In this study, Co, Ni and N were introduced into the carbon-based materials to construct the Co/Ni/N/MPC(microwave pyrolysis biochar) sensor with multiple electrochemical active signal sites. Under the performance of microwave-assisted synthesis, carbon-based skeleton was employed to uniformly disperse Co and Ni atoms, forming metal-metal bonds with stronger activity than single metal. Nitrogen doping could also stabilize the carbon-based skeleton and promote electron transfer efficiency. To investigate the influence of different metal ratios on catalytic performance, the sensitivity of the three sensor configurations (Co/Ni/N/MPC/GCE, Co/Ni/N/MPC/GCE and Co/Ni/N/MPC/GCE) for the detection of hydrogen peroxide (HO) was examined. The collected results showed that Co/Ni/N/MPC/GCE had the highest sensitivity, and the linear equation was fitted by the change of current signal I and HO concentration. The linear range was 0.05–272.15 mM, and the detection limit was 0.56 μM (S/N = 3), which was applied in the actual sample detection. We achieved recovery rates of 98.3–98.9% and relative standard deviations (RSD) of 2.6–4.2% for the detection of HO in tap water samples. In this study, bimetallic elements as well as nitrogen doping were employed to enhance both the activity and stability of the material, consequently expanding the sensitivity of the material, in the meanwhile achieved highly sensitive detection of HO in water.

中文翻译：

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甘蔗渣Co/Ni/N/MPC纳米复合材料的制备及其在H2O2检测中的应用

本研究将Co、Ni和N引入到碳基材料中，构建了具有多个电化学活性信号位点的Co/Ni/N/MPC（微波热解生物炭）传感器。在微波辅助合成的性能下，采用碳基骨架均匀分散Co和Ni原子，形成比单一金属活性更强的金属-金属键。氮掺杂还可以稳定碳基骨架并提高电子转移效率。为了研究不同金属比例对催化性能的影响，三种传感器配置（Co/Ni/N/MPC/GCE、Co/Ni/N/MPC/GCE 和 Co/Ni/N/MPC/GCE）的灵敏度对过氧化氢（H2O）的检测进行了检查。收集的结果表明Co/Ni/N/MPC/GCE的灵敏度最高，并且通过电流信号I和H2O浓度的变化拟合线性方程。线性范围为0.05~272.15 mM，检测限为0.56 μM（S/N = 3），应用于实际样品检测。我们在自来水样品中检测 H2O 时实现了 98.3-98.9% 的回收率和 2.6-4.2% 的相对标准偏差 (RSD)。本研究采用双金属元素以及氮掺杂来增强材料的活性和稳定性，从而扩大了材料的灵敏度，同时实现了水中H2O的高灵敏检测。