在电化学氧气进化过程中,NiFe双层双氧化物催化剂能否抑制碳腐蚀?
Yuki Takaki1, Manabu Ishizaki1, Takashi Nakamura2
1Faculty of Science, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, Yamagata 990-8560, Japan.
ACS applied materials & interfaces
|December 13, 2024
概括
这项研究开发了一种用于可充电的空气电池的新催化剂,使用碳纳米管上的铁层双氧化物纳米点. 这种方法大大减少了能量损失,并防止了电极腐蚀,为高效,可持续的电池铺平了道路.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 可持续能源需要可充电电池,使用地球上丰富,地缘政治稳定的材料.
- 可充电Zn-空气电池 (r-ZAB) 中的气体扩散电极 (GDE) 遭受碳腐蚀,限制电池寿命.
- 开发高效的氧化演化反应 (OER) 催化剂对于r-ZABs的低超电位运行至关重要.
研究的目的:
- 为r-ZABs设计低超电位的OER催化剂,以减轻GDE中的碳腐蚀.
- 使用单壁碳纳米管 (SWNTs) 作为无兴奋剂NiFe层双氧化物 (NiFeLDH) 催化剂的支架.
- 使用普鲁士蓝模拟纳米颗粒来控制NiFeLDHs的原子层组成.
主要方法:
- 合成的普鲁士蓝模拟纳米粒子 (NixFe1-x[Fe(CN) 6]0.67) 具有受控的金属组成.
- 制造的GDE模型通过滴滴造~8nm纳米粒子到碳纸上的SWNT.
- 化Ni0.6Fe0.4[Fe(CN)6]0.67以产生小的NiFeLDH纳米点 (1.75 ± 0.26nm) 暴露的OER活性平面.
- 优化了催化剂负载 (270 nmol cm-2) 以最大限度地减少聚合和超电位.
主要成果:
- 在10 mA cm-2的最佳催化剂负载下,实现了156 mV的低iR校正的OER超电位.
- 证明了SWNT和碳黑的抑制碳腐蚀,其未经纠正的260mV的超电位.
- 成功运行了一个r-ZAB半电池,显示稳定充电10mA cm-2 3小时,平均电压为1.99V与Zn/Zn2+.
结论:
- 在SWNT上的无兴奋剂NiFeLDH纳米点为r-ZAB中高效的OER催化提供了一个有希望的途径.
- 控制纳米粒子的组成和尺寸是实现高活性和稳定性的关键.
- 基于碳的电极仍然有可能在没有使用兴奋剂的情况下发现内在活性的OER催化剂.
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