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首页> 外文期刊>RSC Advances >LaNiO3-nanorod/graphene composite as an efficient bi-functional catalyst for zinc-air batteries
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LaNiO3-nanorod/graphene composite as an efficient bi-functional catalyst for zinc-air batteries

机译：Lanio3-纳米棒/石墨烯复合材料作为锌 - 空气电池的有效双官能催化剂

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摘要

Developing low-cost catalysts for high-performance oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly desirable. Herein, LaNiO3 nanorods supported on reduced graphene oxide (LNO-NR/RGO) were synthesized via a hydrothermal method, and characterized by XRD, SEM, TEM, XPS, TG and BET. The results show that the LaNiO3 nanorods have a perovskite structure and good dispersion behavior on the RGO sheets. The catalytic activity of the composite for ORR and OER has been studied by using a rotating disk electrode (RDE) technique. LNO-NR/RGO shows better oxygen electrode potential, a maximum cathodic current density of -4.26 mA cm(-2) at 1600 rpm was obtained, and the ORR mainly favors a direct four electron pathway. Compared with pure LaNiO3 nanorods and commercial Pt/C, LNO-NR/RGO is more active for OER, a lower onset potential for OER and a bigger anodic current at the same applied potential are observed. The cycle performance and the stabilities of LNO-NR/RGO toward charge/discharge are significantly higher than those of commercial Pt/C in zinc-air batteries. Such excellent catalytic activity is attributed to the synergistic effect between LNO-NR and RGO along with the 1D conduction in the composite.
机译：高效地开发用于高性能氧还原反应（ORR）和氧气进化反应（OER）的低成本催化剂是非常理想的。这里，通过水热法合成支持的石墨烯氧化物（LNO-NR / RGO）的LANIO3纳米棒，其特征在于XRD，SEM，TEM，XPS，TG和BET。结果表明，Lanio3纳米棒在RGO板上具有钙钛矿结构和良好的分散行为。通过使用旋转盘电极（RDE）技术研究了ORR和OER的复合材料的催化活性。 LNO-NR / RGO显示出更好的氧电极电位，获得1600rpm的最大阴极电流密度为-4.26mAcm（-2），并且ORR主要有利于直接的四个电子通路。与纯LANIO3纳米棒和商业PT / C相比，LNO-NR / RGO对于OER更有活性，观察到OER的较低发作电位和相同应用电位处的更大阳极电流。 LNO-NR / RGO对充电/放电的循环性能和稳定性显着高于锌 - 空气电池中的商业PT / C。这种优异的催化活性归因于LNO-NR和RGO之间的协同效应以及复合材料中的1D传导。

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  • 来源
    《RSC Advances》 |2016年第89期|共9页
  • 作者

    Hu Jie; Liu Qiunan; Shi Ziwei; Zhang Liang; Huang Hao;

  • 作者单位

    Yanshan Univ State Key Lab Metastable Mat Sci &

    Technol Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Dept Environm &

    Chem Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Dept Environm &

    Chem Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Dept Environm &

    Chem Hebei Key Lab Appl Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci &

    Technol Qinhuangdao 066004 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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