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在多壁碳纳米管上的NiO-NiMoO₄纳米复合材料作为有效的双功能电催化剂,用于全水分裂

Qi Xue¹, Yun Wu¹, Jinbo Hao¹

¹School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

ACS applied materials & interfaces

|June 22, 2023

概括

这项研究介绍了一种新的NiO-NiMoO4纳米复合物在碳纳米管上用于增强电催化. 该材料在氧进化和进化反应中都表现出卓越的性能,证明了其双功能催化潜力.

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:

过渡金属氧化物是关键的电催化剂,但它们的活性可能受到限制.
协同调节和缺陷工程是改善电催化性能的有效策略.
开发高效的双功能电催化剂用于水分离对于可再生能源技术至关重要.

研究的目的:

为了合成和表征一种新的NiO-NiMoO4纳米复合材料,支持多壁碳纳米管 (NiO-NiMoO4/mCNTs).
评估NiO-NiMoO4/mCNTs在氧演化反应 (OER) 和演化反应 (HER) 的电催化活性.
调查协同效应和潜在机制,有助于增强双功能电催化性能.

主要方法:

NiO-NiMoO4/mCNTs纳米复合物的两步合成.
使用技术确认结构,表面积和缺陷 (例如氧气空缺) 的物理表征.
对OER和HER性能进行电化学测试,包括超电位,启动电位和Tafel斜率测量.
密度函数理论 (DFT) 计算以了解反应机制和能量障碍.

主要成果:

NiO-NiMoO4/mCNTs表现出一个明确的结构,具有高的特定表面积和丰富的氧气空缺.
与单个组件和商业RuO2.2相比,纳米复合材料对OER的过度潜力明显较低.
NiO-NiMoO4/mCNTs显示出优越的HER活性,具有最小的开始潜力和最低的Tafel斜率.
DFT的计算证实了纳米复合材料表面对HER和OER中间体的改变吸附能量和降低能量障碍.
使用NiO-NiMoO4/mCNTs的对称水电解仪在1.57V的低电池电压下实现了10 mA cm-2.

结论:

NiO,NiMoO4和mCNT之间的协同作用,以及缺陷工程,导致了卓越的双功能电催化活性.
NiO-NiMoO4/mCNTs代表了一种有前途的先进电催化剂,用于高效的水分应用.
开发的材料提供了一条通往具有成本效益和高性能电化学能量转换装置的途径.

关键词:

气演化反应反应的反应氧气进化反应反应氧气进化反应有空缺的氧气位.有协同效应的效应.过渡金属氧化物过渡金属氧化物

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