Haryński Łukasz, Grochowska Katarzyna, Karczewski Jakub, Ryl Jacek, Rysz Jakub, Siuzdak Katarzyna
Centre for Plasma and Laser Engineering, The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences Fiszera 14 St. 80-231 Gdansk Poland
Faculty of Applied Physics and Mathematics, Gdansk University of Technology Narutowicza 11/12 St. 80-233 Gdansk Poland.
RSC Adv. 2020 Dec 23;11(1):219-228. doi: 10.1039/d0ra07563a. eCollection 2020 Dec 21.
Here, we report significant activity towards the oxygen evolution reaction (OER) of spherical nickel nanoparticles (NPs) electrodeposited onto free-standing TiO nanotubes (TNT) cyclic voltammetry. It has been shown that simple manipulation of processing parameters, including scan rate and number of cycles, allows for formation of the NPs in various diameters and amounts. The polarization data with respect to transmission electron microscopy (TEM) allowed for determination of the diameter and propagation depth of the Ni NPs leading to the highest activity towards the OER with an overpotential of 540 mV at +10 mA cm and Tafel slope of 52 mV per decade. X-ray photoelectron spectroscopy (XPS) indicates the presence of structure defects within Ni NPs whereas Mott-Schottky analysis provides information on the anodically shifted flat band potential and highly increased donor density. The obtained results along with literature studies allowed a proposal of the origin of the enhancement towards the OER. We believe that combination of transition metal-based NPs and TNT provides valuable insight on efficient and low-cost electrocatalysts.
在此，我们报告了通过循环伏安法在自支撑二氧化钛纳米管（TNT）上电沉积的球形镍纳米颗粒（NPs）对析氧反应（OER）具有显著活性。结果表明，简单地操控包括扫描速率和循环次数在内的工艺参数，就能形成不同直径和数量的纳米颗粒。结合透射电子显微镜（TEM）的极化数据，可确定对OER活性最高的镍纳米颗粒的直径和扩散深度，在 +10 mA cm² 时过电位为540 mV，塔菲尔斜率为每十倍频程52 mV。X射线光电子能谱（XPS）表明镍纳米颗粒内部存在结构缺陷，而莫特-肖特基分析提供了关于阳极偏移平带电位和施主密度大幅增加的信息。所得结果与文献研究共同为OER活性增强的起源提出了一种推测。我们认为，过渡金属基纳米颗粒与TNT的结合为高效且低成本的电催化剂提供了有价值的见解。
