Effect of Mg-Zn-Mo-O nanoparticles supported on carbon quantum dot and graphitic carbon nitride for improving electrochemical hydrogen storage

The development of electrode materials for energy storage is an important request for providing novel active materials. Co-precipitation synthesized nanostructured magnesium zinc molybdate (Mg-Zn-Mo-O) along with graphitic carbon nitride (g-C3N4) and carbon quantum dot (CQD) form ternary nanocomposite for applying in the hydrogen storage systems in terms of electrochemical storage mechanism. Carbon quantum dot materials produce by a novel natural source of Salix aegyptiaca through the green synthesis method. The ternary nanocomposites of Mg-Zn-Mo-O/g-C3N4 /CQD apply as hydrogen storage material and compare with binary nanocomposites of Mg-Zn-Mo-O/g-C3N4 and Mg-Zn-Mo-O/CQD in the electro-chemical charge-discharge chronopotentiometry tests. The resultant discharge profiles show the maximum capacity of 202 mA h g(-1 )after 15 cycles for Mg-Zn-Mo-O/g-C3N4 /CQD composites while the maximum capacity for Mg-Zn-Mo-O/g-C3N4 and Mg-Zn-Mo-O/CQD is 250 and 162 mA h g(-1). The capacity of pure Mg-Zn-Mo-O nanoparticles is 112 mA h g(-1). Therefore, the resultant ternary nanocomposites are promising active materials for hydrogen storage application. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, nanostructured magnesium zinc molybdate was synthesized through co-precipitation and combined with graphitic carbon nitride and carbon quantum dot to form a ternary nanocomposite for hydrogen storage systems. The results showed that the ternary nanocomposite exhibited promising electrochemical storage performance.