Ag2S nanoparticle promoted charge separation and transfer in g-C3N4 nanosheets for efficient photo and electro chemical performance

Xu, Baogang; Wang, Bo; Zhang, Hongyu; Yang, Ping

doi:10.1016/j.jece.2023.109567

Cited by 6 publications

(1 citation statement)

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“…Basu et al incorporated nanostructures of Ag/Ag 2 S into the silver wire, examined its electrochemical activity, and found the reactive Ag-H ads sites in the Ag/Ag 2 S heterostructure to be responsible for active hydrogen interaction. Zu et al found an effective decrement in the band gap of g-C 3 N 4 by adding Ag 2 S. In electrochemical impedance spectroscopy, it is observed that the charge transfer resistance (Rct) decreases for g-C 3 N 4 with the inclusion of Ag 2 S. Jiang et al proposed the photoactive conduction mechanism between g-C 3 N 4 and Ag 2 S in a photoelectrochemical cell. At heterojunctions, the electrons from the conduction band (CB) of g-C 3 N 4 that transferred toward the conduction band (CB) of Ag 2 S provide the Ag-adsH + (adsH + = hydrogen adsorption sites) sites for H 2 production.…”

Section: Introductionmentioning

confidence: 99%

Empowering the Nickel Iron Oxyhydroxide through a Heterostructure Cocatalyst for Superior Alkaline and Saline Water Reduction

Susikumar,

John,

Mani

et al. 2024

ACS Appl. Energy Mater.

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Hydrogen production using an electrochemical cell might be an alternative to conventional fuel systems (i.e., fossil fuels). The NiFe-layered hydroxide (NiFeO x H y ) is one of the most popular electrocatalysts for water-splitting applications. However, its electrochemical activity is limited in the hydrogen evolution reaction (HER) because of its minimal active sites and modest charge transfer rates. To overcome the limitations in NiFeO x H y , silver sulfide (Ag 2 S) and graphitic carbon nitride (g-C 3 N 4 ) were added as heterostructure cocatalysts. The heterostructure cocatalyst (Ag 2 S/g-C 3 N 4 ) addition in NiFeO x H y is found to improve the electrochemical double layer capacitance (EDLC) seven times greater than that of pristine NiFeO x H y . The addition of the heterostructure cocatalyst in the NiFeO x H y sample enables hydrogen production with a minimum overpotential of η 10 = 43 mV and Tafel slope of 131 mV/ dec in saline water conditions. X-ray photoelectron spectroscopy reveals that the heterostructure cocatalyst effectively donates electrons to NiFeO x H y , which enhance the resultant charge transfer ability of the electrocatalyst. In addition, the density functional theoretical (DFT) analysis suggests that the exposed sulfur (S) sites within the Ag 2 S/g-C 3 N 4 heterostructure cocatalyst serve as the prominent catalytic center for H* interactions. This study highlights the alteration of charge transfer dynamics in NiFeO x H y via heterostructure cocatalyst addition as an effective way to facilitate enhanced alkaline and saline water reduction. KEYWORDS: heterostructure cocatalyst addition, NiFeO x H y , Ag 2 S/g-C 3 N 4 , hydrogen production, saline medium

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Section: Introductionmentioning

confidence: 99%