Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Iron-Locked Hydr(oxy)oxide Catalysts via Ion-Compensatory Reconstruction Boost Large-Current-Density Water Oxidation
Advanced Science ( IF 14.3 ) Pub Date : 2023-04-07 , DOI: 10.1002/advs.202300717 Jiao Liu 1 , Wei Du 1 , Siying Guo 1 , Jing Pan 1 , Jingguo Hu 1 , Xiaoyong Xu 1
Advanced Science ( IF 14.3 ) Pub Date : 2023-04-07 , DOI: 10.1002/advs.202300717 Jiao Liu 1 , Wei Du 1 , Siying Guo 1 , Jing Pan 1 , Jingguo Hu 1 , Xiaoyong Xu 1
Affiliation
|
Nickel-iron based hydr(oxy)oxides have been well recognized as one of the best oxygen-evolving catalysts in alkaline water electrolysis. A crucial problem, however, is that iron leakage during prolonged operation would lead to the oxygen evolution reaction (OER) deactivation over time, especially under large current densities. Here, the NiFe-based Prussian blue analogue (PBA) is designed as a structure-flexible precursor for navigating an electrochemical self-reconstruction (ECSR) with Fe cation compensation to fabricate a highly active hydr(oxy)oxide (NiFeOxHy) catalyst stabilized with NiFe synergic active sites. The generated NiFeOxHy catalyst exhibits the low overpotentials of 302 and 313 mV required to afford large current densities of 500 and 1000 mA cm−2, respectively. Moreover, its robust stability over 500 h at 500 mA cm−2 stands out among the NiFe-based OER catalysts reported previously. Various in/ex situ studies indicate that the Fe fixation by dynamic reconstruction process can reinforce the Fe-activated effect on the OER amenable to the industrial-level large current conditions against the Fe leakage. This work opens up a feasible strategy to design highly active and durable catalysts via thermodynamically self-adaptive reconstruction engineering.
中文翻译：
铁锁羟基氧化物催化剂通过离子补偿重构促进大电流密度水氧化
镍铁基羟基氧化物已被公认为碱性水电解中最好的析氧催化剂之一。然而，一个关键问题是，长时间运行期间的铁泄漏会导致析氧反应（OER）随着时间的推移而失活，特别是在大电流密度下。在这里，基于 NiFe 的普鲁士蓝类似物 (PBA) 被设计为结构灵活的前体，用于通过 Fe 阳离子补偿进行电化学自重构 (ECSR)，以制造高活性的氢（氧）氧化物 (NiFeO x H y )具有Ni - Fe协同活性位点稳定的催化剂。生成的NiFeO x H y催化剂表现出分别提供500和1000 mA cm -2的大电流密度所需的302和313 mV的低过电势。此外，其在500 mA cm -2下超过500小时的稳健稳定性在之前报道的NiFe基OER催化剂中脱颖而出。各种原位/异位研究表明，通过动态重建过程固定 Fe 可以增强 Fe 激活对 OER 的影响，适合工业级大电流条件以防止 Fe 泄漏。这项工作开辟了一种通过热力学自适应重构工程设计高活性和耐用催化剂的可行策略。
更新日期：2023-04-07
中文翻译：
铁锁羟基氧化物催化剂通过离子补偿重构促进大电流密度水氧化
镍铁基羟基氧化物已被公认为碱性水电解中最好的析氧催化剂之一。然而，一个关键问题是，长时间运行期间的铁泄漏会导致析氧反应（OER）随着时间的推移而失活，特别是在大电流密度下。在这里，基于 NiFe 的普鲁士蓝类似物 (PBA) 被设计为结构灵活的前体，用于通过 Fe 阳离子补偿进行电化学自重构 (ECSR)，以制造高活性的氢（氧）氧化物 (NiFeO x H y )具有Ni - Fe协同活性位点稳定的催化剂。生成的NiFeO x H y催化剂表现出分别提供500和1000 mA cm -2的大电流密度所需的302和313 mV的低过电势。此外，其在500 mA cm -2下超过500小时的稳健稳定性在之前报道的NiFe基OER催化剂中脱颖而出。各种原位/异位研究表明，通过动态重建过程固定 Fe 可以增强 Fe 激活对 OER 的影响，适合工业级大电流条件以防止 Fe 泄漏。这项工作开辟了一种通过热力学自适应重构工程设计高活性和耐用催化剂的可行策略。
京公网安备 11010802027423号