皱褶表面介孔镍钴硫化物微球的制备及其超电性能

doi:10.11944/j.issn.1000-0518.2015.12.150181

摘要/Abstract

摘要：

通过一步水热法分别合成了α-NiS、Co₃S₄和CoNi₂S₄纳米介孔电极材料,并研究了其电化学性能。 X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)研究表明,介孔硫化物是由单相纳米颗粒堆叠组装而成,其中二元系的CoNi₂S₄由纳米片自组装形成了具有皱褶表面的微球形貌。电化学性能研究表明,二元系的CoNi₂S₄比α-NiS、Co₃S₄具有更高的比电容、更佳的倍率特性和优异的循环稳定性。在扫描速率为5 mV/s时,CoNi₂S₄材料在6 mol/L KOH电解液中比电容高达1678.3 F/g,优于α-NiS (787.4 F/g)和Co₃S₄(1532.7 F/g),在扫描速率从5 mV/s增加到100 mV/s时,其电容保持率为45.8%,比α-NiS(30.2%)和Co₃S₄(29.3%)高出约15%。在15A/g的电流密度下,经过900次循环充-放电后,二元系的CoNi₂S₄的电容仍保持在96.3%,库伦效率保持在94.3%左右,说明镍钴双金属硫化物具有优异的循环稳定性能和充放电可逆性。

关键词: 镍钴金属硫化物, 超级电容器, 皱褶状微球, 水热法, 介孔电极材料

Abstract:

Mesoporous α-NiS, Co₃S₄ and CoNi₂S₄ electrode materials were synthesized by a simple one-step hydrothermal method, and their electrochemical properties were investigated. X-ray diffraction and electron microscopy results show that as-obtained mesoporous sulfide electrode materials are assembled by single-phase sulfide nanoparticles and the CoNi₂S₄ electrode materials have the unique structure of ruffle-like microspheres consisting of 2D nanoplates. The binary CoNi₂S₄ electrode exhibits much higher specific capacitance of 1678.3 F/g than that of either Co₃S₄(1532.7 F/g) or α-NiS(787.4 F/g) in 6 mol/L KOH at a scan rate of 5 mV/s, and shows excellent capability retention of 45.8% from 5 mV/s to 100 mV/s, which is ~15% higher than that of α-NiS and Co₃S₄. The excellent cycling stability of binary CoNi₂S₄ electrode is achieved with 96.3% of the initial capacitance over 900 consecutive cycles at 15 A/g. Moreover, the columbic efficiency consistently remains above 94.3% within 900 cycles. The fine specific capacitance and good cycling stability demonstrate that the mesoporous CoNi₂S₄ electrode has potential applications in supercapacitors.

Key words: nickel and cobalt metal sulfide, supercapacitor, rufflelike microsphere, hydrothermal, mesoporous electrode material

尤春琴, 罗民, 阚夏梅, 付蓉蓉, 梁斌. 皱褶表面介孔镍钴硫化物微球的制备及其超电性能[J]. 应用化学, 2015, 32(12): 1455-1461.

YOU Chunqin, LUO Min, KAN Xiamei, FU Rongrong, LIANG Bin. One-step Hydrothermal Synthesis of Mesoporous Ruffle-like Sulfide Microspheres for Supercapacitors[J]. Chinese Journal of Applied Chemistry, 2015, 32(12): 1455-1461.

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