Nickel cobalt oxyhydroxide-doped graphene oxide used as oxygen evolution catalysis material

Abstract

The invention discloses a nickel cobalt oxyhydroxide-doped graphene oxide composite catalyst, and preparation and application thereof. The transition metal oxyhydroxide-doped graphene oxide compositecatalyst comprises graphene oxide and Ni<x>Co<1-x>OOH, wherein x is in a range of 0.5 to 0.9. The Ni-Co transition metal oxyhydroxide-doped graphene oxide shows superior oxidizability, photoelectrochemical properties and electrocatalytic activity due to its special structure, high specific surface area and high activity.

Description

technical field [0001] The invention belongs to the field of functional catalysts and their preparation and application, in particular to an oxygen evolution catalytic material of transition metal nickel cobalt oxyhydroxide doped graphene oxide and its preparation and application. Background technique [0002] Renewable energy sources such as wind energy, solar energy, and tidal energy have advantages different from traditional energy sources, such as wide distribution, large energy, zero emissions, and environmental friendliness. They are called "inexhaustible and inexhaustible" energy sources , are increasingly favored by researchers. But there are also fatal shortcomings, such as intermittent energy, difficult storage and transportation. The electrolysis of water hydrogen production technology driven by the above-mentioned renewable energy can convert it into clean and efficient hydrogen energy, which effectively avoids the intermittent, difficult storage and transportat...

AI Technical Summary

Problems solved by technology

At present, the methods for preparing transition metal / carbon nanocomposites mainly include: (1) arc discharge method. Jiang et al. prepared NiCo by arc discharge method. 0.16 Fe 0.34 -CNTs nanocomposite material, this method has strict requirements on the instrument, and H is used in the preparation process 2 , the operation is more dangerous; (2) chemical vapor deposition method, Ma Lei et al. used fluidized bed vapor deposition method on TiO 2 / Fe-Ni in situ deposition of CNTs to obtain CNTs / TiO 2 / Fe-Ni composite photocatalyst, this method has strict requirements on equipment, high production cost, and it is difficult to prepare N-doped transition metal / carbon composite materials; (3) impregnation-reduction method, Qiao et al. Ni-NG (N-doped graphene) composite nanomaterials were prepared in one step. The preparation process of this method is relatively cumbersome. It is necessary to oxidize graphite to prepare graphite oxide, then reduce hydrazine to prepare NG, then impregnate Ni2+, and finally reduce to obtain Ni-NG, and Ni in the Ni-NG prepared by this method cannot be uniformly dispersed on the NG; (4) High-temperature solid phase decomposition method, which is simple and easy to operate and has good safety performance. Methods

Liu et al. mixed 1,10-phenanthroline iron with ZIFs series metal-organic framework materials, and prepared Fe-NC nanocomposites by one-step high-temperature solid-state decomposition method, but the ligands of ZIFs series metal-organic framework materials are expensive. The synthesis process is complicated

[0005] However, the inventive method of preparing transition metal oxyhydroxide-doped graphene oxide oxygen evolution catalytic materials by hydrothermal synthesis using cheap and easy-to-obtain nickel salts, cobalt salts and carbon sources has not been reported yet.

Images