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Improved oxygen reduction performance of a N, S co-doped graphene-like carbon prepared by a simple carbon bath method
New Carbon Materials ( IF 6.5 ) Pub Date : 2020-11-13 , DOI: 10.1016/s1872-5805(20)60506-6
Xiao-wen Ye , Li-bing Hu , Min-cong Liu , Gang Wang , Feng Yu

Rationally designing and optimizing metal-free electrocatalysts for the oxygen reduction reaction (ORR) isof great importance for fuel cells and metal-air batteries, but remains a great challenge. A N,S-codoped graphene-like carbon (GLC) was synthesized by a simple carbon-bath pyrolysis method, in which urea and thiourea (1:1 w/w) were used as both the sacrificial template and source of nitrogen and sulfur, and glucose as the carbon precursor. A mixture of these materials was placed in a crucible that was contained in a larger crucible full of carbon powder. Compared with N-doped or S-doped GLCs synthesized using only urea or thiourea, respectively, the N,S-codoped GLC had a pore volume of 0.63 cm3/g and a larger specific surface area of 583.68 m2/g, the highest micropore to total surface area of 29.39% and micropore to total pore volume of 12.70%, and the highest pyridinic-N and graphitic-N content of up to 92.2%.The N,S-codoped GLC showeda high electrocatalytic activity for ORR with a mid-wave potential (E1/2) of 0.82 VRHE, which was more positive than that of Pt/C (E1/2=0.80 VRHE) in an alkaline electrolyte. The N,S-codoped GLC catalyst had better stability and superior methanol tolerance compared with commercial Pt/C (20 wt%), abenchmark catalyst.



中文翻译:

通过简单的碳浴法制备的N,S共掺杂的类石墨烯碳的氧还原性能得到改善

合理设计和优化用于氧还原反应(ORR)的无金属电催化剂对燃料电池和金属空气电池至关重要,但仍然是一个巨大的挑战。通过简单的碳浴热解法合成了AN,S掺杂的石墨烯样碳(GLC),其中尿素和硫脲(1:1 w / w)用作牺牲模板和氮和硫的来源,葡萄糖是碳的前体 将这些材料的混合物放在坩埚中,坩埚装在装满碳粉的较大坩埚中。与仅使用尿素或硫脲合成的N掺杂或S掺杂的GLC相比,N,S掺杂的GLC的孔容为0.63 cm 3 / g,较大的比表面积为583.68 m2 / g,最高的微孔占总表面积的29.39%,最高的微孔占总孔的体积的12.70%,吡啶-N和石墨-N的含量最高,高达92.2%。中波电位(E 1/2)为0.82 V RHE的ORR的电催化活性,比碱性电解液中的Pt / C(E 1/2 = 0.80 V RHE)强。与市售Pt / C(20 wt%)基准催化剂相比,N,S掺杂的GLC催化剂具有更好的稳定性和优异的甲醇耐受性。

更新日期:2020-11-13
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