It is crucial to design core-shell materials with interfacial interaction, which enhances their electrical conductivity, structural stability, and facilitates efficient charge transfer at the interface. In this study, two core-shell electrodes NC-O-PBA (NC: nickel cobalt layered double hydroxides, O-bridged core-shell materials) and LCCH@Ni(OH)@PBA (LCCH: linear cobalt carbonate hydroxides, PBA: prussian blue analogs) were fabricated via interfacial contrast strategy to investigate the optimization function of oxygen at core-shell interface. Results show that as-prepared NC-O-PBA with high oxygen content creates an ideal condition for the formation of oxygen bridging. Moreover, the NC-O-PBA promotes a strong bond cooperation between core (NiCo-LDH) and shell (NiCo PBAs). The unit in PBAs can partly coordinate with the oxygen (from hydroxyl groups and interlayer ions in LDH), thus forming a strong interfacial coordination bonding between LDH and PBAs (Ni/Co(LDH)-O-CN(PBAs) or Ni/Co(LDH)-O-Ni/Co(PBAs)). Subsequently, NC-O-PBA electrode presents a high capacity of 1040.6 F g at 1 A g and a retention rate of 87.5% at 1500 cycles of 3 A g, much higher than LCCH@Ni(OH)@PBA (462.4 F g and 41.26%). Finally, in-situ Raman results demonstrated the enhanced Faraday redox reaction of NC-O-PBA. This interfacial contrast strategy and oxygen-bridged approach provide a novel idea for the development of high-performance core-shell electrode materials and facilitate deeper insights into mechanism.

中文翻译：

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通过氧桥调节核壳界面相互作用以增强电化学性能

设计具有界面相互作用的核壳材料至关重要，这可以提高其导电性、结构稳定性并促进界面上的有效电荷转移。本研究中，两种核壳电极NC-O-PBA（NC：镍钴层状双氢氧化物，O桥核壳材料）和LCCH@Ni(OH)@PBA（LCCH：线性碳酸钴氢氧化物，PBA：通过界面对比策略制备了普鲁士蓝类似物，以研究氧在核-壳界面处的优化功能。结果表明，所制备的高氧含量的NC-O-PBA为氧桥的形成创造了理想的条件。此外，NC-O-PBA 促进了核 (NiCo-LDH) 和壳 (NiCo PBA) 之间的牢固键合作用。 PBA中的单元可以部分与氧（来自LDH中的羟基和层间离子）配位，从而在LDH和PBA之间形成牢固的界面配位键（Ni/Co(LDH)-O-CN(PBA)或Ni/Co (LDH)-O-Ni/Co(PBA))。随后，NC-O-PBA电极在1 A g-1时表现出1040.6 F g的高容量，在3 A g-1循环1500次后保持率为87.5%，远高于LCCH@Ni(OH)@PBA（462.4 F g）和 41.26%）。最后，原位拉曼结果证明了 NC-O-PBA 增强的法拉第氧化还原反应。这种界面对比策略和氧桥方法为高性能核壳电极材料的开发提供了新的思路，并有助于更深入地了解机理。