Self-assembly induction of reduced graphene oxide decorated CdS nanoboxes for photocatalytic hydrogen evolution

Wei, Mingzhi; Li, Qiancheng; Ma, Ding; Guo, Erjun; Lu, Qifang; Zhang, Xuetao; Pang, Yingping

doi:10.1039/d2se00616b

Cited by 2 publications

(3 citation statements)

References 64 publications

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“…The stretching vibration modes of C–O groups and CC bonds in the GO skeleton is largely indicated by the bands at 1023 and 1623 cm –1, respectively, while this skeletal band due to CC stretching is shifted to 1627 cm –1 in rGO in the composite. Also, the bands’ disappearance at 1720 cm –1 due to the carbonyl group stretching in rGO suggests the successful reduction of GO during the chemical process. , Another less intense band observed at 539 and 644 cm –1 in the coating is attributed to Co–O stretching from the nanocomposite used for coating . All of these observations suggest the successful formation of the CoO/rGO composite before the CoO/rGO-Ni 2 P coating formation.…”

Section: Resultsmentioning

confidence: 89%

“…Also, the bands' disappearance at 1720 cm −1 due to the carbonyl group stretching in rGO suggests the successful reduction of GO during the chemical process. 23,32 Another less intense band observed at 539 and 644 cm −1 in the coating is attributed to Co−O stretching from the nanocomposite used for coating. 21 All of these observations suggest the successful formation of the CoO/rGO composite before the CoO/rGO-Ni 2 P coating formation.…”

Section: Resultsmentioning

confidence: 99%

“…In the first step, graphene oxide (GO) is successfully synthesized from graphite powder (Sigma-Aldrich, 99.90%) oxidation by the modified Hummers method (Supporting Information). 23 In the second step, CoO/rGO nanocomposite is prepared by the hydrothermal reduction method. 1 Proper exfoliation of GO (0.1 g) is achieved by ultrasonication in DI water (40 mL) containing 20 mL of ethanol for 20 min.…”

Section: Introductionmentioning

confidence: 99%

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Development of Cobalt Oxide-Decorated Reduced Graphene Oxide-Supported Nickel Alloy Coating for Efficient Photocatalytic Hydrogen Generation

Meera,

Anil,

Bhagya

et al. 2023

ACS Appl. Energy Mater.

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Being a narrow band gap semiconductor, the photocatalytic activity of bare Ni 2 P is highly limited. However, a proper band gap tuning of Ni 2 P through effective composite formation furnishes a fruitful strategy for developing active photocatalytic materials. In this regard, the present work reports the application of an efficient photocatalytic ternary composite in the form of a coating formed from CoO/rGO and Ni 2 P. The simultaneous reduction of GO to rGO disperses crystalline CoO nanoparticles in it. The CoO-embedded rGO nanosheet can act as an efficient conducting material that helps to mediate the redox reactions in CoO and Ni 2 P. CoO/rGO enriches the catalytically active sites in the Ni 2 P surface with an improvement in the surface topography. Moreover, the possibilities of interactions such as hydrogen bonding among the oxygen functional groups in CoO/rGO, with phosphorus in Ni 2 P, lead to an intimate contact among them for the fast electronic movement for proton reduction. Consequently, the CoO/rGO-Ni 2 P composite coating displays a benchmark performance for solar-driven hydrogen generation and produces 4.98 mmol/g hydrogen for 1 h irradiation after a successful compositional tuning. The long-lasting activity and excellent stability of the composite coating, even after 15 cycles, are attributed to the additional role of Ni 2 P as a catalyst support bed for CoO/rGO which can impart stability to the entire catalyst system.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Cobalt Oxide-Decorated Reduced Graphene Oxide-Supported Nickel Alloy Coating for Efficient Photocatalytic Hydrogen Generation

Meera,

Anil,

Bhagya

et al. 2023

ACS Appl. Energy Mater.

