Selective Photothermal Reduction of CO₂ to CO over Ni-Nanoparticle/N-Doped CeO₂ Nanocomposite Catalysts

Abstract

Photothermal reverse water gas shift reaction is one of the promising methods to palliate global energy and environmental issues. Searching for catalysts with high activity and CO selectivity for CO 2 conversion has been attracting extensive attention. In this work, Ni nanoparticleloaded N-doped CeO 2 (Ni/N-CeO 2 ) composite catalysts were synthesized using a three-step method. Under light irradiation, the optimal Ni/N 5.0 -CeO 2 exhibited a CO yield rate of 20.9 mmol• g cat −1 •h −1 with almost 100% of CO selectivity via photothermal CO 2 reduction. As a comparison, Ni/CeO 2 , without nitrogen doping, showed a high CH 4 selectivity. The strong light absorption of Ni/N 5.0 -CeO 2 mainly by loading of Ni nanoparticles and the enhanced adsorption/activation of CO 2 molecules due to increased oxygen vacancies in N 5.0 -CeO 2 by N-doping were supposed to account for the excellent catalytic performances. The doping of nitrogen was of particular importance for the formation of N−H bonds, which could modulate the reaction pathway for promoting the reduction of CO 2 toward CO while suppressing the undesirable CO 2 methanation process.

Localized surface plasmon resonance effect enhanced Cu/TiO2 core–shell catalyst for boosting CO2 hydrogenation reaction

“…As shown in Fig. 8, the intermediates appeared with the reaction: monodentate carbonate ( m -CO 3 2− , 1519 and 1457 cm −1 ), 19,53,54 bicarbonate (HCO 3 − , 1650 and 1540 cm −1 ), 54–56 CO 2 − (1681 cm −1 ), 27 and chelating bridging carbonate ( c -CO 3 2− , 1704 cm −1 ). 17 The bands detected at 1558 cm −1 and 1509 cm −1 could be assigned to the asymmetric vibration of the formate OCO group 57 and CO stretching, 58,59 respectively.…”

“…Photothermal catalytic systems are considered to be one of the most promising ways to achieve solar fuels under mild conditions. 2,9,15,16 Many transition metal nanoparticles such as Fe, 17 Co, 7,18 Ni, 19,20 and Cu [21][22][23] have been reported to have RWGS photothermal catalytic activity, but still face the problem of low product selectivity with the main by-product being CH 4 .…”

Nickel-Laden Dendritic Plasmonic Colloidosomes of Black Gold: Forced Plasmon Mediated Photocatalytic CO2 Hydrogenation

“…When DPC-C4-Ni was compared with some of the best-reported photocatalysts (plasmonic and semiconducting) for CO 2 to CO conversion, − we found that DPC-C4-Ni shows a high production rate and high stability (Figure S24 and Table S1). Our catalyst showed 2464 ± 40 mmol g Ni –1 h –1 CO production, i.e., ∼182 times higher (in the flow) (Table S1), using only light without any external heating.…”

The Mars–Van Krevelen cycle and non-noble metal Ni jointly promoting Z-scheme charge transfer: a study on the photothermal synergy effect applied in selectively oxidizing aromatic alcohols

“…15 Recently, many researchers loaded Ni on the photothermal catalyst CeO 2 ; the photoactivation effect and enrichment of electrons from Ni as well as the heating effect from solar light could increase the surface temperature of the catalyst, thus stabilizing the photothermal performance. 16,17 Ni, as a non-precious metal, also acted as an electron transfer channel.…”