由单原子驱动的水辅助酸性水分裂
Fang Luo1, Shuyuan Pan2, Yuhua Xie2
1College of Materials Science and Engineering, State Key Laboratory of New Textile Materials & Advanced Processing Technology, Wuhan Textile University, Wuhan, 430200, P. R. China.
这项研究引入了单原子催化剂 (Ir-SA/NC),用于高效的氧化反应 (HzOR) 和演化反应 (HER) 催化. 使用Ir-SA/NC的素辅助水分裂需要显著降低电压,并显示出增强的稳定性.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 生产的水分离通常需要高电压 (>1.5V),限制了单原子催化剂的稳定性,特别是在酸性介质中.
- 氧进化反应 (OER) 是由于高过电位和稳定性问题而导致水分裂的瓶.
- 用氧化反应 (HzOR) 代替OER可以降低整体电压要求.
研究的目的:
- 为了研究进化反应 (HER) 和hzOR.支持添加碳 (Ir-SA/NC) 的单原子催化剂的有效性.
- 评估Ir-SA/NC在酸性电解质 (0.5M H2SO4) 中的稳定性和活性.
- 为了阐明HzOR在Ir-SA/NC上的反应路径.
主要方法:
- 合成和描述Ir-SA/NC电催化剂的方法.
- 在0.5M H2SO4.4 中对HER和HzOR进行电化学测量.
- 在现场进行拉曼光谱,研究HzOR机制.
主要成果:
- 伊尔-SA/NC表现出HER在50mV超电位时的37.02A mgIr-1的高质量活性,比Pt/C高127倍.
- 对于HzOR,Ir-SA/NC在0.39V与RHE的低电位下达到10mA cm−2,明显低于OER (1.5V与RHE).
- 与0.5V的Pt/C相比,Ir-SA/NC在HzOR催化中表现出卓越的稳定性和83倍的增强质量活性,而RHE则是0.5V.
结论:
- 在酸性介质中,Ir-SA/NC是HER和HzOR的强大的电催化剂.
- 使用Ir-SA/NC的氨酸辅助水分裂在大幅降低的电压 (0.39V) 上运行,与酸性水分裂相比,可节省1.25V.
- 在Ir-SA/NC上提出的HzOR路径涉及N2H4 →*2NH2 →*2NH→2N→*N2 →N2.
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