Abstract

Water splitting was considered to be a sustainable and promising strategy for production of clean hydrogen energy to address environmental crisis and potential energy. In this work, we present the cost-effective, convenient, and efficient method for in situ growth of peculiar MoS₂–Ni₃S₂ nanoflake heterostructures on three-dimensional (3D) Ni foam. The synthesized electrocatalyst was used as a self-supported bifunctional electrode to catalyze oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), and it exhibits an overpotential of 125 mV to achieve 10 mA cm⁻² for HER and an overpotential of 280 mV to achieve 40 mA cm⁻² for OER. In addition, the material presents a cell voltage of only 1.556 V (10 mA cm⁻²) for overall water splitting in 1 M KOH solution and a robust durability and long-term stability (over 50 h at 10 mA cm⁻²). The excellent electrocatalytic performance with superior stability is mainly due to the 3D porous conductive substrates, peculiar layered heterostructures, superhydrophilic surfaces, and synergistic advantages of bimetallic sulfides. The material has a great application prospect as an earth-abundant electrocatalyst in water splitting for large-scale hydrogen or oxygen production.

中文翻译：

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超亲水MoS 2 -Ni 3 S 2纳米片状异质结构在3D Ni泡沫上生长，作为有效的整体水分解电催化剂

摘要

分水被认为是生产清洁氢能源以解决环境危机和潜在能源的可持续和有希望的战略。在这项工作中，我们提出了在三维（3D）Ni泡沫材料上原位生长MoS ₂ -Ni ₃ S ₂纳米片状异质结构的经济有效，方便且有效的方法。合成的电催化剂被用作自支撑双功能电极，以催化氧释放反应（OER）和氢释放反应（HER），并且表现出125 mV的超电势，以实现HER的10 mA cm ^-2和280的超电势。 mV达到40 mA cm ^-2用于OER。此外，该材料的电池电压仅为1.556 V（10 mA cm ^-2），可用于在1 M KOH溶液中进行总水分解，并且具有强大的耐用性和长期稳定性（在10 mA cm ^-2时可保持50 h以上）。具有出色稳定性的出色电催化性能主要归因于3D多孔导电基材，特殊的层状异质结构，超亲水表面以及双金属硫化物的协同优势。该材料作为一种富水电催化剂，在大规模生产氢气或氧气的水分解中具有广阔的应用前景。