Self-Templated Synthesis of CoFeP @ C Cage-In-Cage Superlattices for Enhanced Electrocatalytic Water Splitting
Self-Templated Synthesis of CoFeP @ C Cage-In-Cage Superlattices for Enhanced Electrocatalytic Water Splitting
复制标题
自模板化合成 CoFeP@–C 笼–In–笼超晶格用于增强电催化水分解
DOI：
10.1002/aenm.202202394
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发表时间：
2022-09-15
影响因子：
27.8
通讯作者：
Li, Tongtao
中科院分区：
文献类型：
--
作者：
Deng, Yuwei;Cao, Yangfei;Li, Tongtao
设计高效、经济、稳定的水裂解电催化剂对可再生能源技术的实施具有重要意义。在此，采用自模板策略来制造具有笼中笼超晶格结构的异质金属磷化物的2D多孔电催化剂。制成的异金属磷化物电催化剂包括紧密嵌入相互连接的碳笼框架中的一层紧密堆积的CoFeP纳米笼，通过一步磷化作用从碳涂层的CoFeO纳米晶体超晶格转化而来。得益于独特的分级多孔结构和调节Co/Fe摩尔比的能力，这种2D CoFeP @ C笼中笼超晶格在碱性介质中对析氧反应（OER）和析氢反应（HER）都表现出显著的活性和稳定性。此外，使用CoFeP @ C超晶格作为阴极和阳极构建的水电解槽需要1.55 V的低电池电压来实现10 mA cm（-2）的电流密度，优于先前报道的大多数非贵金属基电催化剂。通过密度泛函理论计算，揭示了CoFeP @ C超晶格的上级电催化性能.这些发现为开发高效稳定的双功能水裂解电催化剂提供了新的机遇。
Designing highly-efficient, cost-effective, and stable electrocatalysts for water splitting is of great significance for implementing renewable energy technologies. Herein, a self-templated strategy is employed to fabricate 2D porous electrocatalysts of heterometallic phosphides featuring a cage-in-cage superlattice architecture. The as-made heterometallic phosphide electrocatalysts, comprising a layer of close-packed CoFeP nanocages intimately embedded in an interconnected carbon-cage framework, are converted from carbon-coated CoFeO nanocrystal superlattices by one-step phosphidation. Benefiting from the unique hierarchical porous structure and the ability of modulating the Co/Fe molar ratio, such 2D CoFeP @ C cage-in-cage superlattices show remarkable activity and stability for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media. Moreover, water electrolyzers constructed using CoFeP @ C superlattices as both cathode and anode require a low cell voltage of 1.55 V to achieve a current density of 10 mA cm(-2), outperforming most nonprecious metal-based electrocatalysts reported previously. The superior electrocatalytic performance of CoFeP @ C superlattices is revealed by density functional theory calculations. These findings provide new opportunities for developing efficient and stable bifunctional electrocatalysts for water splitting.