期刊
CARBON
卷 186, 期 -, 页码 36-45出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.10.004
关键词
Nitrogen-doped carbon layer; Large Pt particle; Encapsulated electrocatalyst; Oxygen reduction reaction; H-2-O-2 fuel cell
资金
- Science and Technology Planning Social Development Project of Zhenjiang City [GY2018002]
- China Postdoctoral Science Foundations [2018M630530, 2019T120410]
By encapsulating large Pt shell/Ni core particles with thick and porous nitrogen-doped carbon layers, excellent stability and high activity of the composite catalyst were achieved, maintaining high oxygen reduction activity value even after a large number of cyclic voltammetry cycles.
We encapsulate large Pt shell/Ni core (PtNi) particles with thick and porous nitrogen-doped carbon (N-C) layers, and demonstrate that the thick N-C layers can protect the PtNi particles from dissolution and migration for an extremely long service life through both steric hindrance and chemical bond; in addition, the well mass transfer performance of the porous N-C, the thin Pt shell, and the promotion effects of N-C and Ni on Pt lead to excellent activity of the composite catalyst (N-C/PtNi). As a result, the N-C/PtNi keeps the high oxygen reduction reaction activity value of 962-1080 mA mg(Pt)(-1) for 60,000 cyclic voltammetry (CV) cycles and still has a high activity of 265 mA mg(Pt)(-1) even after 120,000 CV cycles. Moreover, the N-C/PtNi shows a max power density of 1.24 W cm(-2) at cathodic loading of 0.1 mg(Pt) cm(-2) in H-2-O-2 fuel cell under 200 kPa absolute pressure of O-2 without performance decrease within 60,000 cycles. Other large noble metal-based particles are believed to gain ultrahigh stabilities and higher activities through performing the similar encapsulation. (C) 2021 Elsevier Ltd. All rights reserved.
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