Al-Salihy Adel, Zhu Qiancheng, Hu Jing, Liang Ce, Radwan Ahmed Bahgat, Salah Abdulwahab, Xu Ping
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
Department of Physics, Faculty of Applied Science, Thamar University, Dhamar 87246, Yemen.
ACS Appl Mater Interfaces. 2025 May 14;17(19):28199-28210. doi: 10.1021/acsami.5c02693. Epub 2025 Apr 29.
Electrochemical water splitting has emerged as a promising solution for sustainable hydrogen production, but the development of efficient, durable, and cost-effective bifunctional electrocatalysts remains a critical challenge. In this work, we report the novel fabrication of composite materials consisting of nickel molybdate (NiMoO) coated with polyaniline (PANI). NiMoO nanorods were initially synthesized on nickel foam (NF) using a hydrothermal technique and subsequently coated with PANI via UV-assisted polymerization. The resulting NiMoO@PANI nanostructures demonstrate increased active sites for improved efficiency in electron transfer and catalytic activity. This combination enhanced hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance, achieving reduced overpotential values of 88 and 167 mV for HER and OER at 10 mA cm, respectively. Comprehensive electrochemical evaluations, including Tafel slope, electrochemical impedance spectroscopy (EIS), and electrochemical double-layer capacitance () measurements, validate the enhancements in kinetics and charge transfer facilitated by the PANI coating. Density functional theory (DFT) calculations offer further insights into the improved catalytic efficiency, showing reduced barrier for water splitting (Δ = 0.45 eV), nearly negligible hydrogen adsorption energy (Δ = 0.08 eV), appropriate adsorption energy of oxygen evolution (Δ - Δ = 2.58 eV), and high density of states close to the Fermi level. The NiMoO@PANI nanostructures exhibit excellent stability for 310 h without interruption, suggesting the potential for sustainable hydrogen production.
电化学水分解已成为一种有前景的可持续制氢解决方案，但开发高效、耐用且经济高效的双功能电催化剂仍然是一项关键挑战。在这项工作中，我们报道了由包覆聚苯胺（PANI）的钼酸镍（NiMoO）组成的复合材料的新颖制备方法。首先使用水热技术在泡沫镍（NF）上合成NiMoO纳米棒，随后通过紫外辅助聚合包覆PANI。所得的NiMoO@PANI纳米结构展示出增加的活性位点，以提高电子转移效率和催化活性。这种组合增强了析氢反应（HER）和析氧反应（OER）性能，在10 mA cm时HER和OER的过电位分别降低至88和167 mV。包括塔菲尔斜率、电化学阻抗谱（EIS）和电化学双层电容（）测量在内的综合电化学评估验证了PANI涂层促进的动力学和电荷转移增强。密度泛函理论（DFT）计算进一步深入了解了提高的催化效率，显示水分解的势垒降低（Δ = 0.45 eV）、氢吸附能量几乎可忽略不计（Δ = 0.08 eV）、析氧的适当吸附能量（Δ - Δ = 2.58 eV）以及靠近费米能级的高态密度。NiMoO@PANI纳米结构在310 h内无间断地表现出优异的稳定性，表明其在可持续制氢方面的潜力。
