Zhang Aitang, Zong Hanwen, Fu Hucheng, Wang Lihua, Cao Xueying, Zhong Yuxue, Liu Bingping, Liu Jingquan
Institute for Graphene Applied Technology Innovation, College of Materials Science and Engineering, Collaborative Innovation Centre for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China.
Key Laboratory for Colloid and Interface Chemistry of State Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
J Colloid Interface Sci. 2022 Jul 15;618:375-385. doi: 10.1016/j.jcis.2022.03.062. Epub 2022 Mar 16.
Metal-organic frameworks (MOFs) are attracting tremendous research interest because of their rich redox sites and high specific area which are beneficial for the energy storage applications. Nevertheless, the poor conductivity, low mechanical strength and unsatisfactory capacity severely hinder their wide application. Hence, it is of practical significance to design highly efficient and facile strategy to solve these issues. Herein, vertically oriented ZnO nanorod arrays are applied as precursor to synthesize laminated scale-like and highly-oriented Ni/Zn-MOF/ZnO nanocomposite. Owing to the desirable conductivity resulting from the doping nickel ions and the interaction between ZnO and its relative MOF, the fabricated 0.3Ni/Zn-MOF/ZnO@CC electrode exhibits an electrochemical capacitance of 1693 mF cm at 1 mA cm. Moreover, the electrochemical capacitance retention of 80.7 % after 2500 cycling numbers is obtained under the constant current density of 10 mA cm and the low internal resistance R of 0.89 Ω is observed. For practical application, the as-synthesized laminated scale-like Ni/Zn-MOF/ZnO@CC nanocomposite is served as positive electrode to fabricate solid-state asymmetric supercapacitor device. Moreover, a 2.5 V indicator could be powered for 8 min when the prepared supercapacitor units are connected. This work demonstrates the promising potential of the synthesized scale-like Ni/Zn-MOF composites for electrochemical energy storage applications.
金属有机框架材料（MOFs）因其丰富的氧化还原位点和高比表面积而吸引了大量的研究兴趣，这些特性有利于储能应用。然而，其导电性差、机械强度低和容量不理想严重阻碍了它们的广泛应用。因此，设计高效简便的策略来解决这些问题具有实际意义。在此，垂直取向的ZnO纳米棒阵列被用作前驱体，以合成层状鳞片状且高度取向的Ni/Zn-MOF/ZnO纳米复合材料。由于掺杂镍离子导致的理想导电性以及ZnO与其相关MOF之间的相互作用，制备的0.3Ni/Zn-MOF/ZnO@CC电极在1 mA cm下表现出1693 mF cm的电化学电容。此外，在10 mA cm的恒定电流密度下循环2500次后，电化学电容保持率为80.7%，并且观察到低内阻R为0.89Ω。对于实际应用，合成的层状鳞片状Ni/Zn-MOF/ZnO@CC纳米复合材料用作正极来制造固态不对称超级电容器装置。此外，当连接制备的超级电容器单元时，一个2.5 V的指示器可以供电8分钟。这项工作证明了合成的鳞片状Ni/Zn-MOF复合材料在电化学储能应用中的广阔前景。
