Highly stable and efficient Pt single-atom catalyst for reversible proton-conducting solid oxide cells

Li, Xinyu; Chen, Zemin; Yang, Yi; Huan, Daoming; Su, Hui; Zhu, Kan; Shi, Nai; Qi, Zeming; Zheng, Xusheng; Pan, Haibin; Zhan, Zhongliang; Xia, Changrong; Peng, Ranran; Wei, Shiqiang; Lu, Yalin

doi:10.1016/j.apcatb.2022.121627

Cited by 24 publications

(16 citation statements)

References 53 publications

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“…The calculated E a values of S-LSCF and H-LSCF are 78.5 and 67.4 kJ mol –1 , respectively. The previous literature has confirmed that the better the catalytic activity, the lower the E a value. , Therefore, it can be inferred that H-LSCF shows higher catalytic activity, consistent with the result obtained from R p values. The possible reason why H-LSCF has better catalytic activity is that it has more surface oxygen vacancies.…”

Section: Resultssupporting

confidence: 88%

“…There may be two main reasons for the performance degradation of RSCCs. (1) The morphology of carbonate changes during the electrolysis process. Previous research has found that the morphology of carbonate in RSCC gradually becomes lumpy and flake during the operation process.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Water electrolysis with renewable energy can provide continuous low-carbon hydrogen, and this technology has great development space. , Reversible solid oxide cell (RSOC) can operate in solid oxide fuel cell (SOFC) mode in case of power shortage to release electric energy for users. In addition, in case of excess electric energy, it can operate in solid oxide electrolysis cell (SOEC) mode to convert the remaining electric energy into chemical energy in fuel (H 2 , etc.)…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Ping

Liu

Wei

et al. 2022

Ind. Eng. Chem. Res.

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Perovskite La0.5Sr0.5Co0.2Fe0.8O3 (LSCF) usually acts as both cathode and anode in a reversible solid oxide cell (RSOC). It is found that the traditional preparation method can be improved to reduce the particle size, increase the specific surface area, and enhance the oxygen vacancy concentration of LSCF, further improving its bifunctional electrocatalytic activity toward oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR). Compared with that of LSCF prepared by the traditional solid-state reaction method, the oxygen vacancy concentration of LSCF prepared by the hard-template method is increased. Moreover, the LSCF prepared by the hard-template method shows better catalytic activity for HOR and ORR. In addition, the rate-determining steps for HOR and ORR on the surface of LSCF prepared by the hard-template method are the charge transfer reaction and the reduction of oxygen atoms to O–, respectively. Furthermore, a single-component fuel cell and a reversible single-component cell composed of LSCF prepared by the hard-template method exhibit better performance for discharge and water electrolysis.

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Section: Resultssupporting

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Ping

Liu

Wei

et al. 2022

Ind. Eng. Chem. Res.

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“…Therefore, the equivalent symmetrical cell composed of R-PSCFM-1 has the smallest R o value, while the cell composed of R-PSCFM-3 has the largest R o value. In addition, the R p values reflect the catalytic activity toward HOR and the smaller the R p value, the better the catalytic activity for HOR. , Therefore, R-PSCFM-1 has the best catalytic activity and R-PSCFM-3 has the lowest catalytic activity. To further explore the factors affecting the catalytic activity of R-PSCFM, the distribution of relaxation time (DRT) method was used, and the results are shown in Figure S3.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Performance of Pr_0.4Sr_0.5Co_xFe_0.9–xMo_0.1O_3−δ Oxides in a Reversible SOFC/SOEC System

