ORCID Profile
0000-0002-6889-187X
Current Organisation
University of Macau
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Publisher: Wiley
Date: 24-04-2022
Abstract: Potassium‐ion batteries (PIBs) are a favorable alternative to lithium‐ion batteries (LIBs) for the large‐scale electrochemical storage devices because of the high natural abundance of potassium resources. However, conventional PIB electrodes usually exhibit low actual capacities and poor cyclic stability due to the large radius of potassium ions (1.39 Å). In addition, the high reactivity of potassium metal raises serious safety concerns. These characteristics seriously inhibit the practical use of PIB electrodes. Here, zinc phosphide composites are rationally designed as PIB anodes for operation in a nonflammable triethyl phosphate (TEP) electrolyte to solve the above‐mentioned issues. The optimized zinc phosphide composite with 20 wt% zinc phosphate presents a high specific capacity (571.1 mA h g −1 at 0.1 A g −1 ) and excellent cycling performance (484.9 mA h g −1 with the capacity retention of 94.5% after 1000 cycles at 0.5 A g −1 ) in the KFSI‐TEP electrolyte. XPS depth profile analysis shows that the improved cycling stability of the composite is closely related to the reversible dynamic evolutions and conversions of the sulfur‐containing species in the solid electrolyte interphase (SEI) during the charge/discharge process. This dynamic reversible SEI concept may provide a new strategy for the design of superior electrodes for PIBs.
Publisher: Wiley
Date: 22-02-2023
Abstract: Developing low‐cost single‐atom catalysts (SACs) with high‐density active sites for oxygen reduction/evolution reactions (ORR/OER) are desirable to promote the performance and application of metal–air batteries. Herein, the Fe nanoparticles are precisely regulated to Fe single atoms supported on the waste biomass corn silk (CS) based porous carbon for ORR and OER. The distinct hierarchical porous structure and hollow tube morphology are critical for boosting ORR/OER performance through exposing more accessible active sites, providing facile electron conductivity, and facilitating the mass transfer of reactant. Moreover, the enhanced intrinsic activity is mainly ascribed to the high Fe single‐atom (4.3 wt.%) loading content in the as‐synthesized catalyst.Moreover, the ultra‐high N doping (10 wt.%) can compensate the insufficient OER performance of conventional FeNC catalysts. When as‐prepared catalysts are assembled as air‐electrodes in flexible Zn–air batteries, they perform a high peak power density of 101 mW cm −2 , a stable discharge–charge voltage gap of 0.73 V for h, which shows a great potential for Zinc–air battery. This work provides an avenue to transform the renewable low‐cost biomass materials into bifunctional electrocatalysts with high‐density single‐atom active sites and hierarchical porous structure.
Publisher: Wiley
Date: 13-02-2018
Abstract: Electrocatalytic performance can be enhanced by engineering a purposely designed nanoheterojunction and fine‐tuning the interface electronic structure. Herein a new approach of developing atomic epitaxial in‐growth in Co‐Ni 3 N nanowires array is devised, where a nanoconfinement effect is reinforced at the interface. The Co‐Ni 3 N heterostructure array is formed by thermal annealing NiCo 2 O 4 precursor nanowires under an optimized condition, during which the nanowire morphology is retained. The epitaxial in‐growth structure of Co‐Ni 3 N at nanometer scale facilitates the electron transfer between the two different domains at the epitaxial interface, leading to a significant enhancement in catalytic activities for both hydrogen and oxygen evolution reactions (10 and 16 times higher in the respective turn‐over frequency compared to Ni 3 N‐alone nanorods). The interface transfer effect is verified by electronic binding energy shift and density functional theory (DFT) calculations. This nanoconfinement effect occurring during in situ atomic epitaxial in‐growth of the two compatible materials shows an effective pathway toward high‐performance electrocatalysis and energy storages.
Publisher: Wiley
Date: 02-08-2021
Abstract: With potential commercial applications, inverted perovskite solar cells (PSCs) have received wide‐spread attentions as they are compatible with tandem devices and processed at low‐temperature. Nevertheless, their efficiencies remain unsatisfactory due to insufficient film quality on hydrophobic hole transport layer and limited hole‐blocking capability of the electron transport layer. Herein, 1,3,5‐Tris(1‐phenyl‐1H‐benzimidazol‐2‐yl)benzene (TPBi), an n‐type semiconductor, is incorporated into the antisolvent to simultaneously regulate the grain growth and charge transport of perovskite films. TPBi facilitates the crystallization of perovskites along (100) orientation. Besides, TPBi is mainly distributed near the top surface of perovskite film and enhances the hole‐blocking capability of the area adjacent to the surface. The superior properties of this film lead to a remarkable improvement in the open‐circuit voltage of inverted PSCs. The ch ion device achieves a high power conversion efficiency of 21.79% while keeping ≈92% of its initial value after 1000 h storage in the ambient atmosphere. This work provides an effective way to evidently promote the performance of inverted PSCs and illustrates its underlaying mechanism.
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