《Table S3 LSV test parameters》

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《碳纳米管载钴基纳米材料的制备:一种优异的电催化析氢活性材料(英文)》

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In order to characterize the electrochemical properties，Linear-sw eep voltammetry（LSV）test w as conducted on CoNiP/NCNTs samples w ith different phosphorus contents after CV scanning w as stabilized in the 0.5 mol/L（p H=0.2）sulfuric acid solution.Pt/C（10 w t.%Pt/XC-72），CoNiO2/NCNTs precursor and NCNTs w ere conducted as contrast.Fig.5a show s that CoNiP/NCNTs-2 has the best HER performance and the low est Tafel slope at10 mA cm-2，but its properties are still not as good as Pt/C.The metal oxides in CoNiP/NCNTs-1 show a deterioration of HER performance in the acidic electrolyte.How ever，due to the phosphates generated by excessive phosphorus in CoNiP/NCNTs-3，and the high electronegativity of P and O（2.14 and 3.44，respectively），they have a strong binding force on free electrons，w hich hinders the movement of free electrons and leads to a decrease in the electrical conductivity w ith low HER performance.Detailed data and comparison w ith other catalysts under the same conditions are show n in Table S1 and Table S2.In order to explain the HER performance of the catalyst materials essentially，w e estimate the amount of active sites at the same time，and the specific values are show n in Table S3.According to Faraday’s formula Q=2n F（F=964 85C/mol）and the total amount of charge transferred during the test，w e can estimate the active sites on the material surface，the calculating results n1=2.18×10-7，n2=7.31×10-7，n3=2.54×10-7mol for CoNiP/NCNTs-q，CoNiP/NCNTs-2 and CoNiP/NCNTs-3，respectively.It can be seen that during the same test time，the amount of active sites exposed from CoNiP/NCNTs-2 is highest among the three samples，indicating the best catalytic activity.