涂液浓度对Ti基IrO_(2)-MnO_(x)阳极涂层形貌及析氧性能的影响  

Effect of precursor concentration on surface morphology of IrO_(2)-MnO_(x)coated titanium anode and its electrocatalytic activity for oxygen evolution reaction

作　　者：牛崇宇 刘宝 唐国章 李贵虎 侯宗斌 段路阳 杨子豪 NIU Chongyu;LIU Bao;TANG Guozhang;LI Guihu;HOU Zongbin;DUAN Luyang;YANG Zihao(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《电镀与涂饰》2023年第7期74-82,共9页Electroplating & Finishing

基　　金：河北省自然科学基金高端钢铁冶金联合基金项目(E2021209043);河北省自然科学基金创新研究群体项目(E2022209093);河北省高等学校科学技术研究项目(BJ2021034);唐山市科技计划项目(22130228H)。

摘　　要：采用溶胶凝胶法在TA1钛基体上制备了IrO_(2)–MnO_(x)涂层阳极,探析了涂液浓度对阳极涂层结构和电催化析氧性能的影响。结果表明,阳极涂层中的Ir会以金红石型IrO_(2)的形式存在,Mn则以非晶态Mn_(3)O_(4)的形式存在。阳极涂层表面呈现“类山脊状”形貌,涂液浓度的升高会提高涂层的结晶度和表面裂痕数量,但不会对涂层的表面粗糙度产生显著影响。阳极涂层的析氧催化活性表面积主要是易与电解液接触的外活性表面积,涂液浓度的变化对其影响较小。阳极的电催化析氧活性和稳定性随着涂液浓度的升高会呈现出先提高后降低的趋势。涂液浓度为0.3 mol/L时所得阳极的使用性能最优。在0.5 mol/L的硫酸溶液中,50 mA/cm^(2)的电流密度下,其析氧过电位为280 mV,预计寿命长达3年。An IrO_(2)-MnO_(x)coated titanium anode was prepared with TA1 as substrate by sol-gel method.The effect of precursor concentration on surface morphology of the Ti/IrO_(2)-MnO_(x)anode and its electrocatalytic activity for oxygen evolution reaction(OER)was studied.It was found that the Ir presented as rutile IrO_(2),while Mn existed as amorphous Mn3O4 in the oxide coating.The surface of the oxide coating showed a mountain-like morphology.The increase of precursor concentration improved the crystallinity and crack amount of the coating,but had little effect on the surface roughness of the coating.The active surface area of the coating is mainly the outer surface area which is easy to contact with the electrolyte and slightly affected by the variation of precursor concentration.The electrocatalytic activity and stability were improved initially and then declined with the increasing of precursor concentration.The optimal precursor concentration for preparation of Ti/IrO_(2)-MnO_(x)anode is 0.3 mol/L.The overpotential of this anode for OER in 0.5 mol/L H_(2)SO_(4)solution was 280 mV at a current density of 50 mA/cm^(2)and its service life was estimated to be at least 3 years.

关 键 词：钛基涂层阳极 氧化铱 氧化锰 涂液浓度 形貌 析氧反应 电催化 

分 类 号：Q643.3[生物学—生物物理学] TF803.2[冶金工程—有色金属冶金]