Synergistic Tuning of Nickel Cobalt Selenide@Nickel Telluride Core–Shell Heteroarchitectures for Boosting Overall Urea Electrooxidation and Electrochemical Supercapattery

Abstract

Herein, we demonstrate the synthesis of bifunctional nickel cobalt selenide@nickel telluride (NixCo12‐xSe@NiTe) core–shell heterostructures via an electrodeposition approach for overall urea electrolysis and supercapacitors. The 3D vertically orientated NiTe dendritic frameworks induce the homogeneous nucleation of 2D NixCo12‐xSe nanosheet arrays along similar crystal directions and bring a strong interfacial binding between the integrated active components. In particular, the optimized Ni6Co6Se@NiTe with an interface coupling effect works in concert to tune the intrinsic activity. It only needs a low overpotential of 1.33 V to yield a current density of 10 mA cm−2 for alkaline urea electrolysis. Meanwhile, the full urea catalysis driven only by Ni6Co6Se@NiTe achieves 10 mA cm−2 at a potential of 1.38 V and can approach a constant level of the current response for 40 h. Besides, the integrated Ni6Co6Se@NiTe electrode delivers an enhanced specific capacity (223 mA h g−1 at 1 A g−1) with a high cycling stability. Consequently, a hybrid asymmetric supercapacitor (HASC) device based on Ni6Co6Se@NiTe exhibits a favorable rate capability and reaches a high energy density of 67.7 Wh kg−1 and a power density of 724.8 W kg−1 with an exceptional capacity retention of 92.4% after sequential 12 000 cycles at 5 A g−1.

Construction of Uniform LiF Coating Layers for Stable High-Voltage LiCoO2 Cathodes in Lithium-Ion Batteries

“…As shown in Figure 3 c, the LCO has almost the same Co 2p spectra as the LCO@LiF, indicating that the coating process has almost no effect on the chemical bonding of Co. Specifically, the Co spectra of LCO and LCO@LiF both have two main peaks relative to Co 2p 3/2 and Co 2p 1/2 [ 37 , 52 , 53 ]. Furthermore, the two main peaks can be deconvoluted into four subpeaks ( Figure S3 ).…”

Morphological control and performance engineering of Co-based materials for supercapacitors

“…Finally, the sample prepared with a deposition time of 1500 s presented outstanding electrochemical performance with a specific capacitance of 2318 F g −1 . Diab et al 54 prepared nickel cobalt selenide@nickel telluride (Ni x Co 12− x Se@NiTe) core–shell heterostructures via an electrodeposition approach for overall urea electrolysis and supercapacitors (Fig. 6(b)–(e)).…”

Telluride‐Based Materials: A Promising Route for High Performance Supercapacitors

“…[31][32][33] Consequently, SCs are an appropriate alternative to batteries for applications that require rapid energy delivery and uptake, such as electric traction, aerospace, and portable electronics. [34][35][36][37][38][39] Carbons, metal oxides, selenides, nitrides, carbides, sulfides, and phosphides are some of the many materials investigated for their potential in electrochemical energy storage devices. [40][41][42][43][44][45][46][47] The properties of metal chalcogenides (MCs) make them ideal candidates for in-depth research as electrode material for SCs.…”

“…In contrast to batteries, SCs demonstrate superior power density, durability, charging rate, and eco‐friendliness [31–33] . Consequently, SCs are an appropriate alternative to batteries for applications that require rapid energy delivery and uptake, such as electric traction, aerospace, and portable electronics [34–39] …”