Huang Haiyan, Zhao Jing, Liu Rui
Shanghai Key Lab of D&A for Metal Functional Materials, Department of Polymeric Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
Shanghai Key Lab of D&A for Metal Functional Materials, Department of Polymeric Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
J Colloid Interface Sci. 2021 Jan 15;582(Pt A):396-404. doi: 10.1016/j.jcis.2020.08.051. Epub 2020 Aug 17.
Herein, we reported a facile strategy to prepare bimetal-polyphenol complexes coating on carbon nanotube (CNT) as a highly efficient OER catalyst. Tannic acid was used as an organic ligand to simultaneously coordinate with Ni and Fe ions and at the same time wrapped the surface of CNT. The obtained NiFe/TA@CNT catalyst showed superior catalytic activity with a low overpotential of 287 mV to reach the current density of 10 mA cm under a small Tafel slope of 70.24 mV dec and exhibited persistent stability in alkaline environment. Experimental results and density functional theory (DFT) calculations revealed that the electron transfer from CNT to NiFe/TA on the heterointerface modified the local electronic environment of the catalyst at atomic level and decreased the binding energies of adsorbed species, thus greatly accelerating the OER kinetic process and enhancing electrocatalytic activity.
在此，我们报道了一种简便的策略，用于在碳纳米管（CNT）上制备双金属-多酚配合物涂层，作为一种高效的析氧反应（OER）催化剂。单宁酸用作有机配体，与镍离子和铁离子同时配位，同时包裹碳纳米管的表面。所制备的NiFe/TA@CNT催化剂表现出优异的催化活性，在70.24 mV dec的小塔菲尔斜率下，低过电位为287 mV时即可达到10 mA cm的电流密度，并且在碱性环境中表现出持久的稳定性。实验结果和密度泛函理论（DFT）计算表明，电子从碳纳米管转移到异质界面上的NiFe/TA，在原子水平上改变了催化剂的局部电子环境，降低了吸附物种的结合能，从而极大地加速了析氧反应动力学过程并提高了电催化活性。
