Qiao Sifan, Qi Jingang, Zhang Di, Xu Aichen, Zhang Cai, Liu Shujie, Wang Bing, Liu Liang, Zhang Wei
School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, People's Republic of China.
Nanotechnology. 2019 Oct 18;30(42):425301. doi: 10.1088/1361-6528/ab3309. Epub 2019 Jul 17.
In situ exsolved nanoparticles (NPs) on surfaces perform well in many catalytic applications. Herein, an emerging technique of pulsed electric current (PEC) for facilitating NPs exsolution was firstly utilized in functional materials towards tailoring structure and morphology of materials. PEC facilitated Ni NPs exsolution in situ and the exposed active sites were highly dispersed on the LaCrO substrate surface. Such result was confirmed by combining x-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. As a consequence, PEC-treated and untreated LaCrO perovskite samples were employed as electrocatalysts for oxygen evolution reaction (OER). The PEC-treated samples exhibit obviously improved OER activity (lower overpotential, smaller Tafel slope) and lower reaction resistance than the untreated samples. This illustrates that the exsolved Ni NPs driven by PEC are beneficial for the OER performance and are probably the components of the OER active sites.
表面原位析出的纳米颗粒（NPs）在许多催化应用中表现出色。在此，一种用于促进纳米颗粒析出的新兴脉冲电流（PEC）技术首次应用于功能材料，以调整材料的结构和形态。PEC促进了Ni NPs的原位析出，并且暴露的活性位点高度分散在LaCrO衬底表面。通过结合X射线衍射、扫描电子显微镜和高分辨率透射电子显微镜证实了这一结果。因此，PEC处理和未处理的LaCrO钙钛矿样品被用作析氧反应（OER）的电催化剂。与未处理的样品相比，PEC处理的样品表现出明显改善的OER活性（更低的过电位、更小的塔菲尔斜率）和更低的反应电阻。这表明由PEC驱动析出的Ni NPs有利于OER性能，并且可能是OER活性位点的组成部分。
