Boosting Both Electrocatalytic Activity and Durability of Metal Aerogels via Intrinsic Hierarchical Porosity and Continuous Conductive Network Backbone Preservation
Boosting Both Electrocatalytic Activity and Durability of Metal Aerogels via Intrinsic Hierarchical Porosity and Continuous Conductive Network Backbone Preservation
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通过固有的分级孔隙率和连续导电网络主干保护来提高金属气凝胶的电催化活性和耐久性
DOI：
10.1002/aenm.202002276
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Wei Liu
中科院分区：
文献类型：
--
作者：
Yuanyuan Zheng;Jing Yang;Xubing Lu;Honglei Wang;Amare Aregahegn Dubale;Yi Li;Zhao Jin;Dongyang Lou;Navpreet Kaur Sethi;Yuhong Ye;Jing Zhou;Yujing Sun;Zhikun Zheng;Wei Liu
金属气凝胶作为一类具有连续导电性金属网络骨架的新型多孔材料，在各个领域尤其是电催化领域都释放出巨大的潜力。然而，由于金属气凝胶的脆性导致其结构在常规电极制备过程中发生破坏，因此如何最大限度地利用其固有的结构优势仍然是一个巨大的挑战。本文开发了一种通用的原位硅胶凝胶策略，将金属气凝胶（PtPd, PtAg， PdAg和AuAg）整合到大孔骨架（碳布，碳纤维泡沫和镍泡沫）中。该复合材料具有良好的机械柔韧性，可以在保持金属气凝胶固有结构的前提下直接使用。这不仅导致更有效的电子传递和更快的质量传递，而且还消除了奥斯特瓦尔德成熟和聚集，导致与传统的折叠和压缩结构的墨滴涂层相比，活性和耐用性显着提高。这项工作代表了金属气凝胶的重大突破，并为设计高活性和耐用的电催化剂提供了灵感。
As an emerging class of highly and hierarchically porous materials with continuous conductive metal network backbones, metal aerogels have unleashed tremendous potential in various fields, especially in electrocatalysis. However, it remains a great challenge to maximize the utilization of the intrinsic structural advantages of metal aerogels due to the collapse of their structure during conventional electrode preparation caused by their brittle character. Herein, a general in situ silicone‐confined gelation strategy is developed to integrate metal aerogels (PtPd, PtAg, PdAg, and AuAg) into/onto macroporous skeletons (carbon cloth, carbon fiber foam, and nickel foam). The composite materials have good mechanical flexibility, and can be utilized directly under the condition of well‐preserved intrinsic structure of metal aerogels. This not only results in more efficient electron transfer and faster mass transport, but also eliminates Ostwald ripening and aggregation, leading to both remarkably enhanced activity and durability when compared to that made by conventional ink drop coating with collapsed and compressed structure. This work represents a significant breakthrough for metal aerogels, and provides inspiration for electrocatalyst design with both high activity and durability.