Ag-CoSe2 nanoribbon and preparation method and purpose thereof

Abstract

The invention discloses an Ag-CoSe2 nanoribbon and a preparation method and a purpose thereof. The Ag-CoSe2 nanoribbon is complete in structure and excellent in electric conductivity; when the overpotential is 0.35 V, the current density is increased by 8 times compared with pure CoSe2 nanocatalyst; when the current density is 10 mA / cm2, the overpotential is only 0.32 V, and is reduced by 73 mV compared with the pure CoSe2 nanocatalyst; and in addition, the Ag-CoSe2 nanoribbon can directly serve as a catalyst for the electrolysed water oxygen evolution reaction process, shows excellent catalysis activity in the catalysis reaction process, and achieves more advantages. The preparation method of the Ag-CoSe2 nanoribbon uses a micro ion exchange method; compared with a traditional nanometer crystal synthesis method, the preparation method of the Ag-CoSe2 nanoribbon is simple and fast in reaction, mild in conditions, short in operation time and simple in procedures, largely reduces the synthesis cost, and is more environment-friendly in synthesis process; and the obtained nanoribbon is uniform in size and excellent in dispersibility, so that the catalysis activity of the electrolysed water oxygen evolution reaction is improved, and the application prospect is broad.

Description

technical field [0001] The invention belongs to the technical fields related to the synthesis of two-dimensional nanomaterials, energy and catalysis, and in particular relates to an Ag-CoSe 2 Nanobelts and methods for their preparation and use. Background technique [0002] Facing the current situation of dwindling traditional energy resources, energy issues have attracted more and more attention. As a new type of clean energy, hydrogen energy has huge room for development in the field of new energy. Electrolyzed water is an important industrial form of hydrogen source at present, but its reaction process is limited by the high reaction barrier of the anode oxygen evolution reaction of electrolyzed water. In order to reduce the reaction barrier of this reaction, various catalyst materials are widely used in the process of oxygen evolution reaction in order to speed up the reaction rate. However, as currently the most efficient oxygen evolution reaction catalysts, iridium ...

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Problems solved by technology

For example, "ACS Nano" (ACS Nano 8.3970-3978, 2014) reported a method for growing two-dimensional cobalt diselenide nanobelts on the surface of two-dimensional graphene to improve the conductivity of the catalyst and thereby improve the catalytic activity, but in the catalytic process, Carbon materials are extremely susceptible to being etched by oxygen atoms from hydroelectrolysis, which is not conducive to the stable existence of the catalyst structure, and the preparation of few-layer graphene also requires a series of complicated and time-consuming processes, which increases the time cost of the experiment.

"German Applied Chemistry" (Angewandte Chemie International Edition 55.5733-5738, 2016) reported that two-dimensional Cu 2 WS 4 The method of nanosheet conductivity, although the self-conductivity of the two-dimensional material has been significantly improved due to the hydrogen produced by the hydrolysis of interlayer lithium ions, however, the time cost for the interlayer process of lithium ions inserted into the two-dimensional material is very high (24h ), and the use of lithium-containing additives and the reaction conditions of long-term ultrasound (3h) in ice bath make the reaction cost very high, which is not conducive to large-scale preparation

[0006] So far, no literature has reported the simple and rapid preparation of two-dimensional CoSe with complete structure, good electrical conductivity and excellent catalytic activity under aqueous conditions. 2 Nanoribbon Structured Approach

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