The importance of hydrogen peroxide (H2O2) determination has been rapidly increasing due to its significant usage in biological and industrial applications. Hence, highly sensitive and selective sensors are required for H2O2 determination. This work demonstrates the development of highly sensitive electrochemical H2O2 sensors by using a spray exfoliated graphene and porous cobalt hexacyanoferrate nanosphere (Gr/P-CoHCF-NSPs) composite. The liquid phase high-pressure spray exfoliation technique was used to exfoliate high-quality graphene for electrochemical sensing applications. The EDTA chelation strategy was used for the homogeneous formation of P-CoHCF-NSPs on spray exfoliated graphene surfaces. The large electroactive surface area and excellent electron transfer ability of spray exfoliated graphene significantly enhanced the H2O2 sensing ability of the composite. The synthesized Gr/P-CoHCF-NSPs composite is highly reactive towards the oxidation of H2O2. The sensitivity of the fabricated sensor was 914 μA mM−1 cm−2 in a linearity range of 1 to 1000 μM. The LOD of the fabricated sensors was around 1 μM. Comparing the fabricated sensors with recently developed H2O2 sensors indicates a significant improvement in sensitivity and LOD. The interference study of the fabricated sensors revealed their highly selective nature towards H2O2 sensing. The recovery and real sample analysis of the fabricated sensors confirmed that the Gr/P-CoHCF-NSPs based H2O2 sensors are potential candidates for H2O2 detection in real samples.
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机译：由于其在生物和工业应用中的大量使用，过氧化氢（H2O2）测定的重要性已迅速增加。因此，H2O2测定需要高度敏感和选择性的传感器。这项工作证明了通过使用喷雾剥落石墨烯和多孔钴己酯纳米球（GR/P-COHCF-NSPS）复合材料的高度敏感电化学H2O2传感器的发展。液相高压喷雾去角质技术用于去角质高质量的石墨烯，用于电化学传感应用。 EDTA螯合策略用于在喷雾剥落石墨烯表面上均匀形成P-COHCF-NSP。喷雾剥落石墨烯的大型电活性表面积和出色的电子转移能力显着增强了复合材料的H2O2传感能力。合成的GR/P-COHCF-NSP复合材料对H2O2的氧化具有高度反应性。在线性范围为1至1000μm的线性范围内，制成的传感器的灵敏度为914μamm -1 cm -2。制造传感器的LOD约为1μm。将制造的传感器与最近开发的H2O2传感器进行比较，表明灵敏度和LOD有显着提高。对制造传感器的干扰研究揭示了它们对H2O2传感的高度选择性。对制造传感器的恢复和实际样品分析证实，基于GR/P-COHCF-NSP的H2O2传感器是实际样品中H2O2检测的潜在候选者。
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