Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (5): 1341-1350.DOI: 10.1016/S1872-2067(21)63944-X

• Articles • Previous Articles     Next Articles

Improved nitrogen reduction electroactivity by unique MoS2-SnS2 heterogeneous nanoplates supported on poly(zwitterionic liquids) functionalized polypyrrole/graphene oxide

Hui Maoa, Haoran Yanga, Jinchi Liua, Shuai Zhanga, Daliang Liua, Qiong Wua, Wenping Sunc, Xi-Ming Songa(), Tianyi Mab()   

  1. aInstitute of Clean Energy Chemistry, Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, Liaoning, China
    bCentre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
    cSchool of Materials Science and Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2021-08-13 Accepted:2021-09-13 Online:2022-05-18 Published:2022-03-23
  • Contact: Xi-Ming Song, Tianyi Ma
  • Supported by:
    National Natural Science Foundation of China(51773085);National Natural Science Foundation of China(52071171);Liaoning Revitalization Talents Program - Pan Deng Scholars(XLYC1802005);Liaoning BaiQianWan Talents Program(LNBQW2018B0048);Natural Science Fund of Liaoning Province for Excellent Young Scholars(2019-YQ-04);Key Project of Scientific Research of the Education Department of Liaoning Province(LZD201902);Australian Research Council (ARC) Future Fellowship(FT210100298);Scientific Research Fund of Liaoning Provincial Education Department(LQN201903);Liaoning Revitalization Talents Program(XLYC2007132);Undergraduate Teaching Reform Project of Liaoning University(JG2020YBXM115)

Abstract:

Unique MoS2-SnS2 heterogeneous nanoplates have successfully in-situ grown on poly(3-(1-vinylimidazolium-3-yl)propane-1-sulfonate) functionalized polypyrrole/ graphene oxide (PVIPS/PPy/GO). PVIPS can attract heptamolybdate ion (Mo7O246-) and Sn4+ as the precursors by the ion-exchange, resulting in the simultaneous growth of 1T’-MoS2 and the berndtite-2T-type hexagonal SnS2 by the interfacial induced effect of PVIPS. The obtained MoS2-SnS2/ PVIPS/PPy/GO can serve as electrocatalysts, exhibiting good NRR performance by the synergistic effect. The semi-conducting SnS2 would limit the surface electron accessibility for suppressing HER process of 1T’-MoS2, while metallic 1T’-MoS2 might efficiently improve the NRR electroactivity of SnS2 by the creation of Mo-Sn-Sn trimer catalytic sites. Otherwise, the irreversible crystal phase transition has taken place during the NRR process. Partial 1T’-MoS2 and SnS2 have electrochemically reacted with N2, and irreversibly converted into Mo2N and SnxNz due to the formation of Mo-N and Sn-N bonding, meanwhile, partial SnS2 has been irreversibly evolved into SnS due to the reduction by the power source in the electrochemical system. It would put forward a new design idea for optimizing the preparation method and electrocatalytic activity of transition metal dichalcogenides.

Key words: MoS2, SnS2, Poly(3-(1-vinylimidazolium-3-yl)propane-1-sulfonate), functionalized polypyrrole/graphene oxide, Nitrogen reduction reaction, Irreversible crystal phase transition