Hexagonal CdS assembled with lamellar NiCo LDH form S-scheme heterojunction for photocatalytic hydrogen evolution

Jiang, Guoping; Zheng, Chaoyue; Jin, Zhiliang

doi:10.1016/j.mssp.2021.106128

Cited by 16 publications

(2 citation statements)

References 37 publications

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“…73–1520) and Co(OH) 2 (JCPDS card No. 74–1057), due to the similar atomic sizes of Co and Ni in the same crystal structure. − After loading NiCo-LDH on MG, not only the peaks of MG are retained but also the broad diffraction peak occurs at ∼20° due to the poor crystallinity of NiCo-LDH . And it shifts relative to that of pure NiCo-LDH, which would be ascribed to the electron transfer between NiCo-LDH and MG led by their intimate contact.…”

Section: Resultsmentioning

confidence: 99%

“…38 The peaks of pure NiCo-LDH at 19 crystallinity of NiCo-LDH. 51 And it shifts relative to that of pure NiCo-LDH, which would be ascribed to the electron transfer between NiCo-LDH and MG led by their intimate contact. When CdS is further combined with LMG, it shows only the characteristic peaks at 24.81°, 26.51°, 28.18°, 43.68°, 47.84°, and 51.83°indexed to (100), ( 002), ( 101), ( 110), (103), and (112) planes of CdS, respectively, but those peaks of NiCo-LDH and β-Mo 2 C can hardly be observed because of their minimal amount relative to CdS.…”

Section: = + + Y Ymentioning

confidence: 94%

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Accelerated “Electron Converter” Characteristics of NiCo-LDH for a CdS-Carbide Photocatalytic System with a Dual Heterointerface

Ji,

Zhang,

et al. 2024

ACS Sustainable Chem. Eng.

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Accelerating the electron transfer and thus inhibiting recombination of photogenerated carriers hold paramount significance for photocatalytic solar hydrogen generation. Introducing an intermediate transition layer in the Schottky junction structure would modulate the Schottky barrier and thus enhance the separation efficiency of photogenerated carriers. Herein, we insert an efficient NiCo-layered-double-hydroxide (NiCo-LDH) lamina between molybdenum carbide-supported reduced graphene oxide (Mo 2 C/rGO, abbreviated as MG) and CdS, fabricating the sandwich composite CdS@NiCo-LDH@Mo 2 C/rGO (noted as CLMG) for photogenerated hydrogen. The inserted NiCo-LDH enables the dual heterogeneous interface phase of CdS/NiCo-LDH and NiCo-LDH/Mo 2 C and decreases the Schottky barrier of CdS/ Mo 2 C, boosting the electron transfer of CLMG. In addition, the experiments and DFT calculations indicate that the work functions increase in the order of CdS < NiCo-LDH < Mo 2 C. Benefiting from the unique nanoarchitecture of the catalyst, the unidirectional cascade electron transport is realized following the order of CdS → NiCo-LDH → Mo 2 C with NiCo-LDH as an accelerated "electron converter", which eventually expedites the photogenerated electron transfer of CdS to Mo 2 C and boosts carrier separation as well as the hydrogen reduction of the integrated system, achieving a 135 times greater H 2 production rate (58.07 mmol g −1 h −1 ) than pristine CdS (0.43 mmol g −1 h −1 ). Moreover, CLMG exhibits excellent durability.

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