亚硝酸盐对环境和人体健康有着不利的影响，人体长期食用含大量亚硝酸盐的食物有致癌的风险，对亚硝酸盐的分析和检测是非常重要的. 开发高效的电催化剂，从而实现高灵敏度和高选择性的亚硝酸盐检测具有十分重要的意义. 作者通过先水热再低温磷化获得了磷化钴纳米阵列（CoP/TM）.电化学测试结果表明，所构建的CoP/TM电极对亚硝酸盐的还原具有高效的催化作用，线性检测范围为1.0 μmol·L^-1到1.0 mmol·L^-1，检测下限为18 nmol·L^-1（S/N=3），响应灵敏度为17781 μA·(mmol·L^-1)^-1·cm^-2，响应时间小于3 s，选择性良好.

Nitrite has a negative impact on the environment and human health. The long-term consumption of nitrite-containing foods has a carcinogenic risk. Therefore, the analysis and detection of nitrite are important. It is of great significance to develop high-efficiency electrocatalysts to achieve high sensitivity and selectivity for nitrite detection. The cobalt phosphide nano-array (CoP/TM) was obtained by hydrothermal and low-temperature phosphating. The electrochemical test results show that the constructed CoP/TM was a highly efficient electrochemical reduction nitrite catalyst with the excellent sensing performance and response time less than 3 s, as well as the linear detection range of 1.0 μmol·L^-1 to 1.0 mmol·L^-1 and lower detection limit of 18 nmol·L^-1 (S/N = 3). The response sensitivity was 17718 μA·(mmol·L^-1)-1·cm^-2 with the satisfactory selectivity.