Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 3, Pages 1183-1190Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.7b00293
Keywords
active site control; Schiff's base polymer; BIAN-paraphenylene copolymer; metal-free ORR; polymeric electrocatalyst; GO/polymer composite; aqueous/nonaqueous ORR; charge density analysis
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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We report design, synthesis, and performance evaluation of functional polymer material with defined active sites for oxygen reduction reaction (ORR) catalytic activity in aqueous as well as nonaqueous media. The BIAN-paraphenylene (BP) copolymer having an imine backbone was synthesized via solution based polycondensation. The as synthesized polymer itself showed ORR activity comparable to that of other doped carbon materials. The composites of the polymer with graphene oxide (GO) sheets (GO/BP) were also synthesized under moderate temperature conditions (400 degrees C) with the polymer remaining intact. The composites showed further enhanced electrochemical activity owing to the synergistic effect of GO and active site defined polymer material. We also tried to evaluate the nature and basis of catalytic activity on the polymer surface by different techniques. The cyclic voltammograms showed two distinct ORR peaks, indicating two different active sites. This was also in agreement with Mulliken charge distribution from DFT studies, which showed the presence of two different carbons next to nitrogen having different electropositive nature.
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