CdS branched TiO2: Rods-on-rods nanoarrays for efficient photoelectrochemical (PEC) and self-bias photocatalytic (PC) hydrogen production

Ni Foam Supported TiO2 Nanorod Arrays with CdS Branches: Type II and Z‐Scheme Mechanisms Coexisted Monolithic Catalyst Film for Improved Photocatalytic H2 Production

“…Moreover, in Figure 7H, according to the fitted equivalent circuit in the electrochemical impedance spectroscopy (EIS), except the small series resistance ( R s ) values of Ni/TiO 2 and Ni/TiO 2 @CdS reflect the advantage conductivity of metal Ni foam, Ni/TiO 2 @CdS possesses the minimum charge transfer resistance ( R ct ) values, which also prove a rapid charge transfer between Ni/TiO 2 @CdS catalyst and the electrolyte (Table S3, Supporting Information). [ 55 ] In addition, the ECSA calculated by the electrochemical double‐layer capacitance ( C dl ) strongly confirms that Ni 3 S 2 species in Ni/TiO 2 @CdS can bring more charges to reaction active sites (Figure 7I and S7, Supporting Information).…”

“…Notably, to improve the inherently limited light absorption and conversion efficiency of TiO 2 , CdS nanorods branched on Ni/TiO 2 nanoarrays were fabricated (Ni/TiO 2 @CdS) according to our previous proposed rods‐on‐rods strategy. [ 55 ] During the PEC and photocatalytic (PC) hydrogen production measurements, it was found that the highest applied bias photo‐to current conversion efficiency (ABPE) and PC H 2 production rate of Ni/TiO 2 @CdS can run up to 4.95% and 13.3 μmol cm −2 h −1 , which, respectively, reaches almost 2.2 times and 22.2 times higher than that of the typical FTO‐supported similar samples (FTO/TiO 2 @CdS). We believed that these Ni foam supported 1D TiO 2 nanorod arrays may provide a new strategy and guideline for seeking their other advantaged multifunctional applications.…”

Ternary Monolithic ZnS/CdS/rGO Photomembrane with Desirable Charge Separation/Transfer Routes for Effective Photocatalytic and Photoelectrochemical Hydrogen Generation

“…Under such alkaline condition, the ZnO seeds dissolve into Zn 2+ and disperse into the synthesis solution. Then, as the solubility product constant (Ksp) of CdS (8.0×10 −27 ) is much smaller than that of ZnS (2.9×10 −25 ), the active S 2+ species preferentially reacts with Cd 2+ ions forming CdS nanorod arrays, with the presence of glutathione capping agent . Moreover, with the consuming of Cd 2+ and the growth of CdS nanorods, Zn 2+ ions are adsorbed onto the top surface of CdS nanorods, due to the present of cation vacancies on the high energy CdS surfaces.…”

“…Then, as the solubility product constant (Ksp) of CdS (8.0 10 À27 )i sm uch smaller than that of ZnS (2.9 10 À25 ), the active S 2 + species preferentially reacts with Cd 2 + ions forming CdS nanorod arrays, with the presence of glutathionec apping agent. [22,23] Moreover,w ith the consuming of Cd 2 + and the growth of CdS nanorods, Zn 2 + ions are adsorbed onto the top surface of CdS nanorods, due to the present of cation vacancies on the high energy CdS surfaces. Finally,a ccording to the Frank-van der Merwe hetero epitaxially growth mechanism, [24] the ZnS caps were in situ epitaxially grown on the top surface of CdS nanorods as shown in the contrast interface area in the HRTEM image.…”

Interfacial Charge Transport in 1D TiO2 Based Photoelectrodes for Photoelectrochemical Water Splitting

“…[ 117 ] 1D/1D CdS branched TiO 2 films indicates that the CdS nanobranches can effectively enhanced the visible light response and charge separation in photoanode. [ 118 ] The mass transfer performance of the CdS branched TiO 2 photoelectrode determines its highest PEC hydrogen production property, with an optimal surface‐to‐volume ratio and sufficient exposing CdS surface. [ 119 ]…”