-Nitrophenol (4-nitrophenol or 4-NP) is an industrial hazardous organic compound and leave an adverse effect on human beings. Due to their high toxicity rate it’s required to detect their efficiency at low cost and useful methods. To keep this view, the present study was designed and uses the cobalt oxide nanoparticles (CoONPs, ~9 nm) prepared via solution approach and characterized. The NPs were applied for the electrode preparation on to the glassy carbon electrode (GCE) via drop casted process. The modified CoONPs based GC electrode (CoONPs/GCE) was used to investigate their electrochemical sensing characteristics against 4-NP with parameters such as effect of concentration (1 to 31 μL of 4-NP/100 mL phosphate buffer solution (PBS)), effect of potential (1–100 mV/s) with fix concentration of 4-NP, effect of time response (0–1500 s), chronoamperometry etc. The reproducibility, sustainability were also tested through cycle response and a possible mechanism was also presented.

-硝基苯酚（4-硝基苯酚或4-NP）是一种工业有害有机化合物，会对人类造成不利影响。由于它们的高毒性，因此需要以低成本和有用的方法检测其效率。为了保持这种观点，本研究设计并使用了通过溶液法制备并表征的氧化钴纳米颗粒（CoONPs，〜9 nm）。通过滴铸工艺将NP用于电极制备到玻璃碳电极（GCE）上。改良的基于CoONPs的GC电极（CoONPs / GCE）用于研究其对4-NP的电化学感应特性，并具有诸如浓度影响（4-NP / 100 mL磷酸盐缓冲溶液（PBS）为1至31μL）的参数，固定浓度4-NP的电势（1–100 mV / s）的影响，时间响应的影响（0–1500 s），计时电流法等。还通过循环响应测试了可重复性，可持续性，并提出了一种可能的机制。