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Influence of Ag nanoparticles on state of the art MnO2 nanorods performance as an electrocatalyst for lithium air batteries
International Journal of Hydrogen Energy ( IF 7.2 ) Pub Date : 2018-01-04 , DOI: 10.1016/j.ijhydene.2017.12.083
Zahoor Awan , Zafar Khan Ghouri , Saud Hashmi

The need for an alternative and efficient electrocatalyst to replace Pt-based noble materials is a goal of prime importance in Li– air battery technology. In this work, novel silver nanoparticles-incorporated MnO2 nanorods as an air electrode bifunctional catalyst have been synthesized by a simple polyol method. The physical characteristics of the thus prepared materials are analyzed by X-ray diffraction (XRD), SEM, and Brunauer–Emmett–Teller (BET) techniques. These analyses confirmed the successful synthesis of 20 to 25 nm-sized different weight % Ag nanoparticles incorporated on α-MnO2 nanorods. Linear sweeping voltammetric results of AgMnO2 showed improved ORR performance as compared to α- MnO2 nanorods in terms of the onset potential, half wave potential and limiting current. The addition of catalysts has significantly increased the discharge capacity and overall performance of the cells. The first discharge curve of 5 wt% Ag MnO2 sample reached a maximum capacity of 3500 mAhg-1 at 2.0 V with a current density of 0.1 mA cm−2 with a plateau between 2.7 and 2.6 V. Long term stability of increasing weight percentage of Ag nanoparticles on MnO2 samples is increased.



中文翻译:

Ag纳米颗粒对MnO 2纳米棒作为锂空气电池电催化剂的现有技术性能的影响

在锂空气电池技术中,最重要的目标是需要一种替代高效的电催化剂来代替基于Pt的贵金属。在这项工作中,已经通过简单的多元醇方法合成了新型的掺入银纳米颗粒的MnO 2纳米棒作为空气电极双功能催化剂。通过X射线衍射(XRD),SEM和Brunauer-Emmett-Teller(BET)技术分析了由此制备的材料的物理特性。这些分析证实了α-MnO的方式并入20至25 nm尺寸的不同重量%的Ag纳米颗粒的成功合成2纳米棒。Ag MnO 2的线性扫描伏安法结果显示,与α-MnO 2相比,ORR性能提高纳米棒的起始电势,半波电势和极限电流。催化剂的添加显着提高了电池的放电容量和整体性能。5 wt%Ag MnO 2样品的第一条放电曲线在2.0 V时达到最大容量3500 mAhg-1,电流密度为0.1 mA cm -2,稳定在2.7至2.6 V之间。重量百分比增加的长期稳定性Ag纳米颗粒在MnO 2样品上的含量增加。

更新日期:2018-01-04
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