In-Situ Anode Activation via Cathode Catalytic Transfer
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Solution Overview
Problem
The existing methods for alkaline water electrolysis require separate ex-situ activation of anodes, which increases production costs and time, and do not allow for continuous activation during the electrolysis process.
Innovation Solution
In-situ anode activation is achieved by using a cathode with an anode catalytic material that releases and deposits onto the anode within the electrolytic cell during electrolysis, reducing anodic overpotential and maintaining the anode in an activated state through continuous replenishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate ex-situ activation of anodes is performed before installation in the electrolytic cell, then the anode surface is activated with catalytic material, but production cost and activation time increase
Solution Approach 1:
The cathode is pre-loaded with anode catalytic material (such as nickel sulfide or Raney nickel) during manufacturing. This preliminary preparation allows the catalytic material to be transferred to the anode during normal operation, eliminating the need for separate pre-activation steps and reducing production time while ensuring reliable anode activation.
Solution Approach 2:
The system uses the cathode itself as a source of catalytic material for anode activation. During electrolysis, the catalytic material automatically transfers from the cathode to the anode surface through electrochemical reactions, enabling the anode to self-activate without external intervention or separate activation equipment.
2Reliability
If separate ex-situ activation of anodes is performed before installation in the electrolytic cell, then the anode surface is activated with catalytic material, but production cost increases
Solution Approach 1:
The invention combines the cathode and anode activation functions into a single system. The cathode is designed to contain and release anode catalytic material, merging the activation function into the cathode structure itself. This eliminates the need for separate activation equipment and processes, reducing manufacturing costs while ensuring reliable anode activation.
Solution Approach 2:
The cathode serves multiple functions: it performs its primary electrolysis function and simultaneously acts as a reservoir and source of catalytic material for anode activation. This multi-functionality reduces the need for separate activation systems and materials, thereby reducing production costs while maintaining reliable anode activation.
3Reliability
If anodes are activated before installation, then the anode is ready for electrolysis, but the activation cannot be maintained or replenished during operation
Solution Approach 1:
The cathode continuously supplies catalytic material to the anode during electrolysis operation. This continuous replenishment ensures that the anode remains activated throughout its service life, maintaining reliable performance without interruption or degradation of the activation state.
Solution Approach 2:
The system recycles catalytic material from the cathode to the anode during operation. As the cathode releases catalytic material, it is transferred to the anode surface where it is retained and utilized. This recovery and reuse mechanism ensures continuous anode activation without loss of catalytic material from the system.
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
This method reduces the anodic overpotential, increases the efficiency of alkaline water electrolysis, and eliminates the need for pre-activation of anodes, allowing for sustained activation and reduced production costs.
Implementation Method 1
The anode catalytic material is released from the cathode into an electrolyte in the electrolytic cell by positioning the cathode in the electrolytic cell
Implementation Method 2
at least a part of the anode catalytic material so released is deposited at the anode by applying an electric voltage across the anode and the cathode
Implementation Method 3
The diaphragm is gas tight. The anode and the cathode are separated by the diaphragm
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A technique for in-situ anode activation in an electrolytic cell for alkaline water electrolysis is presented. The electrolytic cell includes an anode, a cathode and a diaphragm. At least a part of a surface of the cathode includes an electrically conducting stable material and an anode catalytic material. The anode catalytic material is adapted to be released from the cathode in alkaline water and be deposited at the anode when an electric voltage is applied across the anode and the cathode. The diaphragm is disposed between and separates the anode and the cathode. The diaphragm is gas tight and is permeable to the anode catalytic material. The anode catalytic material is released from the cathode into the electrolyte in the electrolytic cell and is deposited onto the anode thereby reducing overpotential at the anode and thus activating the anode simultaneously as the alkaline water electrolysis is performed.