Investigation of Transition Metal-Based (Mn, Co, Ni, Fe) Trimetallic Oxide Nanoparticles on N-doped Carbon Nanotubes as Bifunctional Catalysts for Zn-Air Batteries
Investigation of Transition Metal-Based (Mn, Co, Ni, Fe) Trimetallic Oxide Nanoparticles on N-doped Carbon Nanotubes as Bifunctional Catalysts for Zn-Air Batteries
复制标题
DOI：
10.1149/1945-7111/ab7094
复制
发表时间：
2020-02-11
影响因子：
3.9
通讯作者：
Ivey, Douglas G.
中科院分区：
文献类型：
--
作者：
Aasen, Drew;Clark, Michael P.;Ivey, Douglas G.
采用一锅法在碳纳米管上成功地合成了多种过渡金属基的双金属氧化物和三金属氧化物。多孔气体扩散层（GDL）的同时浸渍的催化剂在合成过程中，导致在一个有效的和可扩展的纳米复合材料空气电极的制备技术。基于电池倍率测试结果，NiMnOx/N-CNT、NiFeOx/N-CNT和（Co，Fe）（3）O-4/N-CNT催化剂是性能最高的氧化物。因此，Ni-Co-Fe、Ni-Mn-Fe和Mn-Co-Fe系统被研究作为用于锌空气电池的组合的三金属氧化物/N-CNT催化剂。在线性扫描伏安法（LSV）测试中，N-CNT上的三金属氧化物表现出改善的OER活性和与N-CNT氧化物催化剂相当的ORR活性。在20 mA cm（-2）的电流密度下，从电池速率测试测量计算的N-CNT上的三金属氧化物的放电/充电效率对于NCFO/N-CNT、NMFO/N-CNT和MCFO/N-CNT分别为60.5%、60.7%和60.0%。所有三金属氧化物/N-CNT电极在10 mA cm（-2）下的双功能循环100 h显示出优异的稳定性，特别是NCFO/N-CNT催化剂。此外，NCFO/N-CNT、NMFO/N-CNT和MCFO/N-CNT样品在循环后的效率分别为58.5%、57.9%和57.2%，与Pt-Ru/C（55.3%）相比是有利的。因此，N-CNT上的三金属氧化物是作为锌空气电池的高性能非贵金属催化剂的优异候选物。(C)2020年电化学学会（“ECS”）。由IOP出版有限公司代表ECS出版。
Various transition metal-based bimetallic and trimetallic oxides on N-CNTs were successfully synthesized in a one-pot process. Porous gas diffusion layers (GDLs) were simultaneously impregnated with the catalysts during synthesis, resulting in an efficient and scalable preparation technique for nano-composite air electrodes. NiMnOx/N-CNT, NiFeOx/N-CNT, and (Co,Fe)(3)O-4/N-CNT catalysts were the highest performing bimetallic oxides based on battery rate test results. Therefore, Ni-Co-Fe, Ni-Mn-Fe, and Mn-Co-Fe systems were investigated as combined trimetallic oxide/N-CNT catalysts for Zn-air batteries. Trimetallic oxides on N-CNTs exhibited improved OER activity and comparable ORR activity relative to the bimetallic oxide catalysts in linear sweep voltammetry (LSV) tests. Discharge/charge efficiencies for tri-metallic oxides on N-CNTs calculated from battery rate test measurements at a current density of 20 mA cm(-2) were 60.5%, 60.7%, and 60.0% for NCFO/N-CNT, NMFO/N-CNTs and MCFO/N-CNT, respectively. Bifunctional cycling of all trimetallic oxide/N-CNT electrodes at 10 mA cm(-2) for 100 h showed excellent stability, particularly the NCFO/N-CNT catalyst. Additionally, the efficiencies for NCFO/N-CNT, NMFO/N-CNT and MCFO/N-CNT samples were 58.5%, 57.9% and 57.2%, respectively, after cycling, which compare favorably with that of Pt-Ru/C (55.3%). Trimetallic oxides on N-CNTs are, therefore, excellent candidates as high performing, non-precious metal catalysts for Zn-air batteries. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.