Wang Ziqiang, Tian Pengjun, Zhang Hugang, Deng Kai, Yu Hongjie, Xu You, Li Xiaonian, Wang Hongjing, Wang Liang
State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
Inorg Chem. 2023 Apr 10;62(14):5622-5629. doi: 10.1021/acs.inorgchem.3c00174. Epub 2023 Mar 25.
Engineering two-dimensional (2D) metallic nanomaterials has attracted numerous research interests for oxygen reduction reaction (ORR) due to their highly exposed unsaturated metal atoms and excellent physicochemical properties. Herein, we report a CO-confined growth strategy for the synthesis of 2D PdCu bimetallene with several atomic layers for ORR. The incorporation of Cu into Pd metallene can generate strain effect and change the electronic structure, weakening the interaction between Pd and CO and suppressing the adsorption of CO. Therefore, the synthesized PdCu bimetallene exhibits remarkable catalytic performance for alkaline ORR, with mass and specific activities of 0.82 A mg and 1.01 mA cm, which are 5.1 and 3.7 times those for Pt/C, respectively. Meanwhile, the PdCu bimetallene shows no decrease in ORR activity after 5000 cycles. This work highlights the design of ultrathin bimetallic 2D nanomaterials for efficient ORR electrocatalysis.
由于二维（2D）金属纳米材料具有高度暴露的不饱和金属原子和优异的物理化学性质，其工程化已在氧还原反应（ORR）方面引起了众多研究兴趣。在此，我们报告了一种用于合成具有几个原子层的二维PdCu双金属烯以用于ORR的CO限制生长策略。将Cu掺入Pd金属烯中可产生应变效应并改变电子结构，减弱Pd与CO之间的相互作用并抑制CO的吸附。因此，合成的PdCu双金属烯对碱性ORR表现出卓越的催化性能，质量活性和比活性分别为0.82 A mg和1.01 mA cm，分别是Pt/C的5.1倍和3.7倍。同时，PdCu双金属烯在5000次循环后ORR活性没有下降。这项工作突出了用于高效ORR电催化的超薄双金属二维纳米材料的设计。
