通过Fe-Co-Ni-P电催化剂对Fe-Co-Ni-P电催化剂的整体水分裂反应进行实验和计算洞察
Lakshya Kumar1, Bindu Antil1, Ankur Kumar1
1Nanochemistry Laboratory, Department of Chemistry, University of Delhi, North campus, Delhi 110007, India.
ACS applied materials & interfaces
|November 16, 2023
概括
非贵金属过渡金属化物 (TMP) 显示出作为水分裂的电催化剂的前景. 这项研究开发了基于Fe,Co和Ni的TMP,可以有效催化和氧的进化反应,证明了对整体水分裂的优异耐用性和活性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 非贵金属过渡金属化物 (TMP) 具有适用于能量转化催化剂的调节性质.
- 尽管有潜力,但TMPs对水分化的催化机制仍未得到充分探索.
- 高效的电催化剂对于水分和氧气演化反应 (HER,OER) 在水分裂中至关重要.
研究的目的:
- 合成和描述新型TMP纳米粒子 (Fe,Co,Ni) 作为电催化剂.
- 调查这些TMP在性介质中对HER,OER和整体水分解的催化性能.
- 阐明表面化学和控制它们的催化活性的反应机制.
主要方法:
- 单分散的尖球形TMP纳米粒子 (Fe,Co,Ni) 的合成.
- 对HER,OER和整体水分裂的催化活性进行电化学评估.
- 表面化学分析和密度函数理论 (DFT) 计算用于机械洞察力.
主要成果:
- 优化的Fe0.5CoNi0.5P催化剂表现出优越的HER和OER活动,其特点是低的超潜和Tafel斜率.
- 在KOH中,Fe0.5CoNi0.5P使之能使Fe0.5CoNi0.5P电解剂在低电池电压下 (1.52-1.56V) 达到10mA cm-2的效果,其性能优于商业催化剂.
- 观察到异常耐用性 (高达70小时,5000个周期) 和高电流密度 (1000 mA cm-2),表明有效的双功能电催化.
结论:
- 在性介质中的表面重建形成活性物种,以低激活能量增强OER性能.
- 有效的HER归因于物种的热中性吸附.
- 这些TMP代表了一类有前途的双功能电催化剂,用于高效且持久的水分解.
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