通过选择性原子替代在氧化物中的四面体位点进行高增强氧气演变催化
Yan Liu1, Yiran Ying1, Linfeng Fei1
1Department of Applied Physics , The Hong Kong Polytechnic University , Hung Hom, Kowloon , Hong Kong , China.
Journal of the American Chemical Society
|April 25, 2019
概括
将铁添加到氧化物中可以显著提高氧演化反应 (OER) 的性能. 这种新的催化剂材料实现了超低的潜力,克服了实际OER应用的重大障碍.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 过高的潜能限制了过渡金属氧化物在氧化演化反应 (OER) 的实际使用.
- 优化电子结构和吸附能量对于高效的OER催化剂至关重要.
研究的目的:
- 调查铁对尼科氧化物的OER性能的影响.
- 了解氧化物中Fe的位置偏好及其对催化活性的影响.
主要方法:
- 理论计算以确定四面体位点中的Fe的能量优势.
- 氧化物催化剂的合成.
- 用X射线吸收光谱 (XAS) 分析Fe注部位和氧化状态.
主要成果:
- 铁在尼科氧化物中优先占据四面体位置.
- 这种兴奋剂在八面位点上诱导Ni3+和CO2+,增强OER活性.
- 氧化NiCoFe催化剂在10 mA cm−2时达到201 mV cm−2的超低电位和39 mV dec−1的Tafel斜率.
结论:
- 在尼科氧化物中添加铁是提高OER性能的一种有效策略.
- 通过Fe优先占用四面体位,优化了高级催化物的电子结构.
- 开发的NiCoFe氧化物催化剂的性能优于基于Ni-Co的先进催化剂.
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