Engineering Hierarchical Co@N-Doped Carbon Nanotubes/α-Ni(OH)2 Heterostructures on Carbon Cloth Enabling High-Performance Aqueous Nickel–Zinc Batteries

• Published in: ACS applied materials & interfaces 2021-05, Vol.13 (19), p.22304-22313
• Main Authors: Zhu, Longzhen, Fei, Ban, Xie, Yulan, Cai, Daoping, Chen, Qidi, Zhan, Hongbing
• Format: Article
• Language: English
• Subjects: Energy, Environmental, and Catalysis Applications
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c01711

Searching for high-performance Ni-based cathodes plays an important role in developing better aqueous nickel–zinc (Ni–Zn) batteries. For this purpose, herein, we demonstrate the design and synthesis of ultrathin α-Ni­(OH)2 nanosheets branched onto metal–organic frameworks (MOFs)-derived 3D cross-linked N-doped carbon nanotubes encapsulated with tiny Co nanoparticles (denoted as Co@NCNTs/α-Ni­(OH)2), which are directly supported on a flexible carbon cloth (CC). An aqueous Ni–Zn battery employing the hierarchical CC/Co@NCNTs/α-Ni­(OH)2 as the binder-free cathode and a commercial Zn plate as the anode is fabricated, which displays an ultrahigh capacity (316 mAh g–1) and energy density (540.4 Wh kg–1) at 1 A g–1 as well as excellent rate capability (238 mAh g–1 at 10 A g–1) and superior cycling performance (about 84% capacity retention after 2000 cycles at 10 A g–1). The impressive electrochemical performance might benefit from the rich active sites, rapid electron transfer, cushy electrolyte access, rapid ion transport, and robust structural stability. In addition, the quasi-solid-state CC/Co@NCNTs/α-Ni­(OH)2//Zn batteries are also successfully assembled with polymer electrolyte, indicating the great potential for portable and wearable electronics. This work might provide important guidance for constructing carbon-based hybrid materials directly supported on conductive substrates as high-performance electrodes for energy-related devices.