Direct Assembly of 3D-BCN Microspheres as a Microsupercapacitor Electrode for Wearable Energy Storage

Abstract

Scalable and cost-effective fabrication of threedimensional (3D) boron carbon nitride (BCN) microspheres was first demonstrated by hydrothermal and annealing methods. In particular, the specific surface area of 3D-BCN-4 reached 1390.12 m 2 g −1 and had a high hierarchical pore structure. An all-printed solid-state flexible microsupercapacitor (MSC) based on 3D-BCN-4 microspheres as an electrode material was fabricated for the first time by a screen printing method, which also provided efficacious properties. The single MSC areal capacitance reached 41.6 mF cm −2 . Furthermore, the remarkable mechanical flexibility was also achieved for the device with evidence that no obvious capacitance loss occurred even upon bending to 180°, and the device had a 93.3% capacitance retention after 1000 cycles. In addition, the maximum energy density reached 0.00832 mW h cm −2 , and the highest power density was 2 mW cm −2 . These results show the synthesis of 3D-BCN by a facile and effective method with excellent electrochemical performance, which should provide a promising direction to wearable energy storage devices.

Ethanol‐Induced Ni2+‐Intercalated Cobalt Organic Frameworks on Vanadium Pentoxide for Synergistically Enhancing the Performance of 3D‐Printed Micro‐Supercapacitors

“…Notably, the as-developed 3D-printed MSCs exhibit better performance than previously reported MSCs. [63][64][65][66][67] The outstanding performance of 3D-printed MSCs can be attributed to the large mass load, wide voltage window (1.4 V), and active material with a large capacitance. Additionally, the large number of open macropores in the 3D-printed electrode can form channels to promote the transport of particles and charges in the electrolyte.…”

Discriminating Active BN Sites in Coralloidal B, N Dual‐Doped Carbon Nano‐Bundles for Boosted Zn‐Ion Storage Capability

“…C bond. [25] Compared to the BC and NC electrodes, the BNC features two distinct characteristic peaks at 786 and 1392 cm −1 , which are assigned to the BNB and BN bonds, respectively. [26] The wide peak ≈1071 cm −1 is derived from the CO, CB, and NBO bonds.…”

“…As illustrated in Figure 3c, the wide valley at 1618 cm −1 that appears in the FT‐IR spectra is belong to the C≐C bond. [ 25 ] Compared to the BC and NC electrodes, the BNC features two distinct characteristic peaks at 786 and 1392 cm −1 , which are assigned to the BNB and BN bonds, respectively. [ 26 ] The wide peak ≈1071 cm −1 is derived from the CO, CB, and NBO bonds.…”

A Review of Fabrication Technologies for Carbon Electrode-Based Micro-Supercapacitors

“…Then, the screen-printed active material was covered by dropping polyvinyl alcohol/potassium hydroxide gel electrolyte onto it, and finally, this was stabilized by a PDMS passivation layer. A screen printing method was also applied to make solid-state flexible micro-supercapacitors with 3D boron carbon nitride microspheres (made via hydrothermal and annealing techniques), with an areal capacitance of 41.6 mF/cm 2 [195]. A simple fabrication process with screen printing was also employed to make solid-state integrated micro-supercapacitor arrays with porous activated biochar (Figure 13), which exhibited an areal capacitance of 116 mF/cm 2 and a high areal energy density of 9.3 µWh/cm 2 [196].…”