Hydrothermally Prepared MnSe₂ Nanosheets As a Novel Electrode Material for Supercapacitor

Abstract

Ever-increasing energy crises require the exploration of sustainable energy conversion and storage systems that are reliable, low-cost and environmentally friendly. The search for Earth-abundant and efficient electrode materials is significant for advanced supercapacitors. Transition metal chalcogenides has regarded as one of the most emerging new materials for electrochemical energy storage device. Manganese diselenide is a low-cost and eco-friendly semiconducting material with applications in lithium ion battery and oxygen reduction catalysis. However, there have been fewer reports on the electrochemical performance research of manganese diselenide. In this study, cubic manganese diselenide (MnSe2) were synthesized by using a one-pot hydrothermal method. Physicochemical characterizations revealed the formation mechanism of MnSe2 nanosheets. Electrochemical analysis suggested the pseudocapacitive nature of MnSe2 electrode, which delivered a specific capacitance of 423 F g-1 at a current density of 1 A g-1, and obtained 203 F g-1 at 30 A g-1. The superior electrochemical performance of MnSe2 nanosheets highlights the potential use as electrode material in supercapacitor.

Wet-chemical assisted synthesis of MnSe/ZnO nanostructures as low-resistance robust novel cathode material for advanced hybrid supercapacitors

“…The capacitance of the samples was determined to be ZnO (380, 345, 305, 260, and 211 F g À1 ) at the current rates of 1, 3, 5, 7, and 10 A g À1 , which was found to be greater than that of graphene-ZnO (12 F g À1 at 0.3 mA), 43 ZnO tetrapods (160.4 F g À1 at 1 A g À1 ), 44 and 470, 431, 390, 332, and 280 F g À1 higher than those of MnSe nanosheets and nanoparticles (141 F g À1 , and 96.76 F g À1 ), 28,45 ZK-1 (610, 570, 513, 471, and 410 F g À1 ), and for ZK-2 (680, 637, 591, 528, and 470 F g À1 ), which is higher than those in several literature reports. 31,38,46,47 Our findings show that the ZK-2 electrode exhibits a relatively superior capacitance over all other electrodes, as seen in Fig. 6e.…”

Hydrothermal Self-Assembly of α-MnSe-Loaded Honeycomb-Like Biomimetic Ti3C2Tx/Graphene Aerogel Microstructure (α-MnSe/Ti3C2Tx/rGO) as Efficient Electrode Material for Energy Storage Application

“…As prepared, MnSe exhibited low internal resistance (0.37 Ω) and favorable specific capacity (84.7 mAh/g at 10 mV/s). In another report, Ma and co-workers reported cube-shaped MnSe 2 with good specific capacity (423 F/g at 1 A/g) and rate capability (203 F/g at 30 A/g) . Despite the attractive electrochemical attributes, TMSes suffer from mechanical instability and electric contact loss due to severe volume changes during electrochemical reactions, particularly at high current densities that impact the cyclic life and rate performance of the electrode. − Furthermore, aggregation of TMSes blocks the electroactive sites which impedes optimal electrochemical activity and affects theoretical capacity. , …”