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660 results on '"Guo, Baochun"'

101. Efficient hydrogen evolution of Ni2P via incorporation of Mo for alkaline freshwater and seawater electrolysis.

Author

Li, Xiao, Wu, Yudong, Li, Shanshan, Dai, Yinchen, Guan, Jibiao, Guo, Baochun, and Zhang, Ming

Subjects
HYDROGEN evolution reactions, ELECTROLYSIS, SEAWATER, FRESH water, ALKALINE solutions, HYDROGEN production, ABATEMENT (Atmospheric chemistry)
Abstract

Developing high-performance and earth-abundant electrocatalysts for hydrogen production by electrolysis of freshwater/seawater is desirable but remains a huge challenge, especially in seawater solution. Herein, we report an efficient catalyst for a cathode consisting of three-dimensional standing arrays of Mo-Ni2P/CC nanosheets uniformly grown on carbon cloth, in which the Mo doping improved the HER properties of Ni2P by providing applicable morphology, electronic properties and active sites. It is found that the as-obtained catalyst shows superior HER activity with a low overpotential of 113 and 154 mV at 10 mA cm−2 in 1 M KOH and simulated alkaline seawater solution, respectively. Moreover, the Mo–Ni2P/CC catalyst exhibits favorable stability in 5000 CV cycles in 1 M KOH and reasonable stability in a 20 h stability test in alkaline, simulated seawater and alkaline seawater solution. This work may provide a feasible insight into the construction and development of high-efficiency HER electrocatalysts for freshwater/seawater electrolysis. [ABSTRACT FROM AUTHOR]

Published
2022
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128. Colossal permittivity and low dielectric loss behaviors in (Re0.5Nb0.5)0.005Ti0.995O2 (re = La, Nd, Sm and Gd) ceramics.

Author

Guo, Baochun and Cui, Xiulei

Subjects
*SAMARIUM, *PERMITTIVITY, *DIELECTRIC properties, *CERAMICS, *CRYSTAL grain boundaries, *DIELECTRIC loss, *RUTILE
Abstract

A series of co-doped TiO2 ceramics named (Re0.5Nb0.5)0.005Ti0.995O2 (Re = La, Nd, Sm, Gd) were prepared by a solid-state reaction method. The microstructure, dielectric properties, and impedance spectra of (Re0.5Nb0.5)0.005Ti0.995O2 ceramics were systematically investigated in detail. The co-doped TiO2 with rutile structure ceramics possessing CP and low dielectric loss (<0.05) have been gotten. Low dielectric loss is attributed to enhancing grain boundary resistance and suppressing Maxwell–Wagner polarization This work maybe give us enlightenment about how to find low dielectric loss in co-doped TiO2 CP ceramics. [ABSTRACT FROM AUTHOR]

Published
2022
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147. Separating Charge Centers of Chain Segments in Dielectric Elastomer through Steric Hindrance Engineering.

Author

Chen, Yifu, Wu, Siwu, Guo, Baochun, Jin, Binjie, Yang, Haixin, Chen, Jialiang, Wu, Wenjie, and Zhang, Liqun

Abstract

Theoretically, separating the positive and negative charge centers of the chain segments of dielectric elastomers (DEs) is a viable alternative to the conventional decoration of chain backbone with polar handles, since it can dramatically increase the dipole vector and hence the dielectric constant (ε′) of the DEs while circumvent the undesired impact of the decorated polar handles on the dielectric loss (tan δ). Herein, a novel and universal method is demonstrated to achieve effective separation of the charge centers of chain segments in homogeneous DEs by steric hindrance engineering, i.e., by incorporating a series of different included angle‐containing building blocks into the networks. Both experimental and simulation results have shown that the introduction of these building blocks can create a spatially fixed included angle between two adjacent chain segments, thus separating the charge center of the associated region. Accordingly, incorporating a minimal amount of these building blocks (≈5 mol%) can lead to a considerably sharp increase (≈50%) in the ε′ of the DEs while maintaining an extremely low tan δ (≈0.006@1 kHz), indicating that this methodology can substantially optimize the dielectric performance of DEs based on a completely different mechanism from the established methods. [ABSTRACT FROM AUTHOR]

Published
2024
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