Molecular Engineering of Noble Metal Aerogels Boosting Electrocatalytic Oxygen Reduction,Advanced Functional Materials

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Molecular Engineering of Noble Metal Aerogels Boosting Electrocatalytic Oxygen Reduction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-05-23 , DOI: 10.1002/adfm.202302561
Hongxing Yuan ₁ , Xinhao Wan ₁ , Jianqi Ye ₁ , Tuotuo Ma ₁ , Fangyuan Ma ₁ , Jie Gao ₂ , Wei Gao ₁ , Dan Wen ₁

Affiliation

Developing robust oxygen reduction reaction (ORR) electrocatalysts with high activity and durability remains great challenging while noble metal aerogels (NMAs) hold great potential because of their hierarchically porous morphology, excellent activity, and self-supported characteristic. Herein, a general molecular engineering strategy to synthesize molecule-noble metal aerogels (M-NMAs) via 3D assembly of metal nanoparticles (e.g., Pt, Pd, Au, Ag, and PtPd NPs) induced by metalloporphyrin as cross-linkers is reported. Due to the well synergy of NMAs and porphyrin molecule in creating the facile reaction pathway for ORR catalysis, these M-NMAs demonstrate boosted ORR activity and durability in different electrolytes. Particularly, the best PtPd-based M-NMA delivers 1.47 A mg_Pt⁻¹ and 2.13 mA cm⁻² in mass and specific activities, which are 11.3 and 14.2 times higher than those of the commercial Pt/C catalyst, respectively. Thus, this work not only provides a simple and universal functional engineering approach of NMAs with catalytic molecules, but also opens an avenue of the rational design for superior ORR electrocatalysts.

中文翻译：

贵金属气凝胶促进电催化氧还原的分子工程

开发具有高活性和耐用性的强大氧还原反应（ORR）电催化剂仍然具有巨大的挑战性，而贵金属气凝胶（NMA）由于其分级多孔形态、优异的活性和自支撑特性而具有巨大的潜力。在此，报道了通过由金属卟啉作为交联剂诱导的金属纳米颗粒（例如，Pt、Pd、Au、Ag和PtPd NP）的3D组装来合成分子贵金属气凝胶（M-NMA）的通用分子工程策略。由于 NMA 和卟啉分子在创建 ORR 催化反应途径方面的良好协同作用，这些 M-NMA 在不同电解质中表现出增强的 ORR 活性和耐久性。特别是，最好的 PtPd 基 M-NMA 可提供 1.47 A mg _Pt^-1和 2.13 mA cm^{质量和比活度为-2}，分别比商业Pt/C催化剂高11.3和14.2倍。因此，这项工作不仅提供了一种简单通用的 NMA 催化分子功能工程方法，而且为合理设计优质 ORR 电催化剂开辟了一条途径。

更新日期：2023-05-23

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