I. Overview of Alkaline Water Electrolysis for Hydrogen Production Systems

Alkaline water electrolysis (ALK) refers to the technology of producing hydrogen by electrolyzing water in an alkaline electrolyte environment. The electrolyte is typically a 30% (w/w) potassium hydroxide (KOH) solution. The alkaline water electrolysis for hydrogen production system mainly consists of the alkaline electrolyzer and a BOP (Balance of Plant) auxiliary system. The anode and cathode plates do not require precious metal materials, effectively reducing the manufacturing cost of the electrolyzer and possessing significant economic advantages. It is currently one of the mainstream technologies for large-scale green hydrogen production.

Figure 1. ALK Hydrogen Production System Structure Diagram

II. Alkaline Electrolyzer - Core Equipment

1. Composition of the Alkaline Electrolyzer:

The main body of the alkaline electrolyzer is assembled from core components such as end plates, sealing gaskets, electrode plates, electrodes, and diaphragms. The entire unit consists of dozens to hundreds of electrolysis chambers. These chambers are fixed to the end plates by screws, forming a cylindrical or square structure. Each chamber is divided by two adjacent electrode plates and specifically includes six core components: positive and negative bipolar plates, anode, diaphragm, sealing gasket, and cathode. These components work together to ensure a stable and efficient electrolysis reaction.

Figure 2. Photograph of the Electrolyzer

2. Working Principle of an Alkaline Electrolyte:

When a DC voltage is applied between the anode and cathode of an alkaline electrolyte, a stable electric field is formed between the electrodes. Driven by this electric field, hydroxide ions (OH-) near the anode undergo a redox reaction and are continuously consumed, causing their concentration to decrease. Meanwhile, water molecules near the cathode undergo a reduction reaction, generating a large number of hydroxide ions, leading to a continuous increase in their concentration. To maintain the dynamic balance of ion concentration in the electrolyte, hydroxide ions migrate from the cathode chamber to the anode chamber through the diaphragm. Simultaneously, electrons flow from the anode to the cathode through the external circuit, forming a closed current, thus realizing the conversion of electrical energy into chemical energy, ultimately causing water molecules to continuously decompose into hydrogen (H2) and oxygen (O2).

Anodic oxidation reaction: 4OH- - 4e- = H2O + O2↑

Cathode reduction reaction: 2H2O + 2e- = 2OH- + H2↑

Classification of Electrolyzers by Different Types

III. Conclusion

Driven by the "dual carbon" goals, the green hydrogen industry is entering a phase of rapid development. Alkaline water electrolysis for hydrogen production, as a technologically mature and cost-controllable green hydrogen production route, plays a crucial role. As core equipment, the alkaline electrolyzer has various technical routes (whether it's nipple plates vs. flat plates, metal electrodes vs. resin electrodes, or PPS membranes vs. composite membranes) each with its suitable scenarios and performance trade-offs. There is no absolutely optimal solution; a reasonable selection must be made based on specific application requirements. The performance of alkaline electrolyzers is continuously being optimized, with energy consumption decreasing and lifespan increasing, further enhancing its economic viability and potential for large-scale application. In the future, alkaline electrolyzers, with their core advantages such as high technological maturity, large single-unit capacity, and no need for precious metal catalysts, will continue to lead large-scale green hydrogen projects, playing a vital role in the development of the green hydrogen industry and providing strong support for achieving the "dual carbon" goals.

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