CdS Quantum Dots Sensitized 2D La2Ti2O7 Nanosheets as Support for Visible Light‐Assisted Electrocatalytic Methanol Oxidation in Alkaline Medium

Wang, Yuan; Hu, Jiayue; Zhai, Chunyang; Gao, Haifeng; Liu, Zhao‐Qing; Du, Yukou; Zhu, Mingshan

doi:10.1002/ente.201800539

Cited by 17 publications

(7 citation statements)

References 41 publications

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“…As shown in Figure B, the degree of fluorescent quenching of TCPP–CoS is greater than that of CoS. The efficient PL quenching means that TCPP–CoS can effectively inhibit the electron–hole recombination, indicating that the photogenerated electrons generated by excited porphyrins are efficiently trapped by CoS …”

Section: Resultsmentioning

confidence: 96%

“…As shown in Figure 6B, the degree of fluorescent quenching of TCPP−CoS is greater than that of CoS. The efficient PL quenching means that TCPP− CoS can effectively inhibit the electron−hole recombination, indicating that the photogenerated electrons generated by excited porphyrins are efficiently trapped by CoS. 46 Figure 6C displays the UV−vis diffuse reflectance spectra (DRS) of CoS and TCPP−CoS, respectively. The same amounts of both catalysts were used in the UV/Vis diffuse reflection experiments.…”

Section: Resultsmentioning

confidence: 97%

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Porphyrin-Modified Cobalt Sulfide as a Developed Noble Metal-free Photoelectrocatalyst toward Methanol Oxidation under Visible Light

et al. 2020

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Designing noble metal-free electrocatalysts with highly efficient performance toward methanol oxidation reaction (MOR) still remains a significant challenge. Herein, 5,10,15,20-tetrakis(4-carboxylphenyl) porphyrin (TCPP) was used as a photosensitive organic molecule to modify cobalt sulfide (CoS) nanosheets, which exhibit a higher catalytic activity toward MOR than pure CoS under visible irradiation. Photoluminescence emission spectra and UV–vis diffuse reflectance spectra (DRS) reveal the catalytic mechanism from the synergetic effect from porphyrin molecules and CoS nanosheets because the recombination of photoelectrons and holes of the nanocomposites is remarkably inhibited and then electron transfer is accelerated. Notably, TCPP–CoS exhibits the high mass activity of 1240 mA mg–1 for MOR irradiated by visible light, which is 1.43 times that of pure CoS. This work opens up a feasible and practical pathway for designing highly efficient noble metal-free MOR photoelectrocatalysts.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 97%

Porphyrin-Modified Cobalt Sulfide as a Developed Noble Metal-free Photoelectrocatalyst toward Methanol Oxidation under Visible Light

et al. 2020

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“…The high dispersion of CdS has been confirmed that can boost the photo/electrocatalytic activity. [ 17 ]…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Oxidative Coupling of Benzylamine to Schiff Base over 0D/2D CdS/CdIn₂S₄ Heterojunction

Huang

et al. 2022

Energy Tech

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Photocatalytic organic synthesis as a green pathway has become a promising extended branch of organic chemistry and received significant attention owing to its mild operational conditions and eco-friendly features. [1] Imine and its derivatives are vital intermediates to construct N-containing heterocyclic compounds for the fine chemical industry and pharmaceutical industry. Currently, it is an energy-consuming and environmentally harmful process in the industrial production of imines, where the condensation of amines with aldehydes to form imines are usually required organic solvents and elevated temperatures, which greatly limits their large-scale applications. [2] Alternatively, the efficient photocatalysis oxidation of amine to imine is a sustainable approach. However, the photocatalytic efficiency and synthesis yield related to the band structures of semiconductor materials are not satisfied the high requirements of potential industrialization. Thence, it is urgent to develop a more suitable semiconductor structure to enhance the utilization efficiency of photoinduced charge carriers and thus the photocatalytic oxidation performance of amine to imine.Recently, substantial efforts have been devoted to improving photocatalytic oxidation efficiency. A series of semiconductor materials have been widely developed in the photoinduced organic transformation of amine to imine, including bismuth oxyhalides, [3] bismuth molybdate, [4] tungsten sulfide, [5] graphitic carbon nitride, [6] TiO 2 , [7] metal-organic frameworks [8] and ZnIn 2 S 4 . [9] However, one of the challenges faced by photocatalytic imine synthesis is how to improve the imine yield and transformation rate. Constructing heterojunction semiconductor structure are deemed as one of the most effective strategies to boost the visible light absorption ability, photogenerated electron-hole pairs separation rate, and redox ability. For instance, Zhang and colleagues demonstrated that the photocatalytic coupling of amines and alcohols under visible light conditions was improved by employing the CdS quantum dots (QDs) decorated MIL-101 photocatalyst. The optimized CdS@MIL-101 exhibited 57% conversion of benzylamine with more than 99% selectivity of imine within 1 h. As proposed by Li et al., an all-solid-state Z-scheme photocatalyst of WO 3 •H 2 O/Pd/CdS ternary heterostructures was designed to extend light harvesting region, faster spatial separation of electron and holes, and elevate redox power. [10] As results, the WO 3 •H 2 O/Pd/CdS ternary heterostructures showed 7.3-fold and 1.7-fold increase in the percent conversion of the oxidative coupling of benzylamines to imines as compared to pristine WO 3 •H 2 O nanosheets and bare CdS nanoparticles, respectively. However, we notice that these two heterogeneous semiconductors face a strong coulomb electrostatic repulsive force at their interface. The photogenerated electrons and holes pass the interface between these heteroid semiconductor would suffer a high carrier transport activation energy and prevent the...

