Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices,Energy & Environmental Science

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Highly active and thermally stable single-atom catalysts for high-temperature electrochemical devices
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-08-14 , DOI: 10.1039/d0ee01680b
Jisu Shin _{1,

2,

3,

4,

5} , Young Joo Lee _{4,

5,

6,

7} , Asif Jan _{1,

2,

3,

4,

8} , Sung Min Choi _{1,

2,

3,

4} , Mi Young Park _{1,

2,

3,

4,

9} , Sungjun Choi _{1,

2,

3,

4,

10} , Jun Yeon Hwang _{2,

4,

11,

12} , Seungki Hong _{2,

4,

11,

12} , Seung Gyu Park _{2,

4,

11,

12} , Hye Jung Chang _{2,

3,

4,

13} , Min Kyung Cho _{2,

3,

4,

13} , Jitendra Pal Singh _{4,

14,

15,

16} , Keun Hwa Chae _{2,

3,

4,

13} , Sungeun Yang _{1,

2,

3,

4} , Ho-Il Ji _{1,

2,

3,

4} , Hyoungchul Kim _{1,

2,

3,

4} , Ji-Won Son _{1,

2,

3,

4} , Jong-Ho Lee _{1,

2,

3,

4} , Byung-Kook Kim _{1,

2,

3,

4} , Hae-Weon Lee _{1,

2,

3,

4} , Jongsup Hong _{4,

17,

18,

19,

20} , Yun Jung Lee _{4,

5,

6,

7} , Kyung Joong Yoon _{1,

2,

3,

4,

20}

Affiliation

Center for Energy Materials Research
Korea Institute of Science and Technology
Seoul 02792
Republic of Korea
Department of Energy Engineering
Hanyang University
Seoul 04763
Nanomaterials Science and Engineering
Department of Materials Science and Engineering
Department of Chemical Engineering
Carbon Composite Materials Research Center
Jeonbuk 55324
Advanced Analysis Center
Pohang Accelerator Laboratory
Pohang University of Science and Technology
Pohang 37673
Department of Mechanical Engineering
Yonsei University
Seoul 0.722
Yonsei-KIST Convergence Research Institute

Single-atom catalysts provide unique catalytic properties and maximize the atom utilization efficiency. While utilizing them at elevated temperatures is highly desirable, their operating temperature is usually kept below 300 °C to prevent isolated atoms from agglomerating. Moreover, their applications in high-temperature electrochemical devices have been hindered by the lack of suitable processing techniques for catalyst loading. Herein, we report single-atom Pt/ceria nanocatalysts that are highly active and thermally stable in solid oxide cells (SOCs) operating at 600–800 °C. Our urea-based chemical solution process creates strong Pt–O–Ce interactions that securely anchor isolated Pt atoms to the surface of ceria nanoparticles and suppress their high-temperature migration. These single-atom Pt/ceria nanocatalysts are loaded in the oxide fuel electrode of a SOC via an in situ synthetic process, which reduces the polarization resistance from 28.2 to 0.82 Ohm cm² at 600 °C. This electrode outperforms the state-of-the-art Ni-based fuel electrode by up to 10 times and delivers extremely high performance in full SOCs in fuel cell and electrolysis modes. Furthermore, it stably operates at 700 °C for over 500 h under realistic operating conditions. Our results provide guidance to resolve the critical issues for the practical use of single-atom catalysts in various industrial processes and accelerate the commercial development of next-generation high-temperature energy devices.

中文翻译：

用于高温电化学装置的高活性和热稳定的单原子催化剂

单原子催化剂提供独特的催化性能，并最大限度地提高了原子利用效率。尽管非常需要在高温下使用它们，但它们的工作温度通常保持在300°C以下，以防止孤立的原子团聚。此外，由于缺乏合适的催化剂装载处理技术，阻碍了它们在高温电化学装置中的应用。本文中，我们报道了在600–800°C的温度下在固体氧化物电池（SOC）中具有高活性和热稳定性的单原子Pt /二氧化铈纳米催化剂。我们基于尿素的化学溶液工艺可产生强大的Pt-O-Ce相互作用，从而将孤立的Pt原子牢固地锚固在二氧化铈纳米颗粒的表面，并抑制其高温迁移。通过一个在原位合成方法，这降低了从28.2到0.82欧姆厘米极化电阻²在600℃下。该电极的性能比最先进的镍基燃料电极高出10倍，并且在燃料电池和电解模式下的完全SOC中具有极高的性能。此外，它在实际操作条件下于700°C稳定运行500 h以上。我们的结果为解决在各种工业过程中实际使用单原子催化剂的关键问题提供了指导，并加速了下一代高温能源设备的商业开发。

更新日期：2020-08-14

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