CHEMICAL SCIENCE

Professor Cuiling Li of BIT: Defect-rich crystalline/amorphous porous RuO2 nanoparticles promote acid oxygen evolution


May 15, 2023, Beijing Institute of TechnologyLi CuilingProfessor published a new journal at Tsinghua UniversityNano Research EnergyPublished the latest research results entitled “Phase engineering oriented defect-rich amorphous/crystalline RuO2 nanoporous particles for boosting oxygen evolution reaction in acid media”.

Electrocatalytic water splitting to produce hydrogenIt is a very potential energy conversion technology, which has the advantages of simple raw materials, no greenhouse gas emissions, high efficiency of hydrogen and oxygen production and high product purity, which can alleviate the current energy and environmental crisis. However, due to the slow kinetics of the electrolyzed water anode oxygen evolution reaction (OER), the efficiency of hydrogen production by electrolysis of water is still low. Therefore, the development of highly active OER electrocatalysts is essential for clean energy conversion.Ruthenium oxide (RuO2)One of the most active OER catalysts, it has the best adsorption energy for reactants and oxygen intermediates and is less expensive among all precious metals. At present, researchers have conducted extensive research on RuO2-based nanomaterials from different aspects, including morphology regulation, crystal phase regulation, electronic structure regulation and defect engineering, and are committed to designing and synthesizing RuO2-based nanomaterials with better OER performance.

Figure 1. (a) Schematic diagram of the preparation process of crystalline/amorphous porous RuO2 catalyst; (b) SEM plot of crystalline/amorphous porous RuO2 nanoparticles; (c) HRTEM diagram of crystalline/amorphous porous RuO2 nanoparticles; (d) Performance comparison chart of porous RuO2 catalyst and related comparison samples.

Porous materialHas a larger oneSpecific surface areaabundantActive siteAnd fastMass transfer efficiencyIt has great advantages in electrocatalytic applications, and the unique surface atomic structure produced by its abundant pores plays a key role in enhancing the intrinsic activity of catalysts. In recent years, in order to fully develop and utilize the structural advantages of porous materials, porous materials with various morphologies, compositions and porous structures have been widely studied. In addition, reasonable regulation of the atomic rearrangement on the surface of the catalyst can affect the crystal phase structure of the electrocatalyst, produce rich coordination unsaturated sites, defects, exposed atoms and activated boundaries, and then improve the catalytic activity of the electrocatalyst. thereintoCrystalline/amorphous phase out-of-phase structural catalystsIt has the advantages of dual crystal phase structure, high conductivity in the crystal phase structure and abundant defects in the amorphous phase structure synergistic to stimulate the high catalytic activity of nanomaterials. Based on this, the clever introduction of crystalline/amorphous phase heterogeneous structure into the porous structure is expected to achieve excellent electrocatalytic performance.

In this work, Beijing Institute of TechnologyLi CuiProfessor Ling’s research group successfully prepared defect-rich crystalline/amorphous porous RuO2 (a/c-RuO2) nanoparticles by integrating phase engineering into porous material synthesis. Firstly, preliminary amorphous RuO2 porous particles were synthesized by template-assisted molten salt method. After annealing, temperature-dependent porous a/c-RuO2 nanoparticles were obtained. a/c-RuO2-200 porous particles exhibit a delicate balance between porous and multiphase structures, achieving superior OER performance thanks to their rich defects, grain boundaries, and accessibility to active sites. For OER in acidic media, a/c-RuO2-200 in 10 mAcm−2 of current density manifested 165 mV low overpotential, exhibiting up to 200 mV overpotential 133.8 mAmg−1 of high-quality activity, exceeding commercial RuO2 and most reported RuO2.

Related paper information:

Wang C, Geng Q, Fan L, et al. Phase engineering oriented defect-rich amorphous/crystalline RuO2 nanoporous particles for boosting oxygen evolution reaction in acid media. Nano Research Energy, 2023, https://doi.org/10.26599/NRE.2023.9120070.

doi:10.26599/NRE.2023.9120070

Nano Research Energy is a companion journal of Nano Research, (ISSN: 2791-0091; e-ISSN: 2790-8119; Official Website: https://www.sciopen.com/journal/2790-8119Founded in March 2022, Professor Qu Liangti of Tsinghua University and Professor Chunyi Zhi of City University of Hong Kong serve as editors-in-chief.Nano Research EnergyIt is an international multidisciplinary and English-based open access journal, focusing on the cutting-edge research and application of nanomaterials and nanoscience and technology in new energy-related fields, benchmarking against top international energy journals, and committed to publishing high-level original research and review papers, which has been selected2022 China Science and Technology Journals Excellence Action Plan – High Starting Point New Journal Project。 APC fees will be waived until 2025, and teachers are welcome to submit their papers.

To submit, please contact:

NanoResearchEnergy@tup.tsinghua.edu.cn

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