Engineering Thin MoS₂ Nanosheets on TiN Nanorods: Advanced Electrochemical Capacitor Electrode and Hydrogen Evolution Electrocatalyst

Abstract

The poor intrinsic conductivity of MoS2 presents a huge barrier for the exploitation of its versatile properties, especially as an electrochemical capacitor (EC) electrode and hydrogen evolution reaction (HER) catalyst. Toward this challenge, TiN nanorods coated by randomly oriented MoS2 nanosheets (TMSs) are engineered as state-of-the-art electrodes for ECs and HER. In light of the synergistic effects, TMS electrodes show favorable performance as both a binder-free EC electrode and HER catalyst. Importantly, the optimal TMS achieves an areal capacitance of 662.2 mF cm–2 at 1 mA cm–2 with superior rate capability and ultralong cycling stability. As the catalyst for HER in 0.5 M H2SO4, it shows an overpotential of 146 mV at 10 mA cm–2, a favorable Tafel slope, and good electrocatalytic stability. All of the results highlight the favorable integration of TiN and MoS2 and provide clear insight correlating the hybrid structure and the corresponding electrochemical performance.

Flexible all-solid-state micro-supercapacitor based on Ni fiber electrode coated with MnO2 and reduced graphene oxide via electrochemical deposition

“…Various flexible energy storage devices have been developed to power the flexible/bendable electronic equipment, such as flexible supercapacitors [21][22][23], flexible Li-ion batteries [24] and flexible rechargeable batteries [25].…”

Tailoring the d‐Band Centers Enables Co4N Nanosheets To Be Highly Active for Hydrogen Evolution Catalysis

“…[1d, 2] However,the sluggish hydrogen evolution reaction (HER) in alkaline medium and the associated substantial energy loss greatly impede the efficiency of water electrolysis.A lthough Pt and Pt-based materials are the benchmark HER catalysts,t he cost of Pt severely restrains its application on an industrially scale. [2b] To this end, exploring earth-abundant and catalytically active non-noble-metal-based catalysts,s uch as transition-metal nitrides, [3] phosphides, [4] sulfides, [5] selenides, [6] and carbides, [7] is highly imperative.Tr ansition-metal nitrides have emerged as an interesting family of HER catalysts,b ecause of their high electrical conductivity and noble-metal-like behavior. [8] Va rious transition-metal nitrides,s uch as MoN, [9] Ni 3 N, [10] WN, [11] and alloyed metal nitrides, [3a, 12] have been reported to be HER catalysts in alkaline media.…”

Tailoring the d‐Band Centers Enables Co4N Nanosheets To Be Highly Active for Hydrogen Evolution Catalysis

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Endowing materials with specific functions that are not readily available is always of great importance,b ut extremely challenging.C o 4 N, with its beneficial metallic characteristics,h as been proved to be highly active for the oxidation of water,w hile it is notoriously poor for catalyzing the hydrogen evolution reaction (HER), because of its unfavorable d-band energy level. [2b] To this end, exploring earth-abundant and catalytically active non-noble-metal-based catalysts,s uch as transition-metal nitrides, [3] phosphides, [4] sulfides, [5] selenides, [6] and carbides, [7] is highly imperative.Tr ansition-metal nitrides have emerged as an interesting family of HER catalysts,b ecause of their high electrical conductivity and noble-metal-like behavior. This concept could provide valuable insights into the design of other catalysts for HER and beyond.

Hydrogen holds great promise in the development of clean energy systems,because of its high gravimetric energy density and environmental friendliness.

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“…[1] Alkaline electrolysis has been viewed as the most feasible way for the industrial production of hydrogen. [2b] To this end, exploring earth-abundant and catalytically active non-noble-metal-based catalysts,s uch as transition-metal nitrides, [3] phosphides, [4] sulfides, [5] selenides, [6] and carbides, [7] is highly imperative. [2b] To this end, exploring earth-abundant and catalytically active non-noble-metal-based catalysts,s uch as transition-metal nitrides, [3] phosphides, [4] sulfides, [5] selenides, [6] and carbides, [7] is highly imperative.…”