Vertically aligned TiO2/(CdS, CdTe, CdSTe) core/shell nanowire array for photoelectrochemical hydrogen generation

Current progress in developing metal oxide nanoarrays-based photoanodes for photoelectrochemical water splitting

“…The VLS/VS growth has been well developed and often used for 1D metal oxide synthesis with high-quality crystallinity. Recently, several comprehensive reviews on 1D metal oxide nanomaterials synthesized by the VLS/VS growth can be found in the literature [28][29][30][31][32][33][34][35].…”

“…Some physical methods such as CVD [39,207] and PVD [30,185] also were utilized to synthesize the heterojunction array structures. For example, Ai et al [30] reported that the type-II TiO 2 / CdS, TiO 2 /CdTe and TiO 2 /CdS x Te 1-x heterostructured core/shell nanowire arrays on FTO substrates were synthesized via PVD of CdS, CdTe and the alloyed CdS x Te 1-x layer onto the hydrothermally pre-grown TiO 2 nanowire arrays. Zhong et al [39] adopted a twostep CVD method to prepare a dense array of ZnO-ZnGa 2 O 4 coreshell nanowires.…”

CdS/Zr:Fe2O3 Nanorod Arrays with Al2O3 Passivation Layer for Photoelectrochemical Solar Hydrogen Generation

“…[3] The conduction band edge of a-Fe 2 O 3 is below that of the H + /H 2 redox potential, leading to the need for an external bias for H 2 generation. [9][10][11][12][13] Thus far,m any heterostructures have been fabricated as photoanodes,s uch as TiO 2 /CdSe, [14] TiO 2 /CdS x Te 1Àx , [15] ZnO/CdS, [16a,b] CdS/ZnIn 2 S 4 / TiO 2 , [17] ZnO/CdSe, [18] ZnO/Zn x Cd 1Àx Te,e tc. [4] In recent decades, considerable efforts were made toward improvingt he photoconversion efficiency of a-Fe 2 O 3 by photocatalyst modification.T he modificationsw ere made with either doping the a-Fe 2 O 3 with metals such as Ti,N i, Sn, Co Cu, Cd, Zr, [5a,b,c,d] or through formation of nanocomposites, and heterojunctions.…”

“…[6][7][8] Recent studies demonstrated that the heterojunction of metal oxides with metal chalcogenides could be an effective way to harvest visible light and promote charge separation, leading to ah igh photocatalytic efficiency for H 2 generation. [9][10][11][12][13] Thus far,m any heterostructures have been fabricated as photoanodes,s uch as TiO 2 /CdSe, [14] TiO 2 /CdS x Te 1Àx , [15] ZnO/CdS, [16a,b] CdS/ZnIn 2 S 4 / TiO 2 , [17] ZnO/CdSe, [18] ZnO/Zn x Cd 1Àx Te,e tc. [19] In fact, it is worth noting that such types of heterojunctions facilitatet he extension of light absorption into the visible light region and enhances photocatalytic activity.…”

A Molecular Relay‐Modified CdS‐Sensitized Photoelectrochemical Cell for Overall Water Splitting

“…As a result, a sacrificial Na 2 S/Na 2 SO 3 electrolyte is generally used, in which the sodium salts act as hole scavengers to protect the semiconductor sensitizer from photocorrosion. With this electrolyte, several TiO 2 /semi‐conductor heterojunctions have been studied for use in hydrogen generation, such as CdS, CdSe, CdS x Te 1− x , CdS x Se 1− x , and CdS/CdSe, and high photocurrent densities have been achieved due to the excellent light harvesting properties of the semiconductor sensitizers.…”