Coupling cobalt-iron bimetallic nitrides and N-doped multi-walled carbon nanotubes as high-performance bifunctional catalysts for oxygen evolution and reduction reaction
Coupling cobalt-iron bimetallic nitrides and N-doped multi-walled carbon nanotubes as high-performance bifunctional catalysts for oxygen evolution and reduction reaction
复制标题
钴铁双金属氮化物与氮掺杂多壁碳纳米管偶联作为析氧和还原反应的高性能双功能催化剂
DOI：
10.1016/j.electacta.2017.07.172
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发表时间：
2017-12-20
影响因子：
6.6
通讯作者：
Xiao, Dan
中科院分区：
文献类型：
--
作者：
Gao, Taotao;Jin, Zhaoyu;Xiao, Dan
锌空气电池作为一种理想的能量转换和储存装置，一直受到昂贵且不理想的空气电极材料的限制。将优秀的析氧反应（OER）活性中心（Co-Fe氮化物衍生的氧化物）和上级氧还原反应（ORR）活性中心（金属-N-C和石墨态N）偶联得到高性能、低成本的催化剂是一种理想的解决方案。在此，我们已经成功地将钴-铁氮化物与N掺杂的多壁碳纳米管（Co-Fe-N@MWCNT）结合作为稳健的双功能材料。得益于Co、Fe和MWCNT之间的协同效应，Co-Fe-N@MWCNT不仅具有较大的电化学活性表面积和有效的传输路径，而且实现了上级OER和ORR活性中心的整合。仅需较低的过电位（290 mV）即可实现10 mA cm（-2）的OER电流密度，且ORR催化活性接近商业Pt/C。此外，Co-Fe-N@MWCNT作为一种理想的空气电极材料，也可以应用于锌空气电池，具有较低的电压降和良好的稳定性。即使在100次恒电流充放电循环后，电压间隙也有轻微的变化（约0.03 V）。更重要的是，我们的合成策略可以促进设计更高效的双功能催化剂在各个领域。(C)2017爱思唯尔有限公司版权所有
Zn-air battery, as an ideal energy conversion and storage device, is always limited by the expensive and less-than-ideal air electrode materials. The coupling of outstanding oxygen evolution reaction (OER) active sites (oxides derived from Co-Fe nitrides) and superior oxygen reduction reaction (ORR) active centers (metal-N-C and graphitic N) to acquire high-performance and low-cost catalysts is an ideal solution. Herein, we have successfully combined cobalt-iron bimetallic nitrides with N-doped multi-walled carbon nanotubes (Co-Fe-N@MWCNT) as a robust bifunctional material. Benefiting from the synergistic effect between Co, Fe and MWCNTs, Co-Fe-N@MWCNT not only possesses large electrochemically active surface area and effective transport path, but also realizes the integration of superior OER and ORR active sites. Only a low overpotential (290 mV) is needed to achieve a current density of 10 mA cm(-2) for OER and the ORR catalytic activity is close to that of the commercial Pt/C. Additionally, Co-Fe-N@MWCNT as an ideal air electrode material can also be applied in Zn-air battery, which exhibits low voltage drop and favorable stability. The voltage gap has a slight change (about 0.03 V) even after 100 cycles of galvanostatic charge-discharge. More importantly, the synthetic strategy in our work may facilitate the design of more high-efficient bifunctional catalysts in various domains. (C) 2017 Elsevier Ltd. All rights reserved.