在单个原子上动态离子吸附增加了海水氧化催化剂的作用
Xinxuan Duan1,2, Qihao Sha1, Pengsong Li3
1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, PR China.
Nature communications
|March 4, 2024
概括
一个新的原子催化剂在铁层双氧化物 (Ir/CoFe-LDH) 上,可以从海水中有效地生产绿色. 这种催化剂克服了阳极腐蚀的挑战,表现出优越的氧气进化反应活性和稳定性.
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
- 绿色化学 绿色化学
背景情况:
- 海水电解是绿色生产的一个有前途的途径.
- 阳极的化物 (Cl-) 腐蚀阻碍了海水电解的商业化.
研究的目的:
- 开发一种用于性海水电解的新型催化剂,以应对阳极腐蚀.
- 为了定制化物吸附和调节活性位点的电子结构.
主要方法:
- 在铁层双氧化物 (Ir/CoFe-LDH) 上合成原子催化剂.
- 使用操作特征和理论计算.
- 在性海水和无化物电解质中测试了催化剂的性能.
主要成果:
- 建立了一个独特的Ir-OH/Cl协调状态,该状态将氧演化反应 (OER) 激活能量降低1.93倍.
- 与无化物条件相比,Ir/CoFe-LDH在6M NaOH + 2.8M NaCl中表现出更高的OER活性 (202 mV超电位),而无化物条件 (236 mV超电位).
- 在高电流密度 (>1,000小时) 达到100%的催化选择性和稳定性.
结论:
- 开发的Ir/CoFe-LDH催化剂有效地减轻了海水电解中的阳极腐蚀.
- 独特的Ir-OH/Cl协调是提高催化性能和稳定性的关键.
- 这一进步为从海水中生产成本高效的绿色气铺平了道路.
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