物理化学学报 >> 2024, Vol. 40 >> Issue (6): 2306013.doi: 10.3866/PKU.WHXB202306013

所属专题: 电化学前沿

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调控双钙钛矿中高熵组分促进高温析氧反应

冯炜程1,2,†, 于景成1,2,†, 杨溢澜3, 郭宜阁1,2, 邹庚1,2, 刘晓菊4, 陈洲5, 董坤6, 宋月锋1,*, 汪国雄1,*, 包信和1   

  1. 1 中国科学院大连化学物理研究所, 催化基础国家重点实验室, 洁净能源国家实验室, 辽宁 大连 116023
    2 中国科学院大学能源学院, 北京 100049
    3 大连交通大学环境与化学工程学院, 辽宁 大连 116028
    4 榆林学院化学化工学院, 陕西 榆林 719100
    5 厦门大学材料学院, 福建 厦门 361005
    6 中国科学院过程工程研究所, 离子液体清洁过程北京市重点实验室, 多相复杂系统国家重点实验室, 北京 100190
  • 收稿日期:2023-06-05 修回日期:2023-07-31 录用日期:2023-07-31 发布日期:2023-11-29
  • 通讯作者: Email: songyf2014@dicp.ac.cn (宋月锋)wanggx@dicp.ac.cn; Tel.: +86-411-84379976 (汪国雄)
  • 作者简介:

    †These authors contributed equally to this work.

  • 基金资助:
    国家重点研发计划(2021YFA1502400); 国家自然科学基金(22272176); 国家自然科学基金(22002166); 国家自然科学基金(22125205); 国家自然科学基金(22072146); 国家自然科学基金(22002158); 中国科学院洁净能源创新研究院合作基金(DNL202007); 榆林学院-中国科学院洁净能源创新研究院联合基金(YLU-DNL Fund 2022008); 中国科学院青年创新促进计划(Y201938)

Regulating the High Entropy Component of Double Perovskite for High-Temperature Oxygen Evolution Reaction

Weicheng Feng1,2, Jingcheng Yu1,2, Yilan Yang3, Yige Guo1,2, Geng Zou1,2, Xiaoju Liu4, Zhou Chen5, Kun Dong6, Yuefeng Song1,*, Guoxiong Wang1,*, Xinhe Bao1   

  1. 1 State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, China
    2 College of Energy, University of Chinese Academy of Sciences, Beijing 100049, China
    3 School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, China
    4 School of Chemistry and Chemical Engineering, Yulin University, Yulin 719100, Shannxi Province, China
    5 College of Materials, Xiamen University, Xiamen 361005, Fujian Province, China
    6 Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2023-06-05 Revised:2023-07-31 Accepted:2023-07-31 Published:2023-11-29
  • Contact: Email: songyf2014@dicp.ac.cn (Yuefeng Song)wanggx@dicp.ac.cn; Tel.: +86-411-84379976 (Guoxiong Wang)
  • Supported by:
    the National Key R & D Program of China(2021YFA1502400); the National Natural Science Foundation of China(22272176); the National Natural Science Foundation of China(22002166); the National Natural Science Foundation of China(22125205); the National Natural Science Foundation of China(22072146); the National Natural Science Foundation of China(22002158); the DNL Cooperation Fund, CAS(DNL202007); the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2022008); the CAS Youth Innovation Promotion(Y201938)

摘要:

固体氧化物电解池(SOEC)中阳极析氧反应动力学较为迟缓,限制了SOEC器件电催化转化能力,因此针对阳极材料的改性研究对于进一步提升SOEC电化学性能十分关键。高熵钙钛矿(HEP)在许多反应中表现出良好的催化活性,但在SOEC中的应用鲜有研究。本文通过在双钙钛矿的A位或Aʹ位分别掺杂不同的稀土金属、碱土金属或碱金属离子,合成了(Pr0.2La0.2Sm0.2Nd0.2Gd0.2)BaCo2O6−δ (A-HEP)和Pr(Ba0.2Sr0.2Ca0.2Na0.2K0.2)Co2O6−δ (Aʹ-HEP)两种高熵钙钛矿材料。由于掺杂离子平均半径和氧化态的差异,A-HEP保持四方双钙钛矿相结构而Aʹ-HEP则转变为正交单钙钛矿相。物理化学表征结果表明,A-HEP中Co平均价态更高,Co 2p-O 1s杂化更强,从而增加了电子转移路径并降低了转移能垒。同时,A-HEP中表面氧空位浓度更高,可为阳极析氧反应提供更多的活性位点。因此,在具有A-HEP阳极的SOEC中,与氧输运、电子传输和表界面反应过程相关的阳极极化电阻显著降低,并在800 ℃下实现最高1.76 A∙cm−2的电流密度和200 h的稳定性。本工作为高熵钙钛矿材料在SOEC阳极中的应用提供了新的策略。

关键词: 固体氧化物电解池, 高熵钙钛矿, 析氧反应, 氧空位, 电子转移

Abstract:

Solid oxide electrolysis cells (SOECs) could convert CO2 to CO powered by clean electricity with low overpotential, high Faradaic efficiency, and high current density. Since the performance of SOEC is affected by sluggish oxygen evolution reaction (OER) kinetics at the anodes, the modification of anode materials is crucial for the further application of SOEC. Perovskites with high configurational entropy exhibit high catalytic activity in many reactions, but are rarely reported in SOECs. Herein, two kinds of high entropy perovskites (HEPs), with formulas of (Pr0.2La0.2Sm0.2Nd0.2Gd0.2)BaCo2O6−δ (A-HEP) and Pr(Ba0.2Sr0.2Ca0.2Na0.2K0.2) Co2O6−δ (A′-HEP), are synthesized by doping different rare earth metal, and alkaline metal or alkaline earth metal ions into A-site and A′-site of the double perovskites. Rietveld refinement of X-ray diffraction patterns and elemental maps of scanning electron microscope images confirm the successful synthesis of the two samples. The tetragonal double perovskite structure of A-HEP and the transformation to orthorhombic structure of A′-HEP due to the difference in average atomic radii and oxidation states of the doped ions are also detected. Co 2p X-ray photoelectron spectroscopy (XPS) and O K-edge X-ray absorption spectroscopy reveal that the average oxidation state of Co is lifted from +3.23 in Aʹ-HEP to +3.39 in A-HEP, and the hybridization of Co 2p and O 1s orbitals is also enhanced in A-HEP, which increase the electron transfer pathway and reduce the transfer barrier. Therefore, the electrical conductivity of A-HEP at 800 ℃ is higher than that of Aʹ-HEP. Moreover, the increased absorption oxygen species concentration of A-HEP in O 1s XPS and O2-temperature programmed desorption results indicates more surface oxygen vacancies, thus increasing active sites for the anodic OER. Consequently, the anodic polarization resistances related to oxygen transportation, electron transfer and surface reaction processes are decreased remarkably in A-HEP, resulting in a high current density of 1.76 A∙cm−2 at 800 ℃ and a stability of 200 h. This work presents a new method for designing high-performance HEPs as SOEC anode materials.

Key words: Solid oxide electrolysis cell, High entropy perovskite, Oxygen evolution reaction, Oxygen vacancy, Electron transfer