KIER Breakthrough Solves Seawater Electrolysis Crisis with Self-Cleaning Dual Electrode System Design

KIER researchers develop a dual-electrode seawater electrolysis system that uses self-acidified water to clear mineral deposits, boosting efficiency 15-fold.

By: AXL Media

Published: Mar 17, 2026, 8:45 AM EDT

Source: Information for this report was sourced from National Research Council of Science & Technology

Overcoming the Mineral Barrier in Green Hydrogen

The global transition toward hydrogen as a sustainable energy source has faced a significant geographic and environmental hurdle: the scarcity of freshwater required for electrolysis. Seawater electrolysis has long been viewed as the logical alternative, yet it has been plagued by the rapid accumulation of magnesium and calcium precipitates on electrode surfaces. These mineral deposits act as a physical barrier that degrades performance and necessitates frequent, costly interruptions for acid washing or mechanical scrubbing. A research team led by Dr. Ji-Hyung Han at KIER has now dismantled this bottleneck by introducing a system that manages these deposits through architectural design rather than external intervention.

The World’s First Self-Cleaning Architecture

The innovation lies in a dual-cathode configuration that enables a continuous cycle of production and regeneration. In this world-first design, the system operates two electrodes in tandem: while one electrode actively splits seawater to produce hydrogen, the other remains in a standby state. The "cleaning" occurs naturally as the seawater surrounding the idle electrode becomes acidified during the electrochemical process. This acidified environment dissolves the accumulated mineral crusts without the need for supplemental chemicals. By alternating the roles of these electrodes every 48 hours, the system maintains a pristine surface for hydrogen evolution, effectively creating a "self-cleaning" mechanism.

Dramatic Gains in Long-Term Energy Efficiency

The performance data from the KIER experiments highlight a massive leap in operational stability compared to traditional single-electrode systems. In conventional seawater electrolysis, energy consumption typically spikes by 27% within just 200 hours as mineral buildup forces the system to work harder. In contrast, the dual-electrode system demonstrated a negligible energy increase of only 1.8% after 400 hours of continuous operation. This represents a 15-fold improvement in sustained performance. By preventing the runaway energy costs associated with mineral scaling, this technology makes large-scale seawater hydrogen production economically viable for the first time.