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A simple approach has been designed for the synthesis of mesoporous silicon carbide-derived carbon nanowires (SiC-CDC NWs) for supercapacitor applications.

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Carbide-derived materials including porous carbon and MXenes have received tremendous interest in recent years. Herein, we report a sustainable route direct from low-cost metal oxides/carbon (MOs/C) powders to metal carbides (MCs) and then to porous carbidederived carbons (CDCs). With the assistance of a solid oxide membrane (SOM), Cr 7 C 3 and Cr 2 AlC have been first synthesized from Cr 2 O 3 /C and Cr 2 O 3 /Al 2 O 3 /C powder mixtures, respectively. The synthesis pathway typically comprises electrochemical compounding, electrochemical reduction, and in situ carbonization processes. The Cr 7 C 3 and Cr 2 AlC with similar homogeneous nodular structure have been further in situ electrochemically converted into porous CDC materials. The as-prepared CDCs with amorphous and graphitic structures are hierarchical meso-/ macroporous carbon materials. Besides, the CDCs as an anode for lithium ion batteries were evaluated for their electrochemical performance. The results show that the discharge capacity of Cr 2 AlC-CDC can stay at 248 mAh g −1 after 100 cycles at 100 mA g −1 , demonstrating stable cyclic performance. The molten-salt electrochemical reduction−etching process provides a new method for synthesizing various CDC materials.

Ti3AlC2 is electrochemically synthesized from titanium‐rich slag/Al2O3/C mixtures in molten salts. The intermediate products are systematically analyzed to investigate the formation process of Ti3AlC2. The results show that the synthesis process typically involves an electrodeoxidation process and in situ carburization/combination process. In addition, most of the undesired metallic oxides contained in the titanium‐rich slag are removed effectively during the electrolysis process, and the removal mechanism of these undesired metallic oxides is further discussed. The influences of different molten salts (including molten CaCl2 and CaCl2–NaCl) and temperatures (range of 800–1000 °C) on the final products are also studied. The results show that these electrosynthesis conditions influence the morphology and phase composition of the products. The synthesized Ti3AlC2 particles possess an irregular plate‐like morphology. It is suggested that the molten salt electrochemical synthesis technology is a promising process to produce Ti3AlC2 and/or other MAX phases from multicomponent complex ores.