With the advent of the post–lithium-ion era, sodium- and potassium-
based energy storage devices are intensively focused
in the recent years. The novel sodium- and potassium-ion
hybrid capacitors couple with the merits of supercapacitors
and secondary batteries and thus are widely explored. A
typical hybrid capacitor is generally constructed by combining
a battery-type anode and a capacitive-type cathode, which
presents both high energy density and power features. The
design and fabrication of anode materials with high rate
capability and long life to match the capacitive cathode is a
critical issue. In this short review, the newly developed anode
materials in nonaqueous capacitors are systematically
analyzed. Based on a comprehensive summarization, the
challenges for further practical applications of anode materials
are prospected.