2D MoS2 Heterostructures on Epitaxial and Self‐Standing Graphene for Energy Storage: From Growth Mechanism to Application
2D MoS2 Heterostructures on Epitaxial and Self‐Standing Graphene for Energy Storage: From Growth Mechanism to Application
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DOI：
10.1002/admt.202100963
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发表时间：
2021-10
影响因子：
6.8
通讯作者：
Negar Zebardastan;J. Bradford;B. Gupta;J. Lipton‐Duffin;J. Macleod;H. Pham;D. Dubal;K. Ostrikov-K.-Ostrik
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文献类型：
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作者：
Negar Zebardastan;J. Bradford;B. Gupta;J. Lipton‐Duffin;J. Macleod;H. Pham;D. Dubal;K. Ostrikov-K.-Ostrik
层状二硫化钼(MoS_2)晶体与石墨烯的结合为具有定制表面和结构特性的异质结构的发展创造了机会，可用于储能应用。本文采用化学气相沉积法(CVD)在外延和自支撑的纳米多孔石墨烯(NPG)上生长MoS_2，形成了二维异质结构。系统地研究了衬底以及不同的CVD生长参数如温度、硫磺和MoO_3的用量、气体流量等对MoS_2生长的影响。有趣的是，MoS_2的各种结构，如单层三角形岛状、螺旋状、直立片状和不规则堆积的多层MoS_2都被成功地开发出来。用不同的先进表征技术提出了生长机理。检测到在形成任何其他结构之前在表面上形成具有晶界的连续润湿层。作为原理证明，首次将MoS_2/NPG用作钾离子电池负极材料。该电极的比容量为389mAhg−1，循环200次后的稳定性大于98%。多孔结构明显促进了离子的传输，这对离子电池是有利的。这些令人鼓舞的结果为开发用于下一代储能技术的2D材料的分层异质结构提供了新的机会。
Layered molybdenum disulphide (MoS2) crystals in combination with graphene create the opportunity for the development of heterostructures with tailored surface and structural properties for energy storage applications. Herein, 2D heterostructures are developed by growing MoS2 on epitaxial and self‐standing nanoporous graphene (NPG) using chemical vapor deposition (CVD). The effect of substrate as well as different CVD growth parameters such as temperature, amount of sulfur and MoO3 precursors, and argon flow on the growth of MoS2 is systematically investigated. Interestingly, various structures of MoS2 such as monolayer triangular islands, spirals, standing sheets, and irregular stacked multilayered MoS2 are successfully developed. The growth mechanism is proposed using different advanced characterization techniques. The formation of a continuous wetting layer with grain boundaries over the surface prior to formation of any other structures is detected. As a proof of principle, MoS2/NPG is employed for the first time as anode material in potassium ion battery. The electrode delivers a specific capacity of 389 mAh g−1 with over 98% stability after 200 cycles. The porous structures clearly facilitate the ion transport which is beneficial for the ion battery. These encouraging results open new opportunities to develop hierarchical heterostructures of 2D‐materials for next‐generation energy storage technologies.