Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States.
Davidson School of Chemical Engineering, Purdue University , West Lafayette, Indiana 47907, United States.
Nano Lett. 2017 Jun 14;17(6):3391-3395. doi: 10.1021/acs.nanolett.7b00046. Epub 2017 May 11.
Precious metals have broad applications in modern industry and renewable energy technologies. The high cost and limited availability of these materials, however, have caused a grand challenge for sustainability. Here, we report on the plating of a precious metal on nonprecious metal nanoparticles for the development of sustainable electrocatalysts. Cobalt/platinum core/shell (denoted as Co@Pt) nanoparticles were synthesized via seed-mediated growth. The Co seeds were first synthesized by thermal decomposition of cobalt carbonyl, and the Pt shell was overgrown in situ by adding platinum acetylacetonate (Pt(acac)). The galvanic replacement reaction between Co and the Pt precursor was successfully suppressed by taking advantage of CO (generated from the decomposition of cobalt carbonyl) as the stabilizing ligand and/or reducing agent. The obtained Co@Pt nanoparticles were further found to exhibit enhanced catalytic activity for the oxygen reduction reaction (ORR).
贵金属在现代工业和可再生能源技术中有广泛的应用。然而，这些材料的高成本和有限的可用性给可持续性带来了巨大的挑战。在这里，我们报告了在非贵金属纳米颗粒上电镀贵金属以开发可持续电催化剂的情况。通过种子介导生长合成了钴/铂核/壳（表示为 Co@Pt）纳米颗粒。首先通过热分解二羰基钴合成 Co 种子，然后通过添加乙酰丙酮铂（Pt(acac)）原位生长 Pt 壳。通过利用 CO（由二羰基钴分解产生）作为稳定配体和/或还原剂，成功抑制了 Co 与 Pt 前体之间的电置换反应。进一步发现所得到的 Co@Pt 纳米颗粒对氧还原反应（ORR）表现出增强的催化活性。
