By constructing bimetallic active sites,NiCoSe2 nanospheres can improve the interfacial charge transfer rate,synergistically enhancing the intrinsic activity of the active sites,and promoting the im-provement of the electrocatalytic performance.The sensitivity in the detection of As (Ⅲ)can reach 0.34μA/ppb.There are Ni(Ⅱ)/Ni(Ⅲ)and Co(Ⅱ)/Co(Ⅲ)cycles in the reaction system.Fenton reac-tion accelerates the electron transfer rate and improves the electrochemical detection signal.Compared with the single metal system,the introduction of the second metal can activate the original metal active sites.Compared with oxides and sulfides,selenides have stronger metallicity,good conductivity,repro-ducibility and stability,with stable detection of As (Ⅲ)in real water samples achieved.These results show that NiCoSe2 as an electrode modification material for detection of As(Ⅲ)has potential applica-tions in the field of electrochemistry.
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