TY  - JOUR
AU  - Wang, Yuchen
AU  - Liu, Yaoyu
AU  - Chen, Zuo
AU  - Zhang, Man
AU  - Liu, Biying
AU  - Xu, Zhenhao
AU  - Yan, Kai
PY  - 2022
TI  - In situ growth of hydrophilic nickel-cobalt layered double hydroxides nanosheets on biomass waste-derived porous carbon for high-performance hybrid supercapacitors
JO  - Green Chemical Engineering
SN  - 2096-9147
SP  - 55
EP  - 63
VL  - 3
IS  - 1
AB  - Rational design and cost-effective fabrication of layered double hydroxides (LDHs) nanosheets with extraordinary electrochemical performance is a key challenge for hybrid supercapacitors (HSCs). Herein, we report a facile in situ growth methodology to eco-friendly synthesize hydrophilic NiCo-LDHs nanosheets on biomass waste-derived porous carbon (BC) for robust high-performance HSC cathode. The in situ growth process under ultrasonication realizes the rational arrangement of NiCo-LDHs nanosheets on the surface of BC, which effectively increases the specific surface area, promotes the electronic conductivity and enhances the wettability of NiCo-LDHs nanosheets without affecting their thickness values. With the beneficial effects of ultrathin thickness of LDHs nanosheets (6.20 nm), large specific surface area (2324.1 m2 g−1), low charge transfer resistance (1.65 Ω), and high wettability with electrolyte (34°–35°), the obtained Ni2Co1-LDHs/BC50 electrode possesses an ultra-high specific capacitance of 2390 F g−1 (956 C g−1) at 1 A g−1, which is superior to most reported values. Furthermore, an assembled Ni2Co1-LDHs/BC50//YP-80F HSC delivers a maximum specific energy of 52.47 Wh kg−1 at 375 W kg−1, and maintains a high capacitance retention of 75.9% even after 4000 cycles. This work provides a facile approach to fabricate LDHs nanosheets based cathode materials for high-performance HSCs.
UR  - https://doi.org/10.1016/j.gce.2021.09.001
DO  - 10.1016/j.gce.2021.09.001