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首页> 外文期刊>RSC Advances >Template-free preparation of anthracite-based nitrogen-doped porous carbons for high-performance supercapacitors and efficient electrocatalysts for the oxygen reduction reaction
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Template-free preparation of anthracite-based nitrogen-doped porous carbons for high-performance supercapacitors and efficient electrocatalysts for the oxygen reduction reaction

机译：无模板制备无烟煤基氮掺杂多孔碳，用于高性能超级电容器和用于氧还原反应的高效电催化剂

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摘要

The conversion of coal into high-performance electrochemical energy materials, exemplified by electrodes and electrocatalysts for supercapacitors and fuel cells, is currently crucial to the advancement of high value-added, clean and non-fuel utilization of coal resources. In this work, anthracite-based nitrogen-doped porous carbon (ANPC) materials with well-defined pore architectures and adjustable nitrogen concentrations were prepared without any template: ANPC-1 by a one-step activation/doping process and ANPC-2 by a two-step process. The specific capacitance value of the ANPC-1 materials could attain a maximum of 346.0 F g ~(?1) at the current density of 0.5 A g ~(?1) in 6 M KOH. Supercapacitors composed of the ANPC-1 electrodes were able to achieve high energy densities up to 10.3 W h kg ~(?1) and 20.8 W h kg ~(?1) , together with good charge/discharge stabilities of 95.4% and 91.3% after 5000 cycles, in KOH and Na _(2) SO _(4) aqueous electrolytes, respectively. The ANPC-2 materials are more associated with the oxygen reduction reaction (ORR): one possessed a comparable ORR electrocatalytic activity to the commercial JM Pt/C (20% Pt) catalyst, and, moreover, its onset potential (0.96 V vs. RHE), half-wave potential (0.85 V vs. RHE), catalyst durability (95.9% activity retained after 40?000 s) and methanol tolerance were all superior to the benchmark electrocatalyst. This study provides a feasible route to rational design of coal-based multifunctional materials towards electrochemical energy storage and conversion.
机译：煤炭转化为高性能的电化学能源材料，例如用于超级电容器和燃料电池的电极和电催化剂，对提高煤炭资源的高附加值，清洁和非燃料利用至关重要。在这项工作中，制备了无孔模板，氮浓度可调节的无烟煤基氮掺杂多孔碳（ANPC）材料，没有任何模板：通过一步激活/掺杂工艺的ANPC-1和通过一步活化/掺杂工艺的ANPC-2两步过程。在6 M KOH中，电流密度为0.5 A g〜（？1）时，ANPC-1材料的比电容值最高可达到346.0 F g〜（？1）。由ANPC-1电极组成的超级电容器能够实现高达10.3 W h kg〜（？1）和20.8 W h kg〜（？1）的高能量密度，以及良好的充电/放电稳定性，分别为95.4％和91.3％ 5000次循环后，分别在KOH和Na _（2）SO _（4）水性电解质中。 ANPC-2材料与氧还原反应（ORR）的关联性更高：一种材料具有与市售JM Pt / C（20％Pt）催化剂相当的ORR电催化活性，此外，其起始电势（0.96 V vs. RHE），半波电位（相对于RHE为0.85 V），催化剂耐久性（在40？000 s后保留95.9％的活性）和甲醇耐受性均优于基准电催化剂。该研究为合理设计煤基多功能材料向电化学储能和转化提供了一条可行的途径。

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