Effect of transition metal oxide cocatalyst on the photocatalytic activity of Ag loaded CaTiO3 for CO2 reduction with water and water splitting

Soltani, Tayyebeh; Zhu, Xing; Yamamoto, Akira; Singh, Surya Pratap; Fudo, Eri; Tanaka, Atsuhiro; Kominami, Hiroshi; Yoshida, Hisao

doi:10.1016/j.apcatb.2021.119899

Cited by 97 publications

(53 citation statements)

References 28 publications

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“…Both the bicarbonate and carbonate ions from reactions ( 6) and (7), respectively, are known to be fast acceptors (scavengers) of hydroxyl radicals in water [15] at a constant rate:…”

Section: Chemistryopenmentioning

confidence: 99%

“…The selectivity of the reaction depends on many factors, such as the type of photocatalyst, its crystallinity, introduced modifying elements, type of carrier, and others. [6] In the publication of Soltani et al, [7] selective photocatalysts for hydrogen production with reduction of CO 2 were developed. Obtaining high selectivity to hydrogen is controversial because the hydrogen obtained from the decomposition of water is used immediately to reduce carbon dioxide, and it is challenging to implement in the photocatalytic reduction of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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New Insight on Carbon Dioxide‐Mediated Hydrogen Production**

et al. 2022

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A new approach to hydrogen production from water is described. This simple method is based on carbon dioxide‐mediated water decomposition under UV radiation. The water contained dissolved sodium hydroxide, and the solution was saturated with gaseous carbon dioxide. During saturation, the pH decreased from about 11.5 to 7–8. The formed bicarbonate and carbonate ions acted as scavengers for hydroxyl radicals, preventing the recombination of hydroxyl and hydrogen radicals and prioritizing hydrogen gas formation. In the presented method, not yet reported in the literature, hydrogen production is combined with carbon dioxide. For the best system with alkaline water (0.2 m NaOH) saturated with CO 2 under UV‐C, the hydrogen production amounted to 0.6 μmol h −1 during 24 h of radiation.

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“…Both the bicarbonate and carbonate ions from reactions ( 6) and (7), respectively, are known to be fast acceptors (scavengers) of hydroxyl radicals in water [15] at a constant rate:…”

Section: Chemistryopenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Insight on Carbon Dioxide‐Mediated Hydrogen Production**

et al. 2022

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“…Calcium titanate (CaTiO 3 ) would be a suitable photocatalytic material for the assessment of the possibility of this new reaction system (eq 7), since it has been reported as a photocatalyst for water splitting, 22,23 CO 2 reduction, 5,24 and so on. 25 In this study for the first time, we found that a CaTiO 3 (CTO) photocatalyst loaded with a silver−manganese oxide (Ag−MnO x ) dual cocatalyst enabled the simultaneous production of CO and H 2 O 2 from CO 2 and H 2 O without the application of any external bias and consumption of any compounds, which is referred to as a Ag−MnO x /CTO photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Formation of CO and H₂O₂ from CO₂ and H₂O with a Ag–MnO_x/CaTiO₃ Photocatalyst

Soltani

Yamamoto

Singh

et al. 2021

ACS Appl. Energy Mater.

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Carbon monoxide (CO) is an important feedstock for the chemical industry, and hydrogen peroxide (H2O2) is also an important chemical with versatile applications. Here, a photocatalytic system was discovered for the simultaneous production of CO and H2O2 from CO2 and H2O with both high activity and selectivity without any externally applied voltage and any consumption of chemical compounds, which was promoted by using a calcium titanate (CaTiO3) photocatalyst modified with a silver–manganese oxide (Ag–MnO x ) dual cocatalyst. Although a Ag/CaTiO3(CTO) photocatalyst was reported to reduce CO2 with water to form CO and O2, the coexistence of MnO x species with silver nanoparticles (NPs) not only improved the CO formation rate more than 2 times with a selectivity of 76% but also changed the selectivity of the oxidative reaction and forms H2O2 instead of O2 with a high selectivity of 99%. The Ag NPs promoted the CO2 reduction to CO by the photoexcited electrons, and the Mn(III) oxide species deposited on the CaTiO3 surface contributed to the water oxidation to H2O2 by the positive holes in the aid of HCO3 – as a reaction mediator. The produced CO is easily separated from the aqueous solution to the gas phase, and the H2O2 is stably stored in the aqueous HCO3 – solution. This photocatalytic system can utilize the stable and ubiquitous molecules (CO2 and H2O) to produce reactive and useful molecules (CO and H2O2), concurrently, meaning that it can convert photoenergy to storable chemical energy to increase sustainability.

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“…Since then, the photocatalytic direction of research related to the decomposition of water (water splitting) into oxygen and hydrogen has developed intensively. Then, the decomposition of water was combined with the reduction of CO2 to obtain hydrogen, carbon monoxide, and useful hydrocarbons, as shown in the publication of T. Soltani et al [5], where selective photocatalysts for hydrogen production with reduction of CO2 were developed.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production From Water Under UV Radiation with Carbon Dioxide Mediation

Morawski

Kusiak-Nejman

Pełech

et al. 2021

Preprint

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A simple method of hydrogen production through the decomposition of water subjected to UV radiation is presented. Water contained dissolved sodium hydroxide and the solution was saturated with carbon dioxide gas. During saturation, the pH value dropped from about 11.5 to 7-8. The produced bicarbonate and carbonate ions acted as scavengers for hydroxyl radicals, preventing recombination of hydroxyl and hydrogen radicals, and giving priority to the formation of hydrogen gas.In the presented method, the production of hydrogen is combined with the utilization of carbon dioxide.

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Effect of transition metal oxide cocatalyst on the photocatalytic activity of Ag loaded CaTiO3 for CO2 reduction with water and water splitting

Cited by 97 publications

References 28 publications

New Insight on Carbon Dioxide‐Mediated Hydrogen Production**

New Insight on Carbon Dioxide‐Mediated Hydrogen Production**

Simultaneous Formation of CO and H₂O₂ from CO₂ and H₂O with a Ag–MnO_x/CaTiO₃ Photocatalyst

Hydrogen Production From Water Under UV Radiation with Carbon Dioxide Mediation

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Effect of transition metal oxide cocatalyst on the photocatalytic activity of Ag loaded CaTiO3 for CO2 reduction with water and water splitting

Cited by 97 publications

References 28 publications

New Insight on Carbon Dioxide‐Mediated Hydrogen Production**

New Insight on Carbon Dioxide‐Mediated Hydrogen Production**

Simultaneous Formation of CO and H2O2 from CO2 and H2O with a Ag–MnOx/CaTiO3 Photocatalyst

Hydrogen Production From Water Under UV Radiation with Carbon Dioxide Mediation

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Simultaneous Formation of CO and H₂O₂ from CO₂ and H₂O with a Ag–MnO_x/CaTiO₃ Photocatalyst