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“…When reacts with the OH À /H 2 O on the catalyst, h þ potential is just able to form a hydroxyl radical (•OH) with the OH À . [42,43] Subsequently, the e À is transferred to RGO and then to the electrode. The •OH has highly oxidizing property and can oxidize substances (e.g., methanol molecules) adsorbed on the electrode surface.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrocatalytic Oxidation of Methanol on Pt‐Decorated Bi₂WO₆/Graphene Nanosheets with Visible Light Assistance

Gao

Chen

et al. 2020

Energy Tech

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Noble metal/semiconductor–based electrocatalysts have been proverbially used as the anode material in direct methanol fuel cells (DMFCs) recently. Combined with the advantage of the properties of noble metals and semiconductors, photo‐assisted electrocatalytic methanol oxidation is a valid route to increase the catalytic activity of catalysts in DMFCs. Herein, a 2D composite of bismuth tungstate/reduced graphene oxide (Bi2WO6/RGO) with excellent optical, electrical, and thermal stability is used as the support for the decoration of platinum nanoparticles (Pt NPs) to synthesize a new electrocatalyst of Pt‐Bi2WO6/RGO. Under ambient conditions, the methanol oxidation reaction (MOR) activity of the Pt‐Bi2WO6/RGO electrocatalyst increases relative to the Pt/Bi2WO6 electrode. Note that, under visible light irradiation, it deals with big enhancement of methanol oxidation activity on Pt‐Bi2WO6/RGO electrode, highlighting the effect of RGO used as Bi2WO6 cocatalysis for the MOR activity under illumination. Meanwhile, the corresponding reaction mechanisms with/without visible light are presented, and the roles of Pt‐Bi2WO6/RGO for photo‐assisted electrochemical reactions are proposed.

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CdS Quantum Dots Sensitized 2D La₂Ti₂O₇ Nanosheets as Support for Visible Light‐Assisted Electrocatalytic Methanol Oxidation in Alkaline Medium

Cited by 17 publications

References 41 publications

Porphyrin-Modified Cobalt Sulfide as a Developed Noble Metal-free Photoelectrocatalyst toward Methanol Oxidation under Visible Light

Porphyrin-Modified Cobalt Sulfide as a Developed Noble Metal-free Photoelectrocatalyst toward Methanol Oxidation under Visible Light

Photocatalytic Oxidative Coupling of Benzylamine to Schiff Base over 0D/2D CdS/CdIn₂S₄ Heterojunction

Enhanced Electrocatalytic Oxidation of Methanol on Pt‐Decorated Bi₂WO₆/Graphene Nanosheets with Visible Light Assistance

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CdS Quantum Dots Sensitized 2D La2Ti2O7 Nanosheets as Support for Visible Light‐Assisted Electrocatalytic Methanol Oxidation in Alkaline Medium

Cited by 17 publications

References 41 publications

Porphyrin-Modified Cobalt Sulfide as a Developed Noble Metal-free Photoelectrocatalyst toward Methanol Oxidation under Visible Light

Porphyrin-Modified Cobalt Sulfide as a Developed Noble Metal-free Photoelectrocatalyst toward Methanol Oxidation under Visible Light

Photocatalytic Oxidative Coupling of Benzylamine to Schiff Base over 0D/2D CdS/CdIn2S4 Heterojunction

Enhanced Electrocatalytic Oxidation of Methanol on Pt‐Decorated Bi2WO6/Graphene Nanosheets with Visible Light Assistance

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Product

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CdS Quantum Dots Sensitized 2D La₂Ti₂O₇ Nanosheets as Support for Visible Light‐Assisted Electrocatalytic Methanol Oxidation in Alkaline Medium

Photocatalytic Oxidative Coupling of Benzylamine to Schiff Base over 0D/2D CdS/CdIn₂S₄ Heterojunction

Enhanced Electrocatalytic Oxidation of Methanol on Pt‐Decorated Bi₂WO₆/Graphene Nanosheets with Visible Light Assistance