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用于能量转换和存储应用的高活性二维层状 MoS2-rGO 杂化材料。

Highly Active 2D Layered MoS -rGO Hybrids for Energy Conversion and Storage Applications.

机构信息

CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751013, India.

Academy of Scientific & Innovative Research, New Delhi, 110001, India.

出版信息

Sci Rep. 2017 Aug 21;7(1):8378. doi: 10.1038/s41598-017-08677-5.

DOI:10.1038/s41598-017-08677-5
PMID:28827746
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5566394/
Abstract

The development of efficient materials for the generation and storage of renewable energy is now an urgent task for future energy demand. In this report, molybdenum disulphide hollow sphere (MoS-HS) and its reduced graphene oxide hybrid (rGO/MoS-S) have been synthesized and explored for energy generation and storage applications. The surface morphology, crystallinity and elemental composition of the as-synthesized materials have been thoroughly analysed. Inspired by the fascinating morphology of the MoS-HS and rGO/MoS-S materials, the electrochemical performance towards hydrogen evolution and supercapacitor has been demonstrated. The rGO/MoS-S shows enhanced gravimetric capacitance values (318 ± 14 Fg) with higher specific energy/power outputs (44.1 ± 2.1 Whkg and 159.16 ± 7.0 Wkg) and better cyclic performances (82 ± 0.95% even after 5000 cycles). Further, a prototype of the supercapacitor in a coin cell configuration has been fabricated and demonstrated towards powering a LED. The unique balance of exposed edge site and electrical conductivity of rGO/MoS-S shows remarkably superior HER performances with lower onset over potential (0.16 ± 0.05 V), lower Tafel slope (75 ± 4 mVdec), higher exchange current density (0.072 ± 0.023 mAcm) and higher TOF (1.47 ± 0.085 s) values. The dual performance of the rGO/MoS-S substantiates the promising application for hydrogen generation and supercapacitor application of interest.

摘要

高效材料的开发对于可再生能源的产生和存储是未来能源需求的当务之急。在本报告中，合成了二硫化钼空心球（MoS-HS）及其还原氧化石墨烯杂化物（rGO/MoS-S），并探索了它们在能源产生和存储方面的应用。对合成材料的表面形貌、结晶度和元素组成进行了彻底分析。受 MoS-HS 和 rGO/MoS-S 材料迷人形态的启发，对其进行了析氢和超级电容器的电化学性能研究。rGO/MoS-S 表现出增强的重量电容值（318 ± 14 Fg），具有更高的比能量/功率输出（44.1 ± 2.1 Whkg 和 159.16 ± 7.0 Wkg）和更好的循环性能（即使经过 5000 次循环后，仍保持 82 ± 0.95%的电容保持率）。此外，还构建了基于 coin 型电池结构的超级电容器原型，并展示了其为 LED 供电的能力。rGO/MoS-S 具有暴露边缘位点和导电性的独特平衡，表现出卓越的 HER 性能，具有更低的起始过电势（0.16 ± 0.05 V）、更低的塔菲尔斜率（75 ± 4 mVdec）、更高的交换电流密度（0.072 ± 0.023 mAcm）和更高的 TOF（1.47 ± 0.085 s）值。rGO/MoS-S 的双重性能证实了其在制氢和超级电容器应用方面的应用前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/ee47585aac96/41598_2017_8677_Fig8_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/0bebaa0efde6/41598_2017_8677_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/efc6e07917e8/41598_2017_8677_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/ee47585aac96/41598_2017_8677_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/a84bd6fabedc/41598_2017_8677_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/e6729886283c/41598_2017_8677_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/691a49577c2c/41598_2017_8677_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/e7acee9ae44e/41598_2017_8677_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/611f3a95a311/41598_2017_8677_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/0bebaa0efde6/41598_2017_8677_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/efc6e07917e8/41598_2017_8677_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fc3a/5566394/ee47585aac96/41598_2017_8677_Fig8_HTML.jpg

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