Fe, N掺杂二维多孔碳双功能催化剂及锌-空气电池中的应用

doi:10.15541/jim20180260

摘要/Abstract

摘要：

在石墨烯表面负载金属有机框架材料ZIF-8, 同时在金属有机框架材料表面分散Fe-2,2-Bipy螯合物, 通过高温煅烧分解制备了Fe, N 掺杂多孔碳催化剂材料。采用SEM, XRD, XPS对制备的催化剂材料进行了形貌、结构以及成分分析。采用旋转圆盘电极, CV曲线, LSV曲线对Fe, N掺杂多孔碳催化剂材料的氧还原(ORR)以及析氧(OER)电催化性能进行了分析。并且将Fe, N 掺杂多孔碳催化剂应用于锌-空气电池。结果表明, 所制备的Fe, N掺杂多孔碳催化剂材料显示出均匀的二维结构形貌, Fe元素含量为1.32%。催化剂在0.1 mol/L KOH溶液中半波电位为0.83 V, 在1 mol/L KOH溶液中, 10 mA/cm²电流密度下过电势为420 mV。将催化剂应用于锌-空气电池, 锌-空气电池功率密度达到245 mV/cm², 并且表现出优异的循环稳定性。

关键词: Fe, N掺杂, 二维多孔材料, 双功能催化剂, 锌-空气电池

Abstract:

Fe, N doped 2D porous carbon catalyst was synthesized by pyrolysizing the precursor, ZIF-8, on graphene. Meanwhile, Fe-2,2-bipy were coordinated on ZIF-8. The catalyst was analyzed by SEM, XRD, and XPS for morphology, structure and component. The ORR and OER performance of the Fe, N doped 2D porous carbon catalyst were characterized by RDE, CV curves and LSV curves. It was found that the Fe, N doped 2 D porous carbon catalyst shows uniform 2D structure and that the content of Fe element is 1.32%. The catalyst shows 0.83 V half-wave potentials for oxygen reduction reaction (ORR) in 0.1 mol/L KOH solution and 420 mV over-potential for oxygen evolution reaction (OER) at 10 mA/cm²in 1 mol/L KOH solution. Then, a zinc-air battery was assembled using as-synthesized catalyst. The power density of zinc-air battery is up to 245 mV/cm². Furthermore, it shows superior cycling stability.

Key words: Fe, N doped, 2 D porous materials, bifuncational catalyst, zinc-air battery

中图分类号:

O646

马龙涛, 支春义. Fe, N掺杂二维多孔碳双功能催化剂及锌-空气电池中的应用[J]. 无机材料学报, 2019, 34(1): 103-108.

MA Long-Tao, ZHI Chun-Yi. Fe, N Doped 2D Porous Carbon Bifunctional Catalyst for Zinc-air Battery[J]. Journal of Inorganic Materials, 2019, 34(1): 103-108.

图/表 4

图1 石墨烯的AFM照片(a)以及相应的厚度曲线, Fe, N掺杂多孔碳催化剂的SEM照片(c)和XRD图谱(d)

Fig. 1 (a) AFM image and (b) corresponding thickness curves of graphene, (c) SEM image and (d) XRD pattern of Fe, N-doped porous carbon catalyst

图2 Fe, N掺杂多孔碳催化剂的XPS 图谱

Fig. 2 XPS spectra of Fe, N-doped porous carbon catalysts (a) Survey spectrum; (b) C1s; (c) N1s; (d) Fe2p

图3 (a) Fe, N掺杂多孔碳催化剂在氮和氧饱和的0.1 mol/L KOH溶液条件下的CV曲线; (b)催化剂在氧饱和0.1 mol/L KOH溶液条件下, 不同转速条件下的氧还原LSV曲线; (c) 根据K-L公式, 不同转速条件下LSV曲线计算得到的电子转移数; (d) Fe, N掺杂多孔碳催化剂在氧饱和的0.1 mol/L KOH溶液条件下的析氧LSV曲线

Fig. 3 (a) CV curves of the Fe, N-doped porous carbon catalyst in a nitrogen- and oxygen-saturated 0.1 mol/L KOH aqueous solution; (b) ORR polarization curves of catalysts recorded at different rotating speed; (c) The K-L plots at different potentials including electron transfer number (n) per oxygen of catalyst; (d) OER polarization curves of catalysts at 1600 r/min in an oxygen-saturated 0.1 mol/L aqueous KOH solution

图4 (a)Fe, N 掺杂多孔碳催化剂用于锌-空气电池的放电曲线以及相应的功率密度曲线; (b) 锌-空气电池的放电-充电曲线; (c) 在电流密度10 mA/cm2条件下, 锌-空气电池的循环稳定能测试结果

Fig. 4 (a) Discharge polarization and corresponding power density curves of zinc-air battery using Fe, N-doped porous carbon catalyst; (b) discharge-charge polarization curves of zinc-air battery; and (c) cycling measurements for rechargeability at a current density of 10 mA/cm2

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