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Architecturally robust tubular nano-clay grafted Li0.9Ni0.5Co0.5O2-x/LiFeO2 nanocomposites: New implications for electrochemical hydrogen storage.

Authors :
Monsef, Rozita
Salavati-Niasari, Masoud
Source :
Fuel. Jan2023:Part 1, Vol. 332, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

[Display omitted] • Nano-engineering of novel LNCO/LFO composites via a controllable combustion route. • Influence of diverse synthesis circumstances was investigated. • HNT served as a supported framework to prevent structural failure. • First report on electrochemical hydrogen storage behavior of resulting nanocomposites. • [HNT-LNCO/LFO5%] platforms showed perfect discharge capacity of 437.34 mAhg−1 after 15 cycles. To meet the demand for sustainable energy development, focusing on storage systems of clean energy like hydrogen is a priority. However, the utilization of new sorbent materials for an in-depth understanding of hydrogen storage mechanisms remains lacking. Herein, a novel composite electrode based on halloysite nanotube-Li 0.9 Ni 0.5 Co 0.5 O 2-x /LiFeO 2 (HNT-LNCO/LFO) nanostructures with superior electrochemical hydrogen storage behavior is developed via two-pot synthesis strategy, in which the HNT bridges with rich active sites serve as a natural clay support for LNCO/LFO electrocatalysts to equip improved hydrogen sorption kinetics through the spillover phenomena and redox coupling effect. Varied parameters, such as fuel types, the molar ratio of fuel to nitrates, the concentration of the LNCO/LFO (mg/ml), and solvent were optimized to prepare HNT-LNCO/LFO nanocomposites with desired purity, structure, and morphology. These physicochemical changes were realized by a combination of X-ray Powder Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), High Resolution Transmission Electron Microscopy (HR-TEM), and Brunauer-Emmett-Teller (BET) analyses. Furthermore, the electrochemical nature of the proposed nanocomposites were probed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry charge–discharge (CCD) process in KOH medium. The effect of conductive LNCO/LFO contents (3.0 %, 5.0 % and 7.0 %) on the HNT substrate was evaluated with the discharge efficiency and hydrogen spillover mechanism. As a consequence, the LNCO/LFO nanoparticles and pristine HNT structures exhibited the hydrogen storage capacities of 499.67 and 84.05 mAhg−1 after 15 cycles, respectively. However, the contribution of LNCO/LFO nanoparticles with weight percent of 3.0 %, 5.0 % and 7.0 % in tubular matrix can produce the discharge efficiencies of 309.33, 437.34 and 132.25 mAhg−1 in three electrode cells, respectively. This systematic work will result in alternative insights of the well-designed HNT-based nanocomposites for highly efficient energy storage applications. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00162361
Volume :
332
Database :
Academic Search Index
Journal :
Fuel
Publication Type :
Academic Journal
Accession number :
159844538
Full Text :
https://doi.org/10.1016/j.fuel.2022.126015