用于多功能电催化的 Co3O4 纳米立方体模板 CoS2 和 CoS2/MoS2 异质结构,ACS Applied Nano Materials

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用于多功能电催化的 Co3O4 纳米立方体模板 CoS2 和 CoS2/MoS2 异质结构
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-06-22 , DOI: 10.1021/acsanm.3c01825
Ayan Mondal ₁ , Harish Reddy Inta ₁ , Avishek Roy ₁ , Ashok Kumar Mahato ₁ , Venkataramanan Mahalingam ₁

Affiliation

设计和开发用于阳极（析氧反应（OER）/肼氧化反应（HzOR））和阴极（析氢反应（HER））反应的高效且低成本的电催化剂是清洁制氢的主要挑战。特别是，通过简单的合成路线制造具有丰富电化学活性位点的电催化剂对于获得优异的催化效率非常有意义。该报告提供了一种通过普通Co ₃ O ₄的硫化反应制备CoS ₂ –MoS ₂异质结构和球状CoS _2的策略分别在存在和不存在钼前体的情况下制备纳米立方体前体。所制备的 CoS ₂ –MoS ₂ (25) 异质结构（用 25 mg Co ₃ O ₄制备）在 1 M KOH 中表现出优异的 HER 活性，在92.5 ± 过电位下提供 10 mA/cm _geo²的电流密度。 3.1毫伏。观察到的 HER 活性增强归因于异质结构的两个组件之间共享的丰富界面区域的水解离动力学的改善。此外，类球体 CoS ₂由于高电化学活性表面积，表现出良好的 OER 和肼氧化反应 (HzOR) 活性。此外，分别使用CoS ₂ –MoS _{2 (25)异质结构}^和球状CoS ₂作为阴极和阳极构建的_碱性电解槽（HER//OER）在电池电位为 1.67 V。此外，肼辅助电解槽 (HER//HzOR) 显示出 0.53 V 的低电池电位，以获得相同的电流密度以及长达 30 小时的出色耐用性。

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Co3O4 Nanocube-Templated CoS2 and CoS2/MoS2 Heterostructures for Multifunctional Electrocatalysis

The design and development of efficient and low-cost electrocatalysts for both anodic (oxygen evolution reaction (OER)/hydrazine oxidation reaction (HzOR)) and cathodic (hydrogen evolution reaction (HER)) reactions are the major challenges for cleaner hydrogen production. Especially, the fabrication of electrocatalysts with abundant electrochemically active sites through simple synthetic routes is of great interest to draw excellent catalytic efficiency. This report provides a strategy to prepare CoS₂–MoS₂ heterostructures and spheroid-like CoS₂ through the sulfurization reaction from the common Co₃O₄ nanocube precursor in the presence and absence of the molybdenum precursor, respectively. The as-prepared CoS₂–MoS₂ (25) heterostructure (prepared with 25 mg of Co₃O₄) shows excellent HER activity in 1 M KOH by delivering a current density of 10 mA/cm_geo² at an overpotential of 92.5 ± 3.1 mV. The observed enhancement in the HER activity is attributed to the improved water dissociation kinetics at the abundant interfacial area shared between the two components of the heterostructure. Besides, spheroid-like CoS₂ shows good OER and hydrazine oxidation reaction (HzOR) activity owing to the high electrochemically active surface area. In addition, the alkaline electrolyzer (HER//OER) constructed using the CoS₂–MoS₂ (25) heterostructure and spheroid-like CoS₂ as the cathode and anode, respectively, delivers a current density of 10 mA/cm_geo² at a cell potential of 1.67 V. Furthermore, the hydrazine-assisted electrolyzer (HER//HzOR) displays a low cell potential of 0.53 V to attain the same current density along with excellent durability up to 30 h.

更新日期：2023-06-22

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