Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction†,Energy & Environmental Science

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Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-11-15 00:00:00 , DOI: 10.1039/c8ee02656d
Jing Wang _{1,

2,

3,

4,

5} , Wei Liu _{4,

5,

6,

7} , Gan Luo _{7,

8,

9,

10,

11} , Zhijun Li _{1,

2,

3,

4,

5} , Chao Zhao _{1,

2,

3,

4,

5} , Haoran Zhang _{1,

2,

3,

4,

5} , Mengzhao Zhu _{1,

2,

3,

4,

5} , Qian Xu _{4,

5,

6,

7} , Xiaoqian Wang _{1,

2,

3,

4,

5} , Changming Zhao _{1,

2,

3,

4,

5} , Yunteng Qu _{1,

2,

3,

4,

5} , Zhengkun Yang _{1,

2,

3,

4,

5} , Tao Yao _{4,

5,

6,

7} , Yafei Li _{7,

8,

9,

10,

11} , Yue Lin _{2,

4,

7,

12} , Yuen Wu _{1,

2,

3,

4,

5} , Yadong Li _{1,

7,

13,

14}

Affiliation

Herein, we construct a novel electrocatalyst with Fe–Co dual sites embedded in N-doped carbon nanotubes ((Fe,Co)/CNT), which exhibits inimitable advantages towards the oxygen reduction reaction. The electrocatalyst shows state-of-the-art ORR performance with an admirable onset potential (E_onset, 1.15 V vs. 1.05 V) and half-wave potential (E_1/2, 0.954 V vs. 0.842 V), outperforming those of the commercial Pt/C. The ORR test reveals that the performance of the (Fe,Co)/CNT is superior to most of the reported non-precious catalysts in alkaline electrolytes. Furthermore, when employed as a cathode catalyst in a Zn–air battery, the (Fe,Co)/CNT exhibits high voltages of 1.31 V and 1.23 V at discharge current densities of 20 mA cm⁻² and 50 mA cm⁻², respectively. In addition, the power density and the specific energy density reach 260 mW cm⁻² and 870 W h kg_Zn⁻¹. We discover that the Fe–Co dual sites embedded in N-doped porous carbon are beneficial for the activation of oxygen by weakening the O [double bond, length as m-dash]

O bonds.

中文翻译：

明确定义的双位点的协同效应促进了氧还原反应†

在本文中，我们构建了一种新型的电催化剂，具有嵌入N掺杂碳纳米管（（Fe，Co）/ CNT）中的Fe-Co双位点，对氧还原反应具有无与伦比的优势。电催化剂显示了最先进的ORR性能，具有令人赞叹的起始电势（E_起始，1.15 V对1.05 V）和半波电势（E _{1 /} 2，0.954 V对5势。0.842 V），优于商用Pt / C。ORR测试表明，（Fe，Co）/ CNT的性能优于碱性电解质中大多数已报道的非贵金属催化剂。此外，当用作锌空气电池的阴极催化剂时，（Fe，Co）/ CNT在放电电流密度分别为20 mA cm ^-2和50 mA cm ^-2时分别显示出1.31 V和1.23 V的高电压。。另外，功率密度和比能量密度达到260mW cm ^-2和870Wh kg _Zn^-1。我们发现，嵌入N掺杂的多孔碳中的Fe–Co双重位点通过削弱O [双键，长度为m-破折号]

O键有利于氧的活化。

更新日期：2018-11-15

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