The layered double hydroxides (LDHs) are well known for ionic exchange properties to intercalate anionic compound in interlayer region. The Ni/V LDH composite was explored by co-precipitation method. The maximum capacitance of Ni/V LDH composite was 2612 F g-1 at the scan rate 2 mV s -1. As-synthesized Ni/V LDH composite provides a three-dimensional conducting network frame for manifesting electrochemical capacitance. This is because the insertion of vanadium oxide anions (VOx -) into nickel interlayer space between nickel layers is compensated for hydroxyl vacancies during synthesis of lower-pH condition. The network frame makes it possible to promote fast electron transfer for Ni/V LDH composite electrode material and consequently allows the improvement of the electronic conductivity for Ni/V LDH composite electrode material. Thus, the Ni/V LDH composite exhibits high capacitance than β-Ni(OH)2 due to its unique properties, with vanadium oxide anions embedded in the turbostratic structure and shorter diffusion pathway.
Bibliographical noteFunding Information:
This research was supported by the Converging Research Center Program through the Ministry of Education, Science and Technology (2012K001257).
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry