Nitrogen‐doped carbon structures have recently been demonstrated as a promising candidate for electrocatalytic CO2 reduction, while in the meantime the pyridinic and graphitic nitrogen atoms also present high activities for electroreduction of water. Here, an etching strategy that uses hot water steam to preferentially bind to pyridinic and graphitic nitrogen atoms and subsequently etch them in carbon frameworks is reported. As a result, pyrrolic nitrogen atoms with low water affinity are retained after the steam etching, with a much increased level of among all nitrogen species from 22.1 to 55.9%. The steam‐etched nitrogen‐doped carbon catalyst enables excellent electrocatalytic CO2 reduction performance but low hydrogen evolution reaction activity, suggesting a new approach for tuning electrocatalyst activity.

Nitrogen-doping represents a general and effective method in adjusting the physical and chemical properties of carbon nanomaterials. The recent progress in the synthesis of nitrogen-doped carbon nanomaterials and their applications in batteries are carefully discussed with a focus on their electrochemical properties.

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Hydrophobic core/hydrophilic sheath fibers have been designed for fiber-shaped dye-sensitized solar cells showing a record power conversion efficiency of 10%.

Figure 12. Illustration of suggestions for future research about organosulfur in LSBs.