Fine-tunable N-doping in carbon-coated CoFe nano-cubes for efficient hydrogen evolution in AEM water electrolysis

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Advanced Composites and Hybrid Materials Pub Date : 2025-01-20 DOI:10.1007/s42114-025-01237-w

Ui Young Lee, Dong In Jeong, Jun Seok Ha, Ju Hyeok Lee, Hyuk Choi, Jung Hyeon Yoo, Hyuck Gu Choi, Hyun You Kim, Bong Kyun Kang, Yoo Sei Park, Dae Ho Yoon

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Abstract

To obtain environment-friendly and renewable hydrogen energy, research is being actively conducted towards lowering the hydrogen evolution reaction (HER) energy barrier through various modifications to the surface of a transition metal bimetal electrochemical catalyst. Herein, we report the development of highly N-doped carbon shell-encapsulated cobalt iron nano cube (CoFe@HNCS) through fine-tuning of the nitrogen-doping content in the carbon shell. The pyridinic N-rich N-doped carbon shell, achieved by adding melamine through electrostatic interactions, improves conductivity, increases active sites, and optimizes Gibbs free energy for hydrogen adsorption. In alkaline HER performance, the optimized CoFe@HNC20 exhibits a lower overpotential (98.2 mV) than CoFe@NCS (133.2 mV) at 10 mA cm⁻². Furthermore, CoFe@HNCS20 as cathode catalyst in anion exchange membrane (AEM) water electrolyzer also shows low cell voltage of 1.808 V to achieve the current density of 0.5 A cm⁻². The expansion of the application to combine solar cells and AEM electrolyzer suggests the possibility of a hydrogen ecosystem.

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碳包覆CoFe纳米立方体的微调n掺杂在AEM水电解中高效析氢

为了获得环境友好的可再生氢能，人们正在积极研究通过对过渡金属双金属电化学催化剂表面进行各种修饰来降低析氢反应（HER）能垒。在此，我们报道了通过微调碳壳中氮掺杂含量，开发出高氮掺杂的碳壳封装钴铁纳米立方体（CoFe@HNCS）。通过静电相互作用加入三聚氰胺，得到了富氮吡啶掺杂碳壳，提高了电导率，增加了活性位点，优化了吸附氢的吉布斯自由能。在碱性HER性能中，优化后的CoFe@HNC20在10 mA cm−2时的过电位（98.2 mV）低于CoFe@NCS （133.2 mV）。此外，CoFe@HNCS20作为负离子交换膜（AEM）水电解槽的阴极催化剂也显示出1.808 V的低电池电压，达到0.5 A cm−2的电流密度。结合太阳能电池和AEM电解槽的应用范围扩大，预示着氢生态系统的可能性。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.