In this work, the porous spinel-type of magnetic iron-manganese oxide nanocubes with a hollow structure deposited on the reduced graphene oxide nanoflakes ([email protected] nanocomposite) is synthesized and examined as a non-noble electrocatalyst for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). The Tafel slope of [email protected] nanocomposite is about 107 mV dec⁻¹ in the 0.50 mol L⁻¹ H₂SO₄ solution and suggests the Volmer–Heyrovsky mechanism for HER. The results show that this electrocatalyst has an excellent stability (at least 10000 cycles) in the sulfuric acid solution. Hence, The LSV curve shows that the Pt(20%)/C has a better onset-potential than present electrocatalyst for HER but [email protected] nanocomposite produces current density (j) of 300 mA cm⁻² at overpotential (ɳ) of −721 mV (ɳ₃₀₀ = −721 mV(vs. Ag/AgCl)) which is smaller than Pt(20%)/C (ɳ₃₀₀ = −802 mV). The [email protected] nanocomposite as an electrocatalyst follows four electrons mechanism for ORR in 0.10 mol L⁻¹ KOH. As an important result, after addition of methanol into the electrolyte, this electrocatalyst is stable for a long time (at least 10000s) while the catalytic activity of Pt (20%)/C is quickly lost in the presence of methanol.

在这项工作中，具有多孔结构的多孔尖晶石型磁性铁-锰氧化物纳米立方体沉积在还原的氧化石墨烯纳米薄片（[受电子邮件保护的]纳米复合材料）上，并被用作氢生成反应的非贵金属电催化剂（HER） ）和氧还原反应（ORR）。[受电子邮件保护的]纳米复合材料的Tafel斜率在0.50 mol L ^-1  H ₂ SO _4中约为107 mV dec ^-1解决方案，并提出了针对HER的Volmer-Heyrovsky机制。结果表明，该电催化剂在硫酸溶液中具有优异的稳定性（至少10000次循环）。因此，LSV曲线显示，Pt（20％）/ C比目前的HER电催化剂具有更好的启动电势，但[受电子邮件保护的]纳米复合材料在电势过高（ɳ）时产生300 mA cm ^-2的电流密度（j）-721毫伏（ɳ ₃₀₀  = -721毫伏（VS。的Ag / AgCl）），其是除Pt（20％）/ C的情况下（ɳ ₃₀₀  = -802毫伏）。[电子邮件保护的]纳米复合材料作为电催化剂遵循0.10 mol L ^-1的ORR的四电子机理KOH。重要的结果是，在向电解液中添加甲醇后，该电催化剂可长时间（至少10000s）保持稳定，而在甲醇存在下Pt（20％）/ C的催化活性迅速丧失。