Pd-Sb/C复合纳米催化剂对甲酸电催化氧化的性能研究

CORC > 厦门大学 > 2015年第21卷

	Pd-Sb/C复合纳米催化剂对甲酸电催化氧化的性能研究; Preparation and Characterization of Carbon Supported Pd-Sb Composite Nanocatalysts for Formic Acid Electrooxidation
	王龙龙 ; 曹晓璐 ; 王亚骏 ; 平金豪 ; 李巧霞 ; WANG Long-long ; CAO Xiao-lu ; WANG Ya-jun ; PING Jin-hao ; LI Qiao-xia
刊名	http://electrochem.xmu.edu.cn/CN/abstract/abstract10178.shtml
	2015-08-28
关键词	Pd基催化剂 Sb修饰甲酸电氧化浸渍还原法 palladium-based catalyst antimony decoration formic acid electrooxidation impregnation reduction
英文摘要	以柠檬酸三钠为稳定剂，硼氢化钠为还原剂，制备了碳载型的Pd-Sb复合纳米催化剂（Pd-Sb/C），通过调制不同Pd:Sb摩尔比研究了其对甲酸电催化性能的影响. TEM结果表明，合成的纳米颗粒粒径较小且均匀分散在碳载体表面. XRD和XPS测试表明，Pd-Sb/C中少量的单质态Sb(0)高度分散在Pd颗粒中或表面，形成合金化程度较低的PdSb合金. 电化学测试表明，当Pd:Sb = 20:1时，合成的催化剂对甲酸的催化效能最佳. 与合成的Pd/C和商业Pd/C相比，Pd-Sb/C(20:1)的电流密度分别是Pd/C的2.6倍、商业Pd/C的4.2倍. Pd-Sb/C的整体催化性能得到改善主要归因于适量的单质态Sb(0)引入到Pd中，诱导产生电子效应和“双功能”效应，一方面减小Pd与CO毒性物种之间的吸附作用，另一方面促使Pd表面吸附的CO快速氧化，提高了Pd-Sb/C催化剂的抗CO中毒能力，使得Pd-Sb/C催化剂的整体催化性能得到改善.; Palladium is considered as an efficient anode catalyst with high catalytic activity for electrooxidation of formic acid. To further improve the catalytic activity and stability, alloying or surface modification with Sb is an effective way. In this work, the well dispersed carbon supported Pd-Sb composite nanocatalysts (Pd-Sb/C) were synthesized by traditional impregnation reduction method with trisodium citrate as the complexing agent, sodium borohydride as the reducing agent. The morphologies of Pd-Sb/C and the effects of molar ratio of Pd to Sb on the electrocatalytic properties of Pd-Sb/C for HCOOH electrooxidation were studied. The XRD and XPS analyses on the as-prepared Pd-Sb/C catalyst revealed that Sb (0) was presented on the Pd surface, and the immature alloying of Pd with Sb was achieved. Cyclic voltammetryic and chronoamperometric studies indicated a volcano-shaped relationship between Sb content and electrocatalytic activity with an optimum molar ratio of Pd:Sb=20:1. Compared with the commercial Pd/C catalyst, the Pd-Sb/C (20:1) presented the highest electrocatalytic activity and best stability. This enhancement may be attributed to the electronic effect and bi-functional effect induced by addition of Sb onto Pd surface, resulting in a weaker adsorption and accelerated oxidative removal of CO poison formed during HCOOH electrooxidation.; 国家自然科学基金项目（No. 21103107）、上海市科委重点项目（No. 10160502300）资助; 作者联系地址：上海电力学院，上海高校电力腐蚀控制与应用电化学重点实验室，上海 200090; Author's Address: Key Laboratory of Shanghai Colleges and Universities for Corrosion Control in Electric Power System and Applied Electrochemistry, Shanghai University of Electric Power, Shanghai 200090, China; 通讯作者E-mail：liqiaoxia@shiep.edu.cn
语种	中文
出版者	厦门大学《电化学》编辑部
内容类型	期刊论文
源URL	[http://dx.doi.org/10.13208/j.electrochem.141124]
专题	2015年第21卷
推荐引用方式 GB/T 7714	王龙龙,曹晓璐,王亚骏,等. Pd-Sb/C复合纳米催化剂对甲酸电催化氧化的性能研究, Preparation and Characterization of Carbon Supported Pd-Sb Composite Nanocatalysts for Formic Acid Electrooxidation[J]. http://electrochem.xmu.edu.cn/CN/abstract/abstract10178.shtml,2015.
APA	王龙龙.,曹晓璐.,王亚骏.,平金豪.,李巧霞.,...&LI Qiao-xia.(2015).Pd-Sb/C复合纳米催化剂对甲酸电催化氧化的性能研究.http://electrochem.xmu.edu.cn/CN/abstract/abstract10178.shtml.
MLA	王龙龙,et al."Pd-Sb/C复合纳米催化剂对甲酸电催化氧化的性能研究".http://electrochem.xmu.edu.cn/CN/abstract/abstract10178.shtml (2015).