纳米颗粒(NPs)在材料表面的溶出表现出良好的性能,在催化领域具有巨大的潜力。在这项研究中,首次提出了一种两次激光处理(TLT)的方法,通过激光快速加热快速促进CoNPs溶解到(La0.7Sr0.3)0.93Ti0.93Co0.07O3(LSTC)的表面,以增强LSTC的电化学性能。通过TLT,从前体粉末稳定的钙钛矿晶体结构-CoNP在LSTC表面上的外溶的整个过程仅需≈36s。通过X射线衍射仪确认了CoNP的溶出,扫描电子显微镜和高分辨率透射电子显微镜。在TLT之后,LSTC表面出现了大量达到75粒子μm-2的CoNP,起始电位为1.38V,214mV的过电位,Tafel斜率为81.14mVdec-1,表现出良好的催化活性和长期稳定性。利用TLT快速诱导NPs析出的新工艺,能够快速制备具有更好电化学性能的纳米粒子修饰钙钛矿材料,从而丰富了exsolution技术,为表面科学研究开辟了新途径。
The
exsolution of nanoparticles (NPs) on material surfaces exhibits good performance with great potential in the field of catalysis. In this study, a method with twice lasers treatment (TLT) is proposed for the first time to rapidly promote the
exsolution of Co NPs to the surface of (La0.7Sr0.3)0.93Ti0.93Co0.07O3(LSTC) by laser rapid heating to enhance the electrochemical performance of the LSTC. The entire process from precursor powder-stable perovskite crystal structure-Co NPs
exsolution on the LSTC surface takes only ≈36 s by TLT. The Co NPs
exsolution was confirmed by x-ray diffractometer, scanning electron microscopy and high-resolution transmission electron microscopy. After TLT, a large number of Co NPs reached 75 particlesμm-2appeared on the surface of LSTC with the onset potential of 1.38 V, the overpotential of 214 mV, and the Tafel slope of 81.14 mV dec-1, showing good catalytic activity and long-term stability. The novel process of using TLT to rapidly induce exsolution of NPs enables the rapid preparation of nanoparticle-decorated perovskite materials with better electrochemical properties, thus enriching
exsolution technology and opening a new avenue for surface science research.