کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6471220 1424115 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanistic insight into oxygen evolution electrocatalysis of surface phosphate modified cobalt phosphide nanorod bundles and their superior performance for overall water splitting
ترجمه فارسی عنوان
بینش مکانیکی به الکتروکاتالیست تکاملی اکسیژن فسفات سطحی بسته های نانوذرات فسفات کبالت و عملکرد برتر آنها برای تقسیم آب کلی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- Co-Pi/CoP/Ti requires only 310 mV to deliver a current density of 10 mA cm−2 for OER.
- Co-Pi/CoP/Ti affords 10 mA cm−2 by a cell voltage of only 1.60 V for overall water splitting.
- The overall water-splitting device based on Co-Pi/CoP/Ti can be powered by a 1.5 V AAA battery.
- OER mechanism of Co-Pi/CoP/Ti was systematically investigated.

We here design and fabricate a catalytic electrode by direct growth of cobalt phosphide nanorod bundles with simultaneous surface phosphate (denoted Pi) modification on Ti plate through a simple one-step low-temperature phosphorization process. When the resultant electrodes act as an electrocatalyst for alkaline water splitting, the Co-Pi/CoP/Ti exhibits the superior activity for electrocatalytic oxygen evolution reaction (OER). The Co-Pi/CoP/Ti requires only 310 mV to deliver a current density of 10 mA cm−2 for OER catalysis, which is competitive with state-of-the-art RuO2 and superior to most of cobalt-based phosphides. Mechanistic study suggests that the Co-Pi/CoP undergoes composition and structure conversion during OER catalysis, which endows this electrode with the synergetically improved electrocatalytic OER activity. Serving as a robust bifunctional electrode in a two-electrode configuration for alkaline water electrolyzer, the Co-Pi/CoP/Ti affords current density of 10 mA cm−2 by a cell voltage of only about 1.60 V and maintains its stable performance for at least 24 h. Even the overall water-splitting device based on Co-Pi/CoP/Ti electrodes can be powered by a 1.5 V AAA battery. The present finding offers an attractive electrode for cost-effective and energy-efficient water electrolysis.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 242, 10 July 2017, Pages 355-363
نویسندگان
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