铂钯铜纳米枝晶通过增强碳 - 碳键断裂实现乙醇的完全氧化。
PtPdCu nanodendrites enable complete ethanol oxidation by enhancing CC bond cleavage.
作者信息
Wang Fei, Wang Kaili, An Chao, An Changhua, Zhang Weiqing
机构信息
Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China; School of Materials Science and Engineering, China University of Petroleum, 266580 Qingdao, China.
出版信息
J Colloid Interface Sci. 2020 Jul 1;571:118-125. doi: 10.1016/j.jcis.2020.03.039. Epub 2020 Mar 10.
Complete oxidation of ethanol is a pressing need for direct ethanol fuel cells (DEFCs) owning to high energy conversion. However, it holds great challenges on account of sluggish kinetics for CC bond cleavage and high susceptibility to CO poisoning. Herein, ternary PtPdCu nanocrsytals are synthesized and investigated for complete oxidation of ethanol. The obtained ternary PtPdCu nanodendrites (PtPdCu NDs) have a stepped surface, providing abundant active sites. Due to the structural and synergistic effects, ternary PtPdCu NDs exhibit a mass activity of 5.59 A mg and specific activity of 15.82 mA cm towards ethanol oxidation reaction, which are 6.4 and 3.6 times larger than that of commercial Pt/C. Further studies reveal that ternary PtPdCu NDs show strong abilities of CO anti-poisoning and CC bond cleavage, enhancing the C pathway selectivity.
由于具有高能量转换效率，乙醇的完全氧化对于直接乙醇燃料电池（DEFCs）而言是迫切需求。然而，由于C-C键裂解动力学缓慢以及对CO中毒高度敏感，这带来了巨大挑战。在此，合成了三元PtPdCu纳米晶体并对其用于乙醇的完全氧化进行了研究。所制备的三元PtPdCu纳米树枝晶（PtPdCu NDs）具有阶梯状表面，提供了丰富的活性位点。由于结构和协同效应，三元PtPdCu NDs对乙醇氧化反应表现出5.59 A mg的质量活性和15.82 mA cm的比活性，分别是商业Pt/C的6.4倍和3.6倍。进一步研究表明，三元PtPdCu NDs表现出很强的抗CO中毒和C-C键裂解能力，提高了C途径选择性。
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