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本文成功合成了多功能的碳包覆Ni@NiO纳米复合材料,并将其用作析氧反应和氧还原反应催化剂以及锂离子电池的负极材料.扫描电镜和透射电镜照片表明Ni@NiO@C纳米复合物具有均一的球形核壳结构.将Ni@NiO@C纳米复合物用作氧还原反应的催化剂时,在浓度为0.1 mol L~(-1)的氢氧化钾溶液中以1600 rpm转速下连续反应15小时后,电流密度仍然可以保持在初始值的90%以上.作为析氧反应的催化剂时,在电流密度为10 mA cm~(-2)时Ni@NiO@C纳米复合物的活性电位是380 mV(vs.RHE).同时线性拟合的塔菲尔斜率为55 mV dec~(-1).Ni@NiO@C纳米复合物被用作锂离子电池的负极材料时,在电流密度为200mA g~(-1)下循环400圈后,电池容量还可以达到750mA hg~(-1).结果表明,Ni@NiO@C纳米复合物用于氧还原反应、析氧反应和锂离子电池均具有优异的电化学性能.
In this paper, a multi-functional carbon-coated Ni @ NiO nanocomposite has been successfully synthesized and used as a catalyst for oxygen evolution reaction and oxygen reduction reaction as well as a negative electrode material for lithium ion batteries. SEM and TEM images show that Ni @ NiO @ C The nanocomposites have a uniform spherical core-shell structure.Using the Ni @ NiO @ C nanocomposite as a catalyst for the oxygen reduction reaction, the Ni @ NiO @ C nanocomposite was precipitated in a potassium hydroxide solution with a concentration of 0.1 mol L -1 at 1600 rpm After 15 hours of continuous reaction, the current density can still be maintained at more than 90% of the initial value.As a catalyst for the oxygen evolution reaction, Ni @ NiO @ C nano-composite with a current density of 10 mA cm -2 The active potential is 380 mV (vs. RHE) and the Taffel slope of the linear fit is 55 mV dec -1. When Ni @ NiO @ C nanocomposites are used as negative electrode materials for lithium-ion batteries, The results show that Ni @ NiO @ C nanocomposites can be used for oxygen reduction reaction, oxygen evolution reaction, and oxygen evolution reaction at 400 mA cycles with a current density of 200 mA g ~ (-1) Lithium-ion batteries have excellent electrochemical properties.