Advanced Energy Materials
·
2022
·Vol. 12
·期 22
·2200392
·
IF 29.698
Peng Zhong,Kazuaki Toyoura,Lulu Jiang,Lubing Chen,Sara Adeeba Ismail,Naoyuki Hatada,Truls Norby,Donglin Han
A significant hydration and protonic conduction in La 2 NiO 4+ δ -based Ruddlesden–Popper (RP) oxides will enable their use as positrode materials in proton ceramic electrochemical cells (PCECs). Unlike perovskite electrolytes and positrode materials, where protons reside and jump on regular oxide ions, RP oxides such as La 2 NiO 4+ δ may contain oxygen interstitials and offer the possibility that protons locate on and migrate by help of these, suggesting a mechanism by which positrodes may operate by triple conduction. Here, theoretical calculations that support proton migration between interstitial oxide ions in the rock-salt layer via unshared oxide ions in the perovskite layer are reported. Furthermore, water contents of pristine La 2 NiO 4+ δ and La 2- x A x NiO 4+ δ ( A = Ca, Sr, Ba) are reported, showing that hydration increases with the level and basicity of the dopant. Hebb-Wagner blocking electrode measurements show significant partial protonic conductivity in all samples. The effects of doping on hydration and of p H 2 O on the p-type conductivity suggest that protons reside primarily on structural oxide ion, but a role of interstitial oxide ions for dissolution and migration of protons cannot be ruled out in cases with oxygen excess. The results are instructive for further studies and optimization of RP oxides as potential positrode materials for PCECs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Lubing Chen,Guanchao Wang,Kazuaki Toyoura,Donglin Han
Oxygen-excess La 2 NiO 4+ δ (LNO) conducts oxide ions, electron holes, and hydroxide ions simultaneously on exposing to wet oxygen, exhibiting the potential as a cathode material in protonic ceramic fuel cells. Since the incorporation of protons in oxygen-excess LNO is via the hydration reaction assisted by interstitial oxide ions, in this work, the concentration of interstitial oxide ions is reduced and increased by substituting Ni with Cu and Co, respectively. A higher concentration of interstitial oxide ions leads to a high proton concentration, indicating the predominant role of interstitial oxide ions in the hydration reaction, different from that in the oxygen-deficient oxides, where protons are introduced by dissociative absorption of water molecules by oxygen vacancies. The theoretical calculation indicates that protons in Co-doped LNO prefer to locate between the interstitial oxide ions and unshared apical oxide ions. A trapping effect is found between protons and the oxide ions near Cu, leading to decreased proton mobility. Protonic conductivity at 400–575 °C is then directly measured by a Hebb–Wagner direct current polarization method with La 0.99 Ca 0.01 NbO 4− δ as the blocking electrode, enabling the observation that Co-doped LNO has the highest protonic conductivity among the samples studied in this work.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Jin Li,Qian Zhang,Peng Qiu,Lichao Jia,Bo Chi,Jian Pu,Jian Li
La 2 NiO 4+δ (LN)-coated PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) composite cathode, designated as PBSCF-LN, for the intermediate temperature solid oxide fuel cells (IT-SOFCs) is prepared by solution infiltration , and investigated comparatively with single phase PBSCF cathode in the half and full cells using Ag and/or Pt paste as the current collector. Compared with Pt, Ag current collector results in a decrease of cathode polarization resistance ( R P ) by an order of magnitude, which suggests that Ag is electrocatalytically active and not suitable for the use of studying the cathode performance of IT-SOFCs. The R P value of PBSCF-LN cathode is significantly lower than that of PBSCF cathode, no matter whether Pt or Ag current collector is used for the measurement. High power densities ranging from 0.24 to 0.94 W cm −2 at temperatures between 600 and 750 °C are achieved using a full cell with PBSCF-LN cathode. Upon exposure to a CO 2 -rich atmosphere, carbonate particles are formed on the surface of PBSCF cathode, causing irreversible degradation of electrochemical performance. In contrast, the surface of PBSCF-LN cathode remains clean, and its performance degradation due to CO 2 adsorption is recoverable.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yuwen Zhu,Shihang Guo,Jianqiu Zhu,Peng Du,Jie Pu,Linjuan Zhang,Donglin Han
Protonic ceramic fuel cells (PCFCs) are a promising hydrogen economy-oriented technique for energy conversion, but the performance of cathodes needs to be improved due to the sluggish oxygen reduction reaction kinetics. Post-annealing the AgNO 3 solution-infiltrated La 2 NiO 4+δ (LNO) backbones leads to the formation of Ag nanoparticles-decorated LNO composite cathodes, with the oxygen adsorption ability enhanced significantly at the interface between Ag and LNO. Although the acidity of the AgNO 3 solution results in a negative etching effect, it is compensated or even overcome by the enhanced catalytic activity by generating Ag nanoparticles on the surface of LNO. Notably, LNO loaded with 1 wt% Ag achieves the optimal balance, showing the lowest polarization resistance of 0.25 Ωcm 2 at 650 °C, more than five times lower than 1.28 Ωcm 2 for the bare LNO.
