Bangfeng Zong, Xiaojun Pan, Lifang Zhang, Bo Wei, Xiangxiong Feng, Miao Guo, Duanhao Cao, Feng Ye
{"title":"Preparation and Performance of Nickel-Doped LaSrCoO<sub>3</sub>-SrCO<sub>3</sub> Composite Materials for Alkaline Oxygen Evolution in Water Splitting.","authors":"Bangfeng Zong, Xiaojun Pan, Lifang Zhang, Bo Wei, Xiangxiong Feng, Miao Guo, Duanhao Cao, Feng Ye","doi":"10.3390/nano15030210","DOIUrl":null,"url":null,"abstract":"<p><p>Perovskites exhibit catalytic properties on the oxygen evolution reaction (OER) in water electrolysis. Elemental doping by specific preparation methods is a good strategy to obtain highly catalytical active perovskite catalysts. In this work, La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>1-x</sub>Ni<sub>x</sub>O<sub>3-δ</sub> perovskite materials doped with different ratios of nickel were successfully synthesized by the sol-gel method. The electrochemical measurement results show that for OER in 1 M KOH solution, La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> prepared by the sol-gel method requires only a low overpotential of 213 mV to reach 10 mA cm<sup>-2</sup>, which is significantly lower than that of La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> prepared by the hydrothermal method for the increasing about 45.24% (389 mV at 10 mA cm<sup>-2</sup>). In addition, La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> by the sol-gel method can be kept stable in an alkaline medium tested for 30 h without degradation. This indicates that the prepared La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> has better OER performance. The X-ray diffraction (XRD) results show that SrCO<sub>3</sub> is the main phase formed, which is a disadvantage of this method. The performance improvement may be affected by the carbonate phase. The scanning electron microscopy (SEM) results show that layer structured La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> by the sol-gel method has more surface pores with a pore diameter of about 0.362 μm than spherical granular structured La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> by the hydrothermal method. X-ray photoelectronic spectroscopy (XPS) results reveal that the crystal lattice of La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> by nickel doping is lengthened, and the electronic configuration of Co is also changed by the sol-gel preparation process. The improved electrocatalytic performance of La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3-δ</sub> may be attributed to the pore structure formed providing more active sites during the sol-gel process and the improved oxygen mobility with Ni doping by the sol-gel method. The doping strategy using the sol-gel method provides valuable insights for optimizing perovskite catalytic properties.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"15 3","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11821170/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nanomaterials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.3390/nano15030210","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Perovskites exhibit catalytic properties on the oxygen evolution reaction (OER) in water electrolysis. Elemental doping by specific preparation methods is a good strategy to obtain highly catalytical active perovskite catalysts. In this work, La0.5Sr0.5Co1-xNixO3-δ perovskite materials doped with different ratios of nickel were successfully synthesized by the sol-gel method. The electrochemical measurement results show that for OER in 1 M KOH solution, La0.5Sr0.5Co0.8Ni0.2O3-δ prepared by the sol-gel method requires only a low overpotential of 213 mV to reach 10 mA cm-2, which is significantly lower than that of La0.5Sr0.5Co0.8Ni0.2O3-δ prepared by the hydrothermal method for the increasing about 45.24% (389 mV at 10 mA cm-2). In addition, La0.5Sr0.5Co0.8Ni0.2O3-δ by the sol-gel method can be kept stable in an alkaline medium tested for 30 h without degradation. This indicates that the prepared La0.5Sr0.5Co0.8Ni0.2O3-δ has better OER performance. The X-ray diffraction (XRD) results show that SrCO3 is the main phase formed, which is a disadvantage of this method. The performance improvement may be affected by the carbonate phase. The scanning electron microscopy (SEM) results show that layer structured La0.5Sr0.5Co0.8Ni0.2O3-δ by the sol-gel method has more surface pores with a pore diameter of about 0.362 μm than spherical granular structured La0.5Sr0.5Co0.8Ni0.2O3-δ by the hydrothermal method. X-ray photoelectronic spectroscopy (XPS) results reveal that the crystal lattice of La0.5Sr0.5Co0.8Ni0.2O3-δ by nickel doping is lengthened, and the electronic configuration of Co is also changed by the sol-gel preparation process. The improved electrocatalytic performance of La0.5Sr0.5Co0.8Ni0.2O3-δ may be attributed to the pore structure formed providing more active sites during the sol-gel process and the improved oxygen mobility with Ni doping by the sol-gel method. The doping strategy using the sol-gel method provides valuable insights for optimizing perovskite catalytic properties.
期刊介绍：
Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.
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