Zn,S-掺入 FeCo-LDH 纳米片的形态和电子调控促进双电催化析氧和尿素氧化反应,ACS Sustainable Chemistry & Engineering

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Zn,S-掺入 FeCo-LDH 纳米片的形态和电子调控促进双电催化析氧和尿素氧化反应
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-10-31 , DOI: 10.1021/acssuschemeng.3c03675
Ran Li ₁ , Deliang Zhang ₁ , Huamao Chen ₁ , Shaozhen Wang _{2,

3} , Yunyun Ling _{2,

3} , Caihong Fang ₁

Affiliation

开发用于析氧反应（OER）和尿素氧化反应（UOR）的高性能和低成本电催化剂对于制氢至关重要。在此，我们通过两步水热反应在泡沫镍上制备了 Zn,S 掺入 Fe,Co 层状双氢氧化物 (ZnCoFeS–LDH) 纳米片。具有超薄厚度的有吸引力的二维（2D）纳米片形态提供了丰富的活性位点，促进中间体在表面上的吸附和解吸，并有利于质量传输。ZnCoFeS-LDH的电子结构被修改，从而提高了其电导率，提供高价铁离子（Fe ³⁺），从而从本质上增强了其电催化性能。特别是，所构建的晶体/非晶界面有利于不同相之间的电子转移。作为概念验证，我们检查了 ZnCoFeS-LDH 纳米结构对 OER 和 UOR 的电催化性能。因此，ZnCoFeS-LDH纳米片表现出优异的催化OER活性，其过电势分别为202、217、238和261 mV，可实现10、20、50和100 mA cm –2的电流密度，^分别为与商业RuO ₂相比显着增强。此外，它们在长期（48 小时）和循环（5000 次循环）测量后还表现出出色的耐用性。此外，ZnCoFeS-LDH纳米片还具有优异的UOR活性。测得电位低至1.313、1.334、1.366和1.398 V，分别达到10、20、50和100 mA cm ^–2的电流密度，20小时后具有较高的长期稳定性。

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Morphological and Electronic Regulation of Zn,S-Incorporated FeCo–LDH Nanosheets for Boosting the Bi-Electrocatalytic Oxygen Evolution and Urea Oxidation Reactions

Developing high-performance and low-cost electrocatalysts for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR) is essential for hydrogen production. Herein, we prepared Zn,S-incorporated Fe,Co layered double hydroxide (ZnCoFeS–LDH) nanosheets on nickel foam via a two-step hydrothermal reaction. The attractive two-dimensional (2D) nanosheet morphology with ultrathin thickness offers abundant active sites, promotes the adsorption and desorption of intermediates on the surface, and also facilitates mass transportation. The electronic structure of ZnCoFeS–LDH was modified, which thus improves their conductivity, offers high-valence iron ions (Fe³⁺), and therefore intrinsically enhances their electrocatalytic properties. In particular, the constructed crystalline/amorphous interfaces benefit electron transfer between different phases. As a proof of concept, we examined the electrocatalytic performances of ZnCoFeS–LDH nanostructures to both the OER and UOR. As a result, the ZnCoFeS–LDH nanosheets exhibit excellent catalytic OER activity, with low overpotentials of 202, 217, 238, and 261 mV to achieve current densities of 10, 20, 50, and 100 mA cm^–2, respectively, which are remarkably enhanced in comparison with that of commercial RuO₂. Furthermore, they also demonstrate outstanding durability after long-term (48 h) and cycling (5000 cycles) measurements. Moreover, the ZnCoFeS–LDH nanosheets also possess superior UOR activity. The potentials were measured to be as low as 1.313, 1.334, 1.366, and 1.398 V to reach current densities of 10, 20, 50, and 100 mA cm^–2, respectively, with high long-term stability after 20 h.

更新日期：2023-10-31

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