水氧化和氧气的监测是用改性配氧化锡电极进行的
Caleb A Kent1, Javier J Concepcion, Christopher J Dares
1Department of Chemistry, CB# 3290, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
Journal of the American Chemical Society
|May 23, 2013
概括
用改性化物添加的氧化锡电极有效催化水的氧化. 这项研究确定了单点 (cobalt) 作为电催化水分裂的活性物种,实现了高周转率.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 电催化氧化水对于可再生能源技术至关重要.
- 化物合锡氧化物 (FTO) 是一种常见的电极材料.
- 了解活性位点是提高催化剂效率的关键.
研究的目的:
- 为了研究Co (II) 修饰的FTO电极上的电催化水氧化机制.
- 为了确定活性催化物种的性质.
- 为了评估修改过的电极的性能和稳定性.
主要方法:
- 使用 (Cobalt) 的FTO电极的表面修改(II).
- 用X射线光电子光谱 (XPS) 和传输电子显微镜 (TEM) 进行表面特征.
- 循环电压测量 (CV) 和控制电位电解用于电化学测量.
主要成果:
- 活性部位被确定为单位或小分子,而不是氧化物薄膜.
- 表面结合的二氧化物经历pH依赖的氧化到三氧化物,从而启动水氧化.
- 在1.61V与NHE (pH 7.2) 实现了持续的水氧化催化,每站2个小时内发生29000次转换.
- 旋转频率在800mV超电位时为4s-1.
- 使用纳米FTO电极,电流密度增加了大约5倍.
结论:
- 在FTO上的单位 (Cobalt) 物种是高效的电催化剂,用于氧化水.
- 催化过程涉及pH取决于CO2II/CO2III的氧化还原循环.
- 通过具有高表面积的纳米材料,可以进一步增强.
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