Photothermal Conversion of CO2 into CH4 with H2 over Group VIII Nanocatalysts: An Alternative Approach for Solar Fuel Production

Meng, Xianguang; Wang, Tao; Liu, Lequan; Ouyang, Shuxin; Li, Peng; Hu, Huilin; Kako, Tetsuya; Iwaï, Hideo; Tanaka, Akihiro; Ye, Jinhua

doi:10.1002/anie.201404953

Cited by 397 publications

(238 citation statements)

References 56 publications

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“…CO 2 reduction with H 2 via photothermal catalysis is one typical application, which will be discussed in detail. [26] …”

Section: Photothermal Catalysismentioning

confidence: 99%

“…Therefore, researchers have used the photothermal effect of catalysis based on the proper catalysts initiated by thermal energy. Ye et al [26] used group VIII nanocatalysts constructed with Al 2 O 3 to induce photothermal cataly sis for CO 2 reduction with H 2 . It was proposed that group VIII nanocatalysts possess highly efficient solar light absorption and photo thermal conversion abilities, as well as the unique catalytic ability for the hydrogenation of CO 2 .…”

Section: Photothermal Catalysismentioning

confidence: 99%

“…Moreover, because of improvements in nanoscale techniques, the thermal effect of solar light has been used in thermal-based catalysis. [25,26] This photothermally induced catalysis opens another door for solar light energy conversion. Although the photothermal effect is not the typical photocatalytic process based on photo-electric property of semiconductor, it is an assisted effect to activate the catalysts to proceed with the relative catalysis.…”

Section: Introductionmentioning

confidence: 99%

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Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

226

116

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photocatalysis based on semiconductors represents another route for light energy conversion. This route endows the direct conversion of light energy into oxidation and reduction energy via charge carriers (electrons and holes) generated in the semiconductors. For instance, the photocatalytic degradation of harmful and toxic organic substances, dyes, and chemicals has been considered to be a suitable candidate for removing organic pollution from water, [5][6][7][8] where photooxidation dominates the degradation of the organic molecules. The full process of photocatalytic water splitting into H 2 and O 2 is believed to be promising for generating renewable and green energy, [9,10] and the process includes the photoreduction and photooxidation of water, respectively. The photocatalytic reduction of CO 2 can convert solar energy into chemical energy, stored as CH 4 , CO, CH 3 OH, etc. [11][12][13] These processes can help reduce the pressure of the global warming crisis and supply usable renewable energy. Due to the precise control of photocatalytic reduction and oxidation, photocatalytic molecular synthesis has also attracted much interest, which provides a sustainable pathway for green synthesis. [14][15][16] For an efficient photocatalytic process, solar light harvesting and a redox process based on photogenerated charge carriers are essential steps. Solar light harvesting consists of light absorption and charge carrier excitation steps, which can be expressed as the light utilization efficiency. The efficiency determines the total energy converted from solar light and is mostly determined by the band structure of the semiconductor applied to the photocatalytic process.The photocatalytic process has been extensively studied by examining the response of photocatalysts to UV light, due to its relatively high photonic energy. As is well known, UV light energy amounts to no more than 5% of the solar light energy. Visible light and near-infrared (NIR) light contain approximately 90% of the solar light energy. To utilize solar light in order to solve the environmental and energy crisis, visible light and NIR-light-activated photocatalysts are essential. For decades, many studies have focused on expanding the range over which a photocatalyst can utilize the solar light spectrum. In addition, there are several good reviews summarizing recent progress on UV-vis-light-activated photocatalysts, as well as strategies to improve the photocatalytic efficiency. [17][18][19][20] As is well known, the photonic energy of visible light is low, and that of NIR light is even lower. Photoinduced redox requires an initial amount of energy to activate the process; however, NIR photonic energy may be too low to realize photoinduced The realization of light-chemical energy conversion using solar light is an ideal goal in renewable energy studies. Many reports are concerned with extracting energy from solar light and the use/storage of the converted energy. Due to the progress in solar light absorption with various photocatalysts, the vari...

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“…CO 2 reduction with H 2 via photothermal catalysis is one typical application, which will be discussed in detail. [26] …”

Section: Photothermal Catalysismentioning

confidence: 99%

Section: Photothermal Catalysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

226

116

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“…catalysts [11,12]. A further step in this sense would be the use of H 2 O instead of H 2 as the reducing agent, in essence mimicking the activation route of natural photosynthesis.…”

