Switchable electrode functionalized with an azobenzene-containing copolymer thin film using the Langmuir–Schaefer technique for a “smart” uric acid/air fuel cell

Fengjin Qu, Xiaoyan Ma, Lin Zhu, Fang Chen

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A new photoswitchable electrode triggered by a brief light signal was fabricated by depositing an azobenzene-containing copolymer on an indium tin oxide substrate decorated with gold nanoparticles. The polymer formed a compact, complete thin film on the electrode surface using the Langmuir–Schaefer technique and offered reversible and stable switching performance. The conductivity and hydrophilicity of the electrode changed under UV/visible light due to the photoisomerization of the azobenzene moieties in the polymer film, influencing electron transfer and mass transport at the electrode. The electrochemical characterization demonstrated that the electrode exhibited reversibly switchable electrochemical behavior. In its active state, the as-prepared electrode possessed efficient electrocatalytic capability towards uric acid oxidation with a maximum anodic current density of 0.97 mA·cm− 2. The uric acid/air fuel cell assembled from the photo-triggered anode and a Pt/C-modified cathode operated with an open circuit voltage of 0.12 V and a maximum power density of 41.33 μW·cm− 2. The cell exhibited reversible switching performance (four cycles) and high stability: after one month the power output was 94.2% of the original maximum value.

Original languageEnglish
Pages (from-to)49-53
Number of pages5
JournalElectrochemistry Communications
Volume77
DOIs
StatePublished - 1 Apr 2017

Keywords

  • Fuel cell
  • Langmuir–Schaefer
  • Stimuli-responsive polymer
  • Switchable electrode
  • Uric acid

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