Fabrication of Dandelion-like p–p Type Heterostructure of Ag₂O@CoO for Bifunctional Photoelectrocatalytic Performance

Abstract

A novel three-dimensional purple dandelion-like hierarchical Ag2O@CoO heterojunction with an appropriate redox potential was constructed by chemical precipitation of Ag2O nanoparticle on flower-like CoO. By feat of this hierarchical structure, the Ag2O@CoO photocathode showed significantly high photoelectroreduction activities toward p-nitrophenol (p-NP) and Cr­(VI). The high performance of Ag2O@CoO was mainly attributed to the specific structural characteristics and synergistic effect of each chemical component. This hierarchical structure could effectively increase the specific surface area, provide more exposed active edges, and be beneficial for multiple light reflection/scattering channels and light utilization efficiency. The introduction of Ag2O optimized the composition and further improved the band structure, resulting in an improved separation of photogenerated electrons and holes. The unique photocathode achieves a removal efficiency of 86% for photoelectrocatalytic p-NP degradation after 120 min and 95% for Cr­(VI) after 40 min under visible light irradiation with excellent stability. This research provided a simple way for the synthesis of photoelectrocatalytic material with potential applications in the field of environmental governance with visible light illumination.

Turning UV Light-Active BiOF into Visible Light-Active BiOF by Forming a Heterojunction with g-C3N4 and Its Photoelectrochemical Water Splitting Performance in Reverse Osmosis-Rejected Wastewater

“…In addition, the obtained charge carrier densities of g-C 3 N 4 , BiOF, and 6% g-C 3 N 4 /BiOF are 1.93, 2.12, and 2.56 × 10 23 , respectively. The alleviated charge carrier density of 6% g-C 3 N 4 /BiOF portrays that the heterojunction of g-C 3 N 4 and BiOF endorses the charge carrier migration . To examine the charge-transfer ability of the electrode materials at the electrode/electrolyte interface in 0.5 M NaOH, electrochemical impedance spectroscopy (EIS) was performed under dark, front, and back light illumination conditions (Figure A–C).…”

“…The alleviated charge carrier density of 6% g-C 3 N 4 /BiOF portrays that the heterojunction of g-C 3 N 4 and BiOF endorses the charge carrier migration. 54 To examine the charge-transfer ability of the electrode materials at the electrode/electrolyte interface in 0.5 M NaOH, electrochemical impedance spectroscopy (EIS) was performed under dark, front, and back light illumination conditions (Figure 8A−C). The Nyquist plot of 6% g-C 3 N 4 / BiOF displays a lower resistance of charge transfer (R ct ), 10.27 kΩ, compared to g-C 3 N 4 (15.23 kΩ) and BiOF (12.85 kΩ) under front light illumination.…”

Silver Oxide-Decorated Silica Nanoparticles for Visible-Light-Driven Photolytic Pollutant Degradation and Water–Oil Separation

“…Taking RhB as a model pollutant, we found that in the presence of 1 sun illumination (100 mW/cm 2 ), SODSNs can remove ∼97% RhB from the solution in just 180 s, and within 300 s, the amount of RhB goes below 1%. These numbers are very promising compared to other reports of Ag 2 O nanoparticles alone or any hybrid structures of Ag 2 O. ,,,,,− These nanoparticles can easily be coated onto various substrates like glass, silicon, cotton cloth, sponge, and tissue paper. The flexibility of coating and multifunctional properties of these SODSNs make them a promising candidate for versatile applications.…”

Construction of an S-Scheme Ag2MoO4/ZnFe2O4 Nanofiber Heterojunction for Enhanced Photoelectrocatalytic Activity under Visible Light Irradiation

“…16 The rate of electron (e − ) and hole (h + ) recombination is decreased by using an appropriate external bias voltage, which effectively improves the efficiency of PEC. 17 The advantages of the photoelectrocatalytic technique are the use of solar energy, low cost, and environmental protection. 18 Under light conditions, semiconductors generate e − from the valence band (VB) to the conduction band (CB).…”