Bangfeng Zong, Xiaojun Pan, Lifang Zhang, Bo Wei, Xiangxiong Feng, Miao Guo, Duanhao Cao, Feng Ye
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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.
钙钛矿对电解水的析氧反应（OER）具有催化作用。通过特定的制备方法掺杂元素是获得高催化活性钙钛矿催化剂的良好策略。本文采用溶胶-凝胶法制备了掺杂不同比例镍的La0.5Sr0.5Co1-xNixO3-δ钙钛矿材料。电化学测量结果表明，对于1 M KOH溶液中的OER，溶胶-凝胶法制备的La0.5Sr0.5Co0.8Ni0.2O3-δ仅需213 mV的过电位即可达到10 mA cm-2，明显低于水热法制备的La0.5Sr0.5Co0.8Ni0.2O3-δ，提高了约45.24% （10 mA cm-2时提高了389 mV）。此外，溶胶-凝胶法制备的La0.5Sr0.5Co0.8Ni0.2O3-δ在碱性介质中可保持稳定30 h而不发生降解。这表明制备的La0.5Sr0.5Co0.8Ni0.2O3-δ具有较好的OER性能。x射线衍射（XRD）结果表明，形成的主要相为SrCO3，这是该方法的缺点。碳酸盐相可能会影响性能的提高。扫描电镜（SEM）结果表明，溶胶-凝胶法制备的层状La0.5Sr0.5Co0.8Ni0.2O3-δ比水热法制备的球形颗粒状La0.5Sr0.5Co0.8Ni0.2O3-δ表面孔隙更多，孔径约为0.362 μm；x射线光电子能谱（XPS）结果表明，镍掺杂后的La0.5Sr0.5Co0.8Ni0.2O3-δ的晶格被拉长，Co的电子构型也因溶胶-凝胶法制备过程而发生改变。La0.5Sr0.5Co0.8Ni0.2O3-δ电催化性能的提高可能是由于溶胶-凝胶过程中形成的孔隙结构提供了更多的活性位点，以及溶胶-凝胶法掺杂Ni提高了氧的迁移率。使用溶胶-凝胶方法的掺杂策略为优化钙钛矿的催化性能提供了有价值的见解。
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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