高度CoNi-C接口,用于高效的性气演变
Daoui Wang1, Shuo Wang1, Weihao Liao1
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum-, Beijing 102249, China.
这项研究引入了一种新的CoNi合金-碳电极,用于高效的性演变反应 (HER). 新设计最大限度地提高了接口度,促进了的生产,并为水电解剂提供了特殊的稳定性.
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:
- 高效的演化反应 (HER) 对可持续能源技术至关重要.
- 传统的金属-碳接口通常具有低度,限制了催化活性.
- 开发提高接口密度的策略是提高 HER 性能的关键.
研究的目的:
- 设计一个具有高度CoNi合金-碳接口的自承载电极.
- 调查前体尺寸工程对金属分散和接口密度的影响.
- 在性介质和离子交换膜水电解剂 (AEMWE) 中评估开发电极的 HER 性能和稳定性.
主要方法:
- 采用ZIF-67的电解与Ni(NO3) 2和三酸合成可调节的Co,Ni含有三酸 (Co$_{x}$Ni-BTC) 前体.
- 前体的热解以形成控制界面度的Co$_{x}$Ni-C/NF电极.
- HER性能 (超电位,Tafel斜率) 的电化学表征和长期稳定性测试.
- 密度函数理论 (DFT) 计算以阐明增强 HER 的机制.
主要成果:
- 通过前体尺寸工程,在泡 (Co$_{x}$Ni-C/NF) 上实现了高度缩的CoNi-碳接口 (高达4%).
- Co$_{50Ni-C/NF电极在1M KOH中表现出极好的HER性能:低超电位 (30 mV cm$^{-2}$在10 mA cm$^{-2}$),Tafel斜率 (45.1 mV dec$^{-1}$) 和72小时的稳定性.
- 在AEMWE中,Ni-C/NF Co$_{50}/NF 系统在1.93 V下达到0.5 A cm$^{-2}$,并在0.2 A cm$^{-2}$下保持100小时的稳定性.
结论:
- 开发的具有高度接口的CoNi-C/NF电极显著提高了性HER的性能和耐用性.
- 前体尺寸工程是一种有效的策略,用于控制催化剂中的金属分散和接口密度.
- DFT计算证实,密集的接口提高了导电性,水吸附性和进化动力学,为先进的HER电极提供了一个有前途的路线.
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