ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis of Fe₃Se₄/carbon composites from different metal–organic frameworks and their comparative lithium/sodium storage performances

Zhen Shen, Chenhao Zhao, Zhibiao Hu, Chunye Fu, fenfen Lv, and Qilang Lin

College of Materials Science and Engineering, Fuzhou University, Fuzhou, China

E-mail: zhaochenhao123456@163.com

Received: 27 June 2020  Accepted: 16 January 2021

Abstract:

Synthesis of transition metal selenides from metal–organic frameworks (MOFs) has become one of the common methods, and their structure and properties are depended upon the MOFs. In this study, different Fe-based MOFs have been used to prepare Fe₃Se₄/carbon composites by synchronous selenization and carbonization process. The Fe₃Se₄/carbon composite obtained from Fe-Mil-88A possessing a rice-like structure is composed of numerous Fe₃Se₄ nanoparticles and abundant carbon, which has been observed by scanning/transmission electron microscope. X-ray photoelectron spectrums and thermogravimetric analysis indicate this Fe₃Se₄/carbon composite composed of major Fe²⁺ and minor Fe³⁺ has a carbon content of 12.4wt%. As anode material of lithium-ion battery, the composite can deliver a discharge capacity of 707.4 mAh/g at 0.2 A/g after 100 cycles. Even at a high rate of 5 A/g, it still reaches a capacity value of 566.7 mAh/g. As anode material of sodium-ion battery, this composite retains a discharge capacity of 417.3 mAh/g at 0.2 A/g after 50 cycles, and a capacity value of 153.4 mAh/g can be reached at a high rate of 5 A/g. The good electrochemical performances are partially determined by high contribution of capacitive-controlled behaviors from the investigation on cyclic voltammetry. The electrochemical performance of this composite is better than that of the other one, which is derived from Fe-Mil-88B. The different energy storage performances determined by their structural difference also have been discussed in the text.

Keywords: Fe3se4/carbon composites; Fe-based metal–organic frameworks; Lithium-ion battery anodes; Sodium-ion battery anodes

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01524-y

Chemical Papers 75 (6) 2737–2747 (2021)