Baronia Richa, Goel Jyoti, Singhal Sunil Kumar
AcSIR-Academy of Scientific & Innovative Research, CSIR-National Physical Laboratory Campus, New Delhi 110012, India.
CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India.
J Nanosci Nanotechnol. 2021 Mar 1;21(3):1721-1727. doi: 10.1166/jnn.2021.18992.
In the development of direct methanol fuel cell (DMFC) the fabrication of an anode comprising of a Pt or Pt-based bi or tri-metallic alloys nanoparticles on a suitable support material having higher stability, higher surface area, electrical conductivity and strong interaction is very important. In the present work we have solved this problem by using a nanocomposite of reduced graphene oxide (rGO) and graphitic carbon nitride (g-C₃N₄) as the support material and deposited PtCo nanoparticles by chemical reduction. The electro-oxidation of methanol is carried out in an acidic medium. The electrochemical behaviour of as-synthesized PtCo/rGO-gC₃N₄ catalyst was found to be much superior to Pt/rGO-g-C₃N₄ catalysts towards electro-oxidation of methanol and is mainly due to the homogeneous dispersion of PtCo nanoparticles onto rGO-g-C₃N₄ nano composite, higher electrical conductivity and a strong interaction between metal nanoparticles and N group of the support material. By using the as-synthesized electro-catalyst the adsorption or poisoning of Pt due to CO is greatly reduced and more active Pt sites are created for the electro-oxidation of methanol. Thus, the as-synthesized electro-catalyst can be used as an efficient anode material in a direct methanol fuel cell.
在直接甲醇燃料电池（DMFC）的研发中，在具有更高稳定性、更大表面积、导电性和强相互作用的合适载体材料上制备由铂或铂基二元或三元合金纳米颗粒组成的阳极非常重要。在本工作中，我们通过使用还原氧化石墨烯（rGO）和石墨相氮化碳（g-C₃N₄）的纳米复合材料作为载体材料，并通过化学还原沉积铂钴纳米颗粒，解决了这个问题。甲醇的电氧化在酸性介质中进行。结果发现，合成的PtCo/rGO-gC₃N₄催化剂在甲醇电氧化方面的电化学性能远优于Pt/rGO-g-C₃N₄催化剂，这主要归因于铂钴纳米颗粒在rGO-g-C₃N₄纳米复合材料上的均匀分散、更高的导电性以及金属纳米颗粒与载体材料的N基团之间的强相互作用。通过使用合成的电催化剂，铂因一氧化碳导致的吸附或中毒大大减少，并且为甲醇的电氧化创造了更多活性铂位点。因此，合成的电催化剂可作为直接甲醇燃料电池中的高效阳极材料。
