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KOH activation of coal-derived microporous carbons for oxygen reduction and supercapacitors

机译：氧化煤衍生的微孔碳的激活，用于氧还原和超级电容器

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Due to the dilemma of rapid consumption of fossil fuels and environmental pollution, development of clean, efficient and renewable energy conversion and storage technology has become an urgent need. Supercapacitors and hydrogen–oxygen fuel cells as typical representatives have become the focus of scientific research, in which the electrode materials are of much importance to their improved activity. In this work, a series of porous carbons (PCs) with high specific surface areas were prepared using natural coals as carbon precursors coupled with KOH activation. The effects of the mass ratio of coal and KOH as well as different activation temperatures on the microstructures of the PCs and electrochemical properties were studied in detail. The optimal PC4 (KOH: coal = 4) possessed a high specific surface area (SSA) of 2092 m ~(2) g ~(?1) and a well-developed microporous structure. As the electrocatalyst, it exhibited a positive onset potential of 0.88 V ( vs. reversible hydrogen electrode (RHE)) and half-wave potential of 0.78 V ( vs. RHE) towards the oxygen reduction reaction (ORR) in an alkaline solution. PC4 also showed the highest specific capacitance of 128 F g ~(?1) at a current density of 0.5 A g ~(?1) among all the samples in this work. The relatively good performance of PC4 resulted from its well-developed microporous structure and large SSA, enabling fast mass transfer of electrolytes.
机译：由于化石燃料快速消耗的困境和环境污染，清洁，高效和可再生能源转换和储存技术的发展已成为迫切需要的。随着典型代表的超级电容器和氢氧燃料电池已成为科学研究的重点，其中电极材料对其改善的活性很重要。在这项工作中，使用天然煤制备一系列具有高比表面积的多孔碳（PC）作为碳前体，与KOH活化相结合。研究了煤和KOH质量比以及不同活化温度对PC和电化学性能的不同的影响。最佳PC4（KOH：煤= 4）具有2092m〜（2）G〜（α1）和发育良好的微孔结构的高比表面积（SSA）。作为电催化剂，它表现出0.88V（Vs.可逆氢电极（RHE））的正发作电位和朝向碱性溶液中的氧还原反应（ORR）的0.78V（rhe）的半波电位。 PC4还在本工作中的所有样品中以0.5Ag〜（α1）的电流密度为128f g〜（α1）的最高比电容。 PC4的相对良好的性能由其开发的微孔结构和大型SSA产生的，使电解质的快速传递。

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