| LYU Xiaomeng,ZHAO Mengyuan,HUA Shaochun,JIA Ying,JIN Guofeng,SHEN Keke,ZHOU Wanting.Preparation of Bimetallic Catalysts by Pulsed Electrodeposition and Its Electrochemical Performance Study[J],53(6):206-213 |
| Preparation of Bimetallic Catalysts by Pulsed Electrodeposition and Its Electrochemical Performance Study |
| Received:August 16, 2022 Revised:February 05, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.06.019 |
| KeyWord:pulsed electrodeposition bimetallic catalysts glassy carbon electrode surface modification UDMH |
| Author | Institution |
| LYU Xiaomeng |
Rocket Force University of Engineering, Xi'an , China |
| ZHAO Mengyuan |
Rocket Force University of Engineering, Xi'an , China |
| HUA Shaochun |
Chongqing Military Representative Office, Equipment Department of the PLA Rocket Force, Chongqing , China |
| JIA Ying |
Rocket Force University of Engineering, Xi'an , China |
| JIN Guofeng |
Rocket Force University of Engineering, Xi'an , China |
| SHEN Keke |
Rocket Force University of Engineering, Xi'an , China |
| ZHOU Wanting |
Rocket Force University of Engineering, Xi'an , China |
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| Abstract: |
| The work aims to prepare composite catalysts with good electrocatalytic activity response to unsymmetrical dimethylhydrazine. The pulsed electrodeposition method was used to prepare AuPd, AuPt and PdPt catalysts on glassy carbon electrodes. The working electrode was a glassy carbon electrode with a diameter of 3 mm. The counter electrode was a platinum wire electrode and the reference electrode was a saturated glycolic electrode (SCE). The effects of duty cycle, upper and lower limit potentials, pulse frequency and deposition time were investigated, and the surface morphology and crystal structure were characterized by scanning electron microscopy and X-ray diffraction. And the catalyst oxygen reduction reaction (ORR) activity and electrocatalytic oxidation activity towards unsymmetrical dimethylhydrazine (UDMH) were investigated by electrochemical cyclic voltammetry. All three catalysts were alloyed. The AuPd catalyst was a unique nanodendritic structure with an Au∶Pd element ratio of 1∶1 and an average particle size of 20 nm. The AuPt catalyst was a unique nanosphere structure with an Au∶Pt element ratio of 2∶3 and an average particle size of 100 nm. The PdPt catalyst was a homogeneous nanoparticle with a Pd:Pt element ratio of 1∶1 and an average particle size of 1.7 nm. The best ORR activity of the AuPd catalysts was achieved when the duty cycle was 1∶10, the upper and lower potentials were 0.7 V and 0.3 V, the deposition frequency was 10 Hz and the deposition time was 20 min; The best ORR activity of the PdPt catalysts was achieved when the duty cycle was 1∶30, the upper and lower potentials were 1.1 V and ‒0.1 V and the deposition frequency was 0.05 Hz; The best ORR activity of AuPt catalyst was achieved when the duty cycle was 1:10, the upper and lower limit potentials were 1.3 V and ‒0.2 V, the deposition frequency was 0.5 Hz and the deposition time was 10 min. It was worth noting that the ORR activity of the PdPt catalyst showed a linear relationship with the deposition time over a range. Previous surface morphology analysis showed that the small and homogeneous particles of the PdPt catalyst were the main reason for the good linear relationship between deposition time and ORR activity. The effective catalytic area of the PdPt catalyst could be precisely controlled by adjusting the deposition time. The CV curve showed that AuPd and AuPt catalysts showed double oxidation peaks similar to methanol oxidation. The UDMH oxidation peaks appeared around 0.7 V for the positive sweep and around 0.3 V for the negative sweep, while the PdPt and Pt/C catalysts had no significant UDMH oxidation peaks at these two locations. The integration of the oxidation peaks from 0.3 V to 0.8 V was calculated to be as high as 0.23 mAV/cm2 for AuPd and 0.25 mAV/cm2 for AuPt. The Au-based AuPd and AuPt composite catalysts prepared by pulsed electrodeposition method show higher electrocatalytic activity to UDMH compared with the PdPt catalysts and commercial Pt/C catalysts. It provides a new idea for the establishment of electrochemical catalytic oxidation based degradation of high concentration UDMH waste streams. |
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