对于高效的异质电催化OER,Keggin POM具有独特的活性
Chandani Singh1,2, Dan Meyerstein2,3, Zorik Shamish4
1Department of Chemical Engineering, Sami Shamoon College of Engineering, Beer-Sheva, Israel.
iScience
|April 10, 2024
概括
这项研究将含有的聚氧甲酸盐 (POM) 入sol-gel矩阵中,以实现高效的电化学水氧化. 由此产生的异质催化剂在酸性条件下表现出卓越的稳定性和活性.
科学领域:
- 无机化学 无机化学 有机化学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 聚氧甲酸盐 (POMs) 在水氧化催化方面得到了广泛的研究.
- POMs的高溶解度限制了它们在同质系统中的应用.
- 异质化策略对于提高POM稳定性和可回收性至关重要.
研究的目的:
- 开发一种稳定且可回收的异质催化剂,用于电化学氧化水.
- 为了研究Keggin型聚氧甲酸盐K[CoW12O40) 的催化性能,被困在sol-gel矩阵中.
- 评估催化剂在酸性介质中的活性和稳定性.
主要方法:
- 在sol-gel矩阵中捕获K[CoW12O40]以形成异质电极.
- 氧化演化反应 (OER) 索尔凝捕获催化剂的电化学表征.
- 对催化性能进行评估,包括超电位,电流密度和转换频率 (TOF).
主要成果:
- 被困在K[CoW12O40]中的sol-gel有效地催化了pH2.0的氧气演化反应.
- 不同质的电极在电化学条件下表现出强度和稳定性.
- 在300 mV的低超电位下,达到2 mA/cm2的电流密度.
- 证明了1.76mol O2 (mol Co) -1s-1.1的高周转频率 (TOF).
结论:
- 溶凝捕获是一种有效的POM异质化方法,可以提高其稳定性和可回收性.
- 基于K[CoW12O40]的sol-gel电极是酸性环境中电化学氧化水的有希望的催化剂.
- 该研究提出了电催化水氧化过程的可信机制.
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