Highly Crystallized Cubic Cattierite CoS2 for Electrochemically Hydrogen Evolution over Wide pH Range from 0 to 14
Highly Crystallized Cubic Cattierite CoS2 for Electrochemically Hydrogen Evolution over Wide pH Range from 0 to 14
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DOI：
10.1016/j.electacta.2014.09.164
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发表时间：
2014-12
影响因子：
6.6
通讯作者：
Haichuan Zhang;Yingjie Li;Guoxin Zhang;Pengbo Wan;Tianhao Xu;Xiaochao Wu;Xiaoming Sun
中科院分区：
文献类型：
--
作者：
Haichuan Zhang;Yingjie Li;Guoxin Zhang;Pengbo Wan;Tianhao Xu;Xiaochao Wu;Xiaoming Sun
以CoCl 2和硫脲为前驱体，采用简单的水热法在Ti箔上制备了高度结晶的立方立方菱锰矿CoS 2金字塔。扫描电子显微镜（SEM）表征揭示了从随机纳米粒子的形态演变与明确的小平面的微金字塔。这些CoS 2金字塔作为电催化剂的析氢反应（HER），并显示出非常不同的酸性HER性能。反应时间为15 h时制备的样品表现出最好的性能，起始过电位低至81 mV，Tafel斜率为1.72 mV/dec。即使在30，000 s后，活性仍保持近89%。进一步的研究表明，这些CoS 2金字塔在中性（1.0 M磷酸钾缓冲溶液，pH = 7.00）和碱性（1.0 M KOH溶液，pH = 13.57）条件下也能很好地发挥作用。立方型催化剂CoS 2可在0 ~ 14的较宽pH范围内作为一种新型的HER电催化剂，且具有合成简单、成本低、稳定性高等优点，有望成为一种具有实用价值的HER电催化剂。
Highly-crystallized cubic cattierite CoS2pyramids were deposited on Ti foil via a simple hydrothermal method using CoCl2and thiourea as precursors. Scanning electron microscopy (SEM) characterization revealed the morphology evolution from ramdom nanoparticles to micro-pyramids with well defined facets. These CoS2pyramids were applied as electrocatalysts for hydorgen evolution reaction (HER) and showed very different acidic HER performance. The sample prepared at 15 h reaction time showed the best performance with an onset overpotential as low as 81 mV and a Tafel slope of ∼72 mV/dec. The activity was kept almost 89% even after working for 30,000 seconds. Further study showed that these CoS2pyramids also functioned well in neutral (1.0 M potassium phosphate buffer solution, pH = 7.00) and alkaline (1.0 M KOH solution, pH = 13.57) conditions. The cubic cattierite-type CoS2can work as a novel HER electrocatalyst over the wide pH range from 0 to 14, combined with its easy-synthesis, low-cost and high stability, which can potentially serve as a ready-to-go HER catalyst for practical utilization.