Details

Autor(en) / Beteiligte

• Li, Xin-Ran
• Zhang, Qin-Hao
• Meng, Xian-Ze
• Wu, Lian-Kui
• Cao, Fa-He

Titel

Effect of pretreatments on the hydrogen evolution kinetics of pure titanium using impedance and SECM technologies

Ist Teil von

• Corrosion science, 2021-10, Vol.191, p.109726, Article 109726

Ort / Verlag

Amsterdam: Elsevier Ltd

Erscheinungsjahr

2021

Quelle

ScienceDirect

Beschreibungen/Notizen

• A modified tip generation/substrate collection mode of SECM was used to separate the hydrogen evolution reaction (HER) current from the coupled multireaction current on pure titanium spontaneously passivated in air (P-Ti), activated by electrochemical method (EA-Ti) and fluoride ion (FA-Ti). Besides, the HER kinetics of Ti electrodes pretreated by different approaches were also simulated. The pretreatments influence the HER behavior and kinetics on Ti through changing the electronic structure of passive film. [Display omitted] •Effect of pretreatment on HER behavior and kinetics of Ti was studied.•Coupled multireaction current on Ti was quantitatively separated by modified TG/SC mode of SECM.•Kinetics parameters of HER on Ti with different pretreatment were simulated.•Pretreatment change the electronic structure of passive film thus affect HER on Ti. The behaviors and kinetics of hydrogen evolution reaction (HER) on pure titanium spontaneously passivated in air (P-Ti), activated by electrochemical method (EA-Ti) and fluoride ion (FA-Ti) were investigated by impedance and scanning electrochemical microscopy (SECM). During cathodic polarization, the passive film and proton were simultaneously reduced on P-Ti, only HER current was detected on EA-Ti, while both HER and active/passive transition behavior presented on FA-Ti. Corresponding transfer coefficients and standard rate constants of HER are 0.48/6.00 × 10−12 cm/s, 0.25/7.60 × 10−7 cm/s and 0.24/1.14 × 10−6 cm/s, respectively. These differences originate from the change in electronic structure of passive film by pretreatments.