School of Chemistry and Chemical Engineering, Shandong University, Ji'nan, 250100, China.
Physical Chemistry, Technische Universität Dresden, 01069, Dresden, Germany.
Adv Mater. 2024 Oct;36(41):e2405200. doi: 10.1002/adma.202405200. Epub 2024 Aug 13.
Bimetallic nanostructures are promising candidates for the development of enzyme-mimics, yet the deciphering of the structural impact on their catalytic properties poses significant challenges. By leveraging the structural versatility of nanocrystal aerogels, this study reports a precise control of Au-Pt bimetallic structures in three representative structural configurations, including segregated, alloy, and core-shell structures. Benefiting from a synergistic effect, these bimetallic aerogels demonstrate improved peroxidase- and glucose oxidase-like catalytic performances compared to their monometallic counterparts, unleashing tremendous potential in catalyzing the glucose cascade reaction. Notably, the segregated Au-Pt aerogel shows optimal catalytic activity, which is 2.80 and 3.35 times higher than that of the alloy and core-shell variants, respectively. This enhanced activity is attributed to the high-density Au-Pt interface boundaries within the segregated structure, which foster greater substrate affinity and superior catalytic efficiency. This work not only sheds light on the structure-property relationship of bimetallic catalysts but also broadens the application scope of aerogels in biosensing and biological detections.
双金属纳米结构是酶模拟物开发的有前途的候选者，但解析其结构对催化性能的影响仍面临重大挑战。本研究利用纳米晶体气凝胶的结构多功能性，以三种代表性结构构型（包括隔离、合金和核壳结构）精确控制了 Au-Pt 双金属结构。得益于协同效应，这些双金属气凝胶表现出比其单金属对应物更高的过氧化物酶和葡萄糖氧化酶样催化性能，在催化葡萄糖级联反应方面展现出巨大的潜力。值得注意的是，隔离 Au-Pt 气凝胶表现出最佳的催化活性，分别比合金和核壳变体高出 2.80 和 3.35 倍。这种增强的活性归因于隔离结构内高密度的 Au-Pt 界面边界，促进了更大的底物亲和力和更高的催化效率。这项工作不仅揭示了双金属催化剂的结构-性能关系，还拓宽了气凝胶在生物传感和生物检测中的应用范围。
