...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions
【24h】

Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions

机译：具有超低Pt含量的Pt / C-LiCoO2复合材料作为增效双功能电催化剂，用于氧还原和放出反应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Oxygen reduction and evolution reactions (ORR and OER) are of prime importance for many energy conversion and storage devices, such as regenerative fuel cells and rechargeable metal-air batteries. However, the sluggish kinetics of the ORR and OER strongly limit the efficiency and performance of these electrochemical systems and jeopardize the route of commercialization. Therefore, the design and development of bifunctional electrocatalysts with high activity for both the ORR and OER is challenging but urgent and crucial. Here, we took advantage of Pt/C and LiCoO2 with outstanding ORR activity and high intrinsic OER activity, respectively, to develop a composite material with ultralow Pt loading as a bifunctional catalyst for the ORR and OER in alkaline media. This catalyst was fabricated via simple ultrasonic mixing, exhibiting superb electrocatalytic activity and good stability. Its ORR activity is comparable to that of the commercial Pt/C catalyst and its OER activity is better than that of single LiCoO2, owing to the synergetic effect between Pt and LiCoO2, which has been demonstrated through the X-ray photoelectron spectroscopy (XPS) characterisation technique. Remarkably, surprisingly high ORR mass activity (2.04 A mg(Pt)(-1) at 0.8 V vs. RHE) and enhanced bifunctionality (Delta E = 0.91 V) were obtained for the Pt-LiCoO2 composite catalyst with a mass ratio of 1 : 49 for Pt/LiCoO2. Our work opens up a new track to exploit highly efficient catalysts with reduced consumption of Pt, meanwhile maintaining the optimal catalytic activity and durability.
机译：氧气还原和放出反应（ORR和OER）对于许多能量转换和存储设备（例如再生燃料电池和可充电金属空气电池）至关重要。但是，ORR和OER的反应动力学缓慢，严重限制了这些电化学系统的效率和性能，并危及了商业化途径。因此，对于ORR和OER都具有高活性的双功能电催化剂的设计和开发具有挑战性，但紧迫而关键。在这里，我们分别利用具有出色ORR活性和高固有OER活性的Pt / C和LiCoO2来开发具有超低Pt负载量的复合材料，作为碱性介质中ORR和OER的双功能催化剂。该催化剂是通过简单的超声混合制备的，具有极好的电催化活性和良好的稳定性。由于X射线光电子能谱（XPS）证实了Pt和LiCoO2之间的协同作用，其ORR活性与市售Pt / C催化剂相当，并且OER活性优于单个LiCoO2。表征技术。值得注意的是，对于质量比为1的Pt-LiCoO2复合催化剂，获得了令人惊讶的高ORR质量活性（0.8 V vs. RHE时为2.04 A mg（Pt）（-1））和增强的双官能度（Delta E = 0.91 V）。 ：Pt / LiCoO2为49。我们的工作开辟了一条新途径，以利用高效的催化剂减少Pt的消耗，同时保持最佳的催化活性和耐久性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号