Template carbon (TC) is one of the most promising electrode materials for clean-energy devices (e.g., supercapacitors), but its application is hampered by the high cost of templates and carbon sources. Here, we report a green MgO template recycling technology that converts CO₂ to high specific-surface-area TC by establishing a zero-emission chemical cycle at one-third the cost of nonrecycling methods. Up to 10 cycles of recycling demonstrate that the template’s dissolution and regeneration, as well as TC’s pore structure and physical properties, are extremely repeatable. Supercapacitors using symmetric TC electrodes deliver high-capacitance and -rate performances either in aqueous (KOH/H₂O, >154 F g^–1) or organic (Et₄NBF₄/AN, >140 F g^–1) and ionic liquid (EMIMBF₄, >178 F g^–1) electrolytes, and ≈100% Coulomb efficiency, outperforming traditional commercial supercapacitors. This progress greatly reduces the cost of large-scale use of TC in supercapacitors and creates a sustainable link between CO₂ reduction and clean-energy development.

中文翻译：

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通过建立零排放的 CO2 化学循环，消除高性能超级电容器模板碳合成的成本障碍

模板碳（TC）是清洁能源设备（例如超级电容器）最有前途的电极材料之一，但其应用受到模板和碳源成本高的阻碍。在这里，我们报告了一种绿色 MgO 模板回收技术，该技术通过以非回收方法三分之一的成本建立零排放化学循环，将 CO _{2转化为高比表面积的 TC。}多达 10 个循环的循环表明，模板的溶解和再生，以及 TC 的孔结构和物理性质具有极高的可重复性。_{使用对称 TC 电极的超级电容器在水溶液（KOH/H 2} O，>154 F g ^–1）或有机物（Et ₄ NBF ）中提供高容量和倍率性能₄ /AN, >140 F g ^–1 ) 和离子液体 (EMIMBF ₄ , >178 F g ^–1 ) 电解质，以及 ≈100% 库仑效率，优于传统商业超级电容器。这一进展大大降低了在超级电容器中大规模使用 TC 的成本，并在 CO ₂减排和清洁能源开发之间建立了可持续的联系。