Nickel-based cocatalysts for photocatalytic hydrogen production

A review on g-C3N4 for photocatalytic water splitting and CO2 reduction

“…Solar fuel generation through water splitting and CO 2 photoreduction over photocatalysts has great potential to supply the renewable energy for the future and alleviate the environmental issues [1][2][3][4][5][6][7][8]. However, the positive Gibbs free energy change, 237 kJ mol -1 for water splitting to H 2 and 1135 kJ mol -1 for CO 2 photoreduction to CH 4 , makes the solar hydrogen production and CO 2 photoreduction be thermodynamically unfavorable reactions [9][10][11].…”

“…g-C 3 N 4 is a visible-light-response material ( 2.7 eV bandgap), and the energy position of CB and VB is at -1.1 and 1.6 eV vs normal hydrogen electrode (NHE), respectively [14]. In addition, g-C 3 N 4 has very high resistance to attack from M a n u s c r i p t 4 heat, strong acid, and strong alkaline solution [20]. Unlike the metal-containing photocatalysts that need expensive metal salts for preparation, g-C 3 N 4 photocatalyst can be facilely prepared by thermally polycondensing the cheap N-rich precursors, such as dicyanamide, cyanamide, melamine, and urea [14,21,22].…”

Hierarchical MoS2–rGO nanosheets with high MoS2 loading with enhanced electro-catalytic performance

“…TiO 2 ) functioning as electron collector and active adsorption sites. [1][2] Secondly, MoS 2 can be used counter electrodes materials for dye-sensitized solar cells due to its applicable electro-catalytic activity towards triiodide reduction. [3][4] Under an external potential bias, the redox capability of MoS 2 can be enhanced to be effective used in photo-electrochemical cells.…”

Facile one-pot synthesis of nickel-incorporated titanium dioxide/graphene oxide composites: Enhancement of photodegradation under visible-irradiation

“…Since metals have lower Fermi level than TiO 2 , photo-excited electrons can be transferred from the TiO 2 conduction band to metal particles on the surface while positive holes are contained in the valence band. The process inhibits electron-hole recombination, and hence accelerates photocatalytic reactions [4,10]. Bae and Choi [11] reported that dye-sensitizer metal (ruthenium) and noble metal deposition on TiO 2 could enhance the photodegradation of trichloroacetate with  > 420 nm.…”