A one-step, cost-effective green method to in situ fabricate Ni(OH)₂ hexagonal platelets on Ni foam as binder-free supercapacitor electrode materials

Abstract

PAPER Jinglei Lei et al.A one-step, cost-eff ective green method to in situ fabricate Ni(OH) 2 hexagonal platelets on Ni foam as binder-free supercapacitor electrode materials Nickel hydroxide (Ni(OH) 2 ) is considered to be a promising alternative to the expensive and toxic RuO 2 electrode material for high-performance supercapacitors; however, the fabrication method and electrochemical performance of suitable Ni(OH) 2 structures are unsatisfactory. In the present work, a facile, cost-effective green method is developed to in situ fabricate Ni(OH) 2 hexagonal platelets on Ni foam as a binder-free supercapacitor electrode with high performance. The Ni(OH) 2 hexagonal platelets are self-grown on three-dimensional (3D) Ni foam by a one-step hydrothermal treatment of Ni foam in a 15 wt% H 2 O 2 aqueous solution without the use of nickel salts, acids, bases, or post-treatments. The asprepared Ni(OH) 2 hexagonal platelets-Ni foam (HNF) electrode can be used directly as a supercapacitor electrode material, thereby avoiding the need for binders and conducting agents. The Ni(OH) 2 hexagonal platelets demonstrate high capacitance (2534 F g À1 at a scan rate of 1 mV s À1 ) and excellent cycling stability (97% capacitance retention after 2000 cycles at a scan rate of 50 mV s À1 ). The fabrication method developed here has the significant advantage of low-cost, facile, green, and additive-free processing, and it is therefore a promising route for preparing self-supported metal (hydr)oxide electrodes for high-performance supercapacitors and other energy-storage devices.

A novel Ni@Ni(OH)2 coaxial core-sheath nanowire membrane for electrochemical energy storage electrodes with high volumetric capacity and excellent rate capability

“…The high resolution spectrum of Ni 2p in Fig. 4b shows two major peaks around 855.9 and 873.5 eV with a spin-energy of 17.6 eV, along with two satellite peaks at 861.4 and 879.6 eV, in agreement well with previous reports on amorphous Ni(OH) 2 [13]. In addition, the high resolution spectrum of O 1s was shown in Fig.…”

“…A lot of metal oxides and hydroxides including NiO [8,9], Co 3 O 4 [10], MnO 2 [11], RuO 2 [12], Ni(OH) 2 [13][14][15] and Co(OH) 2 [16] have been used for electrochemical energy storage application these years. Among them, Ni(OH) 2 has drawn considerable attention for its high theoretical capacity, low cost, and environmentally benign nature [17].…”

Facile and scalable fabrication of three-dimensional Cu(OH)2nanoporous nanorods for solid-state supercapacitors

“…Thus hi gher energy density can be realized owing to the increased ca paci tance and widened potential wi ndow (~1.6 V vs. ~1.0 V in aqueous EDLCs ). Recentl y, tra nsition metal oxi des (e.g., MnO 2 , 7-11 Ni Co 2 O 4 , [12][13][14][15] Fe 2 O 3 16 ), hydroxi des (e.g., Ni(OH) 2 , [17][18][19] la yered double hydroxides 20,21 ), sul fides (e.g., Ni Co 2 S 4 , [22][23][24][25] Ni 3 S 2 26 ), a nd conducting pol ymers [27][28][29] ha ve been explored as potential pseudocapa ci ti ve ma terials . Since thei r pseudocapa ci ti ve a cti vi ties rel y on redox rea ctions , charge (electron or electrol yte ion) transport wi thin the bulk of these ma terials is crucial to thei r performances , especiall y when thei r pa rti cle sizes a re not too low.…”

Sr-doped Lanthanum Nickelate Nanofibers for High Energy Density Supercapacitors

“…[12][13][14] Among them, transition metal oxides (TMOs) are considered as ideal electrode materials for supercapacitors as they can provide both a high specific capacitance and a high energy density. [15][16][17] For example, one previous study reported on the synthesis of LaMnO 3 (LMO) with perovskite structure for high energy density supercapacitor particularly. [18] This metal oxide possesses a good pseudocapacitance behavior and stability in aqueous electrolytes for the oxygen-vacancy-mediated redox.…”