Jianfei Yu

Bio: Jianfei Yu is an academic researcher from Southeast University. The author has contributed to research in topics: Hydrogen production & Carbon. The author has an hindex of 1, co-authored 2 publications receiving 3 citations.

MoC/MAPbI3 hybrid composites for efficient photocatalytic hydrogen evolution.

Abstract: Metal halide perovskites, such as iodine methylamine lead (MAPbI3), have received extensive attention in the field of photocatalytic decomposition of HI for hydrogen evolution, due to their excellent photoelectric properties. In this paper, a new MAPbI3-based composite, MoC/MAPbI3, was synthesized. The results show that 15 wt% MoC/MAPbI3 has the best hydrogen production performance (38.4 μmol h−1), which is approximately 24-times that of pure MAPbI3 (1.61 μmol h−1). With the extension of the catalytic time, the hydrogen production rate of MoC/MAPbI3 reached 165.3 μmol h−1 after 16 h due to the effective separation and transfer of charge carriers between MoC and MAPbI3, showing excellent hydrogen evolution rate performance under visible light. In addition, the cycling stability of MoC/MAPbI3 did not decrease in multiple 4 h cycle tests. This study used the non-precious metal promoter MoC to modify MAPbI3, and provides a new idea for the synthesis of efficient MAPbI3-based composite catalysts.

A MOF derived Co-NC@CNT composite with a 3D interconnected conductive carbon network as a highly efficient cathode catalyst for Li–O2 batteries

Abstract: Lithium–oxygen batteries are considered to be one of the most promising next-generation energy storage devices due to their ultra-high theoretical specific capacity and relatively simple structure. Herein, Co-NC@CNTs with a 3D interconnected conductive carbon network were synthesized. Co-NC nanoparticles derived from ZIF-67 as carbon network nodes have micro/mesoporous structures, as well as rich Co species catalytic sites for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). And CNTs as carbon skeletons transfer electrons to enhance the conductivity. Additionally, the interconnected carbon network provides abundant space for accommodating the discharge products and prevents the reduction of catalytically active sites. Therefore, Co-NC@CNTs as a cathode catalyst for Li–O2 batteries show a high initial discharge capacity of 12572.2 mA h g−1 at 200 mA g−1, good rate capability (5865 mA h g−1@1000 mA g−1), and excellent cycling stability (145 cycles at 250 mA g−1) superior to that of Co-NC and pure CNT cathodes. This study provides effective approaches to design and fabricate promising cathodes to improve the performance of Li–O2 batteries.

Hollow Beaded Fe₃C/N-Doped Carbon Fibers toward Broadband Microwave Absorption

Abstract: Microwave-absorbing materials have attracted enormous attention for electromagnetic (EM) pollution. Herein, hollow beaded Fe3C/N-doped carbon fibers (Fe3C/NCFs) were synthesized through convenient electrospinning and subsequent thermal treatment. The special hollow morphology of the samples is conducive to achieve lightweight and broadband microwave absorption properties. The thermal treatment temperatures exhibit a significant impact on conductivity and EM properties. The broadest effective absorption bandwidth (EAB) is 5.28 GHz at 2.16 mm when the thermal treatment temperature is 700 °C, and the EAB can cover 13.13 GHz with a tunable absorber thickness from 1.0 to 3.5 mm when the thermal treatment temperature is 750 °C. The excellent microwave absorption properties of the samples are due to the synergistic effect of impedance matching and strong EM energy attenuation abilities. Hence, the magnetic hollow beaded Fe3C/NCFs are expected to be an attractive candidate material as a lightweight and efficient microwave absorber in the future.

Bismuthene as a versatile photocatalyst operating under variable conditions for the photoredox C H bond functionalization

Abstract: Recently, layered two-dimensional (2D) semiconductor materials composed of group 15 elements (pnictogens) are demonstrated as efficient photocatalysts in various applications. However, only little attention is given to the investigation of their catalytic properties, and even there is no example of the photocatalytic application of bismuthene so far. Here we report for the first time on the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation. 2D bismuthene is proven to be an efficient photocatalyst that can be operated under various reaction conditions including indoor light illumination, darkness, outdoors and low temperature for the photoredox C–H arylation of (hetero)arenes with high product yields. The presented bismuthene catalyzed photoredox C–H arylation protocol works efficiently on a broad substrate scope of (hetero)arenes with aryl diazonium salts bearing electron-withdrawing and electron-donating groups. Moreover, a density functional theory (DFT) study reveals mechanistic details that lie behind the catalytic activity of bismuthene.

Bismuthene as a versatile photocatalyst operating under variable conditions for the photoredox CH bond functionalization

Abstract: Recently, layered two-dimensional (2D) semiconductor materials composed of group 15 elements (pnictogens) are demonstrated as efficient photocatalysts in various applications. However, only little attention is to the investigation of their catalytic properties, and even there is no example of the photocatalytic application of bismuthene so far. Here we report for the first time on the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation. 2D bismuthene is proven to be an efficient photocatalyst that can be operated under various reaction conditions including indoor light illumination, darkness, outdoors and low temperature for the photoredox C–H arylation of (hetero)arenes with high product yields. The presented bismuthene catalyzed photoredox C–H arylation protocol works efficiently on a broad substrate scope of (hetero)arenes with aryl diazonium salts bearing electron-withdrawing and electron-donating groups. Moreover, a density functional theory (DFT) study reveals mechanistic details that lie behind the catalytic activity of bismuthene.