研究领域:
材料科学
·
电化学
·
能源材料
·
固体氧化物电化学
·
纳米催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Pengkai Shan,Hui Ye,Zeping Chen,Bin Qian,Chuan Zhou,Hui Yang,Yifeng Zheng
Ruddlesden-Popper (RP) perovskite oxides (A n+1 B n O 3n+1 ) are promising air electrodes for solid oxide electrolysis cells (SOECs) due to their excellent electrochemical performance and unique structure. Herein, a method of anionic engineering for the oxygen sites of air electrode materials has been proposed in order to further improve the electrocatalytic activity and thermal stability of La 2 NiO 4+δ (LNO). La 2 NiO 4+δ-x F x (x = 0, 0.05, 0.1, 0.15, denoted as LNOF0, LNOF005, LNOF01, LNOF015) perovskite oxides are synthesized and evaluated as the air electrode for SOECs. Introducing electronegative F − weakens the metal-oxygen bond, optimizes the oxidation environment (e.g., lattice oxygen activity), and improves surface oxygen exchange. The increased ratio of reactive oxygen species accelerates the oxygen evolution reaction (OER) process. Moreover, the polarization resistance of LNOF01 is 33.3 % lower than that of the LNO in the same test condition at 800 °C. The current densities of the full cell prepared using LNOF01 air electrode for CO 2 and H 2 O electrolysis at 800 °C are 1.23 A cm −2 (70 % CO 2 –30 % CO, 1.5 V) and 1.04 A cm −2 (70 % H 2 O-30 % H 2 , 1.3 V), which are enhanced by 25.51 % and 44.44 % compared to the LNO, respectively. In the stability tests, the LNOF01 half-cell maintains stability for more than 170 h at 0.5 A cm −2 and 800 °C, and the full cell tests with the electrolysis of CO 2 and H 2 O maintains stability for more than 50 h at as high as 1 A cm −2 and 800 °C, respectively. This study provides a rational design strategy for constructing high-performance SOECs air electrodes and demonstrates the potential of air electrode anion engineering for SOECs applications.
