MOF derived graphitic carbon nitride/oxygen vacancies-rich zinc oxide nanocomposites with enhanced supercapacitive perfo
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ORIGINAL PAPER
MOF derived graphitic carbon nitride/oxygen vacancies-rich zinc oxide nanocomposites with enhanced supercapacitive performance Jiaqi Shen 1 & Peng Wang 1 & Huasheng Jiang 1 & Hui Wang 2 & Bruno G. Pollet 3 & Rongfang Wang 2 & Shan Ji 1 Received: 23 March 2020 / Revised: 18 April 2020 / Accepted: 23 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Supercapacitors with high power density and durability have shown enormous potential for smart electronics. Herein, a novel graphitic carbon nitride (g-C3N4) coated with oxygen vacancies-rich ZnO (OZCN) nanocomposites was prepared from zeolitic imidazolate framework precursor by direct thermal decomposition melamine in air. The as-prepared OZCN nanocomposites exhibited high capacitive performance (3,000 F g-1 at 3 A g-1) and excellent cycling stability due to the synergetic effect of gC3N4 and oxygen vacancies-rich ZnO. Additionally, the assembled asymmetric supercapacitor displayed an energy density of 100.9 Wh kg-1, while the capacitance retention remained at 86.2% even after 1,000 cycles at 7 A g-1. This study is highlighting a new way for designing metal oxide electrode possessing excellent electronic properties for durable and low-cost energy storage devices. Keywords Energy storage . Supercapacitor . ZIF-8 . Graphitic carbon nitride . Zinc oxide
Introduction With the development of portable electronic devices and hybrid electric vehicles, currently commercial large-capacity and fastcharging energy storage devices cannot satisfy consumer’s demands [1–4]. Supercapacitors, as energy electrochemical storage devices, are attracting widespread attention due to their various advantages, such as high Coulomb efficiency, excellent specific capacitance, and superior cycling stability [5–8].
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03597-3) contains supplementary material, which is available to authorized users. * Peng Wang [email protected] * Shan Ji [email protected] 1
College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, Jiaxing 314001, China
2
State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
3
Department of Energy and Process Engineering, Faculty of Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Zinc oxide (ZnO) nanomaterials are regarded as a promising candidate material for supercapacitors [9–11], due to their low cost, chemical stability, high energy density (ca. 650 A g-1), and environmental friendliness. ZnO nanomaterials show distinctive spatial structures and high effective surface areas, which can meet some specific requirements in supercapacitor applications [12, 13]. Unfortunately, the low rate capability and the poor reusability of ZnO materials seriously limit their practical applications, which can be attributed to the slow Faraday redox kinetics and low
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