摘要
水解制氢是将太阳能、风能等非并网绿色能源转化为化学能的有效手段之一,但其较高的阳极析氧过电位导致的水解制氢效率降低以及贵金属析氧催化剂的使用限制了其大规模应用[1]。因此,新型、高效、廉价易得的析氧催化剂的研发是实现规模化水解制氢的关键[2]。本文采用NiFe前驱体热解法制备了直径150nm,长度3-5μm的NiO/NiFe_2O_4纳米棒,N_2吸附测试表明该材料具有191.5m~2/g的比表面积,最大孔径分布为6.4nm。析氧测试表明该材料具有优异的阳极析氧催化性能,10mA/cm~2电流密度下过电位为302mV,塔菲尔斜率42mV/dec,显示出比单一NiO和NiFe_2O_4更优异的OER性能,远远优于商业的RuO_2和IrO_2材料,有望成为高效、廉价的析氧催化剂。
Development of efficient, stable and earth-abundant metal oxide electrocatalysts is crucial to improve the efficacy of water electrolysis for harvest and storage solar energy as H_2 fuel. In this work, we report the synthesis, structural characterization and electrocatalytic water oxidation performance of mesoporous NiO /NiFe_2O_4 nanorods, which is 150 nm in diameter and 3-5 μm in length with BET surface area of 191.5 m~2/g(pore size distribution at 6.4 nm). The current density of 10 mA /cm~2 is met at an overpotential of 302 mV with a Tafel slope of 42 mV /dec for NiO /NiFe_2O_4 nanorods, outperform those of individual NiO and NiFe_2O_4 phase, even exhibits much higher activity than that of RuO_2 and IrO_2, which makes it very high efficient and low-cost electrocatalyst for water splitting.
引文
[1]T.R.Cook,D.K.Dogutan,S.Y.Reece,Y.Surendranath,T.S.Teets and D.G.Nocera,Chem Rev,2010,110,6474-6502.
[2]M.Gong and H.Dai,Nano Res.,2015,8,23-39.
