A selective electrode for oxygen reduction reaction (ORR) and electrocatalytic reduction of 4-nitrophenol (p-NP) was fabricated on a glassy carbon electrode using organic–inorganic Bi₂MoO₆/H₂TPP nanocomposites with different weight percentages of tetraphenylporphyrin, synthesized by the solvothermal process. Materials thus synthesized were characterized through UV–Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) analysis. The electrocatalytic performance of the modified electrode toward ORR in the 0.1 M KOH solution, the onset potential E_onset (0.942 V), E_1/2 (0.704 V) vs RHE, J_d (−5.545 mA cm^–2), and n = 4 physicochemical parameters were well appreciable. It exhibits good catalytic activity toward ORR through a four-electron pathway with excellent stability and high active site density, and thus, the in situ Porphy-decorated metal oxide system facilitates the electron transport process. High selectivity and efficacy for the oxygen reduction reaction (ORR) are a significant measure for several energy-converting applications. The decorated electrode, glassy carbon electrode (GCE)/Bi₂MoO₆/3 wt % Porphy, serves as an electrochemical sensor that exhibited good sensitivity (0.4683 μAμM^–1 cm^–2), good reproducibility, a low detection limit (0.0940 μM), and long-term stability in the aqueous phase without any appreciable effect in the presence of some common organic and inorganic interferences for the detection of p-NP in a linear concentration range of 0.5–350 μM. Therefore, the material performs as an effective electrode for both the ORR and the electrocatalytic reduction of p-NP with real matrix samples at room conditions.

中文翻译：

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四苯基卟啉修饰的 Bi2MoO6 纳米复合材料：氧还原反应和 4-硝基苯酚电化学检测的双重亲和力

_{使用有机-无机 Bi 2} MoO ₆ /H ₂在玻碳电极上制备了用于氧还原反应 (ORR) 和 4-硝基苯酚 ( p -NP) 电催化还原的选择性电极通过溶剂热法合成的具有不同重量百分比的四苯基卟啉的 TPP 纳米复合材料。通过紫外-可见漫反射光谱、X 射线光电子能谱 (XPS)、场发射扫描电子显微镜 (FE-SEM)、能量色散 X 射线光谱 (EDX)、高分辨率透射电子显微镜对由此合成的材料进行表征(HR-TEM)、傅里叶变换红外光谱 (FT-IR) 和 X 射线衍射 (XRD) 分析。修饰电极在 0.1 M KOH 溶液中对 ORR 的电催化性能、起始电位E _onset (0.942 V)、E _1/2 (0.704 V) vs RHE、J _d (-5.545 mA cm ^–2 ) 和n= 4 物理化学参数非常可观。它通过四电子途径对 ORR 表现出良好的催化活性，具有优异的稳定性和高活性位点密度，因此，原位 Porphy 修饰的金属氧化物体系促进了电子传输过程。氧还原反应 (ORR) 的高选择性和高效性是几种能量转换应用的重要衡量标准。装饰电极，玻碳电极 (GCE)/Bi ₂ MoO ₆ /3 wt % Porphy，用作电化学传感器，表现出良好的灵敏度 (0.4683 μAμM ^–1 cm ^–2)、良好的重现性、低检测限 (0.0940 μM) 和在水相中的长期稳定性，在一些常见的有机和无机干扰的存在下对检测线性浓度范围内的p -NP 没有任何明显影响0.5–350 微米。因此，该材料可作为 ORR 和在室温条件下用真实基质样品电催化还原p -NP 的有效电极。