Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices

Shin, Jisu; Lee, Young Joo; Jan, Asif; Choi, Sung Min; Park, Mi Young; Choi, Sunghoon; Hwang, Jun Yeon; Hong, Soon Hyeok; Park, Seung Gyu; Chang, Hye Jung; Cho, Min Kyung; Singh, Jitendra Pal; Chae, Keun Hwa; Yang, Sungeun; Ji, Hyunjin; Kim, Hyoungchul; Son, Ji‐Won; Lee, Jong Ho; Kim, Byung Kook; Lee, Hae Weon; Hong, Jongsup; Lee, Yun Jung; Yoon, Kyung Joong

doi:10.1039/d0ee01680b

Cited by 48 publications

(32 citation statements)

References 137 publications

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“…Theoretical studies revealed that the extremely high stability originated from the significant CMSIs formed between the positively charged Au SAs with the FeO x support. [ 51 ] Similar phenomena were also evidenced for Pt 1 /FeO x , [ 7,52 ] Pt 1 /CeO 2 , [ 53 ] Au 1 /CeO 2 , [ 54 ] Ir 1 /FeO x , [ 55 ] and other M 1 /FeO x . [ 56 ] For carbon‐based substrates, the coordination environment of SAs including the coordination mode and coordination strength directly influences the interaction between metal atoms and substrates.…”

Section: Constructing Strategies Of Environmental Sacssupporting

confidence: 62%

Heterogeneous Single Atom Environmental Catalysis: Fundamentals, Applications, and Opportunities

Cui

et al. 2021

Adv Funct Materials

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The development of efficient catalysts is pivotal for pollution abatement to guarantee a sustainable and green industrial production. Supported single atom catalysts (SACs) with the advantages of maximum atom utilization, unique electronic structure, and distinguished metal support interaction have recently become a hotspot in the catalysis community, and bring new opportunities for environmental catalysis. This review aims to provide a comprehensive overview of the latest progress on the environmental SACs from both the fundamental and practical points of view. It starts with highlighting the state‐of‐the‐art synthesis strategies of great values for the practical use to construct challenging SACs. The applications of SACs in the environmental remediation processes are critically summarized, including CO oxidation, NOx decomposition, volatile organic compounds incineration, CO2 conversion, and water purification. Meanwhile, the topic also sketches out the recent progress for the non‐mercury catalyzed acetylene hydrochlorination reaction to address the environmental‐benign synthesis. Emphasis is placed on the elucidation of the structure–activity relationships and the underlying catalytic mechanisms to shed light on the guidelines for catalyst optimization and upgradation. Finally, the remaining challenges and perspectives for this flourishing field are also discussed.

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Section: Constructing Strategies Of Environmental Sacssupporting

confidence: 62%

Heterogeneous Single Atom Environmental Catalysis: Fundamentals, Applications, and Opportunities

Cui

et al. 2021

Adv Funct Materials

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“…Recently, Yoon and colleagues synthesized thermally stable Pt‐CeO 2 nanoparticles with Pt SAs (up to 3–4 wt%) homogeneously distributed on CeO 2 and successfully implemented them as the electrode for a SOFC. The reported cell performance was greatly improved, outperforming the state‐of‐art Ni‐based fuel cell electrode 309 . They utilized symmetric cells to measure the electrochemical performance of Pt‐CeO 2 ‐infiltrated La 0.6 Sr 0.4 Cr 0.5 Mn 0.5 O 3−δ (LSCM) electrode where Pt‐CeO 2 nanocrystals uniformly deposited on the functional layer (Figure 10g) and found that Pt‐CeO 2 ‐LSCM electrode delivered the lowest polarization resistance at 600–800°C in comparison with blank LSCM and conversational Ni‐based electrode (Figure 10i).…”

