Promoting Photocatalytic Hydrogen Evolution Activity of Graphitic Carbon Nitride with Hole‐Transfer Agents

Abstract

Visible light‐driven photocatalytic reduction of protons to H 2 is considered a promising way of solar‐to‐chemical energy conversion. Effective transfer of the photogenerated electrons and holes to the surface of the photocatalyst by minimizing their recombination is essential for achieving a high photocatalytic activity. In general, a sacrificial electron donor is used as a hole scavenger to remove photogenerated holes from the valence band for the continuation of the photocatalytic hydrogen (H 2 ) evolution process. Here, for the first time, the hole‐transfer dynamics from Pt‐loaded sol−gel‐prepared graphitic carbon nitride (Pt‐sg‐CN) photocatalyst were investigated using different adsorbed hole acceptors along with a sacrificial agent (ascorbic acid). A significant increment (4.84 times) in H 2 production was achieved by employing phenothiazine (PTZ) as the hole acceptor with continuous H 2 production for 3 days. A detailed charge‐transfer dynamic of the photocatalytic process in the presence of the hole acceptors was examined by time‐resolved photoluminescence and in situ electron paramagnetic resonance studies.

Interfacial Electronic Effects in Co@N-Doped Carbon Shells Heterojunction Catalyst for Semi-Hydrogenation of Phenylacetylene

“…As a result, the contact interface of the heterostructure plays an important role in catalytic reactions. Inspired by the above elaborations, we strive to take a simple route to construct a N-doped carbon-supported metal Mott-Schottky-type catalyst that possesses high catalytic activity in selective hydrogenation of phenylacetylene [41][42][43][44][45].…”

Self‐Supported Electrocatalysts for Practical Water Electrolysis

“…[9,10] From this perspective, an appealing alternative approach is to split water to produce only clean H 2 and oxygen (O 2 ) gas through thermocatalytic, photocatalytic, or electrocatalytic techniques. [11][12][13] Within them, electrocatalytic water splitting has become the worldwide research focus recently as this technology can produce environmental-friendly highpure H 2 energy from electricity, as well as can be combined with other intermittent energy, such as wind and solar energy, elevating the utilization efficiency of the overall sustainable energy system. [14,15] The fundamental half-reactions which take place on a water electrolyzer involve hydrogen evolution reaction (HER) at the cathode and oxygen evolution reaction (OER) at the anode.…”

Ni2P NPs loaded on methylthio-functionalized UiO-66 for boosting visible-light-driven photocatalytic H2production

“…In order to investigate the effect of different sacrificial agents on the photocatalytic activity of Ni 2 P/UIOS, the photocatalytic experiments of 5 wt% Ni 2 P/UIOS in methanol, triethanolamine, and ascorbic acid sacrificial agents were implemented. 56 In Fig. S7 † it was directly seen that 5 wt% Ni 2 P/UIOS composites were less active in a weakly basic 10 vol% triethanolamine (TEOA) as well as a neutral 10 vol% methanol solution, while the activity was higher in an acidic ascorbic acid solution.…”