研究领域:
材料科学
·
电化学
·
能源技术
·
固体氧化物燃料电池/电解池
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yuehua Li,Shaoxian Li,Weiwei Meng,Lei Dai,Ling Wang
A series of impedancemetric sensors for ammonia detection were fabricated using yttrium stabilized zirconia (YSZ) electrolyte and La n+1 Ni n O 3n+1 (n = 1, 2, and 3) sensing electrodes. The sensing materials with layered perovskite structure were prepared using in-situ impregnation method and well-dispersed in YSZ porous skeleton after calcination at 900 °C. The sensing performances of the sensors with La n+1 Ni n O 3n+1 sensing electrodes were investigated using the impedancemetric modulus |Z| and phase angle Θ as response signals, respectively. The results show that the sensor with La 2 NiO 4+ δ sensing electrode exhibits the higher response values and sensitivity compared to the sensor using La 3 Ni 2 O 7- δ or La 4 Ni 3 O 10- δ sensing electrodes, which is attributed to the largest NH 3 adsorption capacity of La 2 NiO 4+ δ . The response signals |Z| or Θ of the La 2 NiO 4+ δ based sensor linearly depend on NH 3 concentrations. The sensor hardly is insensitive to co-existing gases such as CO 2 , CH 4 , H 2 and relative humidity, but NO or NO 2 causes a positive error.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2015
·Vol. 25
·期 1
·392-400
·
IF 1.344
Li Ying,Zhang Shan-Lin,Li Cheng-Xin,Wei Tao,Yang Guan-Jun,Li Chang-Jiu,Liu Meilin
Perovskite-structured (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 ) LSCF has been widely studied as a cathode material for intermediate-temperature solid oxide fuel cells. However, the application of LSCF cathode is likely to be limited by its sluggish surface catalytic properties and long-term stability issues. Oxygen hyper-stoichiometric La 2 NiO 4+δ with K 2 NiF 4 structure exhibits higher catalytic properties, ionic conductivity, and stability in comparison with LSCF cathode. Due to the good chemical compatibility of these two cathode materials, it is possible to prepare a composite cathode by the infiltration of La 2 NiO 4+δ in the porous LSCF. This composite structure fully utilizes the advantages of the two cathodes and enhances the LSCF cathode performance. In this study, the LSCF cathode was deposited by using an atmospheric plasma spray technique, and the porous LSCF cathode was then infiltrated by La 2 NiO 4+δ . The atmospheric plasma spray technique was used to reduce the SOFC manufacturing cost. The microstructure of coatings was characterized by SEM and EDS. The cathode polarization resistance was found to decrease by ~40% after the La 2 NiO 4+δ infiltration. Also, the activation energy decreased from 1.53 to 1.40 eV.
研究领域:
材料科学
·
能源工程
·
电化学
·
陶瓷
·
燃料电池
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Jin Li,Peng Qiu,Meng Xia,Lichao Jia,Bo Chi,Jian Pu,Jian Li
Four PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF)-La 2 NiO 4+δ (LN) core-shell cathodes, designated as PL-0, PL-1, PL-3 and PL-5, are prepared by infiltrating LN solution into PBSCF scaffold, and they are investigated in terms of the effect of LN thickness on their electrochemical performance. PL-3 with a continuous LN coating of a moderate average thickness (∼9 nm) demonstrates the lowest initial polarization resistance (0.51 Ω cm 2 ) and highest power density (0.71 W cm −2 ) among all the cathodes. Polarized at 400 mA cm −2 and 700 °C for up to 40 h, the polarization resistance of all the prepared cathodes increases to approach a stable level after early stage decrease due to current activation, and PL-3 exhibits a slower average rate of performance degradation (25%). The electrochemical performance improvement is mainly attributed to that LN has a relatively high oxygen surface exchange coefficient and continuous LN coating depresses Sr segregation at PBSCF/LN interface.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jin Li,Jun Li,Dong Yan,Jian Pu,Bo Chi,Li Jian
Cr-poisoning effect on pure double-perovskite PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) cathode and La 2 NiO 4+δ (LN)-coated PBSCF cathode is investigated. During the Cr poisoning test at 750 °C in the presence of SUS430 interconnect, the electrochemical performance of pure PBSCF cathode shows severe degradation, and the significant increase in R P is mainly contributed by the increased R L . The BaCrO 4 deposits are identified on the PBSCF cathode surface. LN-coated PBSCF cathode, by contrast, shows remarkable tolerance towards chromium. The reaction between volatile Cr species and PBSCF cathode can be prevented by a dense LN coating. Thus, a more stable electrochemical performance is achieved by LN-coated cathode during the Cr poisoning test. The results indicate that the introduction of LN coating not only improves the cathode electrochemical performance, but also prevents the cathode from being poisoned by chromium.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）