Visible-Light-Driven Photoelectrochemical and Photocatalytic Performance of NaNbO3 /Ag2 S Core-Shell Heterostructures.
Herein, we report the fabrication of visible-light-active NaNbO3 /Ag2 S staggered-gap core-shell semiconductor heterostructures with excellent photoelectrochemical activity toward water splitting, and the degradation of a model pollutant (methylene blue) was also monitored. The heterostructures show a pronounced photocurrent density of approximately 2.44 mA cm(-2) at 0.9 V versus Ag/AgCl in 0.5 m Na2 SO4 and exhibit a positive shift in onset potential by approximately 1.1 V. The high photoactivity is attributed to the efficient photoinduced interfacial charge transfer (IFCT). The core-shell design alleviates the challenges associated with the electron-hole paths across semiconductor junctions and at the electrolyte-semiconductor interface. These properties demonstrate that NaNbO3 /Ag2 S core-shell heterostructures show promising visible-light photoactivity and are also efficient, stable, and recyclable photocatalysts.
Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India.|Department of Chemistry, University of Delhi, Delhi, 110007, India.
Sandeep
S
Kumar
Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India.
Aadesh P
AP
Singh
Institute of Nano Science & Technology, Habitat Centre, Phase - X, Sector - 64, Mohali, Punjab, 160062, India.
Chandan
C
Bera
Department of Chemistry, University of Delhi, Delhi, 110007, India.
Meganathan
M
Thirumal
Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India.
B R
BR
Mehta
Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India.|Institute of Nano Science & Technology, Habitat Centre, Phase - X, Sector - 64, Mohali, Punjab, 160062, India.
Ashok K
AK
Ganguli
D055664:Electrochemical Techniques; D004578:Electron Spin Resonance Spectroscopy; D008027:Light; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009556:Niobium / Q000737:chemistry*; D055668:Photochemical Processes; D033362:Powder Diffraction; D018030:Silver Compounds / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*
D018030:Silver Compounds; C559961:sodium niobate; D009556:Niobium; D012964:Sodium; C013251:silver sulfide
electrochemistry; energy conversion; nanostructures; semiconductors; water splitting