摘要
无机纳米材料模拟酶是化学、生命和材料等学科交叉中一个新的研究热点,近几年来仅报道了少数几种模拟超氧化物歧化酶~([1])。本文利用无模板溶剂热法制备出由超薄纳米片组装的多级结构氧化镍纳米花,并采用XRD、XPS、SEM、TEM和氮气吸附-脱附等手段对其组成与形貌进行了表征。我们首次发现氧化镍纳米花具有模拟超氧化物歧化酶催化能力。通过邻苯三酚自氧化法、稳态动力学和电化学等方法详细研究了氧化镍纳米花的催化性能和催化机理,结果表明,其催化能力大于最近报道的碳簇材料~([2]),其催化本质来源于Ni~Ⅱ/Ni~Ⅲ合适的氧化还原电位(0.683 V VS NHE)。本研究将推动氧化镍纳米材料在检测超氧阴离子和抗氧化等领域的新应用。
Inorganic nanomaterials as mimetic enzymes belong to a novel research hotspot in the interdiscipline of chemistry, life and materials. In recent years, few mimetic superoxide dismutases have been reported. Hierarchical NiO nanoflowers assembled from ultrathin nanoflakes were synthesized by a template-free solvothermal method, and their composition and morphology were characterized by XRD, XPS, SEM, TEM and Nitrogen adsorption–desorption. We firstly found the NiO nanoflowers owned the superoxide dismutase-like activity. The catalytic properties and mechanism were studied in detail by the method of pyrogallol autoxidation, steady-state kinetics and electrochemistry. The results indicated that the catalytic activity of NiO nanoflowers were higher than the recently reported carbon clusters, and the catalytic nature arised from the appropriate redox potential of Ni~Ⅱ/Ni~Ⅲ(0.683 V VS NHE). This research will promote the new applications of NiO nanomaterials in superoxide anion detection and antioxidant.
引文
[1]Wei,H.;Wang,E.;Chem.Soc.Rev.2013,42:6060.
[2]Samuel,E.L.G.;Marcano,D.C.;Berka,V.;Bitner,B.R.;Wu,G.;Potter,A.;Fabian,R.H.;Pautler,R.G.;Kent,T.A.;Tsai A.-L.;Tour,J.M.;Proc.Natl.Acad.Sci.U.S.A.2015,112:2343.
