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在添加碳布上的超微小的化物纳米粒子,用于高效且持久的酸性水分裂

Yingying Xu¹, Yiru Wang¹, Jinjie Qian¹

¹Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou 325035, China. zxm.mei@163.com.

Chemical communications (Cambridge, England)

|September 16, 2025

概括

在添加碳布上的超微小的化物纳米粒子显示了在酸性条件下演化反应 (HER) 和氧演化反应 (OER) 的超高潜力创下历史新低. 这种催化剂表现出极好的稳定性,性能优于氧化物和氧化物基准.

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
纳米技术纳米技术

背景情况:

高效的电催化剂对于水分技术至关重要.
(Pt) 和氧化 (IrO2) 是常见的基准,但面临成本和稳定性限制.
添加碳材料为催化提供了独特的电子特性.

研究的目的:

开发在添加碳布 (N-CC) 上支持的超微小的纳米粒子 (Ir),以增强电催化活性.
评估Ir/N-CC在酸性介质中的演化反应 (HER) 和氧演化反应 (OER) 的性能.
评估开发的催化剂的长期稳定性.

主要方法:

在N-doped碳布上支持的超小Ir纳米颗粒的合成 (Ir/N-CC).
在酸性条件下对HER和OER的Ir/N-CC的电化学表征.
在10 mA cm-2的电流密度下,在2000小时内对催化剂进行稳定性测试.
基于Ir/N-CC的电解器的制造和测试.

主要成果:

在酸性介质中,Ir/N-CC为HER (12mV) 和OER (210mV) 实现了创纪录的低超电位.
催化剂表现出极好的长期稳定性,在10 mA cm-2下运行2000小时.
一个Ir/N-CC‖Ir/N-CC电解器在1.49V的电压下有效地运行了10mA cm-2.
发现剂可以优化OH/OOH吸附,增强催化动力学.

结论:

在N-doped碳布上的超小Ir纳米颗粒代表了HER和OER的高效和稳定的电催化剂.
性能超过了当前的Pt/C和IrO等基准,这表明酸性水电解的巨大潜力.
由N-dopants促进的优化吸附是增强催化活性的关键.

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