کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6470081 1424104 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interwoven CoSe2/CNTs hybrid as a highly efficient and stable electrocatalyst for hydrogen evolution reaction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Interwoven CoSe2/CNTs hybrid as a highly efficient and stable electrocatalyst for hydrogen evolution reaction
چکیده انگلیسی


- Interwoven CoSe2/CNTs hybrid was prepared by a facile one-pot hydrothermal method.
- Ultra-small CoSe2 nanoparticles are tightly decorated on conductive CNTs networks.
- The CoSe2/CNTs hybrid delivers a low Tafel slope and excellent long-term stability.
- Good HER performance of CoSe2/CNTs is due to its unique interwoven structure.

For the first time, the interwoven CoSe2/CNTs hybrid with ultra-small CoSe2 nanoparticles on highly conductive CNTs has been synthesized by a facile one-pot hydrothermal method. The CoSe2/CNTs hybrid has been investigated as electrocatalysts for the Hydrogen evolution reaction (HER) in acidic media. The physicochemical characterizations of CoSe2/CNTs have been performed by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The HER performances have been evaluated by linear sweep voltammetry (LSV), cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance spectroscopy (EIS). The CNT content in the CoSe2/CNTs hybrids has been optimized and CoSe2/CNTs (14.7 wt%) exhibits the best HER performance. It delivers a very small Tafel slope of −32 mV/dec, a low onset potential of −150 mV vs RHE and overpotential of −186 mV at −10 mA/cm2, which are much better than those of bare CoSe2 with a Tafel slope of −52 mV/dec, an onset potential of −234 mV vs RHE and overpotential of −293 mV vs RHE at −10 mA/cm2. Furthermore, the CoSe2/CNTs hybrid also demonstrates good long-term stability even after 1000 cycles. The excellent HER performance of CoSe2/CNTs can be attributed to its unique and conductive interwoven structure. This work provides insights into rational design and facile synthesis of non-precious electrocatalysts with high efficiency and good stability for HER.

296

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 253, 1 November 2017, Pages 200-207
نویسندگان
, , , , , , , , ,