Ping

Han

et al. 2022

Energy Fuels

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Changing the type and content of cation doping in perovskite oxide can improve its electrocatalytic performance in various environmental and energy devices. In this study, perovskite oxides Pr 0.4 Sr 0.5 Co x Fe 0.9−x Mo 0.1 O 3−δ (PSCFM, x = 0.1, 0.2, 0.45, and 0.7) are synthesized and act as semiconductors of singlecomponent fuel cells (SCFCs) and reversible single component cells (RSCCs). Under reducing conditions, the CoFe alloy nanoparticles are exsolved in situ and uniformly distributed on the perovskite surface. With the change of Co doping amount, the alloy types and particle sizes are varied. As the main place of electrochemical reaction, oxygen vacancy affects the catalytic activity of electrode materials. For the reduced PSCFM (R-PSCFM), the oxygen vacancy concentration decreases first and then increases with the increase in Co content. With a moderate Co doping level, Pr 0.4 Sr 0.5 Co 0.1 Fe 0.8 Mo 0.1 O 3−δ displays the best catalytic activity for hydrogen oxidation reaction (HOR) and Pr 0.4 Sr 0.5 Co 0.7 Fe 0.2 Mo 0.1 O 3−δ shows the best catalytic performance for oxygen reduction reaction (ORR). In addition, the rate-determining step (RDS) of HOR is a mixture of oxygen surface exchange and charge transfer reaction, and for ORR, the RDS is the reduction of oxygen atoms to O − . Furthermore, when the semiconductor material composition is Pr 0.4 Sr 0.5 Co 0.1 Fe 0.8 Mo 0.1 O 3−δ , the best performance characterized by high output power and electrolysis current density can be obtained under the SOFC/SOEC reversible operation.

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“…Besides the single-phase TCO, nanocomposites prepared by physical composite, impregnation and self-assembly were also designed as promising TCO air electrodes for R-PCECs [ 20 , 21 ]. Nevertheless, these TCO suffer from the problems of high thermal expansion coefficient, insufficient electrical conductivity and low bifunctionality for both ORR and OER, hence still requiring more advanced air electrodes for R-PCECs [ 3 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Perovskite Oxide: A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

et al. 2022

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Reversible proton ceramic electrochemical cell (R-PCEC) is regarded as the most promising energy conversion device, which can realize efficient mutual conversion of electrical and chemical energy and to solve the problem of large-scale energy storage. However, the development of robust electrodes with high catalytic activity is the main bottleneck for the commercialization of R-PCECs. Here, a novel type of high-entropy perovskite oxide consisting of six equimolar metals in the A-site, Pr1/6La1/6Nd1/6Ba1/6Sr1/6Ca1/6CoO3−δ (PLNBSCC), is reported as a high-performance bifunctional air electrode for R-PCEC. By harnessing the unique functionalities of multiple elements, high-entropy perovskite oxide can be anticipated to accelerate reaction rates in both fuel cell and electrolysis modes. Especially, an R-PCEC utilizing the PLNBSCC air electrode achieves exceptional electrochemical performances, demonstrating a peak power density of 1.21 W cm−2 for the fuel cell, while simultaneously obtaining an astonishing current density of − 1.95 A cm−2 at an electrolysis voltage of 1.3 V and a temperature of 600 °C. The significantly enhanced electrochemical performance and durability of the PLNBSCC air electrode is attributed mainly to the high electrons/ions conductivity, fast hydration reactivity and high configurational entropy. This research explores to a new avenue to develop optimally active and stable air electrodes for R-PCECs.

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Highly stable and efficient Pt single-atom catalyst for reversible proton-conducting solid oxide cells

Cited by 24 publications

References 53 publications

Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Electrochemical Performance of Pr_0.4Sr_0.5Co_xFe_0.9–xMo_0.1O_3−δ Oxides in a Reversible SOFC/SOEC System

High-Entropy Perovskite Oxide: A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

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Highly stable and efficient Pt single-atom catalyst for reversible proton-conducting solid oxide cells

Cited by 24 publications

References 53 publications

Enhancing Bifunctional Electrocatalytic Activities of La0.5Sr0.5Co0.2Fe0.8O3 in Reversible Single-Component Cells

Enhancing Bifunctional Electrocatalytic Activities of La0.5Sr0.5Co0.2Fe0.8O3 in Reversible Single-Component Cells

Electrochemical Performance of Pr0.4Sr0.5CoxFe0.9–xMo0.1O3−δ Oxides in a Reversible SOFC/SOEC System

High-Entropy Perovskite Oxide: A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

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Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Electrochemical Performance of Pr_0.4Sr_0.5Co_xFe_0.9–xMo_0.1O_3−δ Oxides in a Reversible SOFC/SOEC System