Product Dec. 24, 2025
Hioki Receives Order for “ALDAS-E” Impedance Measurement System from CRIEPI
Hioki is pleased to announce that in November 2025, it received an order for its “ALDAS-E” impedance measurement system for water electrolysis cell stacks from the Central Research Institute of Electric Power Industry (CRIEPI). Through the provision of advanced equipment for research, development, and evaluation testing, Hioki continues to contribute to the realization of a hydrogen-based society and a sustainable future.
ALDAS-E
Background
Driving Decarbonization and the Hydrogen Society In recent year. Global efforts toward decarbonization and carbon neutrality have accelerated in recent years, bringing hydrogen into the spotlight as a next-generation clean energy source. Among these, green hydrogen—produced using renewable energy such as solar and wind power without CO₂ emissions—is considered a key enabler of a decarbonized society.
At the heart of green hydrogen production lies water electrolysis*1, a critical technology. Japan maintains a world-class competitive edge in this field, but challenges remain. In particular, evaluation technologies for ensuring the performance and reliability of large-scale water electrolyzers, essential for social infrastructure, are still under development.
- *1: Water Electrolysis – A technology that produces hydrogen by electrolyzing water or water vapor.
Details
In November 2025, HIOKI received an order for the "ALDAS-E" system from the Central Research Institute of Electric Power Industry (CRIEPI). The system is designed to measure the impedance of electrolytic cell stacks.
CRIEPI is currently conducting durability tests on Solid Oxide Electrolysis Cell (SOEC) stacks as part of the NEDO-commissioned project, "Development of Technical Platform for Evaluation and Analysis of High-Temperature Steam Electrolysis"*2.
The "ALDAS-E" contributes to the performance analysis of electrolytic cells and cell stacks, including SOECs. Its most significant feature is the ability to perform AC impedance measurement under high-current conditions required for real-world implementation.
Comment from Mr. Koichi Asano, Senior Researcher, Energy Chemistry Research Division, CRIEPI
"The ALDAS-E enables AC impedance measurement at high currents using practical-scale electrolytic cells and stacks. Its key advantage is that it can integrate into the high-current measurement lines of existing electrolysis evaluation systems, while ensuring high-precision measurement through its proprietary methodology. This makes impedance measurement more accessible and cost-effective, as it eliminates the need for specialized power supplies for electrolysis."
Product Overview
Enabling Real-World Evaluation with the ALDAS Method
While measurement methods for lab-scale small cells have existed, measuring under high-current conditions has traditionally been considered extremely difficult. The ALDAS-E combines a wide voltage/current measurement range with exceptional noise resistance, allowing evaluation of water electrolyzers and cell stacks operating at a practical scale. Under actual operating conditions, it supports detailed characteristic evaluation, condition monitoring, and cell degradation diagnosis.
About the ALDAS Method
This methodology applies HIOKI's expertise in impedance measurement (developed through AC-IR measurement for lithium-ion batteries) and high-precision current measurement (from power electronics evaluation). This synergy enables impedance evaluation of water electrolysis cell stacks and electrolyzers, which was previously considered a challenge.
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About HIOKI
Established in 1935, HIOKI E.E. CORPORATION (TSE: 6866) has grown to become a world leader in providing consistent delivery of test and measuring instruments through advanced design, manufacturing, and sales and services. By offering over 200 main products characterized by safety and quality while meeting an expansive range of applications, we aim to contribute to the efficiency and value of our customers' work in research and development, production and electrical maintenance. Hioki products and services are available around the world through our extensive network of subsidiaries and distributors. For more information, visit us at www.hioki.com.