Core/shell design of efficient electrocatalysts based on NiCo2O4 nanowires and NiMn LDH nanosheets for rechargeable zinc–air batteries†,Journal of Materials Chemistry A

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Core/shell design of efficient electrocatalysts based on NiCo2O4 nanowires and NiMn LDH nanosheets for rechargeable zinc–air batteries†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-05-09 00:00:00 , DOI: 10.1039/c8ta02608d
Xiaolong Guo _{1,

2,

3,

4,

5} , Tianxu Zheng _{3,

5,

6,

7,

8} , Guipeng Ji _{1,

2,

3,

4,

5} , Ning Hu _{1,

2,

3,

4,

5} , Chaohe Xu _{1,

2,

3,

4,

5} , Yuxin Zhang _{3,

5,

6,

7,

8}

Affiliation

Rechargeable zinc–air (Zn–air) batteries having high theoretical energy density are the most attractive energy technologies for future electric vehicles and flexible/wearable electronics. However, the serious lack of highly efficient and cost-effective oxygen electrocatalysts is one of the major obstacles for their future commercialization. Herein, we presented a core/shell design based on porous NiCo₂O₄ nanowires and ultrathin NiMn LDH nanosheets as an efficient method for the synthesis of electrocatalysts for rechargeable Zn–air batteries. Due to the large active surface area, rapid mass/charge transport, and high electron conductivity as well as unique structures, the core/shell NiCo₂O₄@NiMn LDH materials could deliver a rather low OER overpotential of 255 mV at 10.0 mA cm⁻² while maintaining good stability in alkaline media. When these materials were further employed as air-cathode materials for Zn–air batteries, they exhibited an ultrahigh energy density (866 W h kg⁻¹), superior reversibility (initial round-trip efficiency of 63.5%) and excellent stability (voltage gap increased by only about 20 mV after 500 cycles), which were much better than those of commercial Ir/C catalyst. Furthermore, the as-prepared flexible solid Zn–air battery also displayed very good mechanical properties, long cycle life and outstanding round-trip efficiency (70–74%).

中文翻译：

基于NiCo ₂ O ₄纳米线和NiMn LDH纳米片的高效电催化剂的核/壳设计，用于可充电锌空气电池†

具有高理论能量密度的可再充电锌空气（Zn-air）电池是未来电动汽车和柔性/可穿戴电子设备最有吸引力的能源技术。然而，严重缺乏高效和具有成本效益的氧气电催化剂是其未来商业化的主要障碍之一。在这里，我们提出了一种基于多孔NiCo ₂ O ₄纳米线和超薄NiMn LDH纳米片的核/壳设计，作为合成可充电Zn-空气电池的电催化剂的有效方法。由于大的有效表面积，快速的质量/电荷传输，高的电子电导率以及独特的结构，核/壳NiCo ₂ O ₄NiMn LDH材料可以在10.0 mA cm ^-2时提供255 mV的相当低的OER过电势，同时在碱性介质中保持良好的稳定性。当这些材料进一步用作锌-空气电池的空气阴极材料时，它们表现出超高的能量密度（866 W h kg ^-1），优异的可逆性（初始往返效率为63.5％）和出色的稳定性（电压差）在500个循环后仅增加了约20 mV），这比市售Ir / C催化剂要好得多。此外，所制备的柔性固态锌空气电池还显示出非常好的机械性能，较长的循环寿命和出色的往返效率（70-74％）。

更新日期：2018-05-09

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