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Electrochemical behavior of a carbon paste elec trode (CPE) modified with nickel(Ⅱ)-5, 11, 17, 23-tetra-tertbutyl-25, 27-bis (diethylcarbamoylmethoxy) calix[4] arene ( Ni (Ⅱ)-L) complex and its electrocatalytic activity towards the oxidation of hydrogen p