和-碳-化物强合支持增强酸性水氧化
Xueru Zhao1, Tianyou Mou1, Jesse Long1
1Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States.
新的-碳-化物 (BCN) 支持的 (Ir) 催化剂在酸性条件下显著提高了氧化演化反应 (OER) 的性能. 伊尔/BCN-75催化剂在质子交换膜水电解 (PEMWE) 中表现出卓越的活性和稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 基于 (Ir) 的材料对于酸性介质中的氧化演化反应 (OER) 是至关重要的.
- 在稳定的基板上支持Ir提高了催化性能和耐用性.
- 恶劣的酸性环境对OER催化剂构成重大挑战.
研究的目的:
- 开发支持碳化物 (BCN) 的新型催化剂,以改善开放式反应率.
- 研究Ir纳米颗粒 (NP) 与NCB支持之间的相互作用.
- 在半细胞和质子交换膜水电解 (PEMWE) 试验中评估Ir/BCN催化剂的性能.
主要方法:
- 一系列Ir/BCN催化剂的合成.
- 使用实验技术进行表征.
- 密度函数理论 (DFT) 计算以了解催化剂-支持相互作用.
- 在半电池和PEMWE中进行电化学测试.
主要成果:
- 观察到IRNP与NCB支持之间存在强烈的相互作用.
- 与商业的Ir黑和IrO2相比,Ir/ BCN- 75表现出更高的OER活性和稳定性.
- 在PEMWE中,Ir/BCN-75在1.9V下实现了2.94A cm-2的高电流密度,且IR负载低 (0.26 mg cm-2).
- 伊尔-N债券影响了伊尔-NP的增长和活动,而伊尔-B债券则提高了稳定性.
结论:
- 通过NCB的支持,有效地提高了OER的催化性能.
- /BCN催化剂是高效和稳定的水电解的有希望的替代品.
- 强大的金属支相互作用是优化基于Ir的OER电催化剂性能的关键.
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