▎ 摘　　要

Conductive graphene inks have shown a great potential for the manufacturing of high-performance flexible wearable electronics. However, the lack of cost-effective, straightforward, and facile routes to formulate multifunctional graphene aqueous inks with excellent conductivity and high apparent viscosity have greatly limited their applications, particularly in high concentration processing and additive-manufacturing. Here, the high-concentration graphene aqueous inks based on structure controllable, sand-milling exfoliation of raw graphite is reported. Such a route yields 62.8% graphene dispersed in water with a high concentration up to 25.1 mg mL(-1), which can be formulated into aqueous inks with excellent printability. As such, the screen printing of the viscous graphene inks into film-heating devices and micro-supercapacitors (MSCs) is further demonstrated. Due to its excellent conductivity (up to approximate to 870 S cm(-1) after annealing), the graphene film showcases a fast ramping temperature (171.9 degrees C) at 8 V in 75 s in the heating device, and a high areal capacitance (1.36 mF cm(-2)) in the MSCs, respectively. It is thus believed that the mechanical-exfoliated graphene inks hold great promise in scalable production of high-performance printable wearable electronics.