负载硫化钴纳米颗粒的N、S共掺杂石墨烯氧还原电催化剂的制备及性能

采用D-氨基葡萄糖作为Co分散剂和碳源,硫脲作为氮源和硫源,以NaCl为模板制备负载硫化钴纳米颗粒的N、S共掺杂三维石墨烯氧还原电催化剂(CoS/N/S/rGO)。CoS/N/S/rGO具有良好的氧还原反应(ORR)活性,起始电位和半波电位分别为960和815 mV,性能与商业Pt/C相当。此外,CoS/N/S/rGO表现出明显的4电子转移特性和超低的过氧化氢产率。与基于Pt/C的锌-空气电池相比,基于CoS/N/S/rGO的锌-空气电池在6 mol·L~(-1) KOH和0.2 mol~(-1) Zn(CH_3COO)_2碱性电解质中显示出更高的恒电流放电性能以及更好的稳定性。

Preparation and Performance of N and S Co-doped Graphene Loaded Cobalt Sulfide Nanoparticles Oxygen Evolution Electrocatalyst

The three-dimensional N and S co-doped graphene loaded cobalt sulfide nanoparticles oxygen evolution electrocatalyst (CoS/N/S/rGO) was prepared by using D-glucosamine as the Co dispersant and carbon source, thiourea as the nitrogen source and sulfur source, and NaCl as the template, achieving N and S co-doping and uniformly loading two kinds of nanoparticles Co₉S₈ and Co₄S₃. CoS/N/S/rGO had good oxygen reduction reaction (ORR) activity with initial potential of 960 mV and half-wave potential of 815 mV, respectively, which was similar to commercial Pt/C. In addition, CoS/N/S/rGO showed obvious four-electron transfer characteristics and ultra-low hydrogen peroxide production rate. Compared with Pt/C based zinc-air battery, CoS/N/S/rGO based zinc-air battery showed higher constant current discharge performance and better stability in 6 mol·L^-1 KOH and 0.2 mol·L^-1 Zn(CH₃COO)₂ alkaline electrolyte.