Djara Razik, Lacour Marie-Agnès, Merzouki Abdelhafid, Cambedouzou Julien, Cornu David, Tingry Sophie, Holade Yaovi
Laboratoire de Physico-Chimie des Hauts Polymères (LPCHP), Université Ferhat Abbas, Sétif 19000, Algeria.
Institut Européen des Membranes, IEM UMR 5635, University of Montpellier, ENSCM, CNRS, 34090 Montpellier, France.
Polymers (Basel). 2021 Jan 7;13(2):190. doi: 10.3390/polym13020190.
The breakthrough in water electrolysis technology for the sustainable production of H, considered as a future fuel, is currently hampered by the development of tough electrocatalytic materials. We report a new strategy of fabricating conducting polymer-derived nanostructured materials to accelerate the electrocatalytic hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and water splitting. Extended physical (XRD, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX)) and electrochemical (cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS)) methods were merged to precisely characterize the as-synthesized iridium and ruthenium modified polyaniline (PANI) materials and interrogate their efficiency. The presence of Ir(+III) cations during polymerization leads to the formation of Ir metal nanoparticles, while Ru(+III) induces the formation of RuO oxide nanoparticles by thermal treatment; they are therefore methods for the on-demand production of oxide or metal nanostructured electrocatalysts. The findings from using 0.5 M HSO highlight an ultrafast electrochemical kinetic of the material PANI-Ir for HER (36 - 0 = 36 mV overpotential to reach 10 mA cm at 21 mV dec), and of PANI-Ru for OER (1.47 - 1.23 = 240 mV overpotential to reach 10 mA cm at 47 mV dec), resulting in an efficient water splitting exactly at its thermoneutral cell voltage of 1.45 V, and satisfactory durability (96 h).
被视为未来燃料的用于可持续生产氢气的水电解技术突破，目前受到难制备的电催化材料发展的阻碍。我们报告了一种制备导电聚合物衍生的纳米结构材料的新策略，以加速电催化析氢反应（HER）、析氧反应（OER）和水分解反应。结合了扩展的物理方法（XRD、扫描电子显微镜（SEM）、能量色散X射线光谱（EDX））和电化学方法（循环伏安法（CV）、线性扫描伏安法（LSV）、电化学阻抗谱（EIS）），以精确表征合成的铱和钌改性聚苯胺（PANI）材料并研究其效率。聚合过程中Ir(+III)阳离子的存在导致Ir金属纳米颗粒的形成，而Ru(+III)通过热处理诱导RuO氧化物纳米颗粒的形成；因此，它们是按需生产氧化物或金属纳米结构电催化剂的方法。使用0.5 M HSO的研究结果表明，材料PANI-Ir用于HER具有超快的电化学动力学（在21 mV dec时过电位为36 - 0 = 36 mV以达到10 mA cm），材料PANI-Ru用于OER也具有超快的电化学动力学（在47 mV dec时过电位为1.47 - 1.23 = 240 mV以达到10 mA cm），从而在其1.45 V的热中性电池电压下实现了高效的水分解，并具有令人满意的耐久性（96小时）。
