构建和增强内置电场,以实现高效的氧化演化反应
Jie Wu1, Anqi Huang1, Huan Hu1
1Key Laboratory of the Ministry of Education for Advanced Catalysis Material, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China.
Journal of colloid and interface science
|July 1, 2024
概括
研究人员通过使用异质连接在铁层双中创建内置电场 (BIEF) 来提高氧化演化反应 (OER) 的电催化剂性能. Ag@S/NiFe-LDH催化剂表现出卓越的开放式电源活性和耐用性.
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:
- 内置电场 (BIEF) 对于优化电催化剂性能至关重要,特别是在氧化演化反应 (OER) 中.
- 铁层双氧化物 (NiFe-LDH) 是一个有前途的电催化剂,但通过操纵其电子结构,可以进一步提高其效率.
- 异质连接工程为先进的催化应用构建和增强BIEF提供了一条途径.
研究的目的:
- 通过在现场的异质连接转换构建和增强BIEF来制定调节NiFe-LDH电子结构的策略.
- 为了合成和描述Ag2S@S/NiFe-LDH (p-n异质连接) 和Ag@S/NiFe-LDH (Mott-Schottky异质连接) 的电催化剂.
- 调查不同异质连接对OER性能的影响,并了解潜在的机制.
主要方法:
- Ag2S@S/NiFe-LDH和Ag@S/NiFe-LDH异构结构的合成.
- 对OER性能进行电化学表征,包括超电位和Tafel斜率测量.
- 密度函数理论 (DFT) 计算分析BIEF,界面电子相互作用和反应动力学.
主要成果:
- Ag@S/NiFe-LDH是一种Mott-Schottky异质连接,与p-n异质连接相比,具有更高的OER性能.
- Ag@S/NiFe-LDH催化剂在1M KOH中在100mA cm-2下实现了232mV的低超电位,Tafel斜率为73mV dec-1.
- 在Ag@S/NiFe-LDH催化剂中观察到优异的电催化耐用性.
- DFT的计算证实,在Mott-Schottky异质连接中更强的BIEF增强了界面电子相互作用,并加速了OER动力学.
结论:
- 构建Mott-Schottky异质连接是一种有效的策略,可以显著提高NiFe-LDH电催化剂中的BIEF.
- 增强的BIEF促进了高效的电子转移,并降低了OER的速率决定步骤的能量障碍.
- 这种方法为设计高性能电催化剂提供了可行的途径,并提供了定制的BIEF,以提高OER活动和耐用性.
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