Amorphous Core–Shell Nanoparticles as a Highly Effective and Stable Battery‐Type Electrode for Hybrid Supercapacitors

Abstract

Herein, a silver@amorphous nickel–cobalt hydroxide (Ag@NCOH) battery‐type electrode with the morphology of core–shell nanoparticle is successfully fabricated through coordination etching and precipitating route. This electrode exhibits excellent electrochemical performance, including superior specific capacity (≈718.1 C g−1 at 1 A g−1), excellent rate capability (71.9% capacity retention at 30 A g−1), as well as good cycling stability (83.2% capacity retention over 4000 cycles) for hybrid supercapacitors. According to the results of the characterization analysis and systematic electrochemical testing, the Ag nanoparticles in core–shell structure can significantly enhance the conductivity and accelerate the rate of electron transport. Meanwhile, the nanostructures and grain boundaries of amorphous hydroxide materials can effectively improve to expose the electrochemical active sites to electrolyte. Moreover, the hybrid supercapacitor assembled from Ag@NCOH and active carbon (AC) exhibits good performance (energy density of 39.88 W h kg−1 at power density of 375 W kg−1) and superior cycling stability (85.39% capacitance retention over 9000 cycles). This work demonstrates an effective strategy to construct highly effective and stable amorphous electrode materials for hybrid supercapacitors.

Electrohydrodynamic Printing of Ultrafine and Highly Conductive Ag Electrodes for Various Flexible Electronics

“…Silver pattern electrodes are used in a wide variety of advanced flexible electronics, including organic field effect transistors (OFETs), [1][2][3] organic light emitting diodes (OLEDs), [4][5][6] transparent heaters, [7,8] and energy storage devices. [9][10][11] The rapid development of FEs have inspired great interest in skin-sensing electronics, including soft robots and biocompatible sensors. [12,13] The human body's senses will be greatly DOI: 10.1002/admt.202300080 expanded by electronic devices that fit to the skin.…”

Unveiling the potential of nanosheet-based NiTe2@MnTe hollow nanospheres in hybrid supercapacitor technology

“…5f, NMT-HS displays a battery-like nature, given the ‘ b ’ values of the anode and cathode peaks calculated to be 0.5273 and 0.5192, respectively. The relative contributions of diffusion-controlled and capacitive-controlled processes can be distinguished by the following relationship: 63,64 I (V) = k 1 ν + k 2 ν 1/2 in this equation, k 2 ν 1/2 and k 1 ν represent contributions from diffusion-controlled and surface-capacitive processes, respectively. Fig.…”

“…5f, NMT-HS displays a battery-like nature, given the 'b' values of the anode and cathode peaks calculated to be 0.5273 and 0.5192, respectively. The relative contributions of diffusion-controlled and capacitive-controlled processes can be distinguished by the following relationship: 63,64…”