Carbon quantum dots embedded with mesoporous hematite nanospheres as efficient visible light-active photocatalysts

Yu, Byong Yong; Kwak, Seung‐Yeop

doi:10.1039/c2jm16931b

Cited by 241 publications

(109 citation statements)

References 45 publications

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“…One located at 530.7 eV is identified with surface hydroxyls, which is likely the by-product from the synthesis process of CuO/TiO 2 . Additionally, the remaining two peaks observed at 531.5 eV and 532.8 eV are confirmed to C=O and C-O [44,45]. A slight peak of C 1 s was detected in Figure 2a, which is always observed in XPS spectra of real-world solids [46,47].…”

Section: Catalyst Characterizationsmentioning

confidence: 55%

CuO Nanoparticles Supported on TiO2 with High Efficiency for CO2 Electrochemical Reduction to Ethanol

et al. 2018

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Non-noble metal oxides consisting of CuO and TiO 2 (CuO/TiO 2 catalyst) for CO 2 reduction were fabricated using a simple hydrothermal method. The designed catalysts of CuO could be in situ reduced to a metallic Cu-forming Cu/TiO 2 catalyst, which could efficiently catalyze CO 2 reduction to multi-carbon oxygenates (ethanol, acetone, and n-propanol) with a maximum overall faradaic efficiency of 47.4% at a potential of −0.85 V vs. reversible hydrogen electrode (RHE) in 0.5 M KHCO 3 solution. The catalytic activity for CO 2 electroreduction strongly depends on the CuO contents of the catalysts as-prepared, resulting in different electrochemistry surface areas. The significantly improved CO 2 catalytic activity of CuO/TiO 2 might be due to the strong CO 2 adsorption ability.

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Section: Catalyst Characterizationsmentioning

confidence: 55%

CuO Nanoparticles Supported on TiO2 with High Efficiency for CO2 Electrochemical Reduction to Ethanol

et al. 2018

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“…The pair of mobile charges produced can reach the surface of the semiconductor particle and initiate the redox process. On the Fe 2 O 3 particle surface, the H 2 O molecule reacts with h + to produce a hydroxyl radical [62,63], Reaction (2). Subsequently, the hydroxyl radicals (OH • ) lead to the oxidation of NO to NO 2 , which, in turn, produces nitrite and nitrate ions, Reactions (3)- (5).…”

Section: No X Photocatalytic Oxidation Testmentioning

confidence: 98%

Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

Sugrañez

Balbuena

Cruz-Yusta

et al. 2015

Applied Catalysis B: Environmental

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“…The stability of the dye and the durability of the cell remain problems that need to be overcome for the development of these electrodes. Alternatively, quantum dots (including carbon dots) have been demonstrated as stable sensitizers for visible-light water splitting 97,98 . For example, by using a nanocomposite 99 comprising carbon dots and C 3 N 4 , a record STH efficiency of 2% was achieved with high stability, which is close to the 5% target for commercial viability set by the US Department of Energy.…”

Section: Solar Cellsmentioning

confidence: 99%

Mesoporous materials for energy conversion and storage devices

2016

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At present, more than 80% of the energy consumed globally is derived from non-renewable fossil fuels such as coal, oil and natural gas. The combustion of these fuels inevitably leads to the emission of CO 2 -a main driver of climate change and other serious environmental effects, including the emission of other dangerous gases. Although mitigating climate change is a multifaceted challenge, one of the pillars of any future low-carbon economy will be a substantially increased dependence on renewable and environmentally friendly energy sources and storage systems. Tremendous progress is being made in developing advanced technologies to meet these challenges. However, to enable the cost-effective, large-scale production of these technologies, further improvement of performance and efficiency is needed. Although unique challenges exist for each technology, the development of functional materials is crucial.Porous solids -in particular, mesoporous solids -are appealing materials in many energy applications owing to their ability to absorb and interact with guest species (including, but not limited to, lithium ions, hydrogen atoms and sulfur molecules) on their outer and inner surfaces, and in the pore spaces 1,2 . According to the International Union of Pure and Applied Chemistry (IUPAC) definition, porous materials are classified into three categories according to their pore sizes: micro porous (<2 nm), mesoporous (2-50 nm) or macro porous (>50 nm). Since the first report of mesoporous silica in the 1990s 3,4 , the variety of mesoporous materials available has rapidly expanded, encompassing a very broad range of compositions.Mesoporous materials have exceptional properties, including ultrahigh surface areas, large pore volumes, tunable pore sizes and shapes, and also exhibit nanoscale effects in their mesochannels and on their pore walls. These features are particularly advantageous for applications in energy conversion and storage [5][6][7][8][9][10] . In principle, high surface areas should provide a large number of reaction or interaction sites for surface or interface-related processes such as adsorption, separation, catalysis and energy storage; however, a high surface area does not necessarily translate to an improved performance in applications. Large pore volumes have shown promise in the loading of guest species and in the accommodation of the expansion and strain relaxation during repeated electrochemical energy storage processes. Uniform and tunable mesopore channels facilitate the transport of atoms, ions and large molecules through the bulk of the material, thereby increasing the number of active sites with high accessibility and overcoming the size restriction encountered with microporous materials. In addition, there are fascinating nanoconfinement effects in the voids of uniform mesochannels, which are advantageous in catalysis and energy storage. 3D nanometre-sized frameworks can produce extraordinary nanoscale effects (that is, surface and quantum effects) that result in mesoporous materials with u...

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Carbon quantum dots embedded with mesoporous hematite nanospheres as efficient visible light-active photocatalysts

Cited by 241 publications

References 45 publications

CuO Nanoparticles Supported on TiO2 with High Efficiency for CO2 Electrochemical Reduction to Ethanol

CuO Nanoparticles Supported on TiO2 with High Efficiency for CO2 Electrochemical Reduction to Ethanol

Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

Mesoporous materials for energy conversion and storage devices

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