Highly active N-doped carbon encapsulated Pd-Fe intermetallic nanoparticles for the oxygen reduction

来源 :纳米研究(英文版) | 被引量 : 0次 | 上传用户:yesyouok
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Developing highly efficient non-Pt catalysts for fuel cells and metal-air batteries is highly desirable but still challenging due to the sluggish oxygen reduction reaction (ORR).Herein,a facile and efficient strategy is demonstrated to prepare N-doped carbon encapsulated ordered Pd-Fe intermetallic (O-Pd-Fe@NC/C) nanoparticles via a one-step thermal annealing method.The obtained O-Pd-Fe@NC/C nanoparticles show enhanced ORR activity,durability and anti-poisoning capacity in both acid and alkaline medium.When O-Pd-Fe@NC/C serving as cathode catalyst for Zn-air battery,it exhibits higher voltage platform and superior cycling performance with respect to the Zn-air battery based on the mixture of Pt/C and Ir/C catalysts.The enhanced electrocatalytic performance can be ascribed to the formation of face-centered tetragonal (fct) Pd-Fe nanoparticles,the protective action of the N-doped carbon layer and the interface confinement effect between them.The in situ formed N-doped carbon shell not only restrains the Pd-Fe ordered intermetallics from aggregating effectively during the thermal annealing process,but also provides a strong anchoring effect to avoid the detachment of Pd-Fe nanoparticles from the carbon support during the potential cycling.This facile carbon encapsulation strategy may also be extended to the preparation of a wide variety of N-doped carbon encapsulated intermetallic compounds for fuel cell application.
其他文献
在全球化的背景下,国家间的产业价值链逐渐形成.因而,在测算绿地投资等跨国直接投资行为的经济影响时,仅考察宏观的影响是远远不够的,而更需要从产业链层面进行分析.本文试图
A highly versatile seed-mediated approach for the synthesis of citrate-stabilized gold,silver and palladium nanoparticles (NPs) with size control is reported.Th
代际流动性是经济增长的重要因素.本文通过构建一般均衡理论模型考察了融资约束对代际流动性的影响.研究发现,融资约束降低了代际流动性.家庭面临的融资约束越强,投入的教育
近年来,随着我国经济的快速发展,人们对于能源的使用需求越来越多,能源匮乏现已经成为了社会发展的核心问题之一,而且在能源消耗方面建筑业占有着较大比例,所以,有效降低建筑
我国科技发展已经进入到了一个新的阶段,在这样的时代背景之下,煤矿工程行业发展速度不断加快,这与采矿技术的创新有直接关系.对于煤矿工程来说,在实际运转的过程中会涉及到
高氧血症在急危重症患者救治过程中发生率高,会对患者造成高氧相关性病理损伤,因此,亟需完善急危重症患者氧疗管理.本文综述急危重症患者中高氧血症的发生现状及管理策略,旨
目的: 通过前瞻性地研究在冲击波治疗肾结石中应用L-精氨酸对冲击波致肾损伤的保护性影响,并进行对比分析,以便为临床治疗提供科学依据。 材料与方法: 健康雄性家兔25
2012年以来,自治区地矿局党委以“基层组织建设年”为契机,按照抓党建就是管思想、把方向、聚合力、促地勘的思路,以项目部标准化建设为载体,找准党建与地勘的结合点,不断深
患者为老年女性,以发热21天为主诉就诊,外院尿培养提示泌尿系统感染,既往糖尿病病史,规律服用二甲双胍,入院后给予抗感染及对症治疗,但来诊后血气分析提示持续高乳酸血症,给