High-performance nitrogen photofixation by Bi2Sn2O7 nanoparticles enriched with oxygen vacancies
High-performance nitrogen photofixation by Bi2Sn2O7 nanoparticles enriched with oxygen vacancies
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DOI：
10.1016/j.apcatb.2022.122260
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
Shuai Gao;Runjie Wu;M. Sun;M. Guo;D. DuBois;Shaowei Chen;Haodong Ji;Changzheng Wang;
中科院分区：
文献类型：
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作者：
Shuai Gao;Runjie Wu;M. Sun;M. Guo;D. DuBois;Shaowei Chen;Haodong Ji;Changzheng Wang;
传统的Haber-Bosch工艺生产NH3能耗高、碳排放量大，开发温和条件下有效的人工固氮技术具有重要的基础和技术意义。在这项研究中，Bi 2Sn 2 O 7超小纳米焦绿石相的水热合成，并对固氮光催化活性被发现调制通过添加油酸钠。其中，最优样品的光催化性能最好，NH3生成速率为231 μmol g−1h−1，这是由于其具有高的比表面积、大量的N2吸附活性位和大量的晶格氧空位。结合第一性原理计算的结果，Bi物种周围的O2位氧空位被发现在吸附和活化的N2中发挥了关键作用。这项研究的结果突出了Bi 2Sn 2 O 7纳米结构作为太阳能氨合成的高性能催化剂的巨大潜力。
Development of effective technologies for artificial nitrogen fixation under mild conditions is of fundamental and technological significance, as the traditional production of NH3by the Haber-Bosch process entails a high energy consumption and carbon emission. In this study, Bi2Sn2O7ultrasmall nanoparticles of the pyrochlore phase are synthesized hydrothermally, and the photocatalytic activity towards nitrogen fixation is found to be modulated by the addition of sodium oleate. Among the series, the optimal sample displays a photocatalytic performance with an NH3production rate of 231 μmol g−1h−1, due to the formation of a high specific surface area, a large number of active sites for N2adsorption, and extensive lattice oxygen vacancies. In conjunction with results from first principles calculations, the Bi species around the O2-site oxygen vacancies are found to play a key role in the adsorption and activation of N2. Results from this study highlight the significant potential of Bi2Sn2O7nanostructures as high-performance catalysts for solar ammonia synthesis.Data AvailabilityData will be made available upon request from the authors.