Defect-mediated ionic hopping and green electricity generation in Al2−xMgxO3-based hydroelectric cell
Source abstract
Abstract
A direct evidence of enhanced water molecule splitting by increasing defect concentration in Al2−xMgxO3 hydroelectric cells (HECs) has been elaborated for green electricity generation. Existence of F, F+ and [Mg]0 defect centers in nanoporous Al2−xMgxO3 (x = 0–0.5) cell pellets has been confirmed by optical spectroscopy. Increased defect density from ~ 1.45 × 1015 cm−3 to 5.4 × 1016 cm−3 induced by increasing Mg doping concentration is found to be a key factor to control water molecule dissociation/splitting at alumina surface. Small polaron hopping-assisted ionic conduction for enhanced current density is analyzed by impedance spectroscopy. The maximum, 15 mA, current is obtained in Al2−xMgxO3 HEC for x = 0.5 concentration resulting in 13.5 mW off-load peak output power as compared to 4.95 mW peak output power in pure alumina HEC. A theoretical modeling of Nyquist spectra analyzes ion–solid interaction for real charge transfer process in HEC. Deliberate defect creation in alumina devised for water molecule dissociation at room temperature paves the way to fabricate a facile green electricity generation source in the form of HEC. Al2−xMgxO3-based hydroelectric cell is a very low-cost device to generate green electricity besides providing eco-friendly by-products without use of photocatalytic activity, acid/alkali or electrolyte. Moreover, presented innovative alumina-based HEC would be a big step for mitigating industrial waste consisting of alumina. Polaron assisted hopping of OH− ions in the lattice of Al2-xMgxO3 HEC and green electricity generation in the form of V-I plot.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (50)
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