Manipulation of Neighboring Palladium and Mercury Atoms for Efficient *OH Transformation in Anodic Alcohol Oxidation and Cathodic Oxygen Reduction Reactions
文献类型:期刊论文
作者 | Ji, Qinghua![]() ![]() |
刊名 | ACS APPLIED MATERIALS & INTERFACES
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出版日期 | 2020-03-18 |
卷号 | 12期号:11页码:12677-12685 |
关键词 | PdHg ordered intermetallic alloy synergetic effect alcohol oxidation reaction oxygen reduction reaction fuel cells |
ISSN号 | 1944-8244 |
英文摘要 | The synergetic effect of neighboring heterogeneous atoms is capable of enabling unexpected catalytic performance, and the design of a well-ordered atomic structure and elaborating the underlying interactions are crucial for the development of superior electrocatalysts in fuel cells. We demonstrate here that an ordered Pd-Hg intermetallic alloy with dimensions of several nanometers can be subtly manipulated using a mild wet-chemical reduction approach. On the basis of combined results of XPS and HAADF-STEM analysis, the adjacent regions of metallic atoms were found to be evenly occupied by heterogeneous elements from the distribution features of the surface structure. Due to charge transfer from Hg to neighboring Pd, the down-shift of the d-band center in PdHg alloys was theoretically beneficial for desorption of crucial intermediates (*OH), both in anodic ethanol oxidation reaction (EOR) and in cathodic oxygen reduction reaction (ORR). In the presence of Hg atoms with lower *OH desorption energy, the rapid dissociation of *OH from Pd facilitated the final H2O formation, with superior ORR efficiency comparable to Pt/C catalysts. Remarkably, the rapid combination of *OH on Hg atoms with CH3CO* on neighboring Pd atoms unambiguously favored generation of acetate ions (rate-determining) in the catalytic EOR process, resulting in a high mass activity (7.68 A per mgPd). This well-ordered atomic structure also shows excellent long-term stability in ethylene glycol oxidation reaction and ORR. |
源URL | [http://ir.rcees.ac.cn/handle/311016/45322] ![]() |
专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
推荐引用方式 GB/T 7714 | Ji, Qinghua,Zhou, Yujun,Xiang, Chao,et al. Manipulation of Neighboring Palladium and Mercury Atoms for Efficient *OH Transformation in Anodic Alcohol Oxidation and Cathodic Oxygen Reduction Reactions[J]. ACS APPLIED MATERIALS & INTERFACES,2020,12(11):12677-12685. |
APA | Ji, Qinghua.,Zhou, Yujun.,Xiang, Chao.,Zhang, Gong.,Li, Jinghong.,...&Qu, Jiuhui.(2020).Manipulation of Neighboring Palladium and Mercury Atoms for Efficient *OH Transformation in Anodic Alcohol Oxidation and Cathodic Oxygen Reduction Reactions.ACS APPLIED MATERIALS & INTERFACES,12(11),12677-12685. |
MLA | Ji, Qinghua,et al."Manipulation of Neighboring Palladium and Mercury Atoms for Efficient *OH Transformation in Anodic Alcohol Oxidation and Cathodic Oxygen Reduction Reactions".ACS APPLIED MATERIALS & INTERFACES 12.11(2020):12677-12685. |
入库方式: OAI收割
来源:生态环境研究中心
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