Zhu Weiran, Hao Nan, Chen Chen, Qiu Yu, Zuo Yanli, Wei Jie, Qian Jing, Wang Kun
Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Inorg Chem. 2022 May 16;61(19):7459-7466. doi: 10.1021/acs.inorgchem.2c00521. Epub 2022 Apr 29.
The performance-enhancing strategy of a single pathway for perovskite has been widely studied. In this work, the dual-pathway strategy of A-site Ce substitution and nitric acid selective dissolution was proposed. The catalytic oxidation performance of LaMnO exhibits the characteristic of hierarchical regulation, that is, a steplike improvement, which avoids the limitation of performance improvement of the single pathway. The B-site Mn with catalytic activity was in situ reconstituted on the surface to build a Mn-rich surface. The obtained sdLaCeMnO has the advantages of good oxygen mobility, high Mn/Mn molar ratio, and large specific surface area, and this material showed excellent catalytic oxidation performance for organics, which can realize colorimetric chemical oxygen demand detection at room temperature. Here, Ce substitution improved the oxidation capacity by improving the oxygen mobility and the ratio of Mn/Mn, and further nitric acid treatment not only accelerated the in situ reconstruction of B-site Mn but also increased the specific surface area.
钙钛矿单途径性能增强策略已得到广泛研究。在这项工作中，提出了A位Ce取代和硝酸选择性溶解的双途径策略。LaMnO的催化氧化性能呈现出分级调控的特征，即阶梯式提升，这避免了单途径性能提升的局限性。具有催化活性的B位Mn在表面原位重构以构建富Mn表面。所制备的sdLaCeMnO具有氧迁移率良好、Mn/Mn摩尔比高和比表面积大的优点，该材料对有机物表现出优异的催化氧化性能，可在室温下实现比色法化学需氧量检测。在此，Ce取代通过提高氧迁移率和Mn/Mn比来提高氧化能力，进一步的硝酸处理不仅加速了B位Mn的原位重构，还增加了比表面积。
