Electrocatalytic Oxidative Coupling of Methane on NiFe Exsolved Perovskite Anode: Effect of Water
Electrocatalytic Oxidative Coupling of Methane on NiFe Exsolved Perovskite Anode: Effect of Water
复制标题
甲烷在 NiFe 溶解的钙钛矿阳极上的电催化氧化偶联：水的影响
DOI：
10.1002/cctc.202201336
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发表时间：
2023
期刊：
影响因子：
4.5
通讯作者：
Ozkan, Umit S.
中科院分区：
文献类型：
--
作者：
Kim, Jaesung;Ferree, Matthew;Gunduz, Seval;Millet, Jean‐Marc M.;Aouine, Mimoun;Co, Anne C.;Ozkan, Umit S.
甲烷的氧化偶联（OCM）可以通过使用固体氧化物电池进行电催化，固体氧化物电池通过致密的电解质提供易于控制的氧气供应。La0.7Sr0.2Ni0.2Fe0.8O3（LSNF）钙钛矿是一种有效的OCM阳极。通过还原和由此产生的双金属NiFe纳米颗粒从其本体中析出，可以改善其表面特性和电催化活性。X射线衍射（XRD）和环境透射电镜证实了在还原环境下异相的演化导致表面形成双金属NiFe纳米颗粒。由于溶解的NiFe纳米颗粒减少了LSNF， C2+烃产量提高了36%。H2O的共进料增强了ch4的选择性转化，使C2+烃的产率提高了56%。CH4+H2O气氛下的阻抗谱和原位漂移分析为电催化OCM的增强提供了理解。
Oxidative coupling of methane (OCM) can be performed electrocatalytically by utilizing solid oxide cells, which provide a readily controlled oxygen supply through dense electrolytes. La0.7Sr0.2Ni0.2Fe0.8O3(LSNF) perovskite is an effective anode for OCM. Its surface characteristics and electrocatalytic activity can be improved by reduction and the resultant exsolution of bimetallic NiFe nanoparticles from its bulk. X‐ray diffraction (XRD) and environmental transmission electron microscopy proved that the evolution of hetero‐phases under reducing environment resulted in bimetallic NiFe nanoparticles being formed on the surface. A 36 % improvement in C2+hydrocarbon production rate was achieved due to the reduction of LSNF with the exsolved NiFe nanoparticles. Co‐feeding of H2O enhanced selective conversion of CH4resulting in the production rate of C2+hydrocarbons being increased by 56 %. Analysis of impedance spectra and in‐situ DRIFTS under a CH4+H2O atmosphere provided an understanding for the enhancement on the electrocatalytic OCM.