Three-dimensional reduced graphene oxide/carbon nanotube nanocomposites anchoring of amorphous and crystalline molybdenum sulfide: Physicochemical characteristics and electrocatalytic hydrogen evolution performances
Three-dimensional reduced graphene oxide/carbon nanotube nanocomposites anchoring of amorphous and crystalline molybdenum sulfide: Physicochemical characteristics and electrocatalytic hydrogen evolution performances
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DOI：
10.1016/j.electacta.2018.04.078
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发表时间：
2018-05
影响因子：
6.6
通讯作者：
Yali Guo;Rui Wang;Xing Xu;Ya-nan Shang;Baoyu Gao
中科院分区：
文献类型：
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作者：
Yali Guo;Rui Wang;Xing Xu;Ya-nan Shang;Baoyu Gao
将三维（3D）还原的氧化石墨烯/碳纳米管纳米复合材料（rGO/CNT纳米复合材料）和还原的氧化石墨烯纳米复合材料（rGO纳米复合材料）用无定形MoSx锚定，形成MoSx-rGO/CNT和MoSx-rGO纳米复合材料。对它们的析氢反应活性进行了深入的评价。结果表明，rGO/CNTs纳米复合材料比CNTs纳米复合材料提供了更多的非晶态MoSx的位置。MoSx-rGO和MoSx-rGO/CNTs纳米复合材料的拉曼光谱证实了MoSxin所有MoSx锚定的纳米复合材料的非晶态。TEM和SEM形貌表明，非晶态MoSx在rGO/CNTs和rGO纳米复合材料上分散良好。MoSx-rGO/CNTs和MoSx-rGO纳米复合材料中的非晶态MoSx纳米颗粒可以在其边缘提供更多的S原子，从而大大提高HER活性。HER性能表明，以晶态MoS 2为锚定物的rGO/CNTs和rGO纳米复合材料表现出较差的HER性能。相比之下，MoSx-rGO/CNT和用少量MoSx锚定的MoSx-rGO纳米复合材料表现出优异的HER活性（在10 mA cm−2下的过电位为179 mV）。结果还表明，MoSx-rGO纳米复合材料的HER活性略小于MoSx-rGO/CNTs纳米复合材料。rGO/CNTs纳米复合材料中的CNTs能改善电解质/电极的紧密接触，促进高速率的电荷转移，进一步增强其电催化析氢性能。
The three-dimensional (3D) reduced graphene oxide/carbon nanotube nanocomposites (rGO/CNTs nanocomposites) and reduced graphene oxide nanocomposites (rGO nanocomposites) were anchored with amorphous MoSx, forming the MoSx-rGO/CNTs and MoSx-rGO nanocomposites. Their hydrogen evolution reaction (HER) activities were intensively evaluated. Results indicated that the rGO/CNTs nanocomposite provided more sites for the amorphous MoSx as compared with that of CNTs nanocomposite. Raman spectra of MoSx-rGO and MoSx-rGO/CNTs nanocomposites confirmed the amorphous state of MoSxin all MoSxanchored nanocomposites. TEM and SEM morphology indicated that the amorphous MoSxwas well-dispersed on the rGO/CNTs and rGO nanocomposites. The amorphous MoSxnanoparticles in MoSx-rGO/CNTs and MoSx-rGO nanocomposites could provide more S atoms at their edges, and therefore greatly improve the HER activity. HER performances indicated that the rGO/CNTs and rGO nanocomposites anchored with crystalline MoS2exhibited poor HER performance. In contrast, MoSx-rGO/CNTs and MoSx-rGO nanocomposites anchored with a small amount of MoSxexhibited the excellent HER activity (179 mV of overpotential at 10 mA cm−2). Results also indicated that the HER activities of the MoSx-@rGO nanocomposites were a bit smaller than those of MoSx-rGO/CNTs nanocomposites. The CNTs in the rGO/CNTs nanocomposites would improve the intimate electrolyte/electrode contact and promote the high-rate charge transfer, which further strengthened their electrocatalytic hydrogen evolution performances.