Ultrathin bismuth oxyiodide nanosheets for photocatalytic ammonia generation from nitrogen and water under visible to near-infrared light

Mohebinia, Mohammadjavad; Wu, Chunzheng; Yang, Guang; Dai, Shenyu; Hakimian, Alireza; Tong, Tian; Ghasemi, Hadi; Wang, Z.; Wang, D.; Ren, Zhifeng; Bao, Jiming

doi:10.1016/j.mtphys.2020.100293

Cited by 19 publications

(7 citation statements)

References 52 publications

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“…The 14 NH 4 + -related triple peaks and 15 NH 4 + -related double peaks appeared in the 1 H-NMR spectrum under 14 N 2 and 15 N 2 atmosphere, respectively. The corresponding coupling constants are J N–H = 52 Hz and J N–H = 72 Hz, confirming that the ammonia is derived from N 2 , not carbon nitride (Figure d) . To further prove the contribution of long-wavelength light to the reaction, we evaluated the light utilization efficiency of HV-C 3 N 4 /r-PW 12 by calculating the apparent quantum yield (AQY) under various monochromatic light irradiations (Figure e).…”

Section: Resultsmentioning

confidence: 62%

“…The HV-C 3 N 4 still maintains a two-dimensional sheet morphology after loading the r-POMs (Figure S3). As shown in Figure 1f 52 Notably, the N−(C) 3 groups in HV-C 3 N 4 decreased more than that in g-C 3 N 4 , 63 and the peak area ratio of N−(C) 3 to C−NH x also decreased from 3.6 to 1.5, further confirming the existence of N vacancies in HV-C 3 N 4 materials. 27 The shifts of the C 1s and N 1s peaks in the composite nanocatalysts could be caused by the charge transfer at their interfaces (Figure 2e,f).…”

Section: Methodsmentioning

confidence: 60%

“…Meanwhile, the N 1s spectrum can be divided into four peaks: the side N–H moieties (404.2 eV), C–NH x (401.2 eV), N–(C) 3 (399.7 eV), and C–NC (398.5 eV) of g -C 3 N 4 . Notably, the N–(C) 3 groups in HV-C 3 N 4 decreased more than that in g -C 3 N 4 , and the peak area ratio of N–(C) 3 to C–NH x also decreased from 3.6 to 1.5, further confirming the existence of N vacancies in HV-C 3 N 4 materials . The shifts of the C 1s and N 1s peaks in the composite nanocatalysts could be caused by the charge transfer at their interfaces (Figure e,f) .…”

Section: Resultsmentioning

confidence: 98%

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Heteropoly Blue/Protonation-Defective Graphitic Carbon Nitride Heterojunction for the Photo-Driven Nitrogen Reduction Reaction

Wang

Xue

et al. 2021

Inorg. Chem.

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The establishment of a heterojunction is a crucial strategy to design highly effective nonnoble metal nanocatalysts for the photocatalytic nitrogen reduction reaction (PNRR). Heteropoly blues (r-POMs) can act as electron-transfer mediators in PNRR, but its agglomeration limits the further promotion of PNRR productivity. In this work, we construct a protonation-modified surface of N-vacancy g-C 3 N 4 (HV-C 3 N 4 ), achieving the high dispersion of r-POMs via the surface modification strategy. Enlightened by the synergy effect of the nitrogenase, r-POMs were anchored onto HV-C 3 N 4 nanosheets through an electrostatic self-assembly method for preparing r-POMs-based protonation-defective graphitic carbonitride (HV-C 3 N 4 /r-POMs). As an electron donor, r-PW 12 can match with the energy level of HV-C 3 N 4 to build a heterojunction. The electron redistribution of the heterojunction facilitates the optimization of the electronic structure for enhancing the performance of PNRR. HV-C 3 N 4 /r-PW 12 exhibits the best PNRR efficiency of 171.4 μmol L −1 h −1 , which is boosted by 94.39% (HV-C 3 N 4 ) and 86.98% (r-PW 12 ). The isotope 15 NH 4 + experiment proves that ammonia is derived from N 2 , not carbon nitride. This study opens up a crucial view to achieve the high dispersion of r-POMs nanoparticles and develop high-efficiency nonnoble metal photocatalysts for the PNRR.

