Highly oriented hematite nanorods arrays for photoelectrochemical water splitting

Efficient water oxidation using α-Fe2O3 thin films conformally coated on vertically aligned titania nanotube arrays by atomic layer deposition

“…It's seen that in the dark the electrode shows a small anodic current, which might come from the capacitive nature of the electrode, considering that α-Fe 2 O 3 exhibits pseudocapacitance in alkaline solutions [19]. The turn-on potential for water oxidation was observed to be around 1.65 V, which is comparable to the previous reports on hematite electrodes deposited on FTO substrates [4][5][6]13,14]. This implies that the presence of TNTs does not significantly increase the electrode resistance.…”

“…Many attempts have recently been made to improve PEC performance of hematite-based photoanodes [5][6][7][8][10][11][12][13][14][15]. With "cauliflower-like" mesoporous hematite thin films, Gratzel and coworkers have achieved a benchmark water oxidation photocurrent of 2.2 mA cm À 2 at 1.23 V versus reversible hydrogen electrode (RHE) [5,6].…”

“…Wang et al developed new homojunction/ heterojunction and dual-absorber concepts and successfully reduced the onset potential of water oxidation by 4 200 mV [3]. Since vertically aligned arrays of nanowires (NWs) have been demonstrated both theoretically and experimentally to be able to decouple light absorption and charge collection [9], hematite nanostructure arrays synthesized by different methods were recently extensively studied in the hope of overcoming the trade-off between light absorption and charge collection [10][11][12][13][14][15]. However, many of such hematite nanostructure array electrodes still exhibit unfavorable PEC performance, having a photocurrent well below 1 mA cm À 2 at 1.23 V vs. RHE.…”

Synthesis of Porous Europium Oxide Particles for Photoelectrochemical Water Splitting

“…Photoelectrochemical (PEC) water splitting over semiconductor metal oxides has attracted numerous interests [2][3][4][5][6][7][8], because it is a promising and environmentally friendly method to produce hydrogen [9][10][11][12][13][14][15]. Among various metal oxides, transition metal oxides, such as TiO 2 [13,16], ZnO [17][18][19], Fe 2 O 3 [20], In 2 O 3 [21], have been extensively investigated as photoelectrodes for PEC water splitting, and remarkable progresses have been achieved [22,23].…”

Hierarchical self-assembled structures based on nitrogen-doped carbon nanotubes as advanced negative electrodes for Li-ion batteries and 3D microbatteries

“…1g; iii) Iron hydroxide nanorods were then grown on the surface of the NCNTs via a hydrothermal process. This step is similar to the study by de Carvalho et al [32], however, some modifications were carried out to achieve the growth of highly oriented hematite nanorod arrays on the substrate. Applying similar experimental conditions in the autoclave without including a carbon paper support yields a reduced number of iron hydroxide rods and the latter display also lower quality.…”