期刊
DALTON TRANSACTIONS
卷 48, 期 3, 页码 1084-1094出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt04610g
关键词
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资金
- National Natural Science Foundation of China [21505050, 51672109]
- Natural Science Foundation of Shandong Province [ZR2016FM30]
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA)
- JSPS KAKENNHI [15H03534, 15K13296, 18H03869]
Metallic Ag-0 intercalated CoAl-layered double hydroxides (CoAl LDHs) have been successfully synthesized in situ through a simple redox process with ethylene glycol (EG) and triethanolamine (TEOA). The Ag(CN)(2)(-) anion-exchanged precursor was reduced by EG to form metallic Ag-0. Furthermore, the effect of TEOA on confining the particle size of Ag-0 was demonstrated. The oxygen reduction reaction (ORR) property of metallic Ag-0 intercalated CoAl LDHs was examined in alkaline aqueous solution. A typical sample synthesized by the addition of TEOA for 180 min exhibited excellent ORR catalytic activity with a high current density of 5.5 mA cm(-2) at 0.2 V (vs. a reversible hydrogen electrode (RHE)) and good stability. Koutecky-Levich (K-L) calculations and rotating ring-disk electrode (RRDE) measurements further revealed that the ORR of the as-prepared catalyst proceeded mainly via an almost ideal four-electron transfer process. The enhanced electrocatalytic activity was ascribed to the intercalated Ag-0, confined nanoparticle size and the expanded interlayer space, which effectively facilitate the reactant transfer and electron migration.
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