Synthesis and photocatalytic activity of monodisperse single crystalline NiO octahedrons by the selective adsorption of Cl− ions

Liu, Bin; Wei, Anzhi; Zhang, Jianying; An, Lijuan; Zhang, Qiangqiang; Yang, Heqing

doi:10.1016/j.jallcom.2012.06.111

Cited by 12 publications

(4 citation statements)

References 35 publications

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“…Two peaks appear at 853.9 and 872.2 eV in the Ni 2p spectrum (Figure 3A), corresponding to the binding energies of Ni 2+ 2p 3/2 , and 2p 1/2 ; the peaks at 860.1 and 878.8 eV could be attributed to the satellite peaks (Yang et al, 2019;Wu et al, 2020). As shown in Figure 3B, the peak located at 530.6 eV could be attributed to the lattice oxygen of NiO (Wang et al, 2010;Liu et al, 2012;Hu et al, 2018). Figure 3C displays the high-resolution XPS spectra of Cd 3d; the binding energies at 405.2 and 411.9 eV correspond to the Cd 3d 5/2 and Cd 3d 3/2 of the Cd 2+ in CdS nanorods, respectively (Bai et al, 2010;Zhou P. et al, 2017;Behera et al, 2019).…”

Section: Synthesis and Characterizationmentioning

confidence: 92%

NiO Nanosheets Coupled With CdS Nanorods as 2D/1D Heterojunction for Improved Photocatalytic Hydrogen Evolution

et al. 2021

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Designing low-cost, environment friendly, and highly active photocatalysts for water splitting is a promising path toward relieving energy issues. Herein, one-dimensional (1D) cadmium sulfide (CdS) nanorods are uniformly anchored onto two-dimensional (2D) NiO nanosheets to achieve enhanced photocatalytic hydrogen evolution. The optimized 2D/1D NiO/CdS photocatalyst exhibits a remarkable boosted hydrogen generation rate of 1,300 μmol h−1 g−1 under visible light, which is more than eight times higher than that of CdS nanorods. Moreover, the resultant 5% NiO/CdS composite displays excellent stability over four cycles for photocatalytic hydrogen production. The significantly enhanced photocatalytic activity of the 2D/1D NiO/CdS heterojunction can be attributed to the efficient separation of photogenerated charge carriers driven from the formation of p-n NiO/CdS heterojunction. This study paves a new way to develop 2D p-type NiO nanosheets-decorated n-type semiconductor photocatalysts for photocatalytic applications.

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Section: Synthesis and Characterizationmentioning

confidence: 92%

NiO Nanosheets Coupled With CdS Nanorods as 2D/1D Heterojunction for Improved Photocatalytic Hydrogen Evolution

et al. 2021

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“…16 The peak at 530.8 eV corresponds to O 1s. The peaks at 199.4 and 200.8 eV can be assigned to Cl 2p 3/2 and 2p 1/2 , respectively, 35 which might come from the surface Cl − ions of CoO octahedrons. The XPS spectra and EDX analysis suggest that the formation of the CoO octahedrons may originate from the selective adsorption of Cl − ions.…”

Section: Methodsmentioning

confidence: 99%

Charge Separation between Polar {111} Surfaces of CoO Octahedrons and Their Enhanced Visible-Light Photocatalytic Activity

Liu

Ning

et al. 2015

ACS Appl. Mater. Interfaces

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Crystal facet engineering of semiconductors has been proven to be an effective strategy to increase photocatalytic performances. However, the mechanism involved in the photocatalysis is not yet known. Herein, we report our success in that photocatalytic performances of the Cl(-) ion capped CoO octahedrons with exposed {111} facets were activated by a treatment using AgNO3 and NH3·H2O solutions. The clean CoO {111} facets were found to be highly reactivity faces. On the basis of the polar structure of the exposed {111} surfaces, a charge separation model between polar {111} surfaces is proposed. There is an internal electric field between polar {111} surfaces due to the spontaneous polarization. The internal electric field provides a driving force for charge separation. The reduction and oxidation reactions selectively take place on the positive and negative polar {111} surfaces. The charge separation model provides a clear insight into charge transfer in the semiconductor nanocrystals with high photocatalytic activities and offer guidance to design more effective photocatalysts, solar cells, photoelectrodes, and other photoelectronic devices.

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“…To address this issue, organic polymers or inorganic ions have usually been employed for selective control of the growth rates of various crystal planes [2,5,7,12,15,18]. However, these capping agents adsorbed on the surfaces of semiconductor crystals generally reduce the catalytic activity as the result of decrease of the surface energy.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the Cl − ion capped NiO octahedrons with exposed {111} facets were found to have higher intrinsic photocatalytic activity than Degussa P25 TiO 2 particles [18].…”

Section: Introductionmentioning

confidence: 99%

Superior photocatalytic activities of NiO octahedrons with loaded AgCl particles and charge separation between polar NiO {111} surfaces

Liu

Yang

Wei

et al. 2015

Applied Catalysis B: Environmental

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Synthesis and photocatalytic activity of monodisperse single crystalline NiO octahedrons by the selective adsorption of Cl− ions

Cited by 12 publications

References 35 publications

NiO Nanosheets Coupled With CdS Nanorods as 2D/1D Heterojunction for Improved Photocatalytic Hydrogen Evolution

NiO Nanosheets Coupled With CdS Nanorods as 2D/1D Heterojunction for Improved Photocatalytic Hydrogen Evolution

Charge Separation between Polar {111} Surfaces of CoO Octahedrons and Their Enhanced Visible-Light Photocatalytic Activity

Superior photocatalytic activities of NiO octahedrons with loaded AgCl particles and charge separation between polar NiO {111} surfaces

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