基于掺杂TiO2的析氧电极材料的电催化本质研究

With the aim of reducing energy consumption and costs for solid polymer electrolyte (SPE) water electrolyzer，the project attempts to investigate the electrochemical mechanism and durability of catalyst for oxygen evolution reaction in acid media and develop the novel anode materials for water splitting. TiO2 doped by transition metal elements, such as V, Nb, Ta, W is used as a support and an assisting reagent for oxygen evolution reaction(OER). The effect of chemical composition, structure and morphology on nucleation of IrO2 and electrochemical performance are evaluated to explain the relation among composition, structure and performance. By evaluating the performance of IrO2/Ti1-xTmxO2, the project studies the influence of composition and micro-structure on electro transfer and gas-liquid mass transfer behavior, which helps to clarify assisting catalysis of Ti1-xTmxO2 and synergistic effect mechanism of the support and active components and explore the structure-activity relationship and stability of catalytic material. Not only a novel anode material for SPE can be achieved via the project, but also the structure-activity relationship of catalytic materials can be established and clearly expounded, which helps to solve the common scientific problems of catalytic materials regarding activity, stability and cost.

本项目以降低固体聚合物电解槽的能耗和成本为出发点，针对强酸性介质下析氧催化材料的催化本质及稳定性的科学问题，开发新型的水电解阳极催化材料。 项目以TiO2为基体，采用过渡金属元素Tm（V、Nb、Ta、W）进行掺杂制备载体材料，考察其组成、结构和形貌等因素对负载IrO2成核、生长和颗粒大小的影响以及相关电化学性能的影响，研究电极材料的"成分－结构－性能"关系；通过研究IrO2/Ti1-xTmxO2催化材料组分和微观结构对电子传导、气/液两相传质的影响，明晰载体的助催化本质及与IrO2活性组分之间的协同作用机制，探讨催化材料的构效关系和稳定性本质。 项目不仅获得了全新的水电解析氧催化材料，同时深化对载体和活性组分的结构-性能关系的认识，建立催化剂反应的构效关系，有效解决催化剂活性、稳定性和成本等催化材料的共性科学问题。

本项目以降低固体聚合物电解槽的能耗和成本为出发点，针对强酸性介质下析氧催化材料的催化本质及稳定性的科学问题，开发新型的水电解阳极催化剂载体材料。.项目以TiO2为基体，采用过渡金属元素Tm（V、Nb、Ta、W）进行掺杂制备载体材料，考察其组成、结构和形貌等因素对负载IrO2成核、生长和颗粒大小的影响以及相关电化学性能的影响，研究电极材料的“成分－结构－性能”关系；研究获得W掺杂浓度为10at%时，W掺杂型复合催化剂的电荷传递阻抗降低，掺杂元素促进了反应物之间的电荷传导，40IrO2/Ti0.9W0.1O2复合催化剂具有最大的催化活性面积，且耐久性良好。以Ti0.9W0.1O2为载体，制备不同IrO2担载量的复合催化剂，在1A/cm2的电流密度下，载量为60wt%的复合催化剂的极化电势仅为1.832V，远远优于纯IrO2的催化活性，有希望作为SPE的阳极材料应用。