A Flexible Platform Containing Graphene Mesoporous Structure and Carbon Nanotube for Hydrogen Evolution

It is of great significance to design a platform with large surface area and high electrical conductivity for poorly conductive catalyst for hydrogen evolution reaction (HER), such as molybdenum sulfide (MoS(x)), a promising and cost‐effective nonprecious material. Here, the design and preparation of a free‐standing and tunable graphene mesoporous structure/single‐walled carbon nanotube (GMS/SWCNT) hybrid membrane is reported. Amorphous MoS(x) is electrodeposited on this platform through a wet chemical process under mild temperature. For MoS(x)@GMS/SWCNT hybrid electrode with a low catalyst loading of 32 μg cm(−2), the onset potential is near 113 mV versus reversible hydrogen electrode (RHE) and a high current density of ≈71 mA cm(−2) is achieved at 250 mV versus RHE. The excellent HER performance can be attributed to the large surface area for MoS(x) deposition, as well as the efficient electron transport and abundant active sites on the amorphous MoS(x) surface. This novel catalyst is found to outperform most previously reported MoS(x)‐based HER catalysts. Moreover, the flexibility of the electrode facilitates its stable catalytic performance even in extremely distorted states.