Splitting of water into hydrogen and oxygen under visible light is an emerging phenomenon in green energy technology. Nevertheless, selecting of an appropriate photocatalyst is rather significant to enhance the...
Here, we develop a series of hybrid Ag@g-C 3 N 4 /r-GO nanocomposite materials that are highly active, durable, and adaptable for electro-and photocatalytic H 2 generation under visible light by employing a rapid and simple sonochemical technique. Multiple catalytic behaviors can be achieved through the strategic introduction of Ag metal into a hierarchical structure consisting of photo-and electroactive two-dimensional (2D) sheets with various band configurations. The outcomes of this work show the development of heterojunctions and show how electro-and photocatalysis were both synergistically improved. The fabricated materials were examined for photocatalytic hydrogen evolution, photoelectrocatalytic (PEC) hydrogen evolution, and electrocatalytic hydrogen evolution reaction (HER). In both photocatalytic conditions at 1.5 AM simulated light irradiation and electrocatalytic conditions, silver-doped composites showed better activity. Among all of the fabricated catalysts, the Ag 20% @g-C 3 N 4 /r-GO (A 20 CNG) catalyst displayed the highest apparent quantum yield (AQY) of 1.69 and the highest hydrogen generation rate (954 μmol g −1 h −1 ). However, in the case of electrocatalysis, Ag 15% @g-C 3 N 4 /r-GO (A 15 CNG) showed impressive HER activity with a low overpotential (η) of 0.484 V at 10 mA cm −2 current density with 130.6 mV dec −1 Tafel slope value and also exhibited approximately 16 times more current density than that of g-C 3 N 4 /GO (CNGO) at a fixed overpotential in the HER process; this was also supported by the electrochemical active surface area (ECSA). On the basis of the impressive results shown above, the Ag@g-C 3 N 4 /r-GO (ACNG) catalyst might be a promising and flexible nanocomposite for photo-, photoelectro-, and electrocatalytic hydrogen evolutions. This is the first study to our knowledge that provides the results of a comprehensive examination into the photo-and electrocatalytic application of an interesting and versatile bifunctional catalyst.
Here, we report the fine-tuned Donor-π-Acceptor concept based Zinc-porphyrin sensitized TiO2 photocatalyst for photochemical hydrogen evolution application. The newly designed system showed unprecedented photocatalytic activity. The molecular structure comprises of...
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