%0 Journal Article
%A Shaikshavali Petnikota
%A Rodney Chua
%A Karunakara Moorthy Boopathi
%A Rohit Satish
%A Francesco Bonaccorso
%A Vittorio Pellegrini
%A Madhavi Srinivasan
%B Journal of The Electrochemical Society
%D 2020
%G eng
%N 10
%P 100514
%R 10.1149/1945-7111/ab971e
%T An Insight into the Electrochemical Activity of Al-doped V<sub>2</sub>O<sub>3</sub>
%V 167
%8 06/2020
%! J. Electrochem. Soc.
%X <p><span>We design Al-doped V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;(Al</span><sub><span>x</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>) compounds as cathodes of aluminium battery. A citric acid-assisted simple solid-state synthesis is used to produce Al</span><sub><span>x</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;compounds by heating, at different temperature, a reaction mixture of NH</span><sub><span>4</span></sub><span>VO</span><sub><span>3</span></sub><span>, Al(NO</span><sub><span>3</span></sub><span>)</span><sub><span>3</span></sub><img src="https://ej.iop.org/icons/Entities/centerdot.gif" alt="centerdot" align="absmiddle" /><span>9H</span><sub><span>2</span></sub><span>O and citric acid under Ar flow. Al-doping in-between layers and at lattice sites of V</span><span>2</span><span>O</span><span>3</span><span>&nbsp;is confirmed by structural, vibrational and chemical analyses. The doped compounds obtained at 600 °C and 800 °C are confirmed as Al</span><sub><span>0.56</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;and Al</span><sub><span>0.53</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;corresponding to theoretical capacities 488 and 490 mAh g</span><sup><span>−1</span></sup><span>, respectively, for the extraction of doped Al by considering three electron transfer (Al/Al</span><sup><span>3+</span></sup><span>). The as-synthesized Al</span><sub><span>x</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;compounds are tested as cathodes in aluminium battery with 1.0 M AlCl</span><sub><span>3</span></sub><span>:[EMIM]Cl electrolyte. The electrodes of Al</span><sub><span>0.56</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;and Al</span><sub><span>0.53</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;exhibited the first charge capacity of 415 and 385 mAh g</span><sup><span>−1</span></sup><span>, respectively. The electrochemical extraction of doped Al is confirmed by comparisons with bare V</span><span>2</span><span>O</span><span>3</span><span>&nbsp;control cathodes and post-cycling structural studies. The extraction of doped Al from Al</span><sub><span>x</span></sub><span>V</span><sub><span>2</span></sub><span>O</span><sub><span>3</span></sub><span>&nbsp;indicates its promising use in high capacity cathode for Al-ion battery.</span></p>