Ni2O3-modified SrTiO3 for enhanced visible-light photocatalytic CO2 reduction activity

IF 1.5 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qi Zhang, Yuan Kong, Yang Ge, Yao Zhang, Junwei Liang, J. Chen, Hangxiang Wang, Quanhong Ma, Jiancheng Zhou
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Abstract

Abstract. Low-cost and effective cocatalyst Ni2O3 was loaded on SrTiO3 (STO) via a simple one-step hydrothermal method. The Ni2O3  /  SrTiO3  (  m  )   photocatalysts were systematically characterized and applied to visible-light-driven CO2 reduction to investigate their photocatalytic activity. The series of the Ni2O3-modified SrTiO3 photocatalysts presented an improved photocatalytic activity and stability. Here, the N5.4STO  (  m  )   catalyst showed the best photocatalytic activity, with CO and CH4 yielding up to 11.57 and 1.51  μmol  /  g, respectively, under visible-light irradiation of 3 h, which were 3.15 and 14.84 times higher than that of pure STO(m), respectively. Based on the characterization and experimental results, the enhanced photocatalytic activity might be attributed to the following reasons: (1) Ni2O3 well dispersed on SrTiO3 served as CO2 attachment sites; (2) the modification of Ni2O3 could red shift the absorption edge and broaden the visible-light response ability; and (3) Ni2O3 nanoparticles act as electron traps to capture photogenerated electrons, effectively blocking the recombination of electron–hole pairs. The work offers important insights into the design of non-noble metal oxide cocatalyst modified photocatalysts for electron capture and photoreduction.
ni2o3修饰SrTiO3增强可见光光催化CO2还原活性
摘要采用简单的一步水热法在SrTiO3 (STO)上负载了低成本、高效的助催化剂Ni2O3。对Ni2O3 / SrTiO3 (m)光催化剂进行了系统表征,并将其应用于可见光驱动的CO2还原中,考察了其光催化活性。ni2o3修饰的SrTiO3光催化剂具有较好的光催化活性和稳定性。其中,N5.4STO (m)催化剂表现出最好的光催化活性,在可见光照射3 h下,CO和CH4的产率分别达到11.57和1.51 μmol / g,分别是纯STO(m)的3.15和14.84倍。基于表征和实验结果,光催化活性的增强可能归因于以下原因:(1)Ni2O3在SrTiO3上分散良好,成为CO2的附着位点;(2) Ni2O3改性能使吸收边红移,可见光响应能力变宽;(3) Ni2O3纳米颗粒作为电子陷阱捕获光生电子,有效阻止电子-空穴对的复合。这项工作为设计用于电子捕获和光还原的非贵金属氧化物修饰光催化剂提供了重要的见解。
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来源期刊
Journal of Photonics for Energy
Journal of Photonics for Energy MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
3.20
自引率
5.90%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Journal of Photonics for Energy publishes peer-reviewed papers covering fundamental and applied research areas focused on the applications of photonics for renewable energy harvesting, conversion, storage, distribution, monitoring, consumption, and efficient usage.
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