# The Application of Nano Titanium Dioxide for Hydrogen Production and Storage Enhancement
## 3 Conclusions
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Composite**} & \multirow{2}{*}{\begin{tabular}{c} **Hydrogen** \\ **Desorption** \\ \end{tabular} } & \
\begin{tabular}{c} **Hydrogen Desorption** \\ **Properties** \\ **(Time, Temp., Pressure)** \\ \end{tabular} & \multirow{2}{*}{
\begin{tabular}{c} **Hydrogen** \\ **Absorption** \\ **(Time, Temp., Pressure)** \\ \end{tabular} } & \multirow{2}{*}{**Ref.**} \\  & & & & & \\ \hline MgH\({}_{2}\)-TiO\({}_{2}\)/Ti\({}_{3}\)C\({}_{2}\)T\({}_{\rm x}\) & 5.98 wt\% & 600 s, 300 \({}^{\circ}\)C, 0.05 MPa & 5.90 wt\% & 1200 s, 175 \({}^{\circ}\)C, 3 MPa & [13] \\ \hline MgH\({}_{2}\)-Co/TiO\({}_{2}\) & 6.2 wt\% & 10 min, 265 \({}^{\circ}\)C, 0.02 bar & 6.07 wt\% & 10 min, 165 \({}^{\circ}\)C, 60 bar & \\  & 5.4 wt\% & 100 min, 220 \({}^{\circ}\)C, 0.02 bar & 4.24 wt\% & 10 min, 100 \({}^{\circ}\)C, 60 bar & [54] \\  & 4.6 wt\% & 100 min, 210 \({}^{\circ}\)C, 0.02 bar & \(\sim\) 1 wt\% & 10 min, 50 \({}^{\circ}\)C, 60 bar & \\ \hline MgH\({}_{2}\)-Ti\({}_{3}\)C\({}_{2}\)/TiO\({}_{2}\)(A)-C & 5 wt\% & 1700 s, 250 \({}^{\circ}\)C, 0.05 MPa & 4 wt\% & 800 s, 125 \({}^{\circ}\)C, 3 MPa & [55] \\ \hline MgH\({}_{2}\)-3 DOM TiO\({}_{2}\) & 5.75 wt\% & 1000 s, 300 \({}^{\circ}\)C, 0.005 MPa & 4.17 wt\% & 1800 s, 100 \({}^{\circ}\)C, 3 MPa & [56] \\  & 5.74 wt\% & 3000 s, 275 \({}^{\circ}\)C, 0.005 MPa & 5.40 wt\% & 1000 s, 175 \({}^{\circ}\)C, 3 MPa & [56] \\ \hline MgH\({}_{2}\)-TiO\({}_{2}\)@C & 6.5 wt\% & 7 min, 300 \({}^{\circ}\)C, - & 6.6 wt\% & 10 min, 140 \({}^{\circ}\)C, 50 bar & [63] \\ \hline MgH\({}_{2}\)-TiO\({}_{2}\) nanorods & -5.5 wt\% & 5 min, 350 \({}^{\circ}\)C, 0.1 bar & 5.5 wt\% & 10 min, 350 \({}^{\circ}\)C, 10 bar & [64] \\ \hline MgH\({}_{2}\)-Ni/TiO\({}_{2}\) & 5.24 wt\% & 1800 s, 250 \({}^{\circ}\)C, 0.005 MPa & 4.50 wt\% & 120 min, 50 \({}^{\circ}\)C, 3.0 MPa & [65] \\  & 6.08 wt\% & 600 s, 300 \({}^{\circ}\)C, 0.005 MPa & & & \\ \hline MgH\({}_{2}\)-fl-TiO\({}_{2}\)@C & 6.0 wt\% & 7 min, 250 \({}^{\circ}\)C, 1 kPa & 6.3 wt\% & 40 min, 150 \({}^{\circ}\)C, 5 MPa & \\  & 4.9 wt\% & 60 min, 225 \({}^{\circ}\)C, 1 kPa & 5.0 wt\% & 40 min, 100 \({}^{\circ}\)C, 5 MPa & [66] \\  & 3.0 wt\% & 100 min, 200 \({}^{\circ}\)C, 1 kPa & 3.9 wt\% & 40 min, 50 \({}^{\circ}\)C, 5 MPa & \\ \hline MgH\({}_{2}\)-fl-TiO\({}_{2}\) & 6.0 wt\% & 8 min, 250 \({}^{\circ}\)C, 1 kPa & 6.0 wt\% & 40 min, 150 \({}^{\circ}\)C, 5 MPa & \\  & 3.9 wt\% & 60 min, 225 \({}^{\circ}\)C, 1 kPa & & & [66] \\  & 0.9 wt\% & 100 min, 200 \({}^{\circ}\)C, 1 kPa & & & \\ \hline MgH\({}_{2}\)-TiO\({}_{2}\)@rGO & 6.0 wt\% & 6 min, 300 \({}^{\circ}\)C, 0.0004 MPa & 5.9 wt\% & 2 min, 200 \({}^{\circ}\)C, 3 MPa & [67] \\ \hline MgH\({}_{2}\)-TiO\({}_{2}\) nanosheets & 6.0 wt\% & 192 s, 260 \({}^{\circ}\)C, 1 kPa & 6.1 wt\% & 10 s, 150 \({}^{\circ}\)C, 5 MPa & [68] \\  & 1.2 wt\% & 300 min, 180 \({}^{\circ}\)C, 1 kPa & 3.3 wt\% & 10 s, 50 \({}^{\circ}\)C, 5 MPa & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Summary of strategies adopted to improve H\({}_{2}\) storage performance of MgH\({}_{2}\) using TiO\({}_{2}\)-based catalysts. **Author Contributions:** Conceptualization, V.D.M. and M.C. ; writing--original draft preparation, A.D.B. ; writing--review and editing A.D.L., P.P., R.R., V.D.M. and M.C. ; supervision, V.D.M. and M.C. All authors have read and agreed to the published version of the manuscript. **Funding:** [PERSON] kindly acknowledges PRP@CERIC-CUP J97G22000400006 for sponsoring her salary and work. V.D.M. kindly acknowledges Programma Operativo Nazionale (PON) Ricerca e Innovazione 2014-2020-Azione IV.6 \"Contrati su t nematice geren\"-DM 1062/2021 for sponsoring her salary and work. A.D.L. acknowledges PON 2014-2020, Asse I \"Capitale Umano\", \"Dottorati Innovativi on caratterizzazione industriale\", CUP F85F21005780001; and A.D.B. kindly acknowledges Progetto Tsima, CUP F83C21000150001 PNR-MUR. M4C2-Dalla ricerca all'impresa--1.1: Fondo per il Programma Nazionale della Ricerca (PNR) e Progetti di Ricerca di Rilevante Interesse Nazionale (PRIN).