通过简单的液相氧化还原反应，使用亚铁离子对α-MnO2一维纳米棒做表面刻蚀改性，获得了不同刻蚀程度的α-MnO2纳米棒。电化学研究表明，20%刻蚀条件下获得的纳米棒相较原样的氧还原反应活性得到提高（半波电位0.79 V对0.75 V）且加速了氧还原反应的动力学过程。与之相反的是30%过度刻蚀的纳米棒的氧还原性能和导电性则大幅度下降。氧还原性能的提升归因于材料缺陷的产生，降低了Mn4+的含量，从而使Mn3+活性位点相对提高，加速了O2吸附这一速控步骤，加快了氧还原反应的动力学过程。30%过度的刻蚀使得材料的导电性降低，导致了催化性能的下降。结果表明，适度的刻蚀能调和刻蚀作用在缺陷暴露和导电性的削弱方面的矛盾，从而获得高效的氧还原电催化剂。

One dimensional α-MnO2 nanorods were etched for surface modification by ferrous ion，and the nanorods with different etching degrees were obtained by a facile liquid phase redox reaction.Electrochemical studies indicated that the nanorods obtained under 20% etching conditions had higher activity than the pristine α-MnO2 and showed the accelerating kinetic process for the oxygen reduction reaction（ORR）.On the contrary，30% over etched nanorods exhibited worse oxygen reduction and lower electrical conductivity.The improvement of ORR performance is attributed to the reduce of the Mn4+ and the rise of more Mn3+ active sites caused by the defects of the materials，which can accelerates the speed controlling step of O2 adsorption and the kinetic process of ORR.Excessive etching of 30% resulted in a significant decrease in the electrical con ductivity and a decline in the ORR performance.The results showed that moderate etching can make a balance between the defects exposure and electrical conductivity，and thus leading to high efficient oxygen reduction electrocatalysts.