Tailoring the hetero-structure of iron oxides in the framework of nitrogen doped carbon for the oxygen reduction reaction and zinc–air batteries,Journal of Materials Chemistry A

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Tailoring the hetero-structure of iron oxides in the framework of nitrogen doped carbon for the oxygen reduction reaction and zinc–air batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-12-9 , DOI: 10.1039/d0ta09828k
Zhourong Xiao _{1,

2,

3,

4,

5} , Chan Wu _{1,

2,

3,

4,

5} , Wei Wang _{1,

2,

3,

4,

5} , Lun Pan _{1,

2,

3,

4,

5} , Jijun Zou _{1,

2,

3,

4,

5} , Li Wang _{1,

2,

3,

4,

5} , Xiangwen Zhang _{1,

2,

3,

4,

5} , Guozhu Li _{1,

2,

3,

4,

5}

Affiliation

Rationally constructing hetero-structures of iron species for efficient oxygen reduction reaction (ORR) remains challenging. Herein, an efficient and robust strategy has been developed for building and tailoring FeO_x/Fe hetero-structures. By tuning the temperature of H₂ treatment, highly dispersed FeO_x/Fe hetero-structures with controllable composition and multiple exposed crystal planes have been obtained to increase the electro-conductivity and hydrophilicity for efficient ORR. The resulting as-prepared Fe₂O₃@NC-450 exhibited remarkable ORR activity with an E_onset value of 1.001 V, E_1/2 of 0.838 V and limited current density of 6.71 mA cm⁻², which are superior to those of commercial 20 wt% Pt/C (E_onset = 0.994 V, E_1/2 = 0.828 V, 5.19 mA cm⁻²). Moreover, Fe₂O₃@NC-450 provided a high power density of 156.6 mW cm⁻², which is 2.3 times that of 20 wt% Pt/C (68 mW cm⁻²) in a zinc–air battery test. In addition, Fe₂O₃@NC-450 had a discharge time of 29 h, which is longer than that of 20 wt% Pt/C (23.5 h). This work provides an alternative efficient way to rationally construct hetero-structures of metal oxides and metal for next-generation ORR catalysts and metal–air batteries.

中文翻译：

在氮掺杂碳的框架内针对氧化还原反应和锌-空气电池量身定制氧化铁的异质结构

合理构造铁物种的异质结构以进行有效的氧还原反应（ORR）仍然具有挑战性。在本文中，已经开发了用于构建和定制FeO _x / Fe异质结构的有效且鲁棒的策略。通过调节H ₂处理的温度，已获得具有可控组成和多个暴露晶面的高度分散的FeO _x / Fe异质结构，以提高导电性和亲水性，从而实现有效的ORR。将得到的所制备的Fe ₂ ö ₃以@ NC-450表现出显着的ORR活性Ë_发病1.001的V值，ê _1/20.838 V的峰值电流和6.71 mA cm ^-2的极限电流密度，优于市售的20 wt％Pt / C（E_起始= 0.994 V，E _1/2 = 0.828 V，5.19 mA cm ^-2）。而且，Fe ₂ O ₃ @ NC-450提供了156.6 mW cm ^-2的高功率密度，是锌-空气电池测试中20 wt％Pt / C（68 mW cm ^-2）的2.3倍。另外，Fe ₂ O ₃@ NC-450的放电时间为29 h，比20 wt％Pt / C的放电时间（23.5 h）长。这项工作为合理构造下一代ORR催化剂和金属-空气电池的金属氧化物和金属的异质结构提供了另一种有效途径。

更新日期：2020-12-09

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