A selectively decorated Ti-FeOOH co-catalyst for a highly efficient porous hematite-based water splitting system

Abstract

We report an efficient Ti-doped FeOOH (Ti-FeOOH) co-catalyst applied on SiOx thin layer coated Ti-doped porous Fe2O3 (Ti-PH) to realize an excellent water splitting photoelectrochemical cell.

Hematite Photoanode with Complex Nanoarchitecture Providing Tunable Gradient Doping and Low Onset Potential for Photoelectrochemical Water Splitting

“…The differentt hickness is also confirmed by the higher intensity of the (110)p lane XRD reflection for H2 compared with H1 ( Figure S2), which also suggests ap referential growth of H1 and H2 along the (110)c rystallographic direction, the most conductive and desirable for PEC water splitting. [6,9] Strikingly,t he surfacea tomicc oncentration of Sn 4 + in H2 (1.50 %) is 2.4times lower than that of H1 (3.56 %). [6,9] Strikingly,t he surfacea tomicc oncentration of Sn 4 + in H2 (1.50 %) is 2.4times lower than that of H1 (3.56 %).…”

“…The atomicc oncentration of Ti in H2 (0.95 %) is similar,w ithin the experimental sensitivity of the instrument, to the one found in H1 (0.76 %), in agreement with synthetic conditions where the same concentration of Ti dopant in the precursor solution was used ( Figure 1e and Table S1). [6,9] Strikingly,t he surfacea tomicc oncentration of Sn 4 + in H2 (1.50 %) is 2.4times lower than that of H1 (3.56 %). This is attributed to the different thickness of H2 and H1 a-Fe 2 O 3 films.…”

“…[1,2] Semiconductors used in PEC cells split water into oxygen and hydrogen gas by using photoexcited electron-hole pairs (EHP), separated through the formationo ft he space-charge layer (SCL) at the solid/liquid interface. [5,6] Many n-type semiconductors with suitable band-gap energy for absorbing solar light, such as TiO 2 , [7] ZnO, [8] a-Fe 2 O 3 , [9] BiVO 4 , [10] Ta 3 N 5 , [11] and WO 3 , [12] have been extensively investigated as photoanodes for PEC water splitting. [5,6] Many n-type semiconductors with suitable band-gap energy for absorbing solar light, such as TiO 2 , [7] ZnO, [8] a-Fe 2 O 3 , [9] BiVO 4 , [10] Ta 3 N 5 , [11] and WO 3 , [12] have been extensively investigated as photoanodes for PEC water splitting.…”

“…[3,4] The overall water splitting can be divided into two half reactions, namely,t he oxygen evolution reaction (OER, 2H 2 O + 4h + !O 2 + 4H + )a nd the hydrogen evolution reaction (HER, 4H + + 4e À !2H 2 ), occurring at the photoanode anda t the photocathode, respectively. [5,6] Many n-type semiconductors with suitable band-gap energy for absorbing solar light, such as TiO 2 , [7] ZnO, [8] a-Fe 2 O 3 , [9] BiVO 4 , [10] Ta 3 N 5 , [11] and WO 3 , [12] have been extensively investigated as photoanodes for PEC water splitting. In particular, a-Fe 2 O 3 (i.e.,h ematite) is considered ap romising photoanode materialowing to ab and gap of 2.1 eV,e arth-abundance, simple fabricationp rocessing, enhanced stabilitya gainst chemical and PEC corrosion,a nd superior theoretical solar-to-hydrogen (STH) efficiency (15.3 %).…”

High-efficiency colorful perovskite solar cells using TiO2 nanobowl arrays as a structured electron transport layer

“…The fabrication procedure was similar to that for the planar PSCs except using TiO 2 NB array instead of the compact TiO 2 layer as the ETL. Moreover, a thin layer of SiO 2 was deposited onto the TiO 2 NB array by a simple approach using (3-aminopropyl)trimethoxysilane (APTMS) solution following the reported method [41]. After calcination in air at 500°C for 30 min, the SiO 2 -coated TiO 2 NB arrays were directly used for the deposition of the perovskite layer.…”