Catalytic material of Co / Mo modified metal foam nickel and application of catalytic material in electrolytic hydrogen production
By electrodepositing a Co-Mo alloy catalytic layer on a three-dimensional nickel foam substrate, the conductivity and preparation complexity problems of Co-Mo catalysts were solved, and efficient and low-cost OER electrode preparation was achieved, which is suitable for large-area applications.
Patent Information
- Application Number
- CN202511215772.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-28
- Publication Date
- 2025-10-10
AI Technical Summary
Existing Co-Mo-based catalysts have conductivity and mass transfer problems in powder form, and the preparation process is complex, making it difficult to achieve large-scale, low-cost continuous production.
Three-dimensional porous nickel foam is used as the electrode substrate, and a Co-Mo alloy catalyst layer is directly grown through electrodeposition technology, which simplifies the preparation process and improves the integration of the catalyst and the electrode.
An efficient and stable Co-Mo alloy OER electrode was achieved, which reduced the preparation cost and improved the catalytic performance, making it suitable for large-area applications.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of electrochemical energy conversion, and particularly relates to a preparation method of a high-efficiency oxygen evolution reaction (OER) electrode, in particular, a method for constructing a cobalt-molybdenum (Co-Mo) alloy catalytic layer on a three-dimensional nickel foam substrate through electrodeposition technology and application thereof. BACKGROUND
[0002] With the continuous growth of global energy demand and the increasing urgency of environmental protection, developing clean and sustainable alternative energy has become a major strategic demand in today's world. Hydrogen energy, with its high energy density and non-polluting combustion products, is considered one of the most promising future energy carriers. Among various hydrogen production technologies, water electrolysis is an important way to achieve large-scale green hydrogen production due to its clean process and high product purity.
[0003] However, the water electrolysis process includes two key half-reactions: the hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the anode. Among them, OER is a complex process involving four-electron transfer, with slow kinetics and high overpotential, which becomes a bottleneck restricting the overall water electrolysis efficiency. In order to reduce the reaction energy barrier and improve energy conversion efficiency, high-efficiency electrocatalysts must be used.
[0004] Currently, the best OER catalysts are based on noble metal oxides such as IrO2 and RuO2. However, these noble metal catalysts are severely limited in large-scale industrial applications due to their scarcity, high cost, and lack of long-term stability. Therefore, developing efficient, stable, and low-cost non-noble metal OER catalysts has become a research focus and urgent need in this field.
[0005] Among the many non-noble metal candidate materials, transition metal-based catalysts such as oxides and hydroxides of Ni, Co, Fe, and Mo, and their alloys are favored due to their wide availability, low cost, and comparable catalytic activity to noble metals. Among them, cobalt (Co)-based materials show good intrinsic OER activity, and the introduction of molybdenum (Mo) has been proven to effectively regulate the electronic structure of cobalt, optimizing its adsorption energy for oxygen intermediates, thereby significantly enhancing its catalytic performance. The cobalt-molybdenum (Co-Mo) alloy system, especially its in-situ generated hydroxyl oxide, has been reported to have excellent OER activity and stability. SUMMARY
[0006] The technical problems solved by the present application are:
[0007] Although Co-Mo-based catalysts have shown great potential in powder form, their practical application still faces a series of severe challenges:
[0008] 1. Conductivity and mass transfer issues: Most catalytically active phases (such as metal oxides / hydroxides) have poor intrinsic conductivity. Coating powdered catalysts onto electrode surfaces with polymer binders (such as Nafion) introduces additional contact resistance and blocks active sites, severely restricting charge transfer and electrolyte diffusion, resulting in actual performance far below theoretical values.
[0009] 2. Complexity of preparation process: The preparation methods of many high-performance catalysts involve complex processes such as high-temperature hydrothermal and calcination, which have high energy consumption and cumbersome processes, making it difficult to achieve large-scale, low-cost continuous production.
[0010] Therefore, there is an urgent need to develop an integrated electrode preparation technology that can firmly and efficiently integrate highly active Co-Mo catalysts with electrode substrates to directly solve the above-mentioned conductivity, stability and preparation cost problems.
[0011] The technical solution adopted in the present invention is:
[0012] To address the aforementioned deficiencies in the prior art, the present invention aims to provide an integrated Co-Mo alloy OER electrode and its preparation method, characterized by a simple preparation process, low cost, excellent catalytic performance, and high stability. The present invention utilizes a three-dimensional porous nickel foam (NF) as the electrode substrate, upon which a Co-Mo alloy catalyst layer is grown directly by electrodeposition. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is the oxygen evolution reaction (OER) CV test result diagram of Co / Mo@Ni foam; DETAILED DESCRIPTION
[0014] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the technical solutions in the embodiments are described in detail below. If specific conditions are not particularly specified, the operation will be carried out according to the usual conditions or the manufacturer's recommendations. When the manufacturer of a reagent or instrument is not particularly specified, it refers to a conventional product that can be purchased on the market.
[0015] Example
[0016] A Co / Mo-modified Ni foam self-supporting catalytic material is prepared by the following steps: first, using NF as the anode in a 0.2 mol / L cobalt nitrate solution, performing CV cycles within a voltage window of -1 to -2 V at a controlled scan rate of 100 mV / s. Subsequently, using the Co-modified NF as the anode in a 0.01 mol / L molybdenum phosphate solution, performing CV cycles within a voltage window of 1 to 2 V at a controlled scan rate of 100 mV / s. After washing and drying, the final sample is labeled Co / Mo@Cu foam.
[0017] Test example
[0018] 1.CV test
[0019] The catalytic materials of the examples were tested for OER performance. The test conditions were as follows: In the OER test, a standard three-electrode system was used, with the self-supporting material as the anode, mercury / mercuric oxide (Hg / HgO) as the reference electrode, and a platinum sheet as the cathode. A Wuhan Corrtest Studio 6 electrochemical workstation was used, and the voltage window was set to 0-1 V (vs. Hg / HgO).
[0020] Figure 1 The oxygen evolution reaction (OER) CV polarization curve of Co / Mo@Ni foam shows that the material has excellent OER performance after hydrothermal treatment. -2 The overpotential is 364mV at the current density.
[0021] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.
Claims
1. A cobalt / molybdenum modified commercial metal foam nickel material was obtained by a step-by-step electrodeposition strategy, characterized in that: First, CV cycles were performed in a cobalt nitrate solution with NF as the anode. Then, CV cycles were performed in a molybdenum phosphate solution with cobalt-modified NF as the anode. Specifically: (1) The concentration of cobalt nitrate solution was 0.2 mol / L, the CV was controlled at a scan rate of 100 mV / s, and 10 cycles were performed within the voltage window of -1 to -2 V. (2) The concentration of the phosphomolybdic acid solution was 0.01 mol / L, the CV was controlled at a scan rate of 100 mV / s, and 10 cycles were performed within a voltage window of 1 to 2 V.
2. Application of the cobalt / molybdenum modified commercial metal foam nickel material according to claim 1 as an anode material in hydrogen production by electrolysis of water.