Synergistically catalytic enhanced of Zn–N/Co–N dual active sites as highly efficient and durable bifunctional electrocatalyst for rechargeable zinc-air battery

Electronic Regulation of ZnCo Dual‐Atomic Active Sites Entrapped in 1D@2D Hierarchical N‐Doped Carbon for Efficient Synergistic Catalysis of Oxygen Reduction in Zn–Air Battery

“…This scenario is different from the previous research, in which the graphitic degree tends to increase as the temperature increases. [26] The inevitable evaporation of Zn in ZnCo-900 creates a large number of defects to further enlarge the I D /I G , [27] finally resulting in the enhanced graphitization of ZnCo-HNC, pyrolyzed at the standard temperature. Additionally, Figure S5, Supporting Information, displays the I D /I G of ZnCo-HNC, lying between Zn-800 (1.06) and Co-800 (0.93), which further confirms the significant influence of zinc evaporation on the enlargement in the defects.…”

“…In addition, the Zn-800 characterizes considerably higher R ct , due to the substantial defects provided by the carbon substrate that adversely deteriorate the charge transport. [27] Long-term stability is also one of the crucial parameters to estimate the possibility for practical applications of advanced catalysts. [41] As depicted in Figure 5G, the ZnCo-HNC presents negligible shift of the E 1/2 (18 mV) in the negative direction after continuous scan for 2000 cycles, which is smaller than Pt/C (20 mV, Figure S12, Supporting Information), indicating the excellent cyclic stability of the ZnCo-HNC.…”

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

“…The intensity of (111) crystal plane increases with the increase in the molar concentration of Co 2+ in solution A, implying that the lack of the “fence” effect of Zn results in the Co species tending to grow together during the pyrolysis and the formation of well-crystallized Co particles . It is hard to detect the corresponding crystal structure of Zn species by XRD, indicating that most of the Zn species are volatilized at 920 °C . Moreover, with increasing heat treatment temperature, the peak intensity of Co and carbon in the XRD patterns of Co0.2Zn0.4 increases significantly (Supporting Information (SI) Figure S1), suggesting that higher pyrolysis temperature results in the production of well-crystallized Co particles and higher level of graphitic carbon …”

Rugae‐like N‐doped porous carbon incorporated with Fe‐N x and Fe 3 O 4 dual active sites as a powerful oxygen reduction catalyst for zinc‐air batteries

“…Besides, the high‐resolution Zn 2 p has two typical peaks at 1021.1 and 1044.1 eV (Figure S6), which are attributed to the 2 p 3/2 and 2 p 1/2 electronic states of Zn 2+ , respectively. As the metallic Zn evaporates, the remaining Zn is in the form of Zn‐N 70 …”

“…Besides, the high-resolution Zn 2p has two typical peaks at 1021.1 and 1044.1 eV (Figure S6), which are attributed to the 2p 3/2 and 2p 1/2 electronic states of Zn 2+ , respectively. As the metallic Zn evaporates, the remaining Zn is in the form of Zn-N. 70 To investigate the dispersion level of the iron species, we conducted the following experiments. Firstly, we have impregnated the as-prepared Fe-NC-950 with 5 M HCl to remove Fe3O4.…”