journal article·2023-11-06

Highly Active Cathode Achieved by Constructing Surface Proton Acid Sites through Electronic Regulation of Heteroatoms

Xinyu Li, Zemin Chen, Daoming Huan, Bingbing Qiu, Kang Zhu, Zeming Qi, Hengjie Liu, Changrong Xia, Ranran Peng, Yalin Lu

ACS Materials Letters· Volume 5· Issue 11
Publisher page

Abstract

For proton-conducting solid oxide fuel cells (PCFCs), accelerating the kinetics of the proton involved oxygen reduction reaction (P-ORR) occurring primarily on the surface of cathodes is of key importance. To this end, developing simple, efficient, and economical strategies to optimize the gas–solid interface is crucial but full of challenges. Herein, the heteroatom boron (B) is first introduced to modify the PCFC cathode surface (Pr 4 Ni 3 O 10+δ, PN) by mechanical mixing method (0.5B-PN). Combined with in situ/ex situ characterizations and DFT calculation, it is found that the CO 2 resistance, surface hydration ability, and surface electrocatalytic activity toward P-ORR are significantly improved by B decoration. Importantly, the B element is found to raise the surface Brønsted acid (−OH) concentration yet depress the surface Lewis acidity, both of which are conducive to P-ORR reaction. At 600 °C, the maximum power density of the cell using 0.5B-PN as the cathode improved by 149.5% compared with that using the PN cathode. This work opens up a new avenue for developing novel PCFC cathodes via nonmetallic regulation of surface.
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Research context

OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Electrocatalysts for Energy Conversion

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, No. 96 Jinzhai Road, Hefei, Anhui Province 230026, PR China

CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory for Biomass Clean Energy and Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China

Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

Hefei National Laboratory of Physical Science at the Micro-scale, University of Science and Technology of China, Hefei, 230026 Anhui, China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Anhui Initiative in Quantum Information Technologies

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