摘要
我们利用一步水热法构建了铁镍层状双氢氧化物/碳纳米管交联三维石墨烯网络复合材料,研究发现其催化析氧的性能远高于平面型铁镍层状双氢氧化物(Fe Ni-LDH),这种独特的三维复合结构具有更小的过电位,降低了电荷传输电阻及催化析氧反应过程中界面上的电荷转移电阻,从而提高了析氧反应的催化效率。另外,我们发现这种复合催化剂对氧还原反应同样有催化作用,使得它能够作为双功能催化剂,可潜在用于金属–空气电池等电化学能量转换和储存领域。
An efficient electrocatalyst for oxygen evolution has been prepared via the deposition of iron-nickel layered double hydroxide(Fe Ni-LDH) nanosheets on three-dimensional(3D) carbon network as the building scaffold in a one-step hydrothermal process. It is found that upon the assembling of Fe Ni-LDH nanosheets with graphene into the 3D cross-linked hybrid, the Fe Ni-LDH/graphene hybrid features a well improved catalytic activity towards the oxygen evolution reaction(OER) with a good stability during the long-term cycling experiment. Moreover, the hybrid catalyst is also active in the oxygen reduction reaction(ORR), qualifying it as a new type of bi-functional catalyst that could work in metal-air batteries.
引文
[1]Hu C.G,Cheng H.H,Zhao Y.Adv.Mater.2012,24:5493-5498.
[2]胡传刚,程虎虎,赵扬.先进材料.2012,24:5493-5498.