摘要
The regulation of interface electron-transfer and catalytic kinetics is very important to design the efficient electrocatalyst for alkaline hydrogen oxidation reaction(HOR).Here,we show the Pt-Ni alloy nanoparticles(PtNi_(2))have an enhanced HOR activity compared with single component Pt catalyst.While,the interface electron-transfer kinetics of PtNi_(2)catalyst exhibits a very wide electron-transfer speed distribution.When combined with carbon dots(CDs),the interface charge transfer of PtNi_(2)-CDs composite is optimized,and then the PtNi_(2)-5 mg CDs exhibits about 2.67 times and 4.04 times higher mass and specific activity in 0.1 M KOH than that of 20%commercial Pt/C.In this system,CDs also contribute to trapping H^(+)and H_(2)O generated during HOR,tuning hydrogen binding energy(HBE),and regulating interface electron transfer.This work provides a deep understanding of the interface catalytic kinetics of Pt-based alloys towards highly efficient HOR catalysts design.
基金
supported by the National Key R&D Program of China(2020YFA0406104,2020YFA0406101)
the National MCF Energy R&D Program of China(2018YFE0306105)
the Innovative Research Group Project of the National Natural Science Foundation of China(51821002)
the National Natural Science Foundation of China(51725204,21771132,51972216,52041202)
the Natural Science Foundation of Jiangsu Province(BK20190041)
the Key-Area Research and Development Program of Guang Dong Province(2019B010933001)
the Collaborative Innovation Center of Suzhou Nano Science&Technology
the 111 Project。
