Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

Xie, Junwei; Li, Yijun; Nie, Denggen; Wang, Leiyu; Chen, Jing; Li, Bing; He, Jianbo; Guo, Zhenguo; Lau, Tai‐Chu

doi:10.1039/d2qi01259f

Cited by 4 publications

(3 citation statements)

References 56 publications

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“…To identify the active sites for HER, LSV measurements of the Pt 2 Co 3 /NC‐950 catalyst were performed in the presence of thiocyanate ion (SCN − ), which can block the active sites of noble metals via strong coordination [44] . As shown in Figure S11, the LSV curves of the Pt 2 Co 3 /NC‐950 electrocatalyst exhibit a drastic cathodic shift in the presence of SCN − .…”

Section: Resultsmentioning

confidence: 99%

In Situ Generation of Pt₂Co₃ Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

Wang

Liu

et al. 2023

ChemCatChem

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Platinum (Pt) catalysts are the state-of-the-art electrocatalysts for hydrogen evolution reaction (HER), but it is still a challenge to improve the utilization efficiency and stability of Pt-based catalysts. Herein, Pt 2 Co 3 nano-alloys anchored on the surface of the N-doped carbon support are precisely synthesized via metal complex-controlled pyrolysis. Benefiting from the formation and exposure of the bimetallic nano-alloys, the optimal Pt 2 Co 3 / NC-950 electrocatalyst exhibits an extraordinary HER catalytic activity and stability. To achieve a current density of 10 mA cm À 2 , the Pt 2 Co 3 /NC-950 electrocatalyst requires small overpotentials of 12 mV in both acidic and alkaline media with small Tafel slopes of 6 mV dec À 1 and 24 mV dec À 1 in 0.5 M H 2 SO 4 and 1 M KOH, respectively, which is superior to the commercialized Pt/C catalyst. Additionally, the much higher turnover frequencies and the larger electrochemical surface areas of Pt 2 Co 3 /NC-950 further reveal its superior catalytic active sites. Based on theoretical calculations, the outstanding HER activity is found to be attributed to the synergic effect of the Pt and Co components that optimizes the adsorption Gibbs free energy of hydrogen atom and accelerates water dissociation in alkaline media.

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Section: Resultsmentioning

confidence: 99%

In Situ Generation of Pt₂Co₃ Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

Wang

Liu

et al. 2023

ChemCatChem

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“…To further verify this, CaEuCAM and CaEuCAM@Fe 3+ were further analyzed by X-ray photoelectron spectroscopy (XPS). The survey spectrum indicates the existence of Eu, Ca, Fe, O, N, and C elements 79 in CaEuCAM@ Fe 3+ (Figure S17a). The binding energy of O 1s in CaEuCAM is found to be 531.4 and 532.8 eV (Figure S17b), which moved toward higher binding energies of 531.7 and 533.5 eV in CaEuCAM@Fe 3+ .…”

Section: Sensing Of 3-npmentioning

confidence: 99%

A Multifunctional Ca^II–Eu^III Heterometallic Organic Framework with Sensing and Selective Adsorption in Water

Li,

Jin,

Yang

et al. 2024

Inorg. Chem.

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With increasing global industrialization, it is urgent and challenging to develop multifunctional species for detection and adsorption in the environment. For this purpose, a novel anionic heterometallic organic framework, [, is hydrothermally synthesized based on chelidamic acid (H 3 CAM). Single crystal analysis shows that CaEuCAM features two different oxygenrich channels along the c-axis in which one CAM 3− bridges two sextuplecoordinated Ca 2+ and two octuple-coordinated Eu 3+ with a μ 4 -η 1 : η 1 : η 1 : η 1 : η 1 : η 1 new chelating and bridging mode. The characteristic bright red emission and superior hydrostability of CaEuCAM under harsh acidic and basic conditions benefit it by acting as a highly sensitive sensor for Fe 3+ and 3nitrophenol (3-NP) with extremely low LODs through remarkable quenching. The combination of experiments and theoretical calculations for sensing mechanisms shows that the competitive absorption and interaction are responsible for Fe 3+ -induced selective emission quenching, while that for 3-NP is the result of the synergism of host−guest chemistry and the inner filter effect. Meanwhile, the assimilation of negative charge plus channels renders CaEuCAM a highly selective adsorbent for methylene blue (MB) due to a synergy of electrostatic affinity, ion-dipole interaction, and size matching. Of note is the reusability of CaEuCAM toward Fe 3+ /3-NP sensing and MB adsorption besides its fast response. These findings could be very useful in guiding the development of multifunctional Ln-MOFs for sensing and adsorption applications in water media.

