Photocatalytic CO<sub>2</sub> reduction of C/ZnO nanofibers enhanced by an Ni-NiS cocatalyst

Deng, Hongzhao; Xu, Fei; Cheng, Bei; Wang, Yuanyuan; Ho, Wingkei

doi:10.1039/c9nr10451h

Cited by 88 publications

(34 citation statements)

References 62 publications

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“…13 C and 16 O, respectively. This result confirms that CO is indeed derived from CO 2 reduction over MCZ-2 rather than any other carbon source 42 , 43 . In addition, the total ion chromatographic signals around 2.67 and 3.55 min are assigned to O 2 and N 2 , respectively (Supplementary Fig.…”

Section: Resultssupporting

confidence: 77%

Sustained CO2-photoreduction activity and high selectivity over Mn, C-codoped ZnO core-triple shell hollow spheres

et al. 2021

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Solar conversion of CO2 into energy-rich products is one of the sustainable solutions to lessen the global energy shortage and environmental crisis. Pitifully, it is still challenging to attain reliable and affordable CO2 conversion. Herein, we demonstrate a facile one-pot approach to design core-triple shell Mn, C-codoped ZnO hollow spheres as efficient photocatalysts for CO2 reduction. The Mn ions, with switchable valence states, function as “ionized cocatalyst” to promote the CO2 adsorption and light harvesting of the system. Besides, they can capture photogenerated electrons from the conduction band of ZnO and provide the electrons for CO2 reduction. This process is continuous due to the switchable valence states of Mn ions. Benefiting from such unique features, the prepared photocatalysts demonstrated fairly good CO2 conversion performance. This work is endeavoured to shed light on the role of ionized cocatalyst towards sustainable energy production.

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Section: Resultssupporting

confidence: 77%

Sustained CO2-photoreduction activity and high selectivity over Mn, C-codoped ZnO core-triple shell hollow spheres

et al. 2021

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“…Furthermore, control experiments manifest that no detectable products are observed (either in the dark or under light irradiation) in absence of the photocatalyst and/or CO 2 , suggesting that CH 3 OH and CO are indeed generated from CO 2 photocatalytic reduction. 46,47 Isotopic labeling experiment (Fig. 5a) strongly con rms that the carbon-based products are indeed derived from CO 2 reduction and not from any other carbon source.…”

Section: Photocatalystmentioning

confidence: 62%

Sustained CO2-photoreduction activity and high selectivity over C, Mn-codoped ZnO core-triple shell hollow spheres

Sayed

Kuang

Low

et al. 2020

Preprint

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Solar conversion of CO2 into energy-rich products is one of the sustainable solutions to lessen the global energy shortage and environmental crisis. Pitifully, it is still challenging to attain reliable and affordable CO2 conversion. Herein, we demonstrate a facile one-pot approach to design core-triple shell Mn, C-codoped ZnO hollow spheres as efficient photocatalysts for CO2 reduction. The Mn ions, with switchable valance states, function as “ionized cocatalyst” to promote the CO2 adsorption and light harvesting of the system. Besides, they can capture photogenerated electrons from the conduction band of ZnO and provide the electrons for CO2 reduction. This process is continuous due to the switchable valence states of Mn ions. Benefiting from such unique features, the prepared photocatalysts demonstrated remarkably selective CO2 conversion into CH3OH (yielding ten times higher than that of commercial ZnO). This work is endeavoured to shed light on the role of ionized cocatalyst towards sustainable energy production.

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“…[ 156 ] In addition, nickel sulfide (NiS) with rich active site and favorable light absorption often served as a co‐catalyst to replace noble metals to further facilitate reaction activity in the field of solar energy conversion. [ 157 ] More recently, NiS 2 QDs were implanted into g‐C 3 N 4 to construct closely‐contacted hybrids via a seed‐mediated growth strategy. The 3.8‐fold improvements on CO production efficiency with a rate of 10.68 µmol g −1 h −1 for NiS 2 QDs/g‐C 3 N 4 may be attributed to the accelerated separation of photogenerated carriers and enrichment of surface reactive sites offered by NiS 2 QDs.…”

Section: Binary Metal Sulfide Photocatalystsmentioning

confidence: 99%

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO₂ Reduction Application

Wang

Lin

Tian

et al. 2020

Adv Funct Materials

282

170

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Solar‐driven conversion of CO2 into high value‐added fuels is expected to be an environmental‐friendly and sustainable approach for relieving the greenhouse gas effect and countering energy crisis. Metal sulfide semiconductors with wide photoresponsive range and favorable band structures are suitable photocatalysts for CO2 photoreduction. This review summarizes the recent progress on metal sulfide semiconductors for photocatalytic CO2 reduction. First, the fundamentals, mechanisms and some principles, like product selectivity, of photocatalytic CO2 reduction are introduced. Then, according to the elemental composition, the metal sulfide photocatalysts applied for CO2 reduction are classified into binary (CdS, ZnS, MoS2, SnS2, Bi2S3, In2S3,Cu2S, NiS/NiS2, and CoS2), ternary (ZnIn2S4, CdIn2S4, CuInS2, Cu3SnS4, and CuGaS2), and quaternary (Cu2ZnSnS4) systems, in which their crystal structures, photochemical characteristics, and photocatalytic CO2 reduction applications are systematically demonstrated. Especially, the diverse modification strategies for improving the activity and product selectivity of photocatalytic CO2 reduction on these metal sulfides are summarized. Finally, the current challenges and future directions for the development of metal sulfide photocatalysts for CO2 reduction are proposed. This review is expected to serve as a powerful reference for exploiting high‐efficiency metal sulfide photocatalysts for CO2 conversion and furthering related mechanism understanding.

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Photocatalytic CO₂ reduction of C/ZnO nanofibers enhanced by an Ni-NiS cocatalyst

Abstract: Photocatalyst Ni-NiS/C/ZnO shows improved photocatalytic CO2-reduction activity due to enhanced light absorption, good CO2 adsorption and effective charge separation.

Cited by 88 publications

References 62 publications

Sustained CO2-photoreduction activity and high selectivity over Mn, C-codoped ZnO core-triple shell hollow spheres

Sustained CO2-photoreduction activity and high selectivity over Mn, C-codoped ZnO core-triple shell hollow spheres

Sustained CO2-photoreduction activity and high selectivity over C, Mn-codoped ZnO core-triple shell hollow spheres

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO₂ Reduction Application

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Photocatalytic CO2 reduction of C/ZnO nanofibers enhanced by an Ni-NiS cocatalyst

Abstract: Photocatalyst Ni-NiS/C/ZnO shows improved photocatalytic CO2-reduction activity due to enhanced light absorption, good CO2 adsorption and effective charge separation.

Cited by 88 publications

References 62 publications

Sustained CO2-photoreduction activity and high selectivity over Mn, C-codoped ZnO core-triple shell hollow spheres

Sustained CO2-photoreduction activity and high selectivity over Mn, C-codoped ZnO core-triple shell hollow spheres

Sustained CO2-photoreduction activity and high selectivity over C, Mn-codoped ZnO core-triple shell hollow spheres

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO2 Reduction Application

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Photocatalytic CO₂ reduction of C/ZnO nanofibers enhanced by an Ni-NiS cocatalyst

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO₂ Reduction Application