Electrospining Machine: Synthesis of CoMoO4 nanofibers as efficient electrocatalysts for overall water separation using electrospinning technology

Background

Addressing climate change and reducing carbon emissions is conducive to promoting the green transformation of the economic structure, accelerating the production and development of green energy, mitigating the adverse impacts of climate change and reducing economic and social losses. As the basis of hydrogen energy, electrocatalytic hydrolysis involving its production and utilization has naturally become a focus of attention. For cathodic hydrogen precipitation reactions, noteworthy materials (e.g., pt-based) catalysts have been proven to have excellent performance. On the other hand, the great potential created by OER influences the production capacity. Noble metal-based materials (Ru/IrO2) still exhibit the highest catalytic activity for oxygen generation. However, the water decomposition is hindered by the huge consumption of important raw materials. Transition metal compounds (TMCs) have been extensively studied as bifunctional electrocatalysts due to their abundance and excellent performance.

The main point of this paper

Methods for the modification of CoMoO4 catalysts:

CoMoO4 electrocatalysts with small size structures can be prepared by a simple hydrothermal reaction and post-processing step, thus exposing more active sites and increasing catalytic activity

Electrochemical properties of CoMoO4:

CoMoO4 catalysts show excellent electrochemical activity in the field of electrocatalytic water decomposition for hydrogen and oxygen production, with abundant valence and easily modulated electronic structure

Synthesis of CoMoO4 nanofibers:

CoMoO4 nanofibers were synthesized by electrostatic spinning and post-processing, which can control the morphology and structure of the material and improve the efficiency of water splitting

Stability of CoMoO4 catalyst:

The CMO-650 catalyst showed stable performance in prolonged electrochemical tests, showing a low overpotential of 80 mV in HER and a current density of 10 mA cm-2.

Application prospects of CoMoO4 catalysts:

CoMoO4 is considered as a cost-effective strategy for synthesizing catalysts with remarkable desirable properties such as non-toxicity, low cost, and good electrochemical activity, and has been applied in a number of applications

CoMoO4 Electrospun Nanofbers: an efficient bimetallic oxide catalyst for electrochemical water splitting applications

Energy transition and the importance of hydrogen energy:

In order to improve traditional energy production and resource consumption, it is crucial to develop clean and green assembly lines, of which hydrogen energy is considered to be one of the most desirable options

Synthesis and Properties of CoMoO4 Electrospun Nanofbers:

CoMoO4 nanofibers were synthesized by electrostatic spinning and post-heat treatment at different temperatures, and these Electrospun Nanofbers showed excellent activity in the hydrogen evolution reaction (HER), requiring only 80 mV overpotential to achieve a current density of 10 mA cm-2

Application of CoMoO4 in oxygen evolution reaction (OER):

CoMoO4 catalysts also performed well in OER in 1 M KOH, although OER is a more complex process that requires additional energy to initiate

Stability of CoMoO4 Electrospun Nanofibers:

CoMoO4 Electrospun Nanofbers showed excellent stability over multiple CV cycles and maintained catalytic activity for up to 80 hours in timer tests

Synergistic effect of bimetallic oxides:

The excellent performance of CoMoO4 Electrospun Nanofbers is attributed to the synergistic interaction between the different metal elements, which makes CoMoO4 active beyond a single oxide

Prospects for the application of bimetallic oxides in energy production:

This work demonstrates the promising prospects of bimetallic oxides for water decomposition, which is important for energy production

Summarize

In summary, we constructed different nanofibers by selective calcination in air using electrospinning mats as precursors. The results show that CMO-650 has good activity and stability at a current density of 10 mA cm-2. In addition, we found that CMO-650 has good electrochemical performance in OER test because its one-dimensional structure can effectively bind electrolyte for fast mass transfer.The long OER test at 50 mA cm-2 lasted for 80 h. The electrochemical tests of the different oxides all confirmed its unique fiber structure and bimetallic synergistic effect superior to that of HER and OER.According to XRD, after the HER reaction, the surface of the material remains almost unchanged, but the water-oxidized material presents a new substance, which is the active substance that really provides the activity. The present work establishes a tractable strategy to provide one-dimensional cmos -650 materials for bifunctional electrochemical catalysis.