Abstract Inspired by nature, it has been considered an effective approach to design artificial photosynthetic system by fabricating Z‐scheme photocatalysts to eliminate environmental issues and alleviate the global energy crisis. However, the development of low cost, environment‐friendly, and high‐efficient photocatalysts by utilizing solar energy still confronts huge challenge. Herein, we constructed a Bi 2 O 3 /(BiO) 2 CO 3 /Bi 2 MoO 6 ternary heterojunction via a facile solvothermal method and calcination approach and used it as a photocatalyst for the degradation of phenol. The optimized Bi 2 O 3 /(BiO) 2 CO 3 /Bi 2 MoO 6 heterojunction delivers a considerable activity for phenol photodegradation with an impressive removal efficiency of 98.8 % and about total organic carbon (TOC) of 68 % within 180 min under visible‐light irradiation. The excellent photocatalytic activity was ascribed to the formation of a Z‐scheme heterojunction, more importantly, the presence of (BiO) 2 CO 3 as an electron bridge greatly shortens the migration distance of photogenerated electron from E CB of Bi 2 O 3 to E VB of Bi 2 MoO 6 , thus prolonging the lifetime of photogenerated electrons, which is verified by trapping experiments, electron spin‐resonance spectroscopy (ESR) results, and density functional theory (DFT) calculations. This work provides a potential strategy to fabricate highly efficient Bi‐based Z‐scheme photocatalysts with wide application prospects in solar‐to‐fuel conversion and environmental protection.
A 无 机 材 料 学 报 第 30 卷 cation (surface sensitization, semiconductor combinations and noble metal deposition) to increase life-time of carrier.Suitable band structure is responsible for the visible-light harvesting and effective separation of carrier of semiconductor photocatalyst.
Electrochemical N₂ reduction (ENR) offers a promising route for NH₃ production. To promote this kinetically sluggish process, the design and development of electrocatalysts with high performance, good durability, low cost, and earth abundance are highly demanded. Here, we report a facile approach for the synthesis of metal-doped ultrafine W₁₈O₄₉ nanowires with significantly enhanced capability for electrocatalytic N₂ reduction to produce NH₃ within a wide pH range. In particular, the Mo-doped W₁₈O₄₉ catalyst can reduce N₂ to NH₃ with a faradaic efficiency approaching 12.1% at −0.2 V (versus the reversible hydrogen electrode, vs. RHE) and an NH₃ yield rate of 5.3 μgNH₃ h–¹ mgcₐₜ.–¹ at −0.5 V (vs. RHE) in 0.1 M Na₂SO₄, which is about two times higher than that of pristine W₁₈O₄₉. We find occurrence of strong electron transfer from Mo to W, which facilitates N₂ adsorption and activation, thus accelerating the ENR to generate NH₃. This work provides a simple and effective method to modify metal oxides for efficient electrochemical N₂ fixation.
In this work, the surface plasmon resonance effect of metallic Ag, surface oxygen vacancies (SOVs), and Bi2 MoO6 (BMO) material were rationally combined to construct new oxygen-vacancy-rich Ag/Bi2 MoO6 (A/BMO-SOVs) photocatalysts. Their synergistic effect on the photocatalytic degradation of phenol and 4-nitrophenol under visible-light irradiation (λ≥420 nm) was also investigated. TEM, EPR, and Raman spectra demonstrate the co-existence of metallic Ag nanoparticles, surface oxygen vacancies, and Bi2 MoO6 due to a controlled calcination process. The experimental results disclose that the 2 %A/BMO-SOVs-375 sample exhibited the highest photocatalytic activity for the degradation of both phenol and 4-nitrophenol under visible-light irradiation, achieving nearly 100 and 80 % removal efficiency, respectively, and demonstrated the apparent reaction rate constants (kapp ) 183 and 26.5 times, respectively, higher than that of pure Bi2 MoO6 . The remarkable photodegradation performance of A/BMO-SOVs for organic substances is attributed to the synergistic effect between the surface oxygen vacancies, metallic Ag nanoparticles, and Bi2 MoO6 , which not only improves the visible-light response ability, but also facilitates charge separation. Thus, this work provides an effective strategy for the design and fabrication of highly efficient photocatalysts through integrating surface oxygen vacancies and the surface plasmon resonance effect of nanoparticles, which has the potential for both water treatment and air purification.
Using a reliable solvothermal process combined with an impregnation–calcination approach, an oxygen-vacancy-rich Ag/Bi2MoO6 photocatalyst was fabricated that was active for both phenol and 4-nitrophenol degradation. This work provides an effective strategy for the design and fabrication of highly efficient photocatalysts through integrating surface oxygen vacancies and surface plasmon resonance effect of nanoparticles and the potential to water treatment and air purification. For more information, see the Full Paper by F. Fu, D. J. Wang, B. Shao, J. W. Tang et al. on page 18463 ff.
We report single yttrium sites anchored on carbon-coated TiO2 for efficient and stable electrocatalytic N2 fixation, delivering an NH3 faradaic efficiency exceeding 11.0% and an NH3 yield rate as high as 6.3 μgNH3 h-1 mgcat.-1 at low overpotentials, thus surpassing many reported metal electrocatalysts.
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