Abstract

Seaweed blooms have become a serious worldwide environmental, economic and social problem. Reducing the cost of electrodes for electrochemical generation/storage systems is crucial for its commercialization. Ascophyllum nodosum grows abundantly in northern oceans, in this study, we evaluate A. nodosum derived chemically activated biocarbon (AKPH) with potassium hydroxide (KOH) as electrode material for oxygen reduction reaction and supercapacitors. Physical–chemical, morphological and electrochemical characterizations were performed. SEM micrographs revealed the morphology changes in AKPH due to KOH activation. AKPH nitrogen and sulfur contents were 0.80 and 5.62 (wt.%), respectively and it exhibited 1493 m² g⁻¹ surface area with an I_D/I_G intensity ratio of 1.34 ± 0.01. The electrochemical performance indicates a good performance when compared to commercial platinum, with an onset and half-wave potential of 0.878 and 0.75 V vs. RHE, respectively; and a current density of 5.2 mA cm⁻². AKPH exhibited a capacitance of 207.3 F g⁻¹ at 0.5 A g⁻¹ and good stability after 2500 cycles at 5 A g⁻¹ with a retention capability of 92.3%. This performance turns seaweed in a promising way to synthesize materials for applications in energy conversion and storage field.

中文翻译：

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海藻衍生的KOH活化生物碳，用于电催化氧还原和超级电容器应用

摘要

海藻开花已成为全球范围内严重的环境，经济和社会问题。降低用于电化学发电/存储系统的电极的成本对其商业化至关重要。结节藻在北部海洋中大量生长，在这项研究中，我们评估了结节霉衍生的化学活化生物碳（AKPH），其中氢氧化钾（KOH）作为电极进行氧还原反应和超级电容器。进行了物理化学，形态学和电化学表征。SEM显微照片揭示了由于KOH活化导致的AKPH的形态变化。AKPH的氮和硫含量分别为0.80和5.62（wt。％），显示出1493 m ²  g ^-1I _D / I _G强度比为1.34±0.01的表面积。与商用铂相比，电化学性能显示出良好的性能，相对于RHE的起始和半波电势分别为0.878和0.75V。电流密度为5.2 mA cm ^-2。AKPH在0.5 A g ^-1时表现出207.3 F g ^-1的电容，在5 A g ^-1时经过2500次循环后具有良好的稳定性，保持能力为92.3％。这种性能使海藻以一种很有前途的方式合成了用于能量转换和存储领域的材料。