Construction of Hexameric Ru-Substitution POMs to Improve Photocatalytic H₂ Evolution

Abstract

Converting solar energy into storable hydrogen energy by employing green photocatalytic technology offers a reliable alternative for meeting the energy crisis. The polyoxometalates are a promising candidate for hydrogen production photocatalysts because of their unique electronic and structural properties and controllable design at the molecular level. Introducing noble metals was proven to be an effective method to greatly enhance the photocatalytic efficiency of polyoxometalates. Herein, two unprecedented compounds of hexameric Ru-POMs, Na 2), were successfully self-assembled. The H 2 evolution rates of 1 and 2 under optimal conditions were 3578.75 and 3027.69 μmol h −1 g −1 with TONs of 255 and 205, respectively. The stability of 1 was demonstrated by a series of characterizations. Besides, a possible photocatalytic mechanism was proposed.

A High Nucleus Cu-Incorporated Giant Phosphotungstate with Photocatalytic Oxidation C–H of Toluene

“…Ultraviolet photoemission spectroscopy (UPS) was utilized to calculate the work function (Φ) and the HOMO energy levels of 1 (Figure c). In the UPS energy spectrum of 1 , E 1 and E 2 denote a cutoff energy of 18.47 eV and an onset energy of 3.61 eV, respectively . Therefore, the work function of 1 was obtained as 2.75 eV (based on Φ = h ν – E 1 , h ν = 21.22 eV) .…”

Cd0.9La0.1S/graphdiyne type-II heterojunction structure for efficient photocatalytic hydrogen production

“…To solve this problem, researchers in recent years have used heterostructure design, doping and other techniques to reduce the rate of recombination of the carriers, thereby increasing the hydrogen production capacity of photocatalysts. 15–17…”