journal article·2023-10Open access

2D Conjugated Metal–Organic Frameworks Embedded with Iodine for High‐Performance Ammonium‐Ion Hybrid Supercapacitors

Mingming Gao, Zhiyong Wang, Zaichun Liu, Ying Huang, Faxing Wang, Mingchao Wang, Sheng Yang, Junke Li, Jinxin Liu, Haoyuan Qi, Panpan Zhang, Xing Lu, Xinliang Feng

Advanced Materials· Volume 35· Issue 41

Abstract

Abstract Ammonium ions (NH4+) are emerging non‐metallic charge carriers for advanced electrochemical energy storage devices, due to their low cost, elemental abundance, and environmental benignity. However, finding suitable electrode materials to achieve rapid diffusion kinetics for NH4+ storage remains a great challenge. Herein, a 2D conjugated metal–organic framework (2D c‐MOF) for immobilizing iodine, as a high‐performance cathode material for NH4+ hybrid supercapacitors, is reported. Cu‐HHB (HHB = hexahydroxybenzene) MOF embedded with iodine (Cu‐HHB/I2) features excellent electrical conductivity, highly porous structure, and rich accessible active sites of copper‐bis(dihydroxy) (Cu─O4) and iodide species, resulting in a remarkable areal capacitance of 111.7 mF cm−2 at 0.4 mA cm−2. Experimental results and theoretical calculations indicate that the Cu─O4 species in Cu‐HHB play a critical role in binding polyiodide and suppressing its dissolution, as well as contributing to a large pseudocapacitance with adsorbed iodide. In combination with a porous MXene anode, the full NH4+ hybrid supercapacitors deliver an excellent energy density of 31.5 mWh cm−2 and long‐term cycling stability with 89.5% capacitance retention after 10 000 cycles, superior to those of the state‐of‐the‐art NH4+ hybrid supercapacitors. This study sheds light on the material design for NH4+ storage, enabling the development of novel high‐performance energy storage devices.
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Research context

OpenAlex topics: MXene and MAX Phase Materials · Supercapacitor Materials and Fabrication · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Luoyu Road 1037 Wuhan 430074 China

Center for Advancing Electronics Dresden (cfaed) & Faculty of Chemistry and Food Chemistry Technische Universität Dresden Mommsenstrasse 4 01069 Dresden Germany

Department of Synthetic Materials and Functional Devices Max Planck Institute of Microstructure Physics D‐06120 Halle (Saale) Germany

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China

School of Environmental Science and Engineering Huazhong University of Science and Technology Luoyu Road 1037 Wuhan 430074 China

Central Facility of Electron Microscopy Electron Microscopy Group of Materials Science Universität Ulm 89081 Ulm Germany

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation

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