Enhancement of the performance of Pd nanoclusters confined within ultrathin silica layers for formic acid oxidation

Nanoscale
Jiefei ShanShichun Mu

Abstract

The optimized design of highly active and stable anode electrocatalysts is essential for high performance direct formic acid fuel cells (DFAFCs). Herein, a facile and cost-effective strategy was proposed to fabricate a robust ultrasmall Pd nanocluster confined within ultrathin protective silica layers anchored on nitrogen doped reduced GO (NrGO) through generating amine functionalized graphene oxide with 3-aminopropyl triethoxysilane (APTES), followed by tuning the thickness of protective silica layers by precisely controlling the amount of tetraethylorthosilicate (TEOS). Amine functionalized graphene oxide generated by using APTES favors the formation of ultrasmall Pd nanoclusters due to the coordination of amine to PdCl24- while the confinement effect of ultrathin protective silica layers stabilizes ultrasmall Pd nanoclusters and impedes the agglomeration and sintering of ultrasmall Pd nanoclusters during electrocatalysis. As a result, the ultrasmall Pd nanoclusters (∼1.4 nm) confined in silica layers on NrGO (Pd/NrGO@SiO2) demonstrate a very high forward peak current density for formic acid oxidation (FAO) of 2.37 A mg-1, outperforming the Pd/C catalyst (0.30 A mg-1) and the Pd/rGO catalyst obtained by a conventional method ...Continue Reading

References

Sep 26, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Wei ChenShaowei Chen
Mar 14, 2009·Journal of the American Chemical Society·Vismadeb Mazumder, Shouheng Sun
Apr 15, 2015·Journal of the American Chemical Society·Hetong QiLanqun Mao
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Aug 9, 2017·Accounts of Chemical Research·Zhe Gao, Yong Qin
Sep 25, 2018·Journal of the American Chemical Society·Hong Je ChoBingjun Xu

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Methods Mentioned

BETA
transmission electron microscopy
X-ray
AFM

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