近日，兰州大学席聘贤团队研究了千瓦级碱性海水电解槽的稀土防腐。2025年5月6日出版的《美国化学会杂志》发表了这项成果。

高电流密度下阳极OH^-消耗引起的Cl^-竞争吸附是制约碱性海水电解槽（ASWE）发展的重要因素。研究组提出了一种稀土防腐策略，该策略利用不参与反应的氧友好稀土来吸附OH，并保持ASWE中稳定阳极催化的表面环境。采用微分电化学质谱（DEMS）和电化学石英晶体微天平（EQCM）来鉴定传统镍网大电流阳极板上氯腐蚀的原因。使用氯离子荧光探针、旋转环盘电极（RRDE）标记的N-乙氧羰基甲基-6-甲氧基溴化喹啉鎓（MQAE）的原位荧光光谱和时间分辨吸收光谱来测试稀土的识别机制。

Eu₂O₃吸附OH^-以维持高电流pH环境，并抑制Cl^-吸附氧化，从而在500mA cm^-2电流密度下表现出超过1000小时的稳定性。此外，Eu₂O₃/FeNi₂S₄在17个总面积为1081.5 cm²的腔室中组装成千瓦级ASWE，并在80°C和30%KOH的工业条件下，在500 mA cm^-2的电流密度下稳定运行100多小时。技术经济分析（TEA）表明，稀土防腐策略可以提高ASWE的使用寿命，降低制氢成本，实现海水制氢盈利，为解决ASWE中的氯氧化腐蚀问题提供了一种新方法。

附：英文原文

Title: Corrosion Protection of Rare Earth for Kilowatt-Level Alkaline Seawater Electrolyzer

Author: Wei Shen, Yizhen Ye, Yang Hu, Huiying Wu, Qiujin Xia, Haodian Xie, Zijun Li, Nan Zhang, Li An, Rui Si, Pinxian Xi, Chun-Hua Yan

Issue&Volume: May 6, 2025

Abstract: The competitive adsorption of Cl– caused by anode OH– consumption under high current density is an important factor restricting the development of an alkaline seawater electrolyzer (ASWE). Here, we propose a strategy for rare earth corrosion protection which utilizes oxygen friendly rare earths that do not participate in the reaction to adsorb OH– and maintain the surface environment for stable anodic catalysis in an ASWE. Differential electrochemical mass spectrometry (DEMS) and electrochemical quartz crystal microbalance (EQCM) were used to identify the causes of chlorine corrosion on the high current anode plate of traditional Ni mesh. In situ fluorescence spectra of N-ethoxycarbonylmethyl-6-methoxyquinolinium bromide (MQAE) labeled with a chloride ion fluorescence probe, a rotating ring disk electrode (RRDE), and a time-resolved absorption spectrum were used to test the recognition mechanism of rare earth. Eu2O3 adsorbs OH– to maintain a high current pH environment and inhibits Cl– adsorption oxidation, thereby exhibiting stability for over 1000 h at 500 mA cm–2 current density. Furthermore, Eu2O3/FeNi2S4 was assembled into a kilowatt-level ASWE in 17 chambers with a total area of 1081.5 cm2 and operated stably for over 100 h at a current density of 500 mA cm–2 under industrial conditions of 80 °C and 30% KOH. Technical economic analysis (TEA) indicates that the rare earth corrosion protection strategy can enhance the service life of ASWE and reduce the cost of hydrogen production for profitable seawater hydrogen production, providing a new approach to solve the chlorine oxidation corrosion problem in an ASWE.

DOI: 10.1021/jacs.5c02876

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c02876