, Jiangsu, China

Adv. Funct. Mater. 2017,27, 1700830

Among various platinum (Pt)-based nanostructures, porous or hollow ones are of great importance because they exhibit fantastic oxygen reduction reaction (ORR) enhancements and maximize atomic utilization by exposing both exterior and interior surfaces. Here, a new class of porous Pt₃Ni nanowires (NWs) with 1D architecture, an ultrathin Pt-rich shell, high index facets, and a highly open structure is designed via a selective etching strategy by using the phase and composition segregated Pt-Ni NWs as the starting material. The porous feature of Pt₃Ni NWs can be readily fulfilled by changing the Pt/Ni atomic ratio of the starting Pt-Ni NWs. Such porous Pt₃Ni NWs show extraordinary activity and stability enhancements toward methanol oxidation reaction and ORR. The porous Pt₃Ni NWs can deliver ORR mass activity of 5.60 A mg⁻¹, which is 37.3-fold higher than that of the Pt/C. They also show outstanding stability with negligible activity loss after 20 000 cycles. This study offers a unique approach for the design of complex nanostructures as efficient catalysts through precisely tailoring.

链接：http://onlinelibrary.wiley.com/doi/10.1002/adfm.201700830/abstract;jsessionid=9906151C81C83D0C75C62731586432C7.f02t03