Unprecedented High Oxygen Evolution Activity of Electrocatalysts Derived from Surface-Mounted Metal-Organic Frameworks
Unprecedented High Oxygen Evolution Activity of Electrocatalysts Derived from Surface-Mounted Metal-Organic Frameworks
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DOI：
10.1021/jacs.9b00549
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发表时间：
2019-04-10
影响因子：
15
通讯作者：
Fischer, Roland A.
中科院分区：
文献类型：
--
作者：
Li, Weijin;Watzele, Sebastian;Fischer, Roland A.
析氧反应(OER)是可再生能源储存的关键过程。然而，开发具有高活性、长寿命和可伸缩性的非贵金属OER电催化剂仍然是一个重大挑战。本研究发现，直接在宏微电极衬底上层层生长的定向表面贴装金属有机骨架(SURMOF)薄膜一步法制备的镍钴混合氢氧化物电催化剂在碱性溶液中具有较高的OER活性和稳定性。在300 mV的定义过电位下，得到的质量活性接近2.5 mA/g(-1)，比基准IrO2电催化剂高一个数量级，比文献中报道的任何最先进的NiFe、FeCoW或NiCo基电催化剂的质量活性高至少3.5倍。SURMOF衍生的超薄电催化剂涂层的良好形貌导致了最活跃的Ni和Co基位的高度暴露。
The oxygen evolution reaction (OER) is a key process for renewable energy storage. However, developing non-noble metal OER electrocatalysts with high activity, long durability and scalability remains a major challenge. Herein, high OER activity and stability in alkaline solution were discovered for mixed nickel/cobalt hydroxide electrocatalysts, which were derived in one-step procedure from oriented surface-mounted metal-organic framework (SURMOF) thin films that had been directly grown layer-by-layer on macro- and microelectrode substrates. The obtained mass activity of similar to 2.5 mA.mu g(-1) at the defined overpotential of 300 mV is 1 order of magnitude higher than that of the benchmarked IrO2 electrocatalyst and at least 3.5 times higher than the mass activity of any state-of-the-art NiFe-, FeCoW-, or NiCo-based electrocatalysts reported in the literature. The excellent morphology of the SURMOF-derived ultrathin electrocatalyst coating led to a high exposure of the most active Ni- and Co-based sites.