▎ 摘　　要

NOVELTY - Preparing a carbon nanomaterial (CNM) product involves heating an electrolyte media to obtain a molten electrolyte media, positioning the molten electrolyte media between a high-nickel content anode and a cathode of an electrolytic cell, and introducing a source of carbon into the electrolytic cell. An electric current is applied to the cathode and the anode in the electrolytic cell. The CNM product is collected from the cathode, where the CNM product comprises a minimal relative-amount of 70 wt.%, as compared to the total weight of the CNM product, of a desired allotrope selected from a group of a carbon nanotube (CNT) of a desired length, a curled CNT, conical carbon nanofiber, a nano-bamboo, a hollow nano-onion and a nano-tree. USE - Method for preparing carbon nanomaterial product for a medical device, a structural enhancement additive, a strength enhancement additive, an electrical conductivity enhancement additive, a thermal conductivity enhancement additive, or a flexibility enhancement additive (claimed). ADVANTAGE - The method employ a consumable carbon dioxide (CO2) and a renewable carbonate electrolyte as reactants in an electrolysis reaction in order to make carbon nanotubes (CNTs). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. a carbon nanomaterial comprises nano-bamboo, where the nano-bamboo comprises multiple graphene layers positioned between pairs of bamboo knobs; and 2. use of a desired nano-carbon allotrope in one or more of a medical device, a structural enhancement additive, a strength enhancement additive, an electrical conductivity enhancement additive, a thermal conductivity enhancement additive, or a flexibility enhancement additive, a hardness enhancement additive, a durability enhancement additive, a lubrication enhancement additive, or as a catalyst, electric vehicles, cables or wires, athletic equipment, a pharmaceutical drug delivery system, an electronic, a battery, a super capacitor, a sensor, a plastic, a polymer, a textile, a hydrogen storage system, a light absorbing enhancement for a surface, an electromagnetic shielding enhancement for a surface, and a surface treatment, where desired allotrope is carbon nanotube (CNT) of a desired length, a curled CNT, conical carbon nanofiber, a nano-bamboo, a hollow nano-onion or a nano-tree.