Mohamed J. Saadh, Dheyaa J. Jasim, L. Alejandro, Shelesh Krishna Saraswat, Christian Giovanni Flores Arévalo, Néstor Augusto Estrada Brito, Rahadian Zainul, Mohd Abul Hasan, Saiful Islam
This study investigates the influence of pyrrole concentration and the addition of MIL53(Al)/Fe2O3 nanocomposite on the hydrogen evolution reaction (HER) activity of polypyrrole (PPy) electrocatalysts. Electrodeposition of PPy on a nickel (Ni) substrate was conducted using various pyrrole concentrations ranging from 0.01 M to 0.2 M, followed by evaluation through linear sweep voltammetry (LSV) experiments. Results indicated that PPy synthesized with 0.1 M pyrrole exhibited the highest HER activity, characterized by lower onset potential and higher current density. Additionally, the incorporation of MIL53(Al)/Fe2O3 nanocomposite into PPy coating enhanced electrode performance, evidenced by high charge transfer kinetics. Nyquist diagrams and electrochemical impedance spectroscopy (EIS) analysis confirmed accelerated electron transfer kinetics and lower charge transfer resistance for PPy@MIL53(Al)/Fe2O3 compared to Ni substrate. Despite a lower electrochemical double layer capacitance (Cdl), PPy@MIL53(Al)/Fe2O3 demonstrated enhanced catalytic activity, underscoring the importance of electrode morphology and active site characteristics. Furthermore, stability tests revealed consistent performance of PPy@MIL53(Al)/Fe2O3 over prolonged electrolysis periods, highlighting its potential for practical applications in hydrogen generation. © 2024 Elsevier Ltd
Faculty of Pharmacy, Middle East University, Amman, 11831, Jordan; Department of Petroleum Engineering, Al-Amarah University College, Maysan, Iraq; Independent Researcher, Ecuador; Department of ECE, GLA University, Mathura, 281406, India; Facultad de mecánica, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba, 060155, Ecuador; Facultad de informática y electrónica, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba, 060155, Ecuador; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Indonesia; Center for Advanced Material Processing, Artificial Intelligence, and Biophysics Informatics (CAMPBIOTICS), Universitas Negeri Padang, Indonesia; Research Fellow, INTI International University, Negeri Sembilan, Nilai, 71800, Malaysia; Professor Fellow, Superior University, Lahore, Pakistan; Civil Engineering Department, College of Engineering, King Khalid University, Abha, 61421, Saudi Arabia
