Preparation of ball‐flower‐like MoS ₂ as a superior electrode for pseudocapacitor

Abstract

A sodium polyacrylate-mediated strategy was employed to prepare well-defined MoS 2 ball-flower-like nanomaterials. It was found that the polyacrylate acted as a morphology-directing agent to promote MoS 2 nanosheets to self-assemble into ball-flowers with 3D hierarchical structures. Moreover, as an electrode applied in a supercapacitor, the ball-flower-like MoS 2 exhibited a remarkable pseudocapacitive performance such as a high specific capacitance and superior cycling durability.

Recent advances in oxygen deficient metal oxides: Opportunities as supercapacitor electrodes

“…Several materials such as MoO 3 , 138 RuO 2 , 139,140 Ni(OH) 2 , 141,142 NiO 2 , 143 MnO 2 , 144,145 as well as sulfide (MoS 2 ) [146][147][148] and conductive polymer (polyaniline (PANI) and polypyrrole) have been configured into anode materials for supercapacitor applications. [149][150][151] The monovalent transition MOs hold high theoretical…”

Layered Cu1–zMn1+zO2 Crednerite: Mapping the Phase Stabilization Region via Precise Compositional Control for Optimum Supercapacitor Performance

“…All Cu 1−z Mn 1+z O 2 crednerite samples gave typical faradaic pseudocapacitive behavior because the galvanostatic charge−discharge (GCD) curves at different current densities of 1, 2, 5, 10, and 20 A/g are asymmetric (Figure S18), and the potentials of the charge−discharge platform are nearly the same as the redox potential in their CV curves. 46,47 In particular for the sample 055−85, a long charge−discharge time observed in GCD curves at each current density means a maximum capacitance storage per unit mass. Figure S19 compares the electrochemical impedance spectra (EIS) of the sample 055−85 with the best supercapacitor performance and the samples with identical x or T to 055−85.…”

“…This behavior may involve reversible Faraday redox reactions of the transition metal with OH – ions in the alkaline electrolyte, as reported by others. , Preliminary examination of these CV curves confirms that the enclosed CV integral area and redox peak current for sample 055–85 are the largest at each scan rate among all samples, having the best capacitive ability. All Cu 1– z Mn 1+ z O 2 crednerite samples gave typical faradaic pseudocapacitive behavior because the galvanostatic charge–discharge (GCD) curves at different current densities of 1, 2, 5, 10, and 20 A/g are asymmetric (Figure S18), and the potentials of the charge–discharge platform are nearly the same as the redox potential in their CV curves. , In particular for the sample 055–85, a long charge–discharge time observed in GCD curves at each current density means a maximum capacitance storage per unit mass.…”

Fibrous and flexible electrodes comprising hierarchical nanostructure graphene for supercapacitors

“…Supercapacitors, also known as ultracapacitors, as promising energy storage devices have higher power density, faster rates of charge–discharge than batteries and fuel cells and much larger energy density than traditional capacitors and can bridge the gap between these devices [1–3]. Supercapacitors are categorised as electrical double layer capacitance (EDLC), pseudo‐capacitance, based primarily on mechanisms of energy storage [4–7]. EDLCs are efficient, long lasting and high power energy storage devices, in which energy is stored at the interfacial region of an electron conductor/an ionic conductor via reversible adsorption of ions at the electron conductor surface.…”