【摘要】 采用线性扫描伏安（LSV）、电化学阻抗谱（EIS）、恒电位极化、计时电流、扫描电镜（SEM）和X射线衍射（XRD）等方法,研究在不同电位区间硫酸铵浓度对不锈钢表面析氢和锰沉积反应的影响。结果表明,NH₄⁺的放电反应可以加速整个阴极析氢反应动力学,NH₄⁺的放电反应速率随硫酸铵浓度和过电位的增加而增加。锰在不锈钢表面的电结晶服从三维连续成核机理,晶核生长受扩散控制。增加过电位能加快形核速率,但使形核密度降低。在低电位区间,吸附于不锈钢表面的Mn²⁺优先放电;在中等电位区间,增加硫酸铵浓度能提高电流效率并生成更多块状晶体;在高电位区间,增加硫酸铵浓度会抑制形核过程,该条件下得到的晶体以柱状形态为主,且晶格中的氢含量更高。更多还原

【Abstract】 The effects of（NH₄）₂SO₄ concentration（c（（NH₄）₂SO₄））on hydrogen evolution and Mn electrodeposition on stainless steel（SS）in different potential ranges were investigated by linear sweep voltammetry（LSV）,electrochemical impedance spectroscopy（EIS）,potentiostatic polarization,chronoamperometry,scanning electron microscope（SEM）and X-ray diffraction（XRD）techniques.The results show that the NH₄⁺ discharge reaction（NDR）intensifies the overall hydrogen evolution kinetics,and the NDR is catalyzed by increasing c（（NH₄）₂SO₄）and over-potential.The electro-crystallization of Mn on SS follows a three-dimensional progressive nucleation and diffusion-limited growth mechanism.Increasing the over-potential could accelerate the nucleation rate and also cause the decline of the nucleation density.The absorbed Mn²⁺preferably discharges at low over-potential.Increasing c（（NH₄）₂SO₄）at medium over-potential could improve the current efficiency and produce more block-like grains.The nucleation process is suppressed by increasing c（（NH₄）₂SO₄）at high over-potential,at which the formation of columnar grains with higher hydrogen contents becomes prevailing.更多还原