Facile synthesis of CoxP decorated porous carbon microspheres for ultrasensitive detection of 4-nitrophenol
A novel cobalt phosphide(CoxP,a mixture of CoP and Co2P)embedded within nitrogen-doped porous carbon microspheres was facilely prepared by pyrolysis of a composite precursor.The composite precursor was achieved by in-situ growth of Co-based zeolitic imidazolate framework(ZIF-67)on the Zn(PO4)x microspheres.The asprepared CoxP decorated nitrogen-doped porous carbon microspheres(CoxP/NC)possess uniform distribution of graphite-encapsulated CoxP,a large surface area(826 m2 g-1)and abundant mesopores.It was found the CoxP/NC exhibited excellent electrocatalytic performances toward 4-nitrophenol(4-NP).Therefore,CoxP/NC was developed to fabricate an ultrasensitive electrochemical sensor for 4-NP by using differential pulse voltammetry(DPV).In comparison with glassy carbon electrode(GCE)and nitrogen-doped carbon(NC)modified GCE,the CoxP/NC modified GCE(CoxP/NC/GCE)showed a remarkable increase in DPV current toward 4-NP.Under optimized condition,an ultrahigh sensitivity of 20.9(μA μmol-1 L)and a low detection limit of 2 × 10-9 mol L-1(at a signal-to-noise ratio of 3,S/N = 3)for 4-NP were achieved.Additionally,the CoxP/NC/GCE was successfully applied to detect 4-NP in tap water with good recoveries for its attractive selectivity and repeatability,which indicated that CoxP/NC could be a promising candidate for analyzing 4-NP.
Nitrogen doped carbon Porous carbon microspheres Cobalt phosphide nanoparticles 4-nitrophenol
Lili Xiao Ruiyu Xu Fu Wang
Laboratory of Environmental Science and Technology,The Xinjiang Technical Institute of Physics and C Laboratory of Environmental Science and Technology,The Xinjiang Technical Institute of Physics and C
国内会议
四川自贡
英文
55-66
2018-05-25（万方平台首次上网日期，不代表论文的发表时间）