A N-Rich porous carbon nanocube anchored with Co/Fe dual atoms: an efficient bifunctional catalytic host for Li–S batteriesElectronic supplementary information (ESI) available: Fig. S1: (a) SEM images of PCN-224. (b) SEM images of PCN-224-CoFe. (c) XRD patterns of PCN-224, PCN-224-CoFe and simulate PCN-224. Fig. S2: FT-IR spectra of PCN-224 and PCN-224-CoFe. Fig. S3: Raman spectra for NC, Co–NC, Fe–NC and CoFe–NC. Fig. S4: high-resolution C 1s XPS spectra of CoFe–NC. Fig. S5: (a) XRD patterns of S@CoFe–NC, (b) TGA of S@CoFe–NC in N2. Fig. S6: (a and b) SEM and TEM images of S@CoFe–NC, (c) elemental mapping images of a single S@CoFe–NC. Fig. S7: (a) CV curves of S@NC at 0.1 mV s−1. (b) CV curves of symmetric cells using NC without Sulfur as an electrode with 0.5 M Li2S6 in electrolyte at a scan rate of 50 mV s−1 within a voltage window of −1.0 to 1.0 V. Fig. S8: (a and b) liner sweep voltammetry curves obtained from Fig. 3(e) and the insets are corresponding Tafel plots. Fig. S9: CV curves of S@NC at different scan rates. Fig. S10: (a and b) S 2p XPS spectra of Li anode surface after 100 cycles of S@CoFe–NC and S@NC. (c) UV-vis absorption spectra of electrolytes after 100 cycles of S@CoFe–NC and S@NC. (d) Optical photographs of the separators after 100 cycles of S@CoFe–NC and S@NC. See DOI: https://doi.org/10.1039/d2qm00360k

Authors: Xu, Mu-Han, Wang, Ya-Hui, He, Wei-Huan, Li, Xiao-Dong, Meng, Xin-Hai, Li, Cai-Cai, Li, Xue-Ting, Kong, Qing-Hua, Shen, Laifa, Zhang, Juan, Zhang, Xing, Xin, Sen, Guo, Yu-Guo

Source: Materials chemistry frontiers. 6(15):2095-2102

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