MoS₂nanosheet-coated CoS₂nanowire arrays on carbon cloth as three-dimensional electrodes for efficient electrocatalytic hydrogen evolution

Abstract

5Design and engineering of low-cost and high-efficiency electrocatalysts for hydrogen evolution reaction (HER) has attracted increasing interest in renewable energy research. Herein, MoS 2 nanosheets-coated CoS 2 nanowire arrays supported on carbon cloth (MoS 2 /CoS 2 /CC) were prepared by a two-step procedure that entailed hydrothermal growth of Co(OH) 2 nanowire arrays on carbon cloth, followed by reaction with (NH 4 ) 2 MoS 4 to grow an overlayer of MoS 2 nanosheets. Electrochemical studies showed that the obtained 10 3D electrode exhibited excellent HER activity with an overpotential of −87 mV at 10 mA cm −2 , a small Tafel slope of 73.4 mV dec −1 and prominent electrochemical durability. The results presented herein may offer a new methodology for the design and engineering of effective multilevel structured catalysts for HER based on earth-abundant components.

Facile Synthesis of Mo2C Nanocrystals Embedded in Nanoporous Carbon Network for Efficient Hydrogen Evolution

“…The exchange current density (j 0 ), calculated from the Tafel plots using extrapolation method, of Mo 2 C@C was 0.39 mA•cm 2 , which was much larger than that of commMo 2 C (0.08 mA•cm 2 ) and PVP-C (0.06 mA•cm 2 ), indicating the better HER performance on Mo 2 C@C. The electrochemical double-layer capacitance (C dl ) of Mo 2 C@C was further measured by cyclic voltammetry (CV) technique to evaluate its electrochemical active surface area (ECSA). CV curves ( Figure S3) of Mo 2 C@C were recorded at the potential range of 0.25-0.35 V (vs. RHE) at different scan rates (10,20,40,60,80, and 100 mV•s 1 ). The C dl values were obtained by plotting the current density difference Δj 0.3 at 0.3 V (vs. RHE) versus the scan rates, where the fitting slope was double C dl .…”

“…[3][4][5] It is therefore necessary to search for earth-abundant, cost-effective, and efficient alternatives for HER. In recent years, a wide range of non-Pt catalysts including oxides, [6] sulfides, [7][8][9][10][11] borides, [12][13][14] phosphides, [15][16][17][18][19][20][21][22][23] nitrides, [24][25][26] carbides, [12,[27][28][29][30][31][32][33] nanocarbons, [34][35][36][37] and their composites [38][39][40][41] have been extensively developed to catalyze HER. Among these options, molybdenumbased materials are the attractive ones due to their low cost and good performance.…”

Carbon Cloth‐supported MoS2/Ag2S/Ag3PO4 Composite with High Photocatalytic Activity and Recyclability

“…[39] It is well known that powdery photocatalysts are always hard to be separated and recycled from suspension in practical application for wastewater treatment. [49][50][51][52] In this work, for the first time, we synthesized carbon cloth-supported MoS 2 /Ag 2 S/Ag 3 PO 4 composite (CCMS-AP) by a two-step method including a former hydrothermal reaction and a latter dipping treatment. Many attempts have been done to produce recoverable photocatalysts that can cope with difficulties of separation and recycle of fine photocatalyst particles from aqueous solution.…”

In situ grown cockscomb flower-like nanostructure of NiCo2S4 as high performance supercapacitors

“…However, they show low electrical conductivity during redox reaction process. Recently, transition metal sulfides such as CoS [11], NiS [12], and MoS 2 [13] have drawn great research interest because of their good electrochemical activity and good conductivity. Moreover, ternary metal sulfides such as NiCo 2 S 4 and CoNi 2 S 4 have emerged as promising class of active materials for SCs.…”