Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (01): 237-243.doi: 10.3866/PKU.WHXB20091221

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Electrodeposition of Pd-Ag Alloy Nanoparticle Chains on Carbon Fibers and Their Hydrogen Sensing Properties

ZHOU Bao-Ping, YU Gang, OUYANG Yue-Jun, SI Wei-Wei, QIAO Li-Jie   

  1. State Key Laboratory of Chemo/Biosensing and Chemometrics, School of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China; Department of Chemistry and Chemical Engineering, Huaihua College, Huaihua 418000, Hunan Province, P. R. China; Key Laboratory of Environmental Fracture, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, P. R. China
  • Received:2009-07-13 Revised:2009-08-24 Published:2009-12-29
  • Contact: YU Gang E-mail:yuganghnu@163.com

Abstract:

Pd-Ag alloy nanoparticle chains were fabricated on carbon fibers using three-pulse electrodeposition method. Pd-Ag alloy nanoparticle chains on carbon fiber surfaces can be used as hydrogen sensors. Scanning electron microscopy (SEM) andX-ray spectroscopy (EDX) were used to characterize the morphology and composition of the alloy nanoparticle chains. A CHI660B electrochemical workstation was used to evaluate the hydrogen sensing ability. Results show that Pd-Ag alloy nanoparticle chain arrays with a silver content of 16.0%-25.0%(w) were obtained in the electrolyte with an ion concentration ratio (molar ratio) of palladium to silver of 15:1. At -1.0 - -1.5 V nucleation took place within 5-40 ms and at -0.25 - -0.35 V growth was allowed for 200-300 s. The sensors responded to hydrogen gas at concentrations of 0.30%-5.00% (φ, volume fraction) at roomtemperature. The fastest response time was about 300 s and 31.0% sensitivity was obtained. The response current was linearly proportional to the hydrogen concentrations from 0.30% to 1.20%(φ). The current signal did not change with the hydrogen concentration larger than 4.00%. These hydrogen sensors show good reproducibility at hydrogen concentrations lower than 3.50%.

Key words: Electrodeposition, Pd-Ag alloy, Nanoparticle chain, Hydrogen sensing, Carbon fiber

MSC2000: 

  • O646