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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Nanostructured N-doped orthorhombic Nb2O5 as an efficient stable photocatalyst for hydrogen generation under visible light
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Nanostructured N-doped orthorhombic Nb2O5 as an efficient stable photocatalyst for hydrogen generation under visible light

机译：纳米结构的N掺杂正交Nb2O5作为可见光下的氢气产生的有效稳定的光催化剂

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The synthesis of orthorhombic nitrogen-doped niobium oxide (Nb2O5-xNx) nanostructures was performed and a photocatalytic study carried out in their use in the conversion of toxic H2S and water into hydrogen under UV-Visible light. Nanostructured orthorhombic Nb2O5-xNx was synthesized by a simple solid-state combustion reaction (SSCR). The nanostructural features of Nb2O5-xNx were examined by FESEM and HRTEM, which showed they had a porous chain-like structure, with chains interlocked with each other and with nanoparticles sized less than 10 nm. Diffuse reflectance spectra depicted their extended absorbance in the visible region with a band gap of 2.4 eV. The substitution of nitrogen in place of oxygen atoms as well as Nb-N bond formation were confirmed by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. A computational study (DFT) of Nb2O5-xNx was also performed for investigation and conformation of the crystal and electronic structure. N-Substitution clearly showed a narrowing of the band gap due to N 2p bands cascading above the O 2p band. Considering the band gap in the visible region, Nb2O5-xNx exhibited enhanced photocatalytic activity toward hydrogen evolution (3010 mu mol h(-1) g(-1)) for water splitting and (9358 mu mol h(-1) g(-1)) for H2S splitting under visible light. The enhanced photocatalytic activity of Nb2O5-xNx was attributed to its extended absorbance in the visible region due to its electronic structure being modified upon doping, which in turn generates more electron-hole pairs, which are responsible for higher H-2 generation. More significantly, the mesoporous nanostructure accelerated the supression of electron and hole recombination, which also contributed to the enhancement of its activity.
机译：进行了正交氮掺杂的氧化铌（NB2O5-XNX）纳米结构的合成，并在紫外线可见光下将毒性H2S和水转化为氢气的光催化研究。通过简单的固态燃烧反应（SSCR）合成纳米结构正交NB2O5-XNX。通过FeSEM和HRTEM检查NB2O5-XNX的纳米结构特征，其显示它们具有多孔链状结构，其中链彼此互锁，纳米颗粒尺寸小于10nm。漫反射光谱描绘了它们在可见区域中的延伸吸光度，带有2.4eV的带隙。通过X射线光电子能谱（XPS）和拉曼光谱来确认氮气代替氧原子以及Nb-N键形成。还对晶体和电子结构的研究和构象进行了NB2O5-XNX的计算研究（DFT）。 N-替换清楚地表明由于在O 2P频带上方的N 2P条带级联而缩小带隙。考虑到可见区域中的带隙，Nb 2 O 5-XNX表现出氢化的增强的光催化活性（3010 mol H（-1）g（-1））用于水分裂和（9358μmolH（-1）g（ - 1））对于在可见光下分裂的H2S分裂。由于其电子结构在掺杂时被修改，因此Nb2O5-XNX的增强的光催化活性归因于其在可见区域中的延伸吸光度，这反过来产生更多的电子空穴对，这是负责更高的H-2代。更显着，中孔纳米结构加速了电子和空穴重组的凹陷，这也有助于增强其活性。

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    Kulkarni Aniruddha K.; Praveen C. S.; Sethi Yogesh A.; Panmand Rajendra P.; Arbuj Sudhir S.; Naik Sonali D.; Ghule Anil V.; Kale Bharat B.;

  • 作者单位

    Govt India Ctr Mat Elect Technol Nanocrystalline Lab Minist Elect &

    Informat Technol MeitY Off Pashan Rd Pune 411007 Maharashtra India;

    ETH Nanoscale Simulat Dept Mat HIT G33-2 Wolfgang Pauli Str CH-278093 Zurich Switzerland;

    Govt India Ctr Mat Elect Technol Nanocrystalline Lab Minist Elect &

    Informat Technol MeitY Off Pashan Rd Pune 411007 Maharashtra India;

    Govt India Ctr Mat Elect Technol Nanocrystalline Lab Minist Elect &

    Informat Technol MeitY Off Pashan Rd Pune 411007 Maharashtra India;

    Govt India Ctr Mat Elect Technol Nanocrystalline Lab Minist Elect &

    Informat Technol MeitY Off Pashan Rd Pune 411007 Maharashtra India;

    Govt India Ctr Mat Elect Technol Nanocrystalline Lab Minist Elect &

    Informat Technol MeitY Off Pashan Rd Pune 411007 Maharashtra India;

    Dr Babasaheb Ambedkar Marathwada Univ Dept Chem Aurangabad 431004 Maharashtra India;

    Govt India Ctr Mat Elect Technol Nanocrystalline Lab Minist Elect &

    Informat Technol MeitY Off Pashan Rd Pune 411007 Maharashtra India;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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