氧化电沉积薄膜过渡金属 (氧) 水氧化物作为氧化物进化催化剂
Carlos G Morales-Guio1, Laurent Liardet1, Xile Hu1
1Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne, Switzerland.
Journal of the American Chemical Society
|June 28, 2016
概括
研究人员开发了一种新的电化学方法,用于制造氧化演化反应 (OER) 的薄膜催化剂,这是水电解的关键步骤. 最活跃的催化剂CoFeOx和CoFeNiOx可以从可再生能源储存中有效生产.
科学领域:
- 电化学
- 材料科学
- 储存可再生能源
背景情况:
- 水电解对于储存可再生能源作为化学燃料至关重要.
- 氧化演化反应 (OER) 是水电解的主要能源瓶.
- 开发高效的OER催化剂对于提高电解性能至关重要.
研究的目的:
- 引入一种用于OER的薄膜过渡金属 (氧) 氧化物催化剂的新型电化学方法.
- 调查催化剂加载和活性之间的关系.
- 对高效水电解的高活性OER催化剂进行分类和识别.
主要方法:
- 薄膜催化剂的电化学沉积.
- 电化学石英微晶平衡用于精确的负载测定 (< 1 μg cm-2).
- 电压测量和阻抗光谱,以确定负载-活动关系.
主要成果:
- 薄膜催化剂表现出晶体的纳米领域.
- 确定了所有催化剂的内在活动区域.
- 将催化剂分为三个活动类别,其中FeNiOx,CoFeOx和CoFeNiOx是最活跃的.
- 在高电流密度 (10-100 mA cm−2) 中,通过 CoFeOx 和 CoFeNiOx 实现了低超电位 (240-270 mV).
结论:
- 这种新型的沉积方法产生了高性能OER催化剂.
- CoFeOx和CoFeNiOx表现出卓越的活性和对高效的阳极电极的潜力.
- 这种进步有助于通过水电解制造有效的可再生能源催化剂.
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