Hydrotalcite quantum dot electrocatalyst, preparation method thereof, application of hydrotalcite quantum dot electrocatalyst in electrocatalytic decomposition of water to produce oxygen

Abstract

The invention discloses a hydrotalcite quantum dot electrocatalyst. The hydrotalcite quantum dot electrocatalyst adopts a chemical formula (I): [M<2+>1-xN<3+>x(OH)2]<x+>.(A<n->)x / n.mH2O (I), or a chemical formula (II): [M<2+>1-xY<4+>x(OH)2]<2x+>.(A<n->)2x / n.mH2O (II), wherein M<2+> is one or more of Ni<2+>, Zn<2+>, Mg<2+> and Ca<2+>; N<3+> is one or more of Co<3+>, Fe<3+>, Cr<3+>, Al<3+> and Mn<3+>; Y<4+> is Ti<4+>; A<n-> is NO3<-> or CO3<2->; x is larger than or equal to 0.16 and smaller than or equal to 0.50; n is the valence number of a negative ion; m is the quantity of crystal water, and is larger than or equal to 0.5 and smaller than or equal to 9; the hydrotalcite quantum dot electrocatalyst is 5 to 100 nm in size, and 0.5 to 5 nm in thickness. The invention further provides a preparation method and application of the hydrotalcite quantum dot electrocatalyst. The hydrotalcite quantum dot electrocatalyst has an obvious quantum size effect, and an excellent catalytic performance in electrocatalytic decomposition of water to produce oxygen, and is greatly lower in overpotential. The preparation method is low in cost, and simple and convenient to operate. The hydrotalcite quantum dot electrocatalyst can be applied to the fields such as photoelectrocatalysis.

Description

technical field

[0001] The invention relates to the technical field of quantum dot catalysts. More specifically, it relates to a hydrotalcite quantum dot, its preparation method and its application in electrocatalytic decomposition of water for oxygen generation. Background technique

[0002] Quantum dots (particles with a size below 100nm), because of their unique physical and chemical characteristics compared to bulk bulk materials, especially because of their quantum size confinement effect, abundant groups on the surface, high specific surface bulk ratio, and The cost is low, and it has attracted wide attention and applications in catalysis and luminescence. At present, quantum dots that have been studied more are mainly concentrated in semiconductor materials such as CdSe, CdS, and CdTe, and their applications are mainly focused on photocatalytic decomposition of water to produce hydrogen. However, due to the toxicity and other problems of quantum dots in use, their p...

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