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Section: Resultsmentioning

confidence: 62%

Section: Methodsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 98%

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Heteropoly Blue/Protonation-Defective Graphitic Carbon Nitride Heterojunction for the Photo-Driven Nitrogen Reduction Reaction

Wang

Xue

et al. 2021

Inorg. Chem.

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“…Appropriate engineering of defects enables one to modulate the band gap structure of a semiconductor [238,239]. Generation of defects is inferred to introduce electronic states within the bandgap, which helps to narrow the bandgap and serve as mid-gap states for the photoexcited electron, thereby expanding the light response range [240]. The position of mid-gap states can be tuned by tailoring the types and concentrations of defects.…”

Section: Extending Light Response Rangementioning

confidence: 99%

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

et al. 2021

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Engineering of defects in semiconductors provides an effective protocol for improving photocatalytic N2 conversion efficiency. This review focuses on the state-of-the-art progress in defect engineering of photocatalysts for the N2 reduction toward ammonia. The basic principles and mechanisms of thermal catalyzed and photon-induced N2 reduction are first concisely recapped, including relevant properties of the N2 molecule, reaction pathways, and NH3 quantification methods. Subsequently, defect classification, synthesis strategies, and identification techniques are compendiously summarized. Advances of in situ characterization techniques for monitoring defect state during the N2 reduction process are also described. Especially, various surface defect strategies and their critical roles in improving the N2 photoreduction performance are highlighted, including surface vacancies (i.e., anionic vacancies and cationic vacancies), heteroatom doping (i.e., metal element doping and nonmetal element doping), and atomically defined surface sites. Finally, future opportunities and challenges as well as perspectives on further development of defect-engineered photocatalysts for the nitrogen reduction to ammonia are presented. It is expected that this review can provide a profound guidance for more specialized design of defect-engineered catalysts with high activity and stability for nitrogen photochemical fixation.

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“…They can also have a huge active surface area to support electroactive species, resulting in high electrochemical efficiency, − which makes porous materials an active participant in industrial application. , However, Sivakumar et al reported the NiCo 2 O 4 (NCO) nanosheets for electrochemical sensing, and their work necessitates a two-step template synthetic procedure. When the template was removed as a control, the dodecahedron structure was obtained instead of nanosheets …”

Section: Introductionmentioning

confidence: 99%

Hydrothermal-Dependent Synthesis of Exfoliated Nickel Cobaltite Layers for Simultaneous Determination of IARC Group 2B, 3B Carcinogens

Joseph

Kogularasu

Wang

et al. 2021

ACS Appl. Nano Mater.

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This article describes a more accurate, reliable, and responsive electrochemical sensor for the specific analysis of major isomers of dihydroxybenzene at binary metal oxide, nickel cobaltite (NiCo 2 O 4 ) nanosheets. In this sustainable synthesis, we report the obtention of NiCo 2 O 4 (NCO) sheets prepared through the temperature-controlled hydrothermal route which yields NCO I (stacked sheets), NCO II (multilayered sheets), and NCO III (thin sheets). Then, the structural, morphological, and chemical properties were analyzed via, microscopic, diffractive, spectral studies, while the electrocatalytic activity was examined through voltammetric analysis. The electronic structure gained via hydrothermal treatment and analytical findings reveals the appropriate band position of the produced NCO sheets to be used in electrocatalytical methods. Hence, the designed sensor was evaluated to sense the major isomers of dihydroxybenzene, which pollutes the aquatic ecosystems. Therefore, for results the hydrothermally prepared NCO sheets through the temperature-controlled hydrothermal route were employed to sense the isomers of dihydroxybenzene specifically in real-time.

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Ultrathin bismuth oxyiodide nanosheets for photocatalytic ammonia generation from nitrogen and water under visible to near-infrared light

Cited by 19 publications

References 52 publications

Heteropoly Blue/Protonation-Defective Graphitic Carbon Nitride Heterojunction for the Photo-Driven Nitrogen Reduction Reaction

Heteropoly Blue/Protonation-Defective Graphitic Carbon Nitride Heterojunction for the Photo-Driven Nitrogen Reduction Reaction

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

Hydrothermal-Dependent Synthesis of Exfoliated Nickel Cobaltite Layers for Simultaneous Determination of IARC Group 2B, 3B Carcinogens

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