High-performing rechargeable/flexible zinc-air batteries by coordinated hierarchical Bi-metallic electrocatalyst and heterostructure anion exchange membrane
High-performing rechargeable/flexible zinc-air batteries by coordinated hierarchical Bi-metallic electrocatalyst and heterostructure anion exchange membrane
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DOI：
10.1016/j.nanoen.2019.104021
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发表时间：
2019-11
期刊：
影响因子：
17.6
通讯作者：
Nengneng Xu;Yanxing Zhang;Min Wang;Xiujun Fan;Tao Zhang;Luwei Peng;Xiao-Dong Zhou;Jinli Qiao
中科院分区：
文献类型：
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作者：
Nengneng Xu;Yanxing Zhang;Min Wang;Xiujun Fan;Tao Zhang;Luwei Peng;Xiao-Dong Zhou;Jinli Qiao
由于缺乏高效且低成本的氧还原反应/析氧反应（ORR/OER）催化剂和碱性阴离子交换膜（AEM），先进的可充电锌空气电池在从可穿戴电子产品到电动汽车的许多应用中受到很大阻碍。本文采用水热法制备了多孔Co 3 O 4/MnO 2-CNTs杂化材料，并采用简单的溶液浇铸法制备了半互穿网络结构的AEM（CS/EMImC-Co-EP/GO）。多孔纳米粒子和蛹状杂化物以及强的双金属耦合效应为ORR/OER的反应物和电子转移构建了高速公路和缓冲区。另外，由于底层Co原子的竞争，密度泛函理论（DFT）证明了MnO 2（110）表面相邻Mn位（Mn 1和Mn 2）被明显活化，使Mn 1，Mn 2的3d态密度整体向低能方向移动，从而促进了杂化物的催化活性。因此，Co 3 O 4/MnO 2-CNTs表现出上级ORR/OER活性，具有0.85 V的低电位差（ΔE），在可充电水性锌空气电池（功率密度：534 mW cm−2）中表现出令人印象深刻的性能。此外，结合集成到可充电柔性全固态锌空气电池和堆叠中的AEM，即使在不同的弯曲角度下，也可以实现可穿戴设备的增强性质，这得益于高羟基阴离子电导率和AEM半互穿网络的显著柔性，其通过跳跃和载体机制的协同作用加速离子传输。此外，柔性全固态锌空气电池显示出优异的CO2耐受毒性。
Due to the lack of highly efficient and low-cost oxygen reduction reaction/oxygen evolution reaction (ORR/OER) catalyst and alkaline anion exchange membrane (AEM), advanced rechargeable zinc-air batteries are largely hindered in many applications from wearable electronics to electric vehicles. Herein, a hybrid of porous Co3O4anchoring on MnO2, then interpenetrating with CNTs (Co3O4/MnO2-CNTs) is synthesized via facile hydrothermal process, and an AEM (CS/EMImC-Co-EP/GO) employing semi-interpenetrating network structure is fabricated with a simple solution-casting method. The porous nanoparticles and chrysalis-like hybrid as well as strong bi-metallic coupling effect build highways and buffer zones for reactant and electrons transfer for ORR/OER. In addition, due to the competition of bottom Co atoms, the density functional theory (DFT) proves that the neighbor Mn sites (Mn1 and Mn2) of the MnO2(110) surface are evidently activated, which prompts the catalytic activity of hybrids by making the Mn1, Mn2 3d density of states move forward lower energy entirely. As a result, Co3O4/MnO2-CNTs exhibit superior ORR/OER activities with the low potential difference (ΔE) of 0.85 V and impressive performances in rechargeable aqueous zinc-air batteries (power density: 534 mW cm−2). Moreover, combining AEM integrated into rechargeable flexible all-solid-state zinc-air batteries and stack, the enhancement natures of wearable devices are achieved even under different bending angles benefiting from high hydroxyl anion conductivity and remarkable flexibility of AEM semi-interpenetrating network, which accelerates ion transport by the synergy of hopping and vehicle mechanisms. Furthermore, the flexible all-solid-state zinc-air batteries show excellent tolerance toxicity of CO2.