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“…It has been investigated that loading of a metallic cocatalyst, especially plasmonic metallic nanoparticles, can accelerate the rate of H 2 production by diminishing the electron-hole recombination at the semiconductor-metal interface . The CdS heterostructures along with metallic cocatalysts such as Au, Ag, Pt, Pd, and Ru have shown promising H 2 production via the photocatalytic water splitting mechanism. − Among plasmonic metals, especially Ag and Au nanoparticles have an edge due to plasmons’ improved light-harvesting and charge separation property. Moreover, intense plasmon absorbance facilitates the photosensitization by introducing their hot electrons in oscillation with the incident solar light. , However, prominent Pt metallic nanoparticles have been widely explored as cocatalysts for proton reduction owing to their large work function, low hydrogen overpotential, and lowest Fermi energy level. , These cocatalysts play an essential role in water splitting reactions and accelerate hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Plasmon-Induced and Multichannel Electron Transfer-Improved Photocatalytic Hydrogen Production by CdS–Au–Pt Heterostructure

Kotkondawar

Moinuddin

Rayalu

2023

ACS Appl. Energy Mater.

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Light-driven charge separation efficiency has prime importance in semiconductorassisted water splitting reactions for dihydrogen production. A profound electron(e − )-hole(h + ) separation can be achieved by a multicomponent hybrid and with the rapid hole-scavenging mechanism of the sacrificial reagent. In this context, a Pt/Au/CdS hetero-nanostructure has been synthesized and evaluated for photocatalytic hydrogen production with a sulfide shuttle as the sacrificial agent under λ > 300 nm of illumination. Hexagonal-cubic core−shell CdS nanostructures with dendrite architecture were prepared by a facile hydrothermal technique and metallic Au/Pt was impregnated with the photodeposition method. The photodeposition strategy facilitates uniform dispersion of metallic particles on the CdS surface, wherein each component has close contact with others. The plasmonic gold nanoparticles (Au NPs) in the hybrid nanostructure amplify the lightharvesting ability due to its pronounced surface plasmon resonance and also provide multiple "hot electron" injection channels. These electron transfer channels, i.e., Au to CdS, CdS to Pt, and Au to Pt, enhance the cocatalyst effect of Pt. Pt 0.72 /Au 0.28 /CdS exhibited the highest H 2 production of 15 mmol•h −1 •g −1 with an apparent quantum efficiency (AQE) of 4.20% (λ = 420 nm) using aqueous Na 2 SO 3 −Na 2 S solution as the sacrificial agent. Herein, sulfide shuttles vitalized the hydrogen production efficiency by effectively scavenging the generated hole and its intrinsic photolytic mechanism also provided molecular hydrogen. The present work demonstrated a promising efficiency of multichannel electron transfer pathways in amelioration of hydrogen production. Simultaneously, the dual advantages of the Na 2 SO 3 −Na 2 S shuttle offer a unique opportunity for application of sulfide-containing wastewater as the sacrificial agent in a photocatalytic hydrogen production framework.

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Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

Abstract: Semiconductors are usually employed to construct photocatalysts for H2 production, but bare semiconductors often suffer from a high recombination rate of charge carriers, resulting in low activity for proton reduction....

Cited by 4 publications

References 56 publications

In Situ Generation of Pt₂Co₃ Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

In Situ Generation of Pt₂Co₃ Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

A Multifunctional Ca^II–Eu^III Heterometallic Organic Framework with Sensing and Selective Adsorption in Water

Plasmon-Induced and Multichannel Electron Transfer-Improved Photocatalytic Hydrogen Production by CdS–Au–Pt Heterostructure

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Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

Abstract: Semiconductors are usually employed to construct photocatalysts for H2 production, but bare semiconductors often suffer from a high recombination rate of charge carriers, resulting in low activity for proton reduction....

Cited by 4 publications

References 56 publications

In Situ Generation of Pt2Co3 Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

In Situ Generation of Pt2Co3 Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

A Multifunctional CaII–EuIII Heterometallic Organic Framework with Sensing and Selective Adsorption in Water

Plasmon-Induced and Multichannel Electron Transfer-Improved Photocatalytic Hydrogen Production by CdS–Au–Pt Heterostructure

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In Situ Generation of Pt₂Co₃ Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

In Situ Generation of Pt₂Co₃ Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

A Multifunctional Ca^II–Eu^III Heterometallic Organic Framework with Sensing and Selective Adsorption in Water