Self-Derivative Iron-Nickel Anode for Alkaline Water Electrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional water electrolysis anodes made of nickel-based materials suffer from low oxygen-evolution electrocatalytic activity due to the slow kinetics of oxygen evolution, which limits the efficiency of hydrogen production and results in high cell voltage, and the catalyst layer detachment during long-term use.
Innovation Solution
A self-derivative iron-containing nickel anode with an integrally formed catalytic layer, where a nickel substrate is oxidized to form a nickel-oxide nanosheet array and then electrochemically corroded with iron ions to create an iron-containing nickel-oxide nanosheet array, enhancing oxygen-evolution activity and mechanical adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional nickel-based anodes are used, then the structure is simple and easy to manufacture, but the oxygen-evolution electrocatalytic activity is low due to slow kinetics
Solution Approach 1:
The patent changes the chemical composition parameters of the anode by incorporating iron into the nickel oxide lattice, forming nickel-iron composite compounds. This compositional parameter change transforms the low-activity nickel oxide surface into high-activity nickel-iron composite compounds, thereby improving oxygen-evolution electrocatalytic activity and reducing cell voltage.
Solution Approach 2:
The patent creates composite materials by combining nickel and iron to form nickel-iron composite compounds (nickel iron oxide, nickel iron hydroxide, nickel iron phosphide, etc.). These composite materials exhibit synergistic effects that enhance the oxygen-evolution electrocatalytic performance beyond what pure nickel or iron could achieve alone.
2Reliability
If traditional preparation methods are used to create catalyst layer, then the coating process is simple, but the catalytic layer detaches during long-term use
Solution Approach 1:
The patent merges the substrate and catalytic layer into an integrally formed structure where the catalytic layer is grown in-situ on the nickel substrate. This merging eliminates the distinct phase interface between substrate and catalytic layer, creating strong chemical bonds that prevent detachment during long-term use, thereby improving reliability and extending lifetime.
Solution Approach 2:
The patent uses an intermediary oxidation process where the nickel substrate is first oxidized to form nickel oxide nanosheet array, which then serves as the base for iron incorporation. This intermediary nickel oxide layer acts as a bridge between the metallic nickel substrate and the final nickel-iron composite catalytic layer, ensuring strong adhesion and preventing detachment.
3Productivity
If nickel substrate is oxidized to form nickel oxide layer, then the catalytic activity improves, but the layer becomes prone to detachment
Solution Approach 1:
The patent strengthens the nickel oxide layer by incorporating iron to form nickel-iron composite compounds. This composite material approach enhances both the oxygen-evolution activity and the mechanical strength of the layer, preventing detachment while maintaining high catalytic performance.
Solution Approach 2:
The patent applies local quality enhancement by selectively incorporating iron into specific regions of the nickel oxide nanosheet array. The iron incorporation is not uniform throughout the bulk material but is localized at the catalytic surface where it provides both enhanced oxygen-evolution activity and improved mechanical adhesion through strong Fe-O-Ni bonding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The iron-containing nickel anode reduces cell voltage, improves catalytic performance, and increases the physical stability of the electrode, leading to enhanced oxygen-evolution efficiency and reduced energy consumption in water electrolysis.
Implementation Method 1
The cleaned nickel substrate is exposed, at a constant temperature, in an oxidant-rich alkaline solution to obtain, at a surface of the substrate, a self-derived nickel-oxide nanosheet array layer
Implementation Method 2
The substrate with nickel-oxide nanosheet array layer is electrochemically induced iron ion to corrode the nickel-oxide nanosheet array layer to obtain an iron-containing nickel-oxide nanosheet array on the surface of the substrate
Implementation Method 3
Water electrolysis involves hydrogen evolution at a cathode coupled with oxygen evolution at an associated anode
Data Source
AI summary
The invention discloses a self-derivative iron-containing nickel anode for alkaline water electrolysis and its preparation method. The anode comprises a nickel substrate and catalytic material layer. The catalytic layer is disposed on and integrated with the surface of the nickel substrate. The catalytic layer contains nickel oxide with iron components. The nickel oxide results from the reaction of the surface layer of the nickel substrate with an oxidant-rich alkaline solution and forms a nanosheet array layer. A nickel-oxidation state containing the iron component is formed by electrochemically induced iron-ion corrosion of the nickel-oxidation state. The invention can effectively reduce the potential difference between the anode and cathode of an electrolysis cell, thereby significantly reduces energy consumption and improves the efficiency of water electrolysis.