Method for preparing cobalt-based nanosheet self-supporting electrode from selenium-containing ligand and application of cobalt-based nanosheet self-supporting electrode

Abstract

The invention discloses a method for preparing a cobalt-based nanosheet self-supporting electrode from a selenium-containing ligand and application of the cobalt-based nanosheet self-supporting electrode in the field of energy catalysis. A selenium-containing porous coordination polymer is directly grown on carbon cloth for the first time through a solvothermal method, and a selenium-doped cobalt phosphide two-dimensional ultrathin nanosheet (Se-CoP) self-supporting electrode with the thickness of about 4 nm is obtained through low-temperature phosphorization in an inert atmosphere. According to the prepared cobalt-based nanosheet self-supporting electrode, the hydrogen production large current density of 500 mA.cm <-2 > and the oxygen production large current density of 1000 mA.cm <-2 > can be respectively achieved only through overpotentials of 117 mV and 126 mV, and the oxygen production large current density of 500 mA.cm <-2 > and the oxygen production large current density of 1000 mA.cm <-2 > can be respectively achieved only through overpotentials of 347 mV and 360 mV. So far, the Se-CoP self-supporting electrode is one of the best alkaline HER catalysts at industrial current densities of 500 and 1000 mA * cm <-2 > in 1 M of KOH. The preparation cost of the cobalt-based nanosheet self-supporting electrode is low, and the cobalt-based nanosheet self-supporting electrode has potential industrial application value in the field of energy catalysis and can be used for electro-catalytic water decomposition and various organic catalytic reactions.

Description

technical field [0001] The invention relates to the preparation of nanosheet self-supporting electrodes and the field of energy catalysis, in particular to the synthesis of cobalt-based nanosheet self-supporting electrodes prepared by ligands containing selenium and their application as electrocatalytic water splitting catalysts. Background technique [0002] In recent years, affected by problems such as the traditional energy crisis and environmental pollution, hydrogen energy has attracted widespread attention as a sustainable and environmentally friendly new energy source. Electrocatalytic total water splitting can produce high-quality hydrogen without carbon emissions, providing a very promising and efficient method for hydrogen production. Electrocatalytic water splitting consists of two half-reactions, namely oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). However, the main reason hindering the practical application of electrocatalysts is the sl...

AI Technical Summary

Problems solved by technology

At present, although some self-supporting electrodes have been reported for electrocatalytic total water splitting, most of them are thick nanosheets or nanoparticles with large size, and the catalytic activity is not ideal.

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