2 декември 2025
Parvanova-Mancheva, T., Chakarova, V., Gabrovska, M., Atanasova - Vladimirova, S., Baeva, A., Andreeva, R., Hodzhaoglu, F., Nikolova, D..
(
Димитринка Николова;
Маргарита Габровска;
Цветомила Първанова-Манчева;
)
Abstract
The HER and OER performance of two series of NiCo electrocatalysts (with Ni/Co weight ratios of 70/30, 50/50, and 30/70) was evaluated. These electrocatalysts were prepared via electrodeposition, a relatively simple synthesis method suitable for practical realization and scalability. Commercially available conductive supports, including 3D-structured Ni-foam (NF) and 2D-structured Fe-steel plate (FS), were selected for their suitability in electrode applications. This study examines the bifunctional behavior of catalyst electrodes for HER and OER, considering the combined influence of support type, Ni/Co ratio, and phosphorus doping. To understand the practical aspects of both methodology and structure to function, the physicochemical characterization focused on the as-prepared state of the four highly active electrocatalysts: Ni30Co70/NF, Ni50Co50/FS, Ni30Co70P/NF, and Ni50Co50P/FS. The techniques such as XRD, Optical microscopy, FE-SEM-EDS, Cross-sectional EDS line scan analysis, and XPS were used. Electrochemical investigations revealed that Ni50Co50P/FS exhibited superior bifunctional efficiency at current densities of 10 mA cm?2, ?HER =?23?mV and ?OER =?400?mV. Notably, the demonstrated exceptional HER activity of non-noble Ni50Co50P/FS electrocatalyst is comparable to reported noble metal-based Pt compositions. Additionally, the Ni50Co50P/FS configuration exhibited low overpotential degradation at a commercially relevant current density of 100?mA cm?? in both anodic and cathodic currents, ?HER =?103?mV and ?OER =?498?mV. The unique three-dimensional microstructure of the NiCoP coating on 2D-Fe-steel was achieved through a co-electrodeposition method, employed as a scalable and cost-effective fabrication technique. The performance of the Ni??Co??P/FS electrode results from this morphology, which provides abundant active reaction sites and facilitates reactant diffusion through numerous gaps between the particles. Additionally, the Ni50Co50P coating exhibited a higher surface concentration of Ni compared to its deeper layers. Future research will focus on fine-tuning efficiency, stability, and durability at high current densities (100?mA cm??) to enable large-scale practical application real-world alkaline electrolyzer operation.
Catalysis Today, 460, 2025, ISSN:1873-4308, DOI:https://doi.org/10.1016/j.cattod.2025.115495, 115495. SJR (Scopus):1.05, JCR-IF (Web of Science):5.3 Q1, не оглавява ранглистата (Scopus)
https://www.sciencedirect.com/science/article/pii/S092058612500313X
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