A ternary Ag/TiO2/CNT photoanode for efficient photoelectrochemical water splitting under visible light irradiation |
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Authors: | Deepti Chaudhary Simrjit Singh VD Vankar Neeraj Khare |
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Affiliation: | Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India |
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Abstract: | A ternary Ag/TiO2/CNT photoanode was prepared by grafting Ag nanoparticles on the surface of as-synthesized TiO2/CNT nanocomposite for the photoelectrochemical (PEC) water splitting under visible light irradiance. The ternary composite photoanode was observed to generate four times higher photocurrent density compared to binary TiO2/CNT nanocomposite under visible light irradiance. The Ag nanoparticles on the surface of nanocomposite act as a surface plasmon resonance (SPR) photosensitizer under visible light. The enhanced photocurrent density of Ag/TiO2/CNT ternary photoanode is attributed to the increased light absorption in the visible region, decrease in band-bending and effective interfacial electron transfer due to the synergetic effect of Ag nanoparticles and CNTs. The enhanced charge transfer within the Ag/TiO2/CNT was also confirmed by the electrochemical impedance spectroscopy. This work demonstrates a feasible route to improve the PEC performance of TiO2 towards water splitting under sunlight irradiation. |
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Keywords: | Carbon nanotubes Nanocomposite Photoelectrochemical water splitting |
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