Islam Md Nurnobi, Hossain Md Mosaraf, Maktedar Shrikant S, Rahaman Mostafizur, Rahman Mohammad Atiqur, Aldalbahi Ali, Hasnat Mohammad A
Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh.
Materials Chemistry & Engineering Research Laboratory, Department of Chemistry, National Institute of Technology, Srinagar, 190006, J & K (UT), India.
Chem Asian J. 2024 Aug 19;19(16):e202301143. doi: 10.1002/asia.202301143. Epub 2024 Mar 28.
The quest for sustainable and clean energy sources has intensified research on the Hydrogen Evolution Reaction (HER) in recent decades. In this study, we have presented a novel Ce-doped TiO catalyst synthesized through the sol-gel method, showcasing its potential as a superior electrocatalyst for HER in an acidic medium. Comprehensive characterization through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Energy dispersive X-ray (EDX), and Raman spectroscopy confirms the successful formation of the catalyst. Electrocatalytic performance evaluation, including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and Tafel analysis, demonstrates that GCE-5wt.%CeTiO outperforms bare GCE, as well as Ce and TiO-based electrodes. Kinetic investigations reveal a Tafel slope of 105 mV dec, indicating the Volmer step as the rate-determining step. The onset potential for HER at GCE-5wt.%CeTiO is -0.16 V vs. RHE, close to the platinum electrode. Notably, the catalyst exhibits a low overpotential of 401 mV to achieve a current density of 10 mA cm with an impressive 95 % Faradaic efficiency. Furthermore, the catalyst demonstrates outstanding durability, maintaining a negligible increase in overpotential during a 14-hour chronoamperometry test. These results have far-reaching implications for the development of cost-effective and efficient electrocatalysts for hydrogen production.
近几十年来，对可持续和清洁能源的追求强化了对析氢反应（HER）的研究。在本研究中，我们展示了一种通过溶胶-凝胶法合成的新型铈掺杂二氧化钛催化剂，该催化剂在酸性介质中作为HER的优异电催化剂具有很大潜力。通过X射线衍射（XRD）、X射线光电子能谱（XPS）、能量色散X射线（EDX）和拉曼光谱进行的综合表征证实了催化剂的成功合成。电催化性能评估，包括开路电位（OCP）、电化学阻抗谱（EIS）和塔菲尔分析，表明玻碳电极负载5wt.%铈的二氧化钛（GCE-5wt.%CeTiO）优于裸玻碳电极以及基于铈和二氧化钛的电极。动力学研究表明塔菲尔斜率为105 mV dec，表明Volmer步骤是速率决定步骤。GCE-5wt.%CeTiO上HER的起始电位相对于可逆氢电极（RHE）为-0.16 V，接近铂电极。值得注意的是，该催化剂实现10 mA cm的电流密度时过电位低至401 mV，法拉第效率高达95%。此外，该催化剂表现出出色的耐久性，在14小时的计时电流法测试中过电位增加可忽略不计。这些结果对开发用于制氢的经济高效电催化剂具有深远意义。
