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All‐in‐One Bifunctional Oxygen Electrode Films for Flexible Zn‐Air Batteries
Small ( IF 13.0 ) Pub Date : 2018-10-17 , DOI: 10.1002/smll.201803409 Sha Zeng 1, 2 , Xiao Tong 1 , Susheng Zhou 1 , Bo Lv 1, 2 , Jian Qiao 1 , Yanhui Song 1 , Minghai Chen 1, 2 , Jiangtao Di 1, 2 , Qingwen Li 1, 2
Small ( IF 13.0 ) Pub Date : 2018-10-17 , DOI: 10.1002/smll.201803409 Sha Zeng 1, 2 , Xiao Tong 1 , Susheng Zhou 1 , Bo Lv 1, 2 , Jian Qiao 1 , Yanhui Song 1 , Minghai Chen 1, 2 , Jiangtao Di 1, 2 , Qingwen Li 1, 2
Affiliation
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As a promising energy‐storage device, rechargeable Zn‐air batteries have attracted considerable interests. Herein, a bifunctional oxygen electrode film prepared by adhering NiCo2O4 nanosheets to a nitrogen and oxygen dual‐doped carbon nanotubes film in a large scale is reported. The resulting self‐supporting film electrode is multifunctional, which integrates a porous conducting structure for air diffusion and charge transfer, high‐performance catalysts for oxygen reduction and evolution, and novel structural flexibility. The composite film demonstrates excellent oxygen reduction/evolution reaction catalytic activities with low Tafel slopes (50 mV dec−1 for oxygen reduction reaction; 92 mV dec−1 for oxygen evolution reaction). Without any additional current collector, gas diffusion layer, or binder, the obtained bifunctional film performs as an “all‐in‐one” air electrode in a Zn‐air battery. A 50‐cm‐long cable‐shaped Zn‐air battery based on such a film air electrode exhibits high operating potentials (≈1.2 V at 0.25 mA cm−2), low charging–discharging overpotentials (≈0.7 V), and stable cycling performance. Moreover, the flexible cable Zn‐air batteries show excellent stability under different deformation conditions. The proposed concept of constructing scalable, all‐in‐one, freestanding, and flexible air electrodes would pave the way to develop next‐generation wearable and portable energy‐storage devices.
中文翻译：
适用于柔性Zn-空气电池的多合一双功能氧电极膜
作为一种有前途的储能设备，可再充电锌空气电池吸引了相当大的兴趣。在本文中，报道了通过将NiCo 2 O 4纳米片大规模粘附到氮和氧双掺杂碳纳米管薄膜上而制备的双功能氧电极薄膜。由此产生的自支撑膜电极是多功能的，它集成了用于空气扩散和电荷转移的多孔导电结构，用于氧还原和释放的高性能催化剂以及新颖的结构灵活性。该复合膜表现出优异的氧还原/放出反应催化活性，且塔菲尔斜率低（氧还原反应为50 mV dec -1； 92 mV dec -1（用于氧气释放反应）。在没有任何其他集电器，气体扩散层或粘合剂的情况下，所获得的双功能膜可充当锌空气电池中的“多合一”空气电极。基于这种薄膜空气电极的50 cm长的电缆形Zn-air电池具有较高的工作电势（在0.25 mA cm -2时约为1.2 V ），低的充电-放电过电势（约为0.7 V）和稳定的循环表现。此外，柔性电缆Zn-air电池在不同的变形条件下均具有出色的稳定性。提出的构建可伸缩，一体，独立和灵活的空气电极的概念将为开发下一代可穿戴和便携式储能设备铺平道路。
更新日期：2018-10-17
中文翻译：
适用于柔性Zn-空气电池的多合一双功能氧电极膜
作为一种有前途的储能设备，可再充电锌空气电池吸引了相当大的兴趣。在本文中，报道了通过将NiCo 2 O 4纳米片大规模粘附到氮和氧双掺杂碳纳米管薄膜上而制备的双功能氧电极薄膜。由此产生的自支撑膜电极是多功能的，它集成了用于空气扩散和电荷转移的多孔导电结构，用于氧还原和释放的高性能催化剂以及新颖的结构灵活性。该复合膜表现出优异的氧还原/放出反应催化活性，且塔菲尔斜率低（氧还原反应为50 mV dec -1； 92 mV dec -1（用于氧气释放反应）。在没有任何其他集电器，气体扩散层或粘合剂的情况下，所获得的双功能膜可充当锌空气电池中的“多合一”空气电极。基于这种薄膜空气电极的50 cm长的电缆形Zn-air电池具有较高的工作电势（在0.25 mA cm -2时约为1.2 V ），低的充电-放电过电势（约为0.7 V）和稳定的循环表现。此外，柔性电缆Zn-air电池在不同的变形条件下均具有出色的稳定性。提出的构建可伸缩，一体，独立和灵活的空气电极的概念将为开发下一代可穿戴和便携式储能设备铺平道路。
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