Heteroatom-doped carbon plays a vital role in the field of energy storage and conversion, and the synthesis of them has intimate relation with doping pathways. In this work, a facile two-step doping pathway, i.e., hydrothermal method followed by thermal annealing process, was employed to prepare annealed three-dimensional N,S-codoped graphene framework (3D A-NSG). The morphology, structure, composition, and related electrochemical performance were all studied. The results showed that A-NSG possessed typical 3D thin nanosheets, much increased specific surface area and structural defects, strengthened conductivity, and optimized N and S configurations (especially for dominated pyridinic N as well as graphitic N and–C–S–C–). As a result, A-NSG presented much better capacitance and oxygen reduction reaction performance than the counterparts. Apparently, our work offers a good guidance on the synthesis of advanced heteroatom-doped carbon materials by adjusting the doping strategy.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51804116, 51772092, and 51873059), Natural Science Foundation of Hunan Province, China (Grant Nos. 2018JJ3207 and 2017JJ2103), Hunan Province College Students Research Learning and Innovative Experiment Project (Grant No. 716). Prof. Zhaohui Hou, Wenyuan Xu, and Yong Tao as well as Miss Yajing Li were appreciated for their experiment guidance and manuscript polishment.
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Chen, L., Shi, M., He, B. et al. Effect of two-step doping pathway on the morphology, structure, composition, and electrochemical performance of three-dimensional N,S-codoped graphene framework. Journal of Materials Research 34, 1993–2002 (2019). https://doi.org/10.1557/jmr.2019.107