Wang Haitao, Qiu Xiaoyu, Wang Wei, Jiang Lipei, Liu Hongfang
Key Laboratory for Green Chemical Process (Ministry of Education), School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, China.
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, China.
Front Chem. 2019 Dec 12;7:855. doi: 10.3389/fchem.2019.00855. eCollection 2019.
The unique micro/mesoporous spherical nanostructure composed of non-noble metal nanoparticles encapsulated within a heteroatom-doped carbon matrix provides great advantages for constructing advanced non-precious oxygen reduction (ORR) electrocatalysts. Herein, a promising oxygen electrocatalyst comprising iron sulfide (FeS) nanoparticles embedded into a nitrogen and sulfur co-doped carbon sphere (FeS/NS-CS) is successfully explored through a simple and fast polymerization between methylolmelamines (MMA) and ammonium ferric citrate (AFC) as well as a high-temperature vulcanization process. Moreover, the proposed polymerization reaction can be finished completely within a very short time, which is useful for large-scale manufacturing. Impressively, the developed FeS/NS-MCS catalyst demonstrates outstanding ORR catalytic activity in terms of a more positive onset and half-wave potential as well, as much a better methanol tolerance and stability, in comparison with that of Pt/C benchmarked catalyst. The remarkable ORR electrocatalytic properties are strongly associated with the favorable characteristic spherical N, the S co-doped porous graphitic carbon nanoskeleton incorporated with the FeS nanoparticle-encapsulation structure.
由包裹在杂原子掺杂碳基质中的非贵金属纳米颗粒组成的独特微/介孔球形纳米结构，为构建先进的非贵金属氧还原（ORR）电催化剂提供了巨大优势。在此，通过羟甲基三聚氰胺（MMA）和柠檬酸铁铵（AFC）之间简单快速的聚合反应以及高温硫化过程，成功探索出一种有前景的氧电催化剂，该催化剂由嵌入氮和硫共掺杂碳球（FeS/NS-CS）中的硫化铁（FeS）纳米颗粒组成。此外，所提出的聚合反应能在极短时间内完全完成，这对大规模制造很有用。令人印象深刻的是，与Pt/C基准催化剂相比，所制备的FeS/NS-MCS催化剂在起始电位和半波电位更正向方面表现出出色的ORR催化活性，同时具有更好的甲醇耐受性和稳定性。显著的ORR电催化性能与有利的球形N、S共掺杂多孔石墨碳纳米骨架以及FeS纳米颗粒封装结构密切相关。
