ORCID Profile
0000-0001-5150-5832
Current Organisation
University of Adelaide
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Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA11493F
Abstract: We demonstrate a template-free strategy to synthesize N-doped carbon spheres by pyrolysis of self-assembled UF resin. The NPCS-900 exhibits excellent ORR electrocatalytic performance both in alkaline and acid solution compared to that of Pt/C.
Publisher: University of Alberta Library
Date: 2022
DOI: 10.7939/R3-3RP1-0B95
Publisher: Wiley
Date: 11-07-2021
Abstract: Renewable organic cathodes with abundant elements show promise for sustainable rechargeable batteries. Herein, for the first time, utilizing C 60 fullerene as organic cathode for room‐temperature lithium‐ion battery is reported. The C 60 cathode shows robust electrochemical performance preferably in ether‐based electrolyte. It delivers discharge capacity up to 120 mAh g −1 and specific energy exceeding 200 Wh kg −1 with high initial Coulombic efficiency of 91%. The as‐fabricated battery holds a capacity of 90 mAh g −1 after 50 cycles and showcases remarkable rate performance with 77 mAh g −1 retained at 500 mA g −1 . Noteworthily, three couples of unusual flat voltage plateaus recur at ≈2.4, 1.7, and 1.5 V, respectively. Diffusion‐dominated three‐electron‐redox reactions are revealed by cyclic voltammogram and plateau capacities. Intriguingly, it is for the first time unveiled by in situ X‐ray diffraction (XRD) that the C 60 cathode underwent three reversible phase transitions during lithiation/delithiation process, except for the initial discharge when irreversible polymerization in between C 60 nanoclusters existed as suggested by the characteristic irreversible peak shifts in both in situ XRD pattern and in situ Raman spectra. Cs‐corrected transmission electron microscope corroborated these phase evolutions. Importantly, delithiation potentials derived from density‐functional‐theory simulation based on proposed phase structures qualitatively consists with experimental ones.
Publisher: Elsevier BV
Date: 11-2021
Publisher: American Chemical Society (ACS)
Date: 20-01-2022
DOI: 10.1021/ACS.NANOLETT.1C04709
Abstract: Zinc metal anodes show great promise for cheap and safe energy storage devices. However, it remains challenging to regulate highly efficient Zn plating/stripping under a high depth of discharge (DOD). Guided by density functional theory calculation, we here synthesized an oxygen- and nitrogen-codoped carbon superstructure as an efficient host for high-DOD Zn metal anodes through rational monomer selection, polymer self-assembly, and structure-preserved carbonization. With microscale 3D hierarchical structures, microcrystalline graphitic layers, and zincophilic heteroatom dopants, a flower-shaped carbon (C
Publisher: Wiley
Date: 15-06-2022
DOI: 10.1002/CEY2.231
Abstract: Direct recycling has been regarded as one of the most promising approaches to dealing with the increasing amount of spent lithium‐ion batteries (LIBs). However, the current direct recycling method remains insufficient to regenerate outdated cathodes to meet current industry needs as it only aims at recovering the structure and composition of degraded cathodes. Herein, a nickel (Ni) and manganese (Mn) co‐doping strategy has been adopted to enhance LiCoO 2 (LCO) cathode for next‐generation high‐performance LIBs through a conventional hydrothermal treatment combined with short annealing approach. Unlike direct recycling methods that make no changes to the chemical composition of cathodes, the unique upcycling process fabricates a series of cathodes doped with different contents of Ni and Mn. The regenerated LCO cathode with 5% doping delivers excellent electrochemical performance with a discharge capacity of 160.23 mAh g −1 at 1.0 C and capacity retention of 91.2% after 100 cycles, considerably surpassing those of the pristine one (124.05 mAh g −1 and 89.05%). All results indicate the feasibility of such Ni–Mn co‐doping‐enabled upcycling on regenerating LCO cathodes.
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 08-2023
Publisher: Springer Science and Business Media LLC
Date: 28-11-2200
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: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 12-2019
No related grants have been discovered for Nianji Zhang.