Introduction
Pure water electrolysis is core for green hydrogen generation and lab electrochemical testing, and electrode substrate material determines electrolytic stability and equipment service life. Many electrochemical equipment buyers inquire whether titanium can serve as electrolysis electrode material. This FAQ distinguishes cathode/anode usage difference, applicable titanium grades and factory procurement norms based on CNBJTI industrial titanium supply specifications.
Q1: Can titanium be directly used for pure water electrolysis electrodes?
Titanium performs differently on cathode and anode sides:
Cathode (reduction environment): Bare pure titanium works perfectly
Under cathodic protection status in pure water electrolyte, titanium will not form insulating passivation film; bare Grade2 pure titanium directly works as long-life cathode without extra coating, resisting electrolyte corrosion permanently.
Anode (oxidation environment): Uncoated bare titanium fails completely
High anodic potential triggers rapid dense insulating TiO₂ film generation on bare titanium surface, blocking electric current and terminating electrolysis. For anode application, titanium base needs ruthenium-iridium oxide coating to become DSA dimensionally stable anode, the mainstream industrial electrolysis anode material.
Q2: Preferred titanium grades for electrolysis electrode blanks
Grade2 Commercially Pure Titanium (Most widely used substrate)
Balanced ductility and corrosion resistance, stable in pure water medium, easy CNC machining and noble metal coating adhesion, standard raw material for industrial electrolysis electrode base.
Grade1 Pure Titanium: Ultra-high plasticity for ultra-thin lab electrode sheet stamping, compact small electrolytic cell components.
Grade5 Ti-6Al-4V Alloy: Rare for conductive electrode face; only applied for electrode fixed support frame due to higher alloy impurity risk causing electrolyte contamination.
Q3: Core advantages vs stainless steel electrode substrate
Superior anti-electrochemical corrosion: No metal ion dissolution polluting pure water electrolyte under long-term electrolytic operation; stainless steel gradually corrodes and releases impurity ions.
Stable dimensional stability: No thermal deformation under repeated electrolytic temperature fluctuation, reducing cell maintenance downtime.
Strong coating bonding: Titanium’s native oxide layer tightly locks noble metal coating, greatly extending coated anode service cycle vs steel-based DSA electrodes.
Q4: Buyer RFQ & incoming inspection tips
Clarify electrode purpose when ordering: bare for cathode or substrate needing coating for anode to confirm required finish.
Request ASTM B348 mill certificate, strictly control Fe/O impurity content, excess impurity reduces coating bonding and anti-corrosion performance.
Uncoated cathode titanium requires pickled clean surface free of oil stain or surface oxide residue.
Conclusion
Titanium is an ideal substrate for pure water electrolysis electrodes: uncoated Grade2 Ti for cathode, coated DSA titanium for anode; proper grade selection cuts long-term equipment replacement cost for hydrogen production and electrochemical projects.