Recently, due to high theoretical capacitance and excellent ion diffusion rate caused by the 2D layered crystal structure, transition metal hydroxides (TMHs) have generated considerable attention as active materials in supercapacitors (or electrochemical capacitors). However, TMHs should be designed using morphological or structural modification if they are to be used as active materials in supercapacitors, because they have insulation properties that induce low charge transfer rate. This study aims to modify the morphological structure for high cycling stability and fast charge storage kinetics of TMHs through the use of nickel cobalt hydroxide [NiCo(OH)2] decorated on nickel foam. Among the samples used, needle-like NiCo(OH)2 decorated on nickel foam offers a high specific capacitance (1110.9 F/g at current density of 0.5 A/g) with good rate capability (1110.9 - 746.7 F/g at current densities of 0.5 - 10.0 A/g). Moreover, at a high current density (10.0 A/g), a remarkable capacitance (713.8 F/g) and capacitance retention of 95.6% after 5000 cycles are noted. These results are attributed to high charge storage sites of needle-like NiCo(OH)2 and uniformly grown NiCo(OH)2 on nickel foam surface.

1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
References

• 신동요(한국생산기술연구원 접합적층연구부문) | Dong-Yo Shin (Advanced Joining and Additive Manufacturing R&D Department, Korea Institute of Industrial Technology, 113–58 Seohaean-ro, Siheung-si, Gyeonggi-do 15014, Republic of Korea)
• 윤종천(한국생산기술연구원 접합적층연구부문) | Jongcheon Yoon (Advanced Joining and Additive Manufacturing R&D Department, Korea Institute of Industrial Technology, 113–58 Seohaean-ro, Siheung-si, Gyeonggi-do 15014, Republic of Korea)
• 하철우(한국생산기술연구원 접합적층연구부문) | Cheol Woo Ha (Advanced Joining and Additive Manufacturing R&D Department, Korea Institute of Industrial Technology, 113–58 Seohaean-ro, Siheung-si, Gyeonggi-do 15014, Republic of Korea) Corresponding author