Zinc-Hydrogen Battery for Simultaneous Energy Storage and Hydrogen Production
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Solution Overview
Problem
Current electrochemical systems for co-generating electrical energy and hydrogen face significant technological challenges, including high costs, low efficiency, and complexity, particularly in water electrolysis and fuel cell technologies, which only restore 25-30% of initial electrical energy.
Innovation Solution
A process involving zinc electrolysis and reversible zinc-hydrogen battery systems, where a single cell functions as both an electrolysis cell and a battery, using optimized electrode materials and configurations to enhance efficiency and reduce ohmic losses, allowing for simultaneous storage and recovery of electrical energy and hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water electrolysis and fuel cells are used for energy storage and recovery, then hydrogen production and electrical energy restoration are achieved, but the system cost and device complexity increase significantly
Solution Approach 1:
The patent combines the electrolysis cell and fuel cell into a single integrated device that can operate in two modes: during electrolysis mode, it produces hydrogen and stores electrical energy; during fuel cell mode, it consumes hydrogen to restore electrical energy. This merging eliminates the need for separate systems and reduces overall device complexity while maintaining energy storage and recovery functionality.
Solution Approach 2:
The electrochemical cell is designed to perform multiple functions: it can operate as an electrolysis cell for hydrogen production and energy storage, and as a fuel cell for energy restoration. The same physical device and components serve dual purposes, making the system more versatile and reducing the number of separate components needed.
2Reliability
If water electrolysis and fuel cells are used for energy storage and recovery, then hydrogen production and electrical energy restoration are achieved, but the production cost increases due to expensive catalysts and technological marvels
Solution Approach 1:
The patent employs less expensive electrode materials and catalysts compared to conventional high-performance electrolyzers and fuel cells. By using more affordable materials that may have shorter lifetimes or lower performance margins, the overall production cost is reduced while still achieving functional energy storage and recovery capabilities.
Solution Approach 2:
The invention optimizes operational parameters such as voltage, current density, and temperature to achieve efficient energy conversion without requiring expensive high-performance materials. By adjusting these parameters, the system achieves acceptable performance at lower cost points.
3Quantity of substance
If conventional electrolysis and hydrogen compression are used, then hydrogen storage is achieved, but only 25-30% of initial electrical energy is restored
Solution Approach 1:
The patent maintains continuous electrochemical reactions within the cell during both electrolysis and fuel cell modes, avoiding energy losses associated with mechanical compression and decompression of hydrogen. The electrochemical conversion process continuously transforms electrical energy to chemical energy and back, minimizing energy dissipation and improving overall restoration efficiency.
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 process achieves an efficiency of 64% in energy recovery and hydrogen production, comparable to existing electrolysers, with the potential to restore 50% of stored electrical energy, offering a cost-effective and flexible solution for fixed electrical energy storage and hydrogen generation.
Implementation Method 1
an electricity storage phase by electrolysis of a solution of an electrolysable metal and formation of an electrolyzable metal-hydrogen battery
Implementation Method 2
an electricity recovery phase and generation of hydrogen by operation of said battery
Implementation Method 3
electrolysis of water, the storage of hydrogen and the restitution of the electrical energy potentially contained in the hydrogen
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for the simultaneous cogeneration of electrical and hydrogen power by a totally electrochemical process, comprising: a step of storing electricity by means of electrolyzing a solution of an electrolyzable metal and forming an electrolyzable metal/hydrogen battery; and a step of recovering electricity and generating hydrogen by means of the operation of said battery. The electrolyzable metal is selected from among zinc, nickel and manganese.