物理化学学报 >> 2010, Vol. 26 >> Issue (01): 237-243.doi: 10.3866/PKU.WHXB20091221

材料物理化学 上一篇    下一篇

碳纤维上电沉积Pd-Ag合金纳米粒子链及其氢传感性能

周保平, 余刚, 欧阳跃军, 司薇薇, 乔利杰   

  1. 湖南大学化学化工学院, 化学生物传感与计量学国家重点实验室, 长沙 410082; 怀化学院化学化工系, 湖南 怀化 418000; 北京科技大学腐蚀与防护中心, 环境断裂教育部重点实验室, 北京 100083
  • 收稿日期:2009-07-13 修回日期:2009-08-24 发布日期:2009-12-29
  • 通讯作者: 余刚 E-mail:yuganghnu@163.com

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

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摘要：

在碳纤维上采用三脉冲电沉积的方法制备出钯银合金纳米粒子链. 把表面覆盖有Pd-Ag合金纳米粒子链的碳纤维组装成氢气传感器. 采用扫描电子显微镜(SEM)和X射线能谱(EDX)表征了合金纳米粒子链的形貌和成分, 应用CHI660B电化学工作站测试其氢传感性能. 结果表明, 在钯、银离子摩尔比为15:1的电解液中, 在-1.0 - -1.5 V下, 成核5-40 ms; 在-0.25 - -0.35 V, 生长200-300 s的条件下, 即可获得银的质量分数为16.0%-25.0%的钯银合金纳米粒子链阵列. 在室温下, 传感器对在0.30%-5.00%(φ, 体积分数, 下同)范围内的氢气有响应, 最快响应时间约为300 s, 灵敏度最高可达31.0%; 氢在0.30%-1.20%的范围内响应电流与氢气浓度成线性关系, 超过4.00%时响应电流不再随浓度的增加而变化; 在低于3.50%的浓度下氢传感器的重现性良好.

关键词: 电沉积, Pd-Ag 合金, 纳米粒子链, 氢传感, 碳纤维

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