Cobalt-substituted iron-based wolframite synthesized via polyol route for efficient oxygen evolution reaction
Cobalt-substituted iron-based wolframite synthesized via polyol route for efficient oxygen evolution reaction
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DOI：
10.1016/j.elecom.2020.106834
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发表时间：
2020-11-01
影响因子：
5.4
通讯作者：
Crosnier, Olivier
中科院分区：
文献类型：
--
作者：
Nakayama, Masaharu;Takeda, Airi;Crosnier, Olivier
具有黑钨矿晶体结构的二元氧化钨，如FeWO4和CoWO4，对析氧反应（OER）具有较差的电催化活性。然而，在晶体框架中加入第三种元素增加了OER在碱性介质中的活性。具体来说，通过多元醇途径制备的Co0.5Fe0.5WO4在相当小的过电位（eta）和Tafel斜率（分别为331 mV和36.8 mV dec(-1)）下产生了10 mA cm（-2）的电流密度。该过电位值优于传统水热法制备的Co0.5Fe0.5WO4 （eta在10 mA cm(-2) = 360 mV）和OER基准催化剂RuO2 （365 mV）。在过电位为400 mV时，多元醇合成的Co0.5Fe0.5WO4的周转频率（TOF）估计为0.235 s(-1)，而在10 mA cm（-2）下稳定工作至少24 h。
Binary tungsten oxides with a wolframite crystal structure, such as FeWO4 and CoWO4, have poor electrocatalytic activity for the oxygen evolution reaction (OER). However, the incorporation of a third element into the crystalline framework increased the OER activity in an alkaline medium. Specifically, Co0.5Fe0.5WO4 prepared through a polyol route generated a current density of 10 mA cm(-2) at a considerably small overpotential (eta) and Tafel slope (331 mV and 36.8 mV dec(-1), respectively). This overpotential value was superior to those of Co0.5Fe0.5WO4 fabricated through a conventional hydrothermal route (eta at 10 mA cm(-2) = 360 mV) and commercial RuO2 (365 mV), a benchmark catalyst for the OER. The turnover frequency (TOF) of the polyol-synthesized Co0.5Fe0.5WO4 was estimated to be 0.235 s(-1) at an overpotential of 400 mV, while stable operation at 10 mA cm(-2) was maintained for at least 24 h.