Section: Introductionmentioning

confidence: 99%

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Gonell

Puga

Julián‐López

et al. 2016

Applied Catalysis B: Environmental

105

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Copper-doped titanium dioxide materials with anatase phase (Cu-TiO 2 , atomic Cu contents ranging from 0 to 3% relative to the sum of Cu and Ti), and particle sizes of 12-15 nm, were synthesised by a solvo-thermal method using ethanol as the solvent and small amounts of water to promote the hydrolysis-condensation processes. Diffuse reflectance UV-vis spectroscopy show that the edges of absorption of the titania materials are somewhat shifted to higher wavelengths due to the presence of Cu. X-Ray Photoelectron Spectroscopy (XPS) indicate that Cu(II) is predominant. Photocatalytic CO 2 reduction experiments were performed in aqueous Cu-TiO 2 suspensions under UV-rich light and in the presence of different solutes. Sulfide was found to promote the efficient production of H 2 from water and formic acid from CO 2 . The effect of the Cu content on the photoactivity of Cu-TiO 2 was also studied, showing that copper plays a role on the photocatalytic reduction of CO 2 . IntroductionCarbon dioxide is an inexpensive and widely available feedstock. Its use for the production of chemicals is doubly beneficial, since in addition to its availability, it would represent a decrease in the carbon footprint for the manufacturing of the particular chemical. Other researchers have reported lower but noticeable methanol yields using similarly prepared photocatalysts and Hg lamp irradiation (10-23 µmol g cat −1 h −1 ) [19,20]. In gas-phase reactions, the formation of methanol was also reported, but in considerably lower yields (2 nmol g cat −1 h −1 ), being methane the major product formed by Cu/TiO 2 photocatalysis [21]. In contrast, similar materials were found to promote the formation of several hydrocarbons including methane, ethane and ethylene in conjunction with larger amounts of H 2 [22], whereas CO and methane were major products found in a more recent study [23]. A significant degree of discrepancy regarding the identity of the reaction products (in addition to their selectivities and yields) is apparent by considering the aforementioned literature data, although this could be in part due to the different synthetic procedures used for the preparation of the photocatalysts and to the varied irradiation conditions used.Despite the notable progress in this field of research, there is no clear trend which may allow to conclude on the actual mechanistic route and to gain knowledge on the role of copper on the reaction. Thorough kinetic and in situ spectroscopic studies would provide valuable information on the reaction at the surface of the photocatalyst and may guide future design of more active copper-titania materials. An important issue to focus on is the possible back-reactions of the reduction products on the photocatalyst. For example, it was observed that methanol and formaldehyde, initially formed by a photocatalytic process using Cu(0) powder and TiO 2 , were 3 rapidly consumed by in situ formed Cu/TiO 2 [24]. The simultaneous occurrence of CO 2 reduction and decomposition of the products should result in stat...

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“…Two of the most active and selective direct electrocatalysts for CO 2 to CH 4 conversion reported to date produce methane with 61% (43) and 76% (44) Faradaic efficiencies, but require overpotentials of η = 1.28 V and η = 1.52 V, respectively. Promising advances in photothermal reduction of CO 2 to CH 4 also have been recently reported (45). In comparison with fully inorganic catalysts, a distinct conceptual advantage of this hybrid materials biology approach, where the materials component performs water splitting to generate hydrogen and the biological component uses these reducing equivalents for CO 2 fixation, is that one can leverage the fact that biological catalysts operate at near thermodynamic potential (46).…”

mentioning

confidence: 99%

Hybrid bioinorganic approach to solar-to-chemical conversion

Nichols

Gallagher

Liu

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

245

187

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Natural photosynthesis harnesses solar energy to convert CO 2 and water to value-added chemical products for sustaining life. We present a hybrid bioinorganic approach to solar-to-chemical conversion in which sustainable electrical and/or solar input drives production of hydrogen from water splitting using biocompatible inorganic catalysts. The hydrogen is then used by living cells as a source of reducing equivalents for conversion of CO 2 to the value-added chemical product methane. Using platinum or an earth-abundant substitute, α-NiS, as biocompatible hydrogen evolution reaction (HER) electrocatalysts and Methanosarcina barkeri as a biocatalyst for CO 2 fixation, we demonstrate robust and efficient electrochemical CO 2 to CH 4 conversion at up to 86% overall Faradaic efficiency for ≥7 d. Introduction of indium phosphide photocathodes and titanium dioxide photoanodes affords a fully solar-driven system for methane generation from water and CO 2 , establishing that compatible inorganic and biological components can synergistically couple light-harvesting and catalytic functions for solar-to-chemical conversion.artificial photosynthesis | solar fuels | photocatalysis | carbon dioxide fixation | water splitting M ethods for the sustainable conversion of carbon dioxide to value-added chemical products are of technological and societal importance (1-3). Elegant advances in traditional approaches to CO 2 reduction driven by electrical and/or solar inputs using homogeneous (4-16), heterogeneous (17-26), and biological (7, 27-31) catalysts point out key challenges in this area, namely (i) the chemoselective conversion of CO 2 to a single product while minimizing the competitive reduction of protons to hydrogen, (ii) long-term stability under environmentally friendly aqueous conditions, and (iii) unassisted light-driven CO 2 reduction that does not require external electrical bias and/or sacrificial chemical quenchers. Indeed, synthetic homogeneous and heterogeneous CO 2 catalysts are often limited by product selectivity and/or aqueous compatibility, whereas enzymes show exquisite specificity but are generally less robust outside of their protective cellular environment. In addition, the conversion of electrosynthetic systems to photosynthetic ones is nontrivial owing to the complexities of effectively integrating components of light capture with bond-making and bond-breaking chemistry.Inspired by the process of natural photosynthesis in which lightharvesting, charge-transfer, and catalytic functions are integrated to achieve solar-driven CO 2 fixation (32-35), we have initiated a program in solar-to-chemical conversion to harness the strengths inherent to both inorganic materials chemistry and biology (36). As shown in Fig. 1, our strategy to drive synthesis with sustainable electrical and/or solar energy input (37) interfaces a biocompatible photo(electro)chemical hydrogen evolution reaction (HER) catalyst with a microorganism that uses this sustainably generated hydrogen as an electron donor for CO 2 reduction. Impo...

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Photothermal Conversion of CO₂ into CH₄ with H₂ over Group VIII Nanocatalysts: An Alternative Approach for Solar Fuel Production

Cited by 397 publications

References 56 publications

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Copper-doped titania photocatalysts for simultaneous reduction of CO2 and production of H2 from aqueous sulfide

Hybrid bioinorganic approach to solar-to-chemical conversion

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