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Triggering the Interplay of sp²–sp³ Carbon-Assisted Sustained Tribofilm via Two-Dimensional Surface Modulation for Exceptional Wear Resistance of Steel Surfaces

Shafna,

Meera,

Jubiya Fathima

et al. 2024

Langmuir

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The relentless wear and friction of steel-based moving machinery have created ongoing challenges that hinder their industrial applications. One promising solution is the use of reduced graphene oxide (rGO) as a lubricant due to its excellent mechanical strength and promising tribological properties. However, its tendency to self-agglomerate presents a major hurdle for its practical use. This study aims to combat the restacking of rGO nanosheets by strategically intercalating self-assembled α-ZrP between the rGO layers, unlocking exceptional wear resistance in mild steel through hot-dip galvanization. The multilayer architecture of the developed coatings ensures lubrication through layer slippage during friction, while the coexistence of sp 2 − sp 3 hybridized carbons further extends wear life, with the Zn-0.22/ZP_5@G coating exhibiting the highest wear resistance (0.277 × 10 −7 mm 3 N −1 m −1 ). The as-tailored composite coating, featuring a tribolayer composed of graphitic sp 2 carbons, ZrO 2 , Zr(PO 4 ) 2 , and Fe 2 O 3 , serves as an effective dissipative medium for contact stress. The formation of diamond-like sp 3 carbons induced by the tribological process further contributes to the increased hardness of the resulting tribofilm. The reduced generation of the π-conjugated system in the composite prevents the movement of electrons toward the cathodic site, while the passivation effect induced by the composite effectively inhibits electrolyte permeation, resulting in substantial corrosion resistance. The exemplary wear resistance with remarkable anticorrosion performance achieved in this study offers significant improvement in the realm of hard coatings for mechanical applications, including moving machinery and manufacturing. Hence, the system can find effective use in such industries following the completion of relevant case studies.

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Self-assembly induction of reduced graphene oxide decorated CdS nanoboxes for photocatalytic hydrogen evolution

Abstract: Solar-driven photocatalytic hydrogen evolution promises a bright future in responding to energy issues and environmental emergencies. Herein, we report a reduced graphene oxide decorated CdS (rGO-CdS) photocatalyst with hollow nanobox...

Cited by 2 publications

References 64 publications

Development of Cobalt Oxide-Decorated Reduced Graphene Oxide-Supported Nickel Alloy Coating for Efficient Photocatalytic Hydrogen Generation

Development of Cobalt Oxide-Decorated Reduced Graphene Oxide-Supported Nickel Alloy Coating for Efficient Photocatalytic Hydrogen Generation

Triggering the Interplay of sp²–sp³ Carbon-Assisted Sustained Tribofilm via Two-Dimensional Surface Modulation for Exceptional Wear Resistance of Steel Surfaces

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Self-assembly induction of reduced graphene oxide decorated CdS nanoboxes for photocatalytic hydrogen evolution

Abstract: Solar-driven photocatalytic hydrogen evolution promises a bright future in responding to energy issues and environmental emergencies. Herein, we report a reduced graphene oxide decorated CdS (rGO-CdS) photocatalyst with hollow nanobox...

Cited by 2 publications

References 64 publications

Development of Cobalt Oxide-Decorated Reduced Graphene Oxide-Supported Nickel Alloy Coating for Efficient Photocatalytic Hydrogen Generation

Development of Cobalt Oxide-Decorated Reduced Graphene Oxide-Supported Nickel Alloy Coating for Efficient Photocatalytic Hydrogen Generation

Triggering the Interplay of sp2–sp3 Carbon-Assisted Sustained Tribofilm via Two-Dimensional Surface Modulation for Exceptional Wear Resistance of Steel Surfaces

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Triggering the Interplay of sp²–sp³ Carbon-Assisted Sustained Tribofilm via Two-Dimensional Surface Modulation for Exceptional Wear Resistance of Steel Surfaces