Rational Design of Dynamic Bimetallic NiCoSe₂/2D Ti₃C₂T_x MXene Hybrids for a High-Performance Flexible Supercapacitor and Hydrogen Evolution Reaction

Abstract

Herein, intelligent construction of an NiCoSe2/Ti3C2T x hybrid heterostructure with unique morphologies was performed using a hydrothermal protocol. The coexistence of the dual metal core in Ni–Co selenides and Ti3C2T x MXene helps in realizing outclassing physicochemical properties. The two-dimensional (2D) heterostructure provides an admirably smaller Tafel slope of 86 mV/dec, indicating the faster H2 evolution rate (Pt/C: 82 mV/dec) and overpotential of 62 mV at 10 mA/cm2 (Pt/C: 52 mV/dec). Our heterostructure devices demonstrate a specific energy density of 32.05 Wh kg–1 coupled with a power density of 0.2 kW kg–1 and maintain 15.39 Wh kg–1 coupled with a power density of 0.92 kW kg–1. The experimental results underpin new profitable opportunities and scale up deployment of the bifunctional electrodes. Further, the experimental findings were supported through density functional theory (DFT) simulations in terms of a lower overpotential and higher quantum capacitance for the heterostructure NiCoSe2/MXene compared to pristine NiCoSe2. There is charge transfer from MXene Ti3C2T x to NiCoSe2 leading to enhanced electronic states near the Fermi level responsible for enhanced catalytic activities and charge storage performance.

Hydrothermal Self-Assembly of α-MnSe-Loaded Honeycomb-Like Biomimetic Ti3C2Tx/Graphene Aerogel Microstructure (α-MnSe/Ti3C2Tx/rGO) as Efficient Electrode Material for Energy Storage Application

“…No phase transformation of the MnSe phase was observed in MnSe/GA and MnSe/TCGA, inferring that the original crystal structure of MnSe remained intact during the formation of the composite aerogel. However, loss in intensity of peaks with a small shift in peak positions toward lower 2θ values (represented by (200) plane positioned at 2θ = 32.8° in Figure (c)) can be attributed to a decrease in the crystallinity and changes in the interplanar distance. , Furthermore, the concomitant existence of Bragg’s peaks from all components in MnSe/TCGA confirms that the resulting material is a hybrid of MnSe, rGO, and Ti 3 C 2 T x …”

Facile Synthesis of Crystalline Molybdenum Carbide (Mo2C) Nanoparticles Coupled with a N-Doped Porous Carbon Sheet: A Synergistic Effect on the Electrocatalytic Hydrogen Evolution Reaction

“…The main reasons for Mo 2 C-NC’s enhanced electrocatalytic activity are assessed by the experimental results, Table S1, and pertinent discussions. A 2D sheet structure with evenly spaced active Mo 2 C nanoparticles in a correctly formed C moiety with heteroatom doping; a porous structure that makes it easier to adsorb more electrolytes; and a high geometrical and electrochemically active surface area, which provides better active sites for HER. − …”

Three-Dimensional Network of Highly Uniform Cobalt Oxide Microspheres/MXene Composite as a High-Performance Electrocatalyst in Hydrogen Evolution Reaction

“…3a reveal that the Co-gly spheres exhibit wide diffraction peaks, which is indicative of the presence of metal alkoxides. 48 The primary peaks of the Co 3 O 4 sample in its original state appear clearly at diffraction angles of 19.00 (111), 31.27 (022), 36.85 (113), 44.82 (004), 55.67 (224), 59.37 (115), and 65.25 (044)°. These peaks can be accurately attributed to the JCPDS no.…”