Compared with extensively-used chemically-exfoliated graphene, physically-exfoliated graphene-based heterogeneous structures are rarely used for electrochemical analysis. In this work, physically-exfoliated graphene nanosheets (GN) are used as the substrate material to couple high-activity FeOOH nanoparticles. Multiple characterization technology confirm that a novel hierarchical hybrid composed of physically-exfoliated graphene nanosheets and FeOOH nanoparticles (GN@FeOOH) is easily obtained by a facile solution growth strategy. Plenty of fiber-like FeOOH nanoparticles with size about 20 nm are uniformly anchored on the surface of graphene with robust adhesion. Relative to pristine GN, the electrochemical active area and electron transfer kinetics are greatly boosted for the introduction of high-activity of FeOOH nanoparticles. Benefiting from the remarkably enhanced electrochemical activity, the obtained GN@FeOOH hybrids exhibit excellent electrochemical performance toward the reduction of H₂O₂. As a result, a novel and rapid electrochemical sensing platform for the detection of H₂O₂ at low applied potential (-0.25 V vs. SCE) is fabricated with wide linear range (0.25 μM - 1.2 mM) and high sensitivity (265.7 μA mM⁻¹ cm^-2), and the limit of detection is as low as 0.08 μM, which is comparable with many other noble metal-based electrochemical sensors and exceeds many non-noble metal-based electrochemical sensors.

与广泛使用的化学剥落石墨烯相比，基于物理剥落石墨烯的异质结构很少用于电化学分析。在这项工作中，物理剥离的石墨烯纳米片（GN）被用作耦合高活性FeOOH纳米粒子的基质材料。多种表征技术证实，通过简便的溶液生长策略可以轻松获得由物理剥离的石墨烯纳米片和FeOOH纳米颗粒（GN @ FeOOH）组成的新型分层混合体。大量具有约20 nm尺寸的纤维状FeOOH纳米颗粒均匀地锚定在石墨烯表面上，具有牢固的附着力。相对于原始GN，由于引入了高活性的FeOOH纳米颗粒，电化学活性面积和电子转移动力学得到了极大的提高。₂ O ₂。结果，以宽的线性范围（0.25μM-1.2 mM）和高灵敏度（265.7μA）制造了新颖且快速的电化学传感平台，用于在低施加电势（-0.25 V vs. SCE）下检测H ₂ O ₂。 mM ^-1  cm ^-2），检测限低至0.08μM，与许多其他基于贵金属的电化学传感器相当，并且超过了许多基于非贵金属的电化学传感器。