Urchin-Like Ni_1/3Co_2/3(CO₃)_1/2(OH)·0.11H₂O for Ultrahigh-Rate Electrochemical Supercapacitors: Structural Evolution from Solid to Hollow

Abstract

Portable electronics and electric or hybrid electric vehicles are developing in the trend of fast charge and long electric mileage, which ask us to design a novel electrode with sufficient electronic and ionic transport channels at the same time. Herein, we fabricate a uniform hollow-urchin-like NiCo(CO)(OH)·0.11HO electrode material through an easy self-generated and resacrificial template method. The one-dimensional chain-like crystal structure unit containing the metallic bonding and the intercalated OH and HO endow this electrode material with abundant electronic and ionic transport channels. The hollow-urchin-like structure built by nanorods contributes to the large electrode-electrolyte contact area ensuring the supply of ions at high current. CNTs are employed to transport electrons between electrode material and current collector. The as-assembled NC-CNT-2//AC supercapacitor device exhibits a high specific capacitance of 108.3 F g at 20 A g, a capacitance retention ratio of 96.2% from 0.2 to 20 A g, and long cycle life. Comprehensive investigations unambiguously highlight that the unique hollow-urchin-like NiCo(CO)(OH)·0.11HO electrode material would be the right candidate for advanced next-generation supercapacitors.

Effects of electrodeposition time on a manganese dioxide supercapacitor

“…[9][10][11] However, PCs depend on the rapid and reversible faradaic reactions that occur on the surface of the electrode material. 12,13 The key to pseudocapacitors is the preparation of electrode materials. Transition metal oxides are commonly used as pseudo-capacitive materials.…”

Construction of NiCo2S4@NiMoO4 Core‐Shell Nanosheet Arrays with Superior Electrochemical Performance for Asymmetric Supercapacitors

“…The diffraction peaks located at 17.5°, 19.9°, 26.7°, 33.8°, 36.5°, 39.5°, 44.6°, 56° and 62.2° can be indexed as the (020), (001), (220), (221), (301), (231), (050), (142) and (450) crystal planes of Co(CO 3 ) 1/2 (OH)⋅0.11H 2 O (JCPDS NO. 48‐0083) . As shown in Figure , the diffraction peaks at 2θ of 16.3°, 26.8°, 31.6°, 38.3°, 47.4°, 50.5° and 55.3° can be well indexed to the (111), (220), (311), (400), (422), (511) and (440) crystal planes of the cubic phase NiCo 2 S 4 (JCPDS card no.…”

Iron phosphide anchored nanoporous carbon as an efficient electrode for supercapacitors and the oxygen reduction reaction

“…The development of new electrode materials plays a vital role in reaching the required performance to promote the commercialization of the two applications mentioned above. [18][19][20][21] Transition metal compounds are an important class of functional electrode materials that have been widely investigated in several energy applications. [22][23][24][25] In an inert atmosphere, transition metals combine with phosphorus chemicals to form transition metal phosphides (TMPs), and these materials have notable potential toward energy storage and electrocatalytic applications due to their advantages of low cost, easy large-scale synthesis, and interesting electrical properties.…”