Abstract
Designof the high-efficiency multifunctional electrocatalysts is highly demanded for many electrochemical energy devices, such as water electrolyzers, metal-air batteries and fuel cells. Here, Rh–Sn bimetallic nanocrystal catalysts supported on single-walled carbon nanotubes (RhxSny/SWNTs) are reported, and the Rh1Sn2/SWNTs electrocatalyst show best multifunctional electrocatalytic performance. Strong electron synergy between Rh and Sn is the source of high catalytic activity.Sn transfers electrons from Rh to Sn, forming a unique positive environment around Rh, which effectively optimizes the binding energy of the reaction intermediate and further improves the catalytic activity. An alkaline electrolyzer using Rh1Sn2/SWNTs catalyst demands an ultra-low cell voltage of 1.56 V at the current density of 10 mA cm−2 for overall water splitting. In addition, Rh1Sn2/SWNTs demonstrates good oxygen reduction reaction (ORR) performance, making it an excellent catalyst for long-life Zn-air batteries. This work provides a facile strategy for the development of multifunctional electrocatalysts for the highly demanded electrochemical energy technologies.
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