He Bin, Wang Xin-Chao, Xia Li-Xue, Guo Yue-Qi, Tang Ya-Wen, Zhao Yan, Hao Qing-Li, Yu Tao, Liu Hong-Ke, Su Zhi
Key Laboratory of Biofunctional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210046, P. R. China.
Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing, 210094, P. R. China.
ChemSusChem. 2020 Oct 7;13(19):5239-5247. doi: 10.1002/cssc.202001434. Epub 2020 Aug 24.
A rational design is reported of Fe-doped cobalt telluride nanoparticles encapsulated in nitrogen-doped carbon nanotube frameworks (Fe-Co Te @NCNTF) by tellurization of Fe-etched ZIF-67 under a mixed H /Ar atmosphere. Fe-doping was able to effectively modulate the electronic structure of Co Te , increase the reaction activity, and further improve the electrochemical performance. The optimized electrocatalyst exhibited superior hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances in an alkaline electrolyte with low overpotentials of 107 and 297 mV with a current density of 10 mA cm , in contrast to the undoped Co Te @NCNTF (165 and 360 mV, respectively). The overall water splitting performance only required a voltage of 1.61 V to drive a current density of 10 mA cm . Density function theory (DFT) calculations indicated that the Fe-doping not only afforded abundant exposed active sites but also decreased the hydrogen binding free energy. This work provided a feasible way to study non-precious-metal catalysts for an efficient overall water splitting.
报道了一种通过在混合H₂/Ar气氛下对Fe蚀刻的ZIF-67进行碲化反应，制备出包裹在氮掺杂碳纳米管框架中的Fe掺杂碲化钴纳米颗粒（Fe-CoTe@NCNTF）的合理设计方法。Fe掺杂能够有效调节CoTe的电子结构，提高反应活性，并进一步改善电化学性能。优化后的电催化剂在碱性电解质中表现出优异的析氢反应（HER）和析氧反应（OER）性能，在电流密度为10 mA cm⁻²时，过电位分别为107和297 mV，相比未掺杂的CoTe@NCNTF（分别为165和360 mV）。全水解性能仅需1.61 V的电压就能驱动10 mA cm⁻²的电流密度。密度泛函理论（DFT）计算表明，Fe掺杂不仅提供了大量暴露的活性位点，还降低了氢结合自由能。这项工作为研究用于高效全水解的非贵金属催化剂提供了一种可行的方法。
