Introduction to PEM Electrolyzers and Hydrogen Energy

The Role of Hydrogen in Future Energy Systems

Hydrogen is emerging as a cornerstone of low-carbon energy systems due to its flexibility and compatibility with renewable power [].

Overview of Water Electrolysis Technologies

There are three main types of electrolyzers: alkaline (AEL), proton exchange membrane (PEM), and solid oxide (SOEC). Their key differences are summarized below.

Technology	Strengths	Limitations	Best use case
AEL	Mature, lower cost, robust long-term operation	Lower current density, slower dynamic response, bulkier systems	Large-scale steady hydrogen production
PEM	High current density, compact design, fast response, high-purity hydrogen	Higher cost, reliance on noble catalysts, membrane durability concerns	Coupling with variable renewable electricity
SOEC	High efficiency potential at high temperature, possible heat integration and co-electrolysis	Lower technology maturity, thermal cycling constraints, higher system complexity	Industrial sites with available high-temperature heat

Advantages and Challenges of PEM Electrolyzers

Key advantages include high current density and rapid response. Challenges include material cost and membrane durability.

Structure and Goal of This Book

This book addresses modeling and control of PEM electrolyzers, intended for engineers and researchers working in hydrogen energy.