Constructing Stable MoOx-NiSx Film via Electrodeposition and Hydrothermal Method for Water Splitting

Abstract

The hydrothermal method is a frequently used approach for synthesizing HER electrocatalysts. However, a weak tolerance to high temperature is an intrinsic property of carbon cloth (CC) in most situations, and CC-based catalysts, which require complex technological processes in low-temperature environments, exhibit weak stability and electrochemical performance. Hence, we provide a new solution for these issues. In this work, MoO3-NiSx films of 9H5E-CC catalysts are synthesized, first through electrodeposition to form Ni particles on CC and then through a hydrothermal reaction to reform the reaction. The advantages of this synthetic process include mild reaction conditions and convenient operation. The obtained MoO3-NiSx film presents excellent catalytic activity and stability for HER. MoO3-NiSx film requires only a low overpotential of 142 mV to drive 10 mA cm−2 for HER in 1.0 m KOH, and the obtained 9H5E-CF film only needs 294 mV to achieve 50 mA cm−2 for OER. Remarkably, they also show excellent OER, HER, and full water splitting long-term electrochemical stability, maintaining their performance for at least 72 h. This work can be expanded to provide a new strategy for the fabrication of stable, high-performing electrodes using simple, mild reaction conditions.

Expediting Corrosion Engineering for Sulfur-Doped, Self-Supporting Ni-Fe Layered Dihydroxide in Efficient Aqueous Oxygen Evolution

“…At present, RuO 2 , IrO 2 and other noble metal catalysts are commonly recognized to be commercially used in electrochemical water-splitting applications, but their scarcity and high price presented an obstacle to scale-up [19][20][21][22][23]. Comparatively, a large number of nonnoble-metal-based catalysts, especially transition metal sulfides [24][25][26] phosphates [27], nitrides [28][29][30] and hydroxide [31,32], have been extensively studied due to their abundant earth reserves, low price and tunable electronic structure.…”