Publications by authors named "Zhengda He"

Rechargeable lithium-ion batteries with high energy density and fast-charging capability are vital for commercial applications. Disordered rocksalt (DRX) materials with a cation/anion ratio greater than one, achieved through additional lithium insertion, have emerged as promising high-rate anode candidates. Inspired by the previously reported LiVO (0 ≤ ≤ 2) anode, a comprehensive search was conducted for all potential redox centers using high-throughput density functional theory (DFT) computations.

View Article and Find Full Text PDF

Electroencephalogram (EEG) analysis plays an indispensable role across contemporary medical applications, which encompasses diagnosis, monitoring, drug discovery, and therapeutic assessment. This work puts forth an end-to-end deep learning framework that is uniquely tailored for versatile EEG analysis tasks by directly operating on raw waveform inputs. It aims to address the challenges of manual feature engineering and the neglect of spatial interrelationships in existing methodologies.

View Article and Find Full Text PDF
Article Synopsis
  • Doping nickel oxyhydroxide (NiOOH) with iron (Fe) significantly enhances its performance in the oxygen evolution reaction (OER).
  • The research utilized advanced calculations and modeling to show that at low Fe concentrations, Fe exhibits a low-spin state, which allows for high solubility and comparable bond lengths with Ni.
  • The study found that this low-spin state strongly contributes to the catalytic activity for OER, and the calculated overpotentials for Fe-doped and pure materials align with experimental values.
View Article and Find Full Text PDF

Pyrochlore compounds ( O) have a large applicability in various branches of science and technology. These materials are considered for use as effective ionic conductors for solid state batteries or as matrices for immobilization of actinide elements, amongst many other applications. In this contribution we discuss the simulation-based effort made in the Institute of Energy and Climate Research at Forschungszentrum Jülich and partner institutions regarding reliable computation of properties of pyrochlore and defect fluorite compounds.

View Article and Find Full Text PDF

The activity of Pt(111) electrodes for the hydrogen evolution reaction (HER) in 0.5M HSO solution is found to increase with continuous potential cycling in the HER potential region. In addition, the basic cyclic voltammograms obtained in 0.

View Article and Find Full Text PDF

Like many branches of science, not to mention culture in general, electrochemistry has a number of recurring topics: Areas of research that are popular for a certain time, then fade away as their possibilities seem to have been exhausted, only to return decades later as progress in experimental or theoretical techniques offer new possibilities for their investigation. A prime example are fuel cells, which have undergone five such cycles, but here we discuss a general concept of kinetics-the pre-exponential factor of a rate constant-which has undergone two such cycles. The first cycle was in the 1950-1980s, when the methods of electrochemical kinetics were developed, and the interpretation was based on transition-state theory.

View Article and Find Full Text PDF

A synthetic method to prepare a core-shell-structured Fe3O4@SiO2 as a safe nanovehicle for tumor cell targeting has been developed. Superparamagnetic iron oxide is encapsulated inside nonporous silica as the core to provide magnetic targeting. Carboxymethyl chitosan-folic acid (OCMCS-FA) synthesized through coupling folic acid (FA) with OCMCS is then covalently linked to the silica shell and renders new and improved functions because of the original biocompatible properties of OCMCS and the targeting efficacy of FA.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_sessiong6ddulj173kug64dv5lpl3nse8hoesme): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once