Ag-loading on brookite TiO2 quasi nanocubes with exposed {2 1 0} and {0 0 1} facets: Activity and selectivity of CO2 photoreduction to CO/CH4

Li, Kan; Peng, Tianyou; Ying, Zihao; Song, Shuaishuai; Zhang, Jing

doi:10.1016/j.apcatb.2015.06.022

Cited by 135 publications

(79 citation statements)

References 48 publications

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“…For instance, a non-trivial influence of co-catalyst loading on CO 2 photoreduction activity and selectivity was recently reported for brookite nanocubes loaded with Ag nanoparticles [94]. A maximum yield of CO was observed for 0.5 wt.…”

Section: Discussionmentioning

confidence: 93%

“…Nonetheless, nanostructured brookite (e.g., nanorods [28], nanosheets [64], and nanocubes [94]) has been successfully synthesized, and alternative strategies are being proposed to produce highly-oriented brookite and TiO 2 nanoparticles with the desirable specific external crystal facet (e.g., templating with graphene [95] or 2D oxides [96]). The playground is now open to new areas of investigation, such as the development of scalable and sustainable brookite synthesis, modification by doping [10,[50][51][52][53], controlled introduction of defects, and synthesis of brookite nanocomposites [94,97] and hybrid organic-inorganic systems [98]. In particular, the effect of TiO 2 phase composition in nanocomposites with metal organic frameworks (MOFs), quantum dots and nanocarbons is still to be assessed.…”

Section: Discussionmentioning

confidence: 99%

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Brookite: Nothing New under the Sun?

2017

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Advances in the synthesis of pure brookite and brookite-based TiO 2 materials have opened the way to fundamental and applicative studies of the once least known TiO 2 polymorph. Brookite is now recognized as an active phase, in some cases showing enhanced performance with respect to anatase, rutile or their mixture. The peculiar structure of brookite determines its distinct electronic properties, such as band gap, charge-carrier lifetime and mobility, trapping sites, surface energetics, surface atom arrangements and adsorption sites. Understanding the relationship between these properties and the photocatalytic performances of brookite compared to other TiO 2 polymorphs is still a formidable challenge, because of the interplay of many factors contributing to the observed efficiency of a given photocatalyst. Here, the most recent advances in brookite TiO 2 material synthesis and applications are summarized, focusing on structure/activity relation studies of phase and morphology-controlled materials. Many questions remain unanswered regarding brookite, but one answer is clear: Is it still worth studying such a hard-to-synthesize, elusive TiO 2 polymorph? Yes.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Brookite: Nothing New under the Sun?

2017

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“…[3][4][5] Since Inoue and co-workers first achieved the pioneering proof-of-concept study of photocatalytic CO 2 reduction in aqueous solution containing semiconductor powders such as TiO 2 , ZnO and CdS in 1979, 6 the photocatalytic activity of various metal oxides [7][8][9][10][11][12] , metal sulfides 13,14 and metal-free photocatalysts [15][16][17] for CO 2 reduction to hydrocarbon solar fuels are extensively investigated. [19][20][21][22][23] A large intrinsic band gap (3.2 eV) of TiO 2 only allows the absorption of ultraviolet light that accounts for only 4% of solar spectrum and thus strongly impairs its photocatalytic performances and practical applications. 18 Although several groups attempted to probe the mechanism of photocatalytic CO 2 reduction, the underlying details of this process still remain ambiguous.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of g-C₃N₄ for selective CO₂ reduction to CH₃OH via facile coupling of ZnO: a direct Z-scheme mechanism

2015

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Photocatalytic CO 2 reduction into renewable hydrocarbon solar fuels is considered as a promising strategy to simultaneously address the global energy and environmental issues. In this study, a binary g-C 3 N 4 /ZnO photocatalytic system was constructed via a one-step facile calcination method and further used as photocatalysts for CO 2 reduction. It was shown that the as-prepared g-C 3 N 4 /ZnO photocatalytic system exhibited enhanced photocatalytic activity for CO 2 reduction by a factor of 2.3 compared with the pure g-C 3 N 4 , while maintaining the original selectivity of pure g-C 3 N 4 to convert CO 2 directly into CH 3 OH. For the first time, the coupling effect of ZnO responsible for the improved photoactivity of g-C 3 N 4 was fully illustrated and a direct Z-scheme mechanism rather than the conventional heterojunction-type mechanism was proposed to explain the better performances of g-C 3 N 4 /ZnO binary composite photocatalytic system. The enhancement of photocatalytic CO 2 reduction activity is attributed to the highly efficient ZnO-to-g-C 3 N 4 electron transfer occurring at the intimate contact interface between g-C 3 N 4 phase and ZnO phase. This work will provide new deep insights into the rational construction of g-C 3 N 4 -based photocatalytic system and the design of direct Z-scheme system without an electron mediator for photocatalytic CO 2 reduction reactions.Please do not adjust margins confirming the existence of the interfacial contact proposed above. The denoted lattice fringes with d spacing of 0.26 nm can be assigned to the (002) crystal plane of hexagonal wurtzite ZnO. 46 TOC Direct Z-scheme g-C 3 N 4 /ZnO binary composite photocatalytic system was constructed and exhibited enhanced photocatalytic CO 2 reduction activity than g-C 3 N 4 or ZnO.

