▎ 摘　　要

Graphene film has a great planar electron transport characteristic, yet its vertical electron transport efficiency is limited due to the two-dimensional stacked structure, which restricts the wide implementation of graphenebased films in energy storage field, such as supercapacitors (SCs). Herein, we present a novel folding strategy to tackle this issue and enable preparation of high mass loading graphene film possessing high-performance. Folded reduced graphene oxide (F-rGO) films via low-temperature thermal reduction show the folded paperlike structure and an interesting electrochemical law. Briefly, by combining the capacitance performance of different fold films, the resulting films exhibit a capacitance retention behavior of similar "relay race", rendering that their gravimetric capacitance always maintain high level value (>180 F g(-1)) at the range of 2-9 mg cm(-2), and the volumetric capacitance can achieve similar to 232 F cm(-3) even at 11.3 mg cm(-2). Meanwhile, their areal capacitance also exhibits a relay-like and linear growth with increasing mass loading and eventually achieve similar to 3400 mF cm(-2) at 17 mg cm(-2). In addition, flexible all-solid state SCs assembled by the F-rGO films also present excellent electrochemical and structural stability under bending states. Therefore, we believe that folding technique is a meaningful way to produce high-performance graphene based electrodes.