Currents of Innovation: Oronzio De Nora and the Electrochemistry Heritage of Milan, 1923

During the early 1920s, Italy’s burgeoning chemical and metallurgical industries faced a severe bottleneck: the extraction of chlorine and caustic soda required fragile, inefficient electrolytic cells. Oronzio De Nora (1899–1995), a newly minted electrical engineer from Altamura who graduated from the Politecnico di Milano, designed a revolutionary mercury-cathode amalgam cell that dramatically reduced power consumption and generated high-purity chemicals at scale.

Establishing his engineering works and experimental laboratories in Milan on Via Bistolfi, De Nora quickly patented his design internationally, supplying turn-key electrolytic facilities to major industrial powers across Europe, Japan, and North America throughout the interwar era.

In the late 1960s, De Nora achieved another monumental breakthrough with the invention of Dimensionally Stable Anodes (DSA®)—titanium structures coated with noble metal oxides that replaced deteriorating graphite electrodes worldwide, saving billions of kilowatt-hours of electrical energy across global chemical industries.

Today, listed on the Milan Stock Exchange and recognized as an international pioneer in green hydrogen electrolyzers and clean water treatment, De Nora remains headquartered in Milan, carrying forward Oronzio’s century-old legacy of transformative electrochemical physics.