Section: Applications In Energy Devicesmentioning

confidence: 99%

“…The reported cell performance was greatly improved, outperforming the state-of-art Ni-based fuel cell electrode. 309 They utilized symmetric cells to measure the electrochemical performance of Pt-CeO 2infiltrated La 0.6 Sr 0.4 Cr 0.5 Mn 0.5 O 3Àδ (LSCM) electrode where Pt-CeO 2 nanocrystals uniformly deposited on the functional layer (Figure 10g) and found that Pt-CeO 2 -LSCM electrode delivered the lowest polarization resistance at 600-800 C in comparison with blank LSCM and conversational Ni-based electrode (Figure 10i). The incorporation of Pt-CeO 2 reduced the polarization resistance of LSCM from 28.2 to 0.82 Ohm cm 2 at 600 C. In the interest of further identifying the contribution of Pt SAs, the electrode performances of LSCM infiltrated with CeO 2 , Pt NPs/CeO 2 and Pt-CeO 2 were evaluated and compared.…”

Section: Sofcsmentioning

confidence: 99%

Single metal atoms catalysts—Promising candidates for next generation energy storage and conversion devices

Lei

Sathish

Liu

et al. 2022

EcoMat

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Single-metal-atom catalysts (SMACs) with the merits of maximum atom utilization, peculiar electronic structure, and adjustable coordination environment, have emerged as the rising stars. They are not only regarded as the promising electrocatalysts, but also show unconventionally excellent alkali storage, thus enabling them for energy devices. In this work, we review the up-to-date progress of single metal atom catalysts including the detailed synthetic strategies and all sorts of applications in energy storage and conversion. In addition, we also discuss intrinsic catalytic effects, degradation mechanism, modulation approaches, support structure design, current challenges, and potential development trends. This work may shed light on developing high-performance SMACs using a variety of strategies for catalytic and energy applications.

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“…Sr segregation induces low initial performance in SOFCs and results in continuous performance degradation. In the intermediate temperature (IT) region (500°C‐600°C), the cathode of SOFCs plays a vital role in most sluggish fuel‐cell reaction mechanisms and is known as the rate‐determining step 19‐21 . Therefore, it is crucial to maintain the intrinsic performance of the target perovskite cathode in the low‐temperature region while preventing the segregation of the cationic material at the A‐site.…”

Section: Introductionmentioning

confidence: 99%

Improved strontium segregation suppression of lanthanum strontium cobalt oxide cathode via chemical etching and atomic layer deposition

Kim

Yang

Kwon

et al. 2022

Intl J of Energy Research

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This study was conducted to improve the stability of a high-performance cathode, which plays a crucial role in lowering the operating temperature of solid oxide fuel cells (SOFCs) to below 600 C while retaining its performance. Lanthanum strontium cobalt oxide (LSC) is a representative SOFC cathode material used in the intermediate temperature (IT) region (500 C-600 C). When segregation occurs on the cathode surface during high-temperature fabrication, the initial performance degrades to a certain extent, followed by continuous performance degradation. Herein, we aimed to overcome this degradation through surface modification. Accordingly, an ideal LSC surface composition was achieved by removing the segregated Sr through wet chemical etching of the cathode surface. Further, an atomic layer deposition (ALD) process of less than 1 nm thickness was introduced to prevent further Sr separation and minimize performance degradation. The peak power density of the cell with the modified surface (M-LSC) at 550 C was 509 mW cm À2 , whereas that of the cell with bare LSC was 483 mW cm À2 . Based on the 70-h short-term stability test, the bare LSC showed a degradation of 70 mV, while the M-LSC remained stable with no degradation.

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Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices

Abstract: Single-atom catalysts provide unique catalytic properties and maximize atom utilization efficiency. While utilizing them at elevated temperatures is highly desirable, their operating temperature is usually kept below 300°C to prevent...

Cited by 48 publications

References 137 publications

Heterogeneous Single Atom Environmental Catalysis: Fundamentals, Applications, and Opportunities

Heterogeneous Single Atom Environmental Catalysis: Fundamentals, Applications, and Opportunities

Single metal atoms catalysts—Promising candidates for next generation energy storage and conversion devices

Improved strontium segregation suppression of lanthanum strontium cobalt oxide cathode via chemical etching and atomic layer deposition

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