Ultrathin Co3O4 Layers with Large Contact Area on Carbon Fibers as High‐Performance Electrode for Flexible Zinc–Air Battery Integrated with Flexible Display |
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| Authors: | Xu Chen Bin Liu Cheng Zhong Zhi Liu Jie Liu Lu Ma Yida Deng Xiaopeng Han Tianpin Wu Wenbin Hu Jun Lu |
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| Institution: | 1. State Key Laboratory of Metal Matrix Composites, Department of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Material Science and Engineering, Tianjin University, Tianjin, China;3. Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin, China;4. X‐ray Science Division, Argonne National Laboratory, Lemont, IL, USA;5. Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA |
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| Abstract: | A facile and binder‐free method is developed for the in situ and horizontal growth of ultrathin mesoporous Co3O4 layers on the surface of carbon fibers in the carbon cloth (ultrathin Co3O4/CC) as high‐performance air electrode for the flexible Zn–air battery. In particular, the ultrathin Co3O4 layers have a maximum contact area on the conductive support, facilitating the rapid electron transport and preventing the aggregation of ultrathin layers. The ultrathin feature of Co3O4 layers is characterized by the transmission electron microscopy, Raman spectra, and X‐ray absorption fine structure spectroscopy. Benefiting from the high utilization degree of active materials and rapid charge transport, the mass activity for oxygen reduction and evolution reactions of the ultrathin Co3O4/CC electrode is more than 10 times higher than that of the carbon cloth loaded with commercial Co3O4 nanoparticles. Compared to the commercial Co3O4/CC electrode, the flexible Zn–air battery using ultrathin Co3O4/CC electrode exhibits excellent rechargeable performance and high mechanical stability. Furthermore, the flexible Zn–air battery is integrated with a flexible display unit. The whole integrated device can operate without obvious performance degradation under serious deformation and even during the cutting process, which makes it highly promising for wearable and roll‐up optoelectronics. |
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| Keywords: | cobalt oxides flexible zinc– air batteries in situ growth integrated device ultrathin nanofilms |
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