实现用于储能的Ni (OH) 2纳米板中的两电子转移
Jianxin Kang1, Yufeng Xue2, Jie Yang1
1School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, Beijing 100191, China.
Journal of the American Chemical Society
|May 2, 2022
概括
研究人员在单层氧化物 (Ni(OH) 2纳米板中发现了双电子转移,显著提高了能量储存能力. 这一突破与传统的单电子转移形成鲜明对比,
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 电极材料的容量受氧化中心电子转移的限制.
- 多电子转移提供了更高的容量,但在动力学和热力学上具有挑战性.
- 传统的多层Ni ((OH) 2表现出一个电子转移.
研究的目的:
- 在单层Ni ((OH) 2纳米片中研究多电子转移.
- 了解阻碍/启动多电子转移的机制.
- 探索增强能源储存能力的可能性.
主要方法:
- 预测氧化还原过程的第一原理计算.
- 单层Ni ((OH) 2纳米片的实验合成
- 在现场进行实验,观察电化学变化.
主要成果:
- 单层Ni (OH) 2促进了两个电子的转移 (Ni 2+ → Ni 4+).
- 计算显示,由于键和Jahn-Teller扭曲,多层中的第二电子转移受到阻碍.
- 达到了576mA h/g的实验容量,几乎是单电子工艺的两倍.
- 在现场的研究证实了单层中的两电子转移和Ni4+形成.
结论:
- 原子薄的Ni (OH) 2可以实现一种新的两电子氧化还原机制.
- 单层结构克服了散装材料在多电子转移方面的局限性.
- 这项工作提供了一种通过调整电子传输数量来增加能量储存能力的策略.
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