Controllable CO₂ Reduction or Hydrocarbon Oxidation Driven by Entire Solar via Silver Quantum Dots Direct Photocatalysis

Abstract

The current solar‐chemical‐industry based on semiconductor photocatalyst is impractical. Metal catalysts are extensively employed in thermal‐ and electro‐catalysis industries, but unsuitable for direct‐driven photocatalysis. Herein, silver quantum dots (Ag‐QDs) are synthesized on support via an in situ photoreduction method, and in situ photocatalysis temperature programmed dynamics chemisorption desorption analyses are designed to demonstrate that Ag‐QDs should be the actual photocatalytic sites. The surface plasmon resonance of Ag‐QDs could harvests entire visible solar, and the plasmon‐driven charge‐transfer exhibits opposite directions at the interface when supports are different. Consequently, Ag‐QDs could be alternatively regulated as oxidation or reduction active centers. Furthermore, Ag‐QDs excite electron tunneling transfer with adsorbate, which does not generate high‐energy free‐radical intermediates. As a result, the efficiencies of hydrocarbon photooxidation and CO2 photoreduction are improved in several orders of magnitude. Evidently, the Ag‐QDs direct photocatalytic technology greatly promotes solar‐chemical‐industry applications.

Temperature‐Dependent Photoredox Catalysis for CO2 Reduction Coupled with Selective Benzyl Alcohol Oxidation over ZnIn2S4/In2O3 Heterostructure

“…The environmental crisis has gained global attention with the ever-increasing CO 2 emissions caused by the over-consumption of fossil fuels. [1][2][3][4] Within this context, reducing CO 2 into value-added chemicals, such as CO, CH 4 , CH 3 OH, or syngas through photocatalysis, [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] thermocatalysis, [25][26][27] and electrocatalysis [28][29][30][31][32] is of great environmental, energy, and economic interests. Especially, photocatalysis, an environmentally friendly and recyclable process, has become the worldwide research focus on the promotion of CO 2 reduction reaction (CO 2 RR).…”

Recent Advances in the Reverse Water–Gas Conversion Reaction

“…In many CO 2 utilization technologies, CO 2 produces a variety of high−value basic chemicals through catalytic conversion, a process that has been widely studied by researchers. CO 2 catalytic conversion technology mainly includes thermal catalysis [6][7][8][9], photocatalysis [10,11], electrocatalysis [12,13], and so on. The research on CO 2 catalytic conversion mainly focuses on CO 2 catalytic hydrogenation.…”