Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.
J Am Chem Soc. 2022 Sep 14;144(36):16480-16489. doi: 10.1021/jacs.2c05299. Epub 2022 Aug 29.
The pace of nanomaterial discovery for high-performance electrocatalysts could be accelerated by the development of efficient screening methods. However, conventional electrochemical characterization via drop-casting is inherently inaccurate and time-consuming, as such ensemble measurements are serially performed through nanocatalyst synthesis, morphological characterization, and performance testing. Herein, we propose a rapid electrochemical screening method for bimetallic electrocatalysts that combines nanoparticle (NP) preparation and performance testing at the single NP level, thus avoiding any inhomogeneous averaging contribution. We employed single NP collision electrochemistry to realize in situ electrodeposition of a precisely tunable Pt shell onto individual parent NPs, followed by instantaneous electrocatalytic measurement of the newborn bimetallic core-shell NPs. We demonstrated the utility of this approach by screening bimetallic Au-Pt NPs and Ag-Pt NPs, thereby exhibiting promising electrocatalytic activity at optimal atomic ratios for methanol oxidation and oxygen reduction reactions, respectively. This work provides a new insight for the rapid screening of other bimetallic electrocatalysts.
通过开发高效的筛选方法，可以加速高性能电催化剂的纳米材料发现速度。然而，通过滴铸进行的传统电化学表征方法本质上是不准确和耗时的，因为这种整体测量是通过纳米催化剂合成、形态特征和性能测试依次进行的。在此，我们提出了一种用于双金属电催化剂的快速电化学筛选方法，该方法将纳米颗粒（NP）的制备和单个 NP 水平的性能测试相结合，从而避免了任何不均匀的平均贡献。我们采用单个 NP 碰撞电化学实现了对单个母 NP 进行精确可调的 Pt 壳的原位电沉积，然后对新生的双金属核壳 NP 进行即时电催化测量。我们通过筛选双金属 Au-Pt NPs 和 Ag-Pt NPs 证明了该方法的实用性，从而分别在甲醇氧化和氧还原反应的最佳原子比下表现出有前景的电催化活性。这项工作为其他双金属电催化剂的快速筛选提供了新的见解。
