Noble-metal-free Z-Scheme MoS2–CdS/WO3–MnO2 nanocomposites for photocatalytic overall water splitting under visible light

Band Engineering of Semiconducting Microporous Graphitic Carbons by Phosphorous Doping: Enhancing of Photocatalytic Overall Water Splitting

“…Deposition of Cr 2 O 3 (0.13 wt %) on mp-(P)C α was determined by EDS analysis (Figure S22 in the Supporting Information) and TEM images (Figure 9). As expected in view of the activity of transition-metal oxides as cocatalysts for O 2 evolution, 33,34 Figure 9 shows that the photocatalytic activity of Cr 2 O 3 /(P)C α in the presence of Ce IV as an electron acceptor was higher than that of mp-(P)C α under the same conditions.…”

Transition‐Metal‐Based Cocatalysts for Photocatalytic Water Splitting

“…Based on the charge transfer in such a band alignment, redox cocatalysts are site‐selectively photodeposited on the surfaces of different components, thus leading to the formation of spatially separated cocatalysts to suppress the backward reaction in water splitting and improve the charge separation and surface reactions. For example, Li et al [ 410 ] reported that owing to the Z‐scheme charge transfer pathway in the designed CdS/WO 3 heterojunction, using photodeposition, MoS 2 reduction cocatalyst and MnO 2 oxidation cocatalyst were selectively deposited on the surfaces of CdS and WO 3 , respectively ( Figure A–C). Under the synergistic induction of MoS 2 and MnO 2 cocatalysts, the MoS 2 ‐CdS/WO 3 ‐MnO 2 composite showed improved photocatalytic performance for overall water splitting to H 2 and O 2 (Figure 28D).…”

“…) [400] Mn 0. [403] NaTaO 3 Ni NiO UV-Vis (Hg-Xe) Water 625 (H 2 )/300 (O 2 ) --(2018) [404] CdS MoS 2 Co-Pi λ > 420 nm (Xe) Lactic acid 40500 (H 2 ) 36 (420 nm) 20 (2019) [405] g-C (2020) [406] g-C (2021) [407] ZnS@CdS Ni CoO x λ > 420 nm (Xe) Na 2 S/Na 2 SO 3 20300 (H 2 ) -18 (2018) [408] Cd 1Àx Zn x S@WO 3Àx NiO x CoO x λ > 420 nm (Xe) Lactic acid 2825000(H 2 ) 34.6 (420 nm) -(2019) [409] CdS/WO 3 MoS 2 MnO 2 420-800 nm (Xe) Water 0.63 (H 2 )/0.2 (O 2 ) --(2020) [410] CdS CoP MnO x UV-Vis (Xe) Na 2 S/Na 2 SO 3 23840 (H 2 ) -10 (2017) [411] Among these studies, a popular deposition mode is that transition-metal-based reduction and oxidation cocatalysts are randomly loaded on semiconductors to obtain enhanced charge separation and photocatalytic performance. For example, Zheng et al [392] reported that nickel-cobalt phosphide (NiCoP) and phosphate (NiCoPi) as reduction and oxidation cocatalysts were deposited on the CdS surface for photocatalytic H 2 evolution (Figure 27A).…”

“…[398] Copyright 2021, Elsevier. [410] Copyright 2020, Elsevier. E) Schematic illustrating the preparation process of: F) CoO x /ZnS@CdS/Ni; SEM, G) TEM, H,I) HRTEM, and J) elemental mapping images of CoO x /ZnS@CdS/Ni; K) Photocatalytic H 2 evolution activity and L) stability of CoO x /ZnS@CdS/Ni.…”

“…A) TEM and B,C) HRTEM images of both MnO 2 and MoS 2 loaded CdS/WO 3 photocatalyst; D) Schematic illustration of overall photocatalytic water splitting in the MnO 2 and MoS 2 co-loaded CdS/WO 3 . A-D) Reproduced with permission [410]. Copyright 2020, Elsevier.…”