Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
A Phosphorus‐Doped Ag@Pd Catalyst for Enhanced C?C Bond Cleavage during Ethanol Electrooxidation
Small ( IF 13.0 ) Pub Date : 2020-11-02 , DOI: 10.1002/smll.202004727 Xiaobo Yang 1, 2 , Zaipeng Liang 1, 2 , Shuai Chen 1 , Minjun Ma 1, 2 , Qiang Wang 1 , Xili Tong 1 , Qinghua Zhang 3 , Jinyu Ye 4 , Lin Gu 3, 5, 6 , Nianjun Yang 7
Small ( IF 13.0 ) Pub Date : 2020-11-02 , DOI: 10.1002/smll.202004727 Xiaobo Yang 1, 2 , Zaipeng Liang 1, 2 , Shuai Chen 1 , Minjun Ma 1, 2 , Qiang Wang 1 , Xili Tong 1 , Qinghua Zhang 3 , Jinyu Ye 4 , Lin Gu 3, 5, 6 , Nianjun Yang 7
Affiliation
|
Ethanol is preferred to be oxidized into CO2 for the construction of a high‐performance direct ethanol fuel cell since this complete ethanol oxidation reaction (EOR) transfers 12 electrons. However, this EOR is sluggish and has the low activity as well as poor selectivity. To promote such a favorable EOR, more exactly the cleavage selectivity of CC bonds in ethanol, phosphorus‐doped silver‐core‐and‐Pd‐shell catalysts (denoted as Ag@PdP) are designed and synthesized. In the alkaline media, a Ag@Pd2P0.2 catalyst is superior toward EOR into CO2. It exhibits seven times higher mass activity and six times higher selectivity than the benchmark Pd/C catalyst. As confirmed by means of density functional theory calculation and in situ Fourier‐transform infrared spectroscopy, such high performance stems from an increased adsorption energy of OH radicals on the Pd active sites. Meanwhile, the tensile strain effect of a core–shell structure of this Ag@Pd2P0.2 catalyst favors the formation of adsorbed CH3CO intermediate, the key species for the enhanced C–C cleavage into CO2, instead of acetate. The proposed way to design and synthesize such high‐performance EOR catalysts will explore the practical applications of direct alkaline ethanol fuel cells.
中文翻译：
磷掺杂银@ Pd催化剂增强Ç ？乙醇电氧化过程中的C键裂解
乙醇优选被氧化成CO 2以构建高性能的直接乙醇燃料电池，因为这种完全的乙醇氧化反应（EOR）可以转移12个电子。但是，该EOR反应迟钝，活性低且选择性差。为了促进这样的有利EOR，更准确地C的切割的选择性方面在乙醇C键，磷-掺杂银的核心-钯-壳催化剂（表示为银@ PDP）的设计和合成。在碱性介质中，Ag @ Pd 2 P 0.2催化剂在EOR转化为CO 2方面表现优异。它具有比基准Pd / C催化剂高7倍的质量活性和6倍的选择性。正如通过密度泛函理论计算和原位傅立叶变换红外光谱法所证实的那样，如此高的性能源于OH自由基在Pd活性位点上的吸附能增加。同时，这种Ag @ Pd 2 P 0.2催化剂的核-壳结构的拉伸应变效应有利于形成吸附的CH 3 CO中间体，CH 3 CO中间体是增强CC裂解为CO 2而不是乙酸的关键物质。设计和合成这种高性能EOR催化剂的拟议方法将探索直接碱性乙醇燃料电池的实际应用。
更新日期：2020-11-27
中文翻译：
磷掺杂银@ Pd催化剂增强Ç ？乙醇电氧化过程中的C键裂解
乙醇优选被氧化成CO 2以构建高性能的直接乙醇燃料电池，因为这种完全的乙醇氧化反应（EOR）可以转移12个电子。但是，该EOR反应迟钝，活性低且选择性差。为了促进这样的有利EOR，更准确地C的切割的选择性方面在乙醇C键，磷-掺杂银的核心-钯-壳催化剂（表示为银@ PDP）的设计和合成。在碱性介质中，Ag @ Pd 2 P 0.2催化剂在EOR转化为CO 2方面表现优异。它具有比基准Pd / C催化剂高7倍的质量活性和6倍的选择性。正如通过密度泛函理论计算和原位傅立叶变换红外光谱法所证实的那样，如此高的性能源于OH自由基在Pd活性位点上的吸附能增加。同时，这种Ag @ Pd 2 P 0.2催化剂的核-壳结构的拉伸应变效应有利于形成吸附的CH 3 CO中间体，CH 3 CO中间体是增强CC裂解为CO 2而不是乙酸的关键物质。设计和合成这种高性能EOR催化剂的拟议方法将探索直接碱性乙醇燃料电池的实际应用。
京公网安备 11010802027423号