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Zinc‐ion storage is a promising electrochemical energy field due to loads of its advantages like easy preparation, environmental friendliness, high safety performance, and high capacity. Carbon materials have been widely studied for zinc‐ion storage due to their extraordinary properties such as earth‐abundancy, low‐cost, good electrical conductivity, various structures, and good stability. This article reviews some widely used carbon materials in zinc ion storage devices, including hollow carbon spheres, activated carbon, N‐doped porous carbon, graphene, and carbon nanotubes. The unique roles and advantages of these carbon materials in both zinc ion supercapacitors and zinc ion batteries are emphasized. Characteristics and functionalizations of different carbon materials are also comparatively discussed in view of zinc‐ion energy storage devices. Finally, some challenges and perspectives of carbon materials in zinc‐ion energy storage are outlined.

Batch reaction experiments were performed to investigate the salt effect on the yield of trioxane in the reaction solution. The salts considered include NaHSO 4 , Na 2 SO 4 , NaH 2 PO 4 , Na 2 HPO 4 , KCl, NaCl, LiCl, ZnCl 2 , MgCl 2 , and FeCl 3 . The effects of the anionic structure and the cation charge density on the yield of trioxane in the reaction solution were elucidated and the mechanisms that govern such effects were established. It is shown that the first four salts exerted a negative effect on the yield of trioxane in the reaction solution and such an effect increased progressively from left to right. This trend is due to the formation of NaHSO 4 , H 3 PO 4 , or (H 3 PO 4 and NaH 2 PO 4 ), which decreased the concentration of H + in the solution. The latter six salts showed a positive effect on the yield of trioxane in the reaction solution. The salt effect paralleled the ability of the salt to decrease the water activity of the reaction solution and followed the order KCl < NaCl < LiCl < ZnCl 2 < MgCl 2 < FeCl 3 . Continuous production experiments were performed to investigate the salt effect on the concentration of trioxane in the distillate. The salts considered were KCl, NaCl, LiCl, ZnCl 2 , MgCl 2 , and FeCl 3 , and the salt effect increased progressively from left to right. Such an effect was shown to be determined by the ability of the salt to increase the yield of trioxane in the reaction solution and to increase the relative volatilities of trioxane and water and of trioxane and oligomers.

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Supplementary Figure S1. Rarefaction curves of samples (n = 8) clustered at 97% sequence identity. OTU, operational taxonomic unit; CON, Control group; EF, Group II (7.5 • 10 8 cfu Enterococcus faecalis/kg diet).

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