A Facile Synthesis of MPd (M = Co, Cu) Nanoparticles and Their Catalysis for Formic Acid Oxidation

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• 作者：Vismadeb Mazumder ; Miaofang Chi ; Max N. Mankin ; Yi Liu ; 脰nder Metin ; Daohua Sun ; Karren L. More ; Shouheng Sun
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：February 8, 2012
• 年：2012
• 卷：12
• 期：2
• 页码：1102-1106
• 全文大小：350K
• 年卷期：v.12,no.2(February 8, 2012)
• ISSN：1530-6992

文摘

Monodisperse CoPd nanoparticles (NPs) were synthesized and studied for catalytic formic acid (HCOOH) oxidation (FAO). The NPs were prepared by coreduction of Co(acac)₂ (acac = acetylacetonate) and PdBr₂ at 260 掳C in oleylamine and trioctylphosphine, and their sizes (5鈥?2 nm) and compositions (Co₁₀Pd₉₀ to Co₆₀Pd₄₀) were controlled by heating ramp rate, metal salt concentration, or metal molar ratios. The 8 nm CoPd NPs were activated for HCOOH oxidation by a simple ethanol wash. In 0.1 M HClO₄ and 2 M HCOOH solution, their catalytic activities followed the trend of Co₅₀Pd₅₀ > Co₆₀Pd₄₀ > Co₁₀Pd₉₀ > Pd. The Co₅₀Pd₅₀ NPs had an oxidation peak at 0.4 V with a peak current density of 774 A/g_Pd. As a comparison, commercial Pd catalysts showed an oxidation peak at 0.75 V with peak current density of only 254 A/g_Pd. The synthesis procedure could also be extended to prepare CuPd NPs when Co(acac)₂ was replaced by Cu(ac)₂ (ac = acetate) in an otherwise identical condition. The CuPd NPs were less active catalysts than CoPd or even Pd for FAO in HClO₄ solution. The synthesis provides a general approach to Pd-based bimetallic NPs and will enable further investigation of Pd-based alloy NPs for electro-oxidation and other catalytic reactions.

Keywords:

Bimetallic nanoparticles; Pd-based nanoparticles; size and composition control; formic acid oxidation; catalysis