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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A rational design of efficient trifunctional electrocatalysts derived from tailored Co2+-functionalized anionic metal-organic frameworks
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A rational design of efficient trifunctional electrocatalysts derived from tailored Co2+-functionalized anionic metal-organic frameworks

机译：源自定制二氧化碳+官能化阴离子金属 - 有机框架的高效三官能电催化剂的理性设计

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Strategies for developing efficient energy conversion and storage devices that have been optimized by designing electrode materials is a critical challenge for researchers. Herein, we report the design and synthesis of a series of Co@NC trifunctional electrocatalysts derived from rationally designed cobalt-added anion MOF precursors and preliminarily reveal the relationship between the precursor and corresponding efficient electrocatalysts. Benefiting from the special composition of Co2+-doped anion MOFs involving Co2+ chelates as the Co2+ sources, the resulting CoT@NC electrocatalyst possesses abundant Co/Co-N-x/Co-O-x and multiple active nitrogen sites that are evenly distributed. As expected, the rich variety of active species and hierarchical pore structures endow CoT@NC with excellent performances toward ORR, HER, and OER, including a high half-wave potential value of 0.86 V for ORR and low overpotential values for OER (350 mV) and HER (209 mV) at 10 mA cm(-2) in an alkaline solution. Moreover, we assembled a conventional Zn-air battery with CoT@NC as the air-cathode catalyst, which exhibited excellent rechargeable performance and ultrahigh durability. Moreover, CoT@NC coated on Ni foam was used as both anode and cathode for the overall water-splitting process, which needed a bias voltage of 1.70 V to achieve a current density of 10 mA cm(-2). This study sheds light on the design, fabrication, and regulation of highly active cobalt-based electrocatalysts with abundant active sites and tunable pore structures for electrocatalysis and other applications.
机译：开发通过设计电极材料优化的高效能量转换和存储设备的策略是研究人员的关键挑战。在此，我们报告了来自合理设计的钴的阴离子MOF前体的一系列CO @ NC三官能电催化剂的设计和合成，并预先揭示了前体和相应有效电催化剂之间的关系。受益于涉及CO2 +螯合物作为CO2 +源的CO2 +掺杂的CO2 +的阴离子MOF的特殊组合物，所得的COT @ NC电催化剂具有均匀分布的丰富的CO / CO-X / CO-O-X和多个活性氮位点。正如预期的那样，丰富的活性物种和分层孔结构赋予COT @ NC，其朝向ORR，HER和OER的出色性能优异，包括OER的ORR和低过电位值为0.86V的高半波电位值（350 mV ）和她（209mV）在碱性溶液中的10 mA cm（-2）。此外，我们用COT @ NC组装了传统的Zn空气电池作为空气阴极催化剂，其表现出优异的可充电性能和超高耐久性。此外，在Ni泡沫上涂覆在Ni泡沫上的COT @ NC作为整个水分解过程的阳极和阴极，其偏置电压为1.70V以实现10 mA cm（-2）的电流密度。本研究阐明了高活性钴基电催化剂的设计，制造和调节，具有丰富的活性位点和可调谐孔隙结构，用于电常放和其他应用。

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