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Size‐Related Electrochemical Performance in Active Carbon Nanostructures: A MOFs‐Derived Carbons Case Study

機(jī)譯：活性炭納米結(jié)構(gòu)中尺寸相關(guān)的電化學(xué)性能：MOFs衍生碳的案例研究

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Metal–organic framework–derived carbon nanostructures have generated significant interest in electrochemical capacitors and oxygen/hydrogen catalysis reactions. However, they appear to show considerably varied structural properties, and thus exhibit complex electrochemical–activity relationships. Herein, a series of carbon polyhedrons of different sizes, between 50 nm and µm, are synthesized from zeolitic imidazolate frameworks, ZIF‐8 (ZIF‐derived carbon polyhedrons, ZDCPs) and their activity is studied for capacitance and the oxygen reduction reaction (ORR). Interestingly, a well‐correlated performance relationship with respect to the particle size of ZDCPs is evidenced. Here, the identical structural features, such as specific surface area (SSA), microporosity, and its distribution, nitrogen doping, and graphitization are all strictly maintained in the ZDCPs, thus allowing identification of the effect of particle size on electrochemical performance. Supercapacitors show a capacity enhancement of 50 F g−1 when the ZDCPs size is reduced from micrometers to ≤200 nm. The carbonization further shows a considerable effect on rate capacitance—ZDCPs of increased particle size lead to drastically reduced charge transportability and thus inhibit their performance for both the charge storage and the ORR. Guidelines for the capacitance variation with respect to the particle size and SSA in such carbon nanostructures from literature are presented.
機(jī)譯：金屬-有機(jī)框架衍生的碳納米結(jié)構(gòu)引起了電化學(xué)電容器和氧/氫催化反應(yīng)的極大興趣。然而，它們似乎顯示出相當(dāng)大的結(jié)構(gòu)特性，因此表現(xiàn)出復(fù)雜的電化學(xué)-活性關(guān)系。本文中，從沸石咪唑酸鹽骨架ZIF-8（ZIF衍生的碳多面體，ZDCPs）合成了一系列大小在50nm至μm之間的不同尺寸的碳多面體，并研究了它們的電容量和氧還原反應(yīng)（ORR） ）。有趣的是，ZDCPs的粒徑之間存在良好相關(guān)的性能關(guān)系。在此，ZDCP中嚴(yán)格保留了相同的結(jié)構(gòu)特征，例如比表面積（SSA），微孔率及其分布，氮摻雜和石墨化，因此可以確定粒度對(duì)電化學(xué)性能的影響。當(dāng)ZDCPs尺寸從微米減小到≤200nm時(shí)，超級(jí)電容器的容量提高了50 F g -1 。碳化進(jìn)一步顯示出對(duì)速率電容的顯著影響-粒徑增加的ZDCP導(dǎo)致電荷傳輸能力大大降低，因此抑制了其在電荷存儲(chǔ)和ORR方面的性能。從文獻(xiàn)中提出了在這樣的碳納米結(jié)構(gòu)中關(guān)于粒徑和SSA的電容變化的指南。

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