High purity Mn5O8nanoparticles with a high overpotential to gas evolution reactions for high voltage aqueous sodium-ion electrochemical storage
Received date: 15 Mar 2017
Accepted date: 17 May 2017
Published date: 07 Sep 2017
Copyright
Developing electrodes with high specific energy by using inexpensive manganese oxides is of great importance for aqueous electrochemical energy storage (EES) using non-Li charge carriers such as Na-or K-ions. However, the energy density of aqueous EES devices is generally limited by their narrow thermodynamic potential window (~1.23 V). In this paper, the synthesis of high purity layered Mn5O8 nanoparticles through solid state thermal treatment of Mn3O4 spinel nanoparticles, resulting in a chemical formula of [Mn2+2 ][Mn4+3 O82−], evidenced by Rietveld refinement of synchrotron-based X-ray diffraction, has been reported. The electro-kinetic analyses obtained from cyclic voltammetry measurements in half-cells have demonstrated that Mn5O8 electrode has a large overpotential (~ 0.6 V) towards gas evolution reactions, resulting in a stable potential window of 2.5 V in an aqueous electrolyte in half-cell measurements. Symmetric full-cells fabricated using Mn5O8 electrodes can be operated within a stable 3.0 V potential window for 5000 galvanostatic cycles, exhibiting a stable electrode capacity of about 103 mAh/g at a C-rate of 95 with nearly 100% coulombic efficiency and 96% energy efficiency.
Key words: manganese oxides Mn5O8; high voltage; aqueous Na-ion storage
Xiaoqiang SHAN , Fenghua GUO , Wenqian XU , Xiaowei TENG . High purity Mn5O8nanoparticles with a high overpotential to gas evolution reactions for high voltage aqueous sodium-ion electrochemical storage[J]. Frontiers in Energy, 2017 , 11(3) : 383 -400 . DOI: 10.1007/s11708-017-0485-3
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