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“…[18,19] The above investigations imply that brookite TiO 2 would have betterp hotocatalytic and photoelectrical conversion properties than anatase and rutile. [13][14][15][16][17][18][19][20][21] Although TiO 2 -based materials are widely applied in the field of photocatalysis, [22][23][24][25][26] the photoactivities are still quite low due to its wide band gap, fast charger ecombination, and the possible reverse reactiono ft he reduction products. [3][4][5][27][28][29][30] To overcome these problems,s everals trategiess uch as metal/ metal oxide loading, cation/anion doping, surface treatment and modification have been developed to modify TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…[4,31] Recently,i tw as found that Ag loading on the brookite TiO 2 quasi-nanocubes (BTN) leads to higher photoactivity as compared to the pristine one, Ag nanoparticle size and its distribution on the exposed facets of the BTN significantly influence the activity and selectivity of CO 2 photoreduction to CO/CH 4 generation. [20] Compared to noble metals (such as Pt, Ag, Rh), transition metal/metal oxides are more attractive co-catalysts for lowcost photocatalytic applications. [32][33][34][35][36][37][38][39][40][41][42][43] In particular,v arious Cu speciess uch as Cu [32,38] and CuO x [39,40] have been used to promote the photoactivity of anatase TiO 2 due to its advantages such as abundance,n on-toxicity,a nd large work function (4.65 eV).…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of Cu‐Nanocluster‐Decorated Brookite TiO₂Quasi‐Nanocubes for Enhanced Activity and Selectivity of CO₂ Photoreduction to CH₄

et al. 2017

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A new kind of metallic Cu‐loaded brookite TiO2 composite, in which Cu nanoclusters with a small size of 1–3 nm are decorated on brookite TiO2 quasi nanocube (BTN) surfaces (hereafter referred to as Cu‐BTN), is synthesized via a one‐pot hydrothermal process and then used as photocatalyst for CO2 reduction. It was found that the decoration of Cu nanoclusters on BTN surfaces can improve the activity and selectivity of CO2 photoreduction to CH4, and 1.5 % Cu‐BTN gives a maximum overall photocatalytic activity (150.9 μmol g−1 h−1) for CO/CH4 production, which is ≈11.4 and ≈3.3 times higher than those of pristine BTN (13.2 μmol g−1 h−1) and Ag‐BTN (45.2 μmol g−1 h−1). Moreover, the resultant Cu‐BTN products can promote the selective generation of CH4 as compared to CO due to the number of surface oxygen vacancies and the CO2/H2O adsorption behavior, which differs from that of the pristine BTN. The present results demonstrate that brookite TiO2 would be a potential effective photocatalyst for CO2 photoreduction, and that Cu nanoclusters can act as an inexpensive and efficient co‐catalyst alternative to the commonly used noble metals to improve the photoactivity and selectivity for CO2 reduction to CH4.

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Ag-loading on brookite TiO2 quasi nanocubes with exposed {2 1 0} and {0 0 1} facets: Activity and selectivity of CO2 photoreduction to CO/CH4

Cited by 135 publications

References 48 publications

Brookite: Nothing New under the Sun?

Brookite: Nothing New under the Sun?

Enhanced photocatalytic activity of g-C₃N₄ for selective CO₂ reduction to CH₃OH via facile coupling of ZnO: a direct Z-scheme mechanism

One‐Pot Synthesis of Cu‐Nanocluster‐Decorated Brookite TiO₂Quasi‐Nanocubes for Enhanced Activity and Selectivity of CO₂ Photoreduction to CH₄

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Ag-loading on brookite TiO2 quasi nanocubes with exposed {2 1 0} and {0 0 1} facets: Activity and selectivity of CO2 photoreduction to CO/CH4

Cited by 135 publications

References 48 publications

Brookite: Nothing New under the Sun?

Brookite: Nothing New under the Sun?

Enhanced photocatalytic activity of g-C3N4 for selective CO2 reduction to CH3OH via facile coupling of ZnO: a direct Z-scheme mechanism

One‐Pot Synthesis of Cu‐Nanocluster‐Decorated Brookite TiO2Quasi‐Nanocubes for Enhanced Activity and Selectivity of CO2 Photoreduction to CH4

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Product

Resources

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Enhanced photocatalytic activity of g-C₃N₄ for selective CO₂ reduction to CH₃OH via facile coupling of ZnO: a direct Z-scheme mechanism

One‐Pot Synthesis of Cu‐Nanocluster‐Decorated Brookite TiO₂Quasi‐Nanocubes for Enhanced Activity and Selectivity of CO₂ Photoreduction to CH₄