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All-Printed High-Performance Flexible Supercapacitors Using Hierarchical Porous Nickel–Cobalt Hydroxide Inks
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-07-21 , DOI: 10.1021/acsaem.2c00947 Zhi Liu 1, 2 , Hongtao Zhou 2 , Fan Zeng 2 , Leihang Hu 2 , Xueli Wu 2 , Xianyin Song 2 , Changzhong Jiang 2 , Xingang Zhang 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-07-21 , DOI: 10.1021/acsaem.2c00947 Zhi Liu 1, 2 , Hongtao Zhou 2 , Fan Zeng 2 , Leihang Hu 2 , Xueli Wu 2 , Xianyin Song 2 , Changzhong Jiang 2 , Xingang Zhang 1, 2
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Supercapacitors have received great attention in the energy storage of flexible wearable electronic products due to their fast charging and discharging. However, low energy density and poor rate performance have always been the main factors limiting their application. Herein, by adjusting the ratio of Ni and Co, optimized porous nanoflower-like Ni/Co-layered double hydroxides (LDH) deliver a large specific capacitance value of 1575 F g–1 at 1 A g–1 and superior rate performance with 86.3% capacity retention from 1 to 50 A g–1. The superior electrochemical performance is mainly attributed to the transfer of electrons from Co to Ni, resulting in an increase in more conductive Co3+ and more active Ni2+. Simultaneously, rich porosity and wider interlayer spacing of Ni/Co LDH facilitate easy electrolyte access and fast ion diffusion within active materials. By combining with screen printing, a flexible Ni3Co1 LDH@graphene//activated carbon (Ni3Co1 LDH@G//AC) asymmetric supercapacitor (ASC) is fabricated, exhibiting outstanding specific areal capacitance of 599 mF cm–2 at 1 mA cm–2, excellent areal energy density of 0.27 mW h cm–2, and power density of 49.9 mW cm–2. Moreover, the capacity of ASC remains 95.8% even after bending to different angles and for 400 times, which shows excellent flexibility. After two ASCs are connected in series and packaged, they can power a watch for more than 60 min after only charging for 50 s, and even if the device is worn on the hand and completely submerged in water, they can still power the watch normally. This work provides inspiration for large-scale production of high-performance supercapacitors and the integration of supercapacitors into wearable electronic products.
中文翻译：
使用分层多孔镍-氢氧化钴油墨的全印刷高性能柔性超级电容器
超级电容器由于其快速充放电的特点，在柔性可穿戴电子产品的储能方面受到了极大的关注。然而，低能量密度和较差的倍率性能一直是限制其应用的主要因素。在此，通过调整 Ni 和 Co 的比例，优化的多孔纳米花状 Ni/Co 层状双氢氧化物 (LDH)在 1 A g -1下提供 1575 F g -1的大比电容值和 86.3 的优异倍率性能% 容量保持率从 1 到 50 A g –1。优异的电化学性能主要归因于电子从 Co 到 Ni 的转移，导致更导电的 Co 3+和更活泼的 Ni 2+增加. 同时，Ni/Co LDH 的丰富孔隙率和更宽的层间距有助于电解质容易进入和活性材料内的快速离子扩散。通过与丝网印刷相结合，制备了柔性Ni 3 Co 1 LDH@graphene//活性炭（Ni 3 Co 1 LDH@G//AC）非对称超级电容器（ASC），其比面积电容为599 mF cm –2在 1 mA cm –2时，出色的面能量密度为 0.27 mW h cm –2，功率密度为 49.9 mW cm –2. 此外，ASC的承载能力在不同角度弯曲400次后仍保持95.8%，表现出极佳的柔韧性。两颗ASC串联封装后，只需充电50s，即可为手表供电60分钟以上，即使设备戴在手上完全浸入水中，仍可正常为手表供电. 这项工作为大规模生产高性能超级电容器以及将超级电容器集成到可穿戴电子产品中提供了灵感。
更新日期：2022-07-21
中文翻译：
使用分层多孔镍-氢氧化钴油墨的全印刷高性能柔性超级电容器
超级电容器由于其快速充放电的特点，在柔性可穿戴电子产品的储能方面受到了极大的关注。然而，低能量密度和较差的倍率性能一直是限制其应用的主要因素。在此，通过调整 Ni 和 Co 的比例，优化的多孔纳米花状 Ni/Co 层状双氢氧化物 (LDH)在 1 A g -1下提供 1575 F g -1的大比电容值和 86.3 的优异倍率性能% 容量保持率从 1 到 50 A g –1。优异的电化学性能主要归因于电子从 Co 到 Ni 的转移，导致更导电的 Co 3+和更活泼的 Ni 2+增加. 同时，Ni/Co LDH 的丰富孔隙率和更宽的层间距有助于电解质容易进入和活性材料内的快速离子扩散。通过与丝网印刷相结合，制备了柔性Ni 3 Co 1 LDH@graphene//活性炭（Ni 3 Co 1 LDH@G//AC）非对称超级电容器（ASC），其比面积电容为599 mF cm –2在 1 mA cm –2时，出色的面能量密度为 0.27 mW h cm –2，功率密度为 49.9 mW cm –2. 此外，ASC的承载能力在不同角度弯曲400次后仍保持95.8%，表现出极佳的柔韧性。两颗ASC串联封装后，只需充电50s，即可为手表供电60分钟以上，即使设备戴在手上完全浸入水中，仍可正常为手表供电. 这项工作为大规模生产高性能超级电容器以及将超级电容器集成到可穿戴电子产品中提供了灵感。
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