Abstract Hierarchical nanoporous (HNP) NiCoO2/Ni composite is directly fabricated by one-step dealloying of NiCoAl ternary alloy in mild alkaline solution. HNP-NiCoO2/Ni composite is composed of three dimensional interlinking ligament backbone and open hollow channels with rich mesopores and macropores penetrating through. HNP-NiCoO2/Ni possesses preferable structure advantages to construct sensing platform in term of large surface area, robust multimodal porous architecture, as well the incorporation of well conductive Ni. As is expected, exceptional electrochemical sensing performances are achieved over HNP-NiCoO2/Ni with high sensitivity, superior selectivity, and long term durability toward DA assay even without any activation pretreatment. Especially, HNP-NiCoO2/Ni exhibits a wide linear detection range from 1 to 800 μM with a rapid response in ~2.8 s and a detection limit as low as 0.12 μM. Furthermore, HNP-NiCoO2/Ni also shows a good anti-interference toward DA detection in the presence of AC, glucose, H2O2, Cl−, K+, and Na+. Along with the merits of simple preparation, low cost, and excellent electrocatalytic performances, the as-prepared HNP-NiCoO2/Ni presents promising application potential to construct highly sensitive electrochemical sensors for DA assay.

中文翻译：

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基于分层纳米多孔NiCoO2/Ni复合材料的多巴胺高灵敏度检测

摘要 通过在弱碱性溶液中对 NiCoAl 三元合金进行一步脱合金直接制备分层纳米多孔 (HNP) NiCoO2/Ni 复合材料。HNP-NiCoO2/Ni 复合材料由三维互连的韧带骨架和开放的中空通道组成，具有丰富的介孔和大孔穿透。HNP-NiCoO2/Ni在大表面积、坚固的多模态多孔结构以及导电性良好的Ni的掺入方面具有构建传感平台的优选结构优势。正如预期的那样，即使没有任何活化预处理，HNP-NiCoO2/Ni 也实现了优异的电化学传感性能，具有高灵敏度、卓越的选择性和对 DA 测定的长期耐久性。尤其，HNP-NiCoO2/Ni 具有从 1 到 800 μM 的宽线性检测范围，在约 2.8 秒内快速响应，检测限低至 0.12 μM。此外，在 AC、葡萄糖、H2O2、Cl−、K+ 和 Na+ 存在的情况下，HNP-NiCoO2/Ni 还显示出对 DA 检测的良好抗干扰性。除了制备简单、成本低和电催化性能优异等优点外，所制备的 HNP-NiCoO2/Ni 在构建用于 DA 分析的高灵敏度电化学传感器方面具有广阔的应用前景。