Strong Magnetic-Field-Engineered Porous Template for Fabricating Hierarchical Porous Ni–Co–Zn–P Nanoplate Arrays as Battery-Type Electrodes of Advanced All-Solid-State Supercapacitors

Abstract

The sluggish charge transport kinetics that exist in the energy storage process of all-solid-state supercapacitors (ASSSCs) can be improved by designing open hierarchical porous structures for binder-free electrodes. Herein, a template-directed strategy is developed to fabricate open hierarchical porous Ni–Co–Zn–P nanoplate arrays (NCZP6T) through phosphating the electrodeposited NiCo–LDH nanosheets loaded on a template. At first, porous conductive NiZn alloy nanoplate arrays are rationally devised as the template by a strong magnetic field (SMF)-assisted electrodeposition. The Lorentz force caused by coupling the SMF with the electrical current induces a magnetohydrodynamic (MHD) flow (including the micro-MHD flow), which homogenizes the deposition coating, tunes the nucleation and growth of the NiZn alloy, and produces pores in the nanoplates. The open hierarchical porous structure offers a larger specific surface area and pore volume for accelerating charge transport and gives a synergistic effect between the inner porous conductive NiZn array template and the outer electrochemical active phosphides for high-performance hybrid ASSSCs. Accordingly, the battery-type electrode of NCZP6T shows a much higher specific capacitance of 3.81 F cm–2 at 1 mA cm–2, enhanced rate capability, and remarkable cycling stability at progressively varying current densities. Finally, the NCZP6T//FeS ASSSC delivers a high energy density of 77 μW h cm–2 at a large power density of 12 mW cm–2, outperforming most state-of-the-art supercapacitors.

Exploring the mechanisms of magnetic fields in supercapacitors: material classification, material nanostructures, and electrochemical properties

“…Furthermore, the same effect can also occur in alloy materials. Liu et al 38 prepared porous conductive NiZn alloy nanoplate arrays as templates (NZ 6T ) using SMF-assisted ED. These templates were used in the preparation of hierarchical porous Ni-Co-Zn-P nanoplate (NCZP 6T ) arrays loaded with highly reactive metal phosphides (Fig.…”

“…The SMF can also assist ED techniques to design electrode assembly devices. For instance, Liu et al 38 used a SMF-assisted ED technique to design porous conductive NiZn alloy nanoplate arrays as templates. Open-layered porous NCZP 6T was prepared by phosphorylating the electrodeposited NiCo-LDH NSs loaded on the template.…”

Synergistic Tuning of Nickel Cobalt Selenide@Nickel Telluride Core–Shell Heteroarchitectures for Boosting Overall Urea Electrooxidation and Electrochemical Supercapattery

“…Based on the enhanced electrocatalytic activity for UOR and overall urea electrolysis as well as the exceptional charge storage performance of bifunctional Ni 6 Co 6 Se@NiTe core-shell heterostructures, the significant features and mechanisms inducing such a high electrochemical activity can be demonstrated as follows: the synergistic effect between 2D Ni 6 Co 6 Se nanosheet arrays and 3D NiTe dendritic frameworks with electron-rich Te and Se species and collaborative effects of Ni and Co electroactive sites and enlarged surface area effectively tune the overall electrochemical properties. [71,72] The direct deposition of active compounds onto conductive current collector improves the interfacial contact and mechanical adhesion between active components and underlying scaffolds and avoids the loss of electroconductivity and "dead volume" induced by the use of binder/additives. [73] Open dendritic frameworks of NiTe core and the highly porous nature of the constructed shell with interconnected nanosheet networks afford enormous accessible centers for facile insertion/extraction of OH − ions and strengthen the UOR as well as Faradaic redox processes.…”

Waste dry cell derived photo-reduced graphene oxide and polyoxometalate composite for solid-state supercapacitor applications

“…Charge storage machinery is classified into three categories: (a) electric double layer capacitance or EDLC (generated by electrostatic charge separation at electrode/electrolyte interface), [8][9][10] (b) a pseudocapacitance or capacitive faradaic process (charge stored via redox reactions within double layers), [11][12][13] and (c) a non-capacitive faradaic process or battery-type charge storage (the faradaic process is governed by the Nernst equation and the storage of ions via intercalation and deintercalation). [14][15][16][17] Graphene oxide (GO), or oxidized graphene, possesses oxygen-containing functional groups with a high surface area and good electrical conductivity. 18,19 It has been extensively explored as a carbon-based 2D electrode material for SCs.…”

“…Charge storage machinery is classified into three categories: (a) electric double layer capacitance or EDLC (generated by electrostatic charge separation at electrode/electrolyte interface), 8–10 (b) a pseudocapacitance or capacitive faradaic process (charge stored via redox reactions within double layers), 11–13 and (c) a non-capacitive faradaic process or battery-type charge storage (the faradaic process is governed by the Nernst equation and the storage of ions via intercalation and deintercalation). 14–17…”