Xiaoping Dai

China University of Petroleum, Beijing

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Xin Zhang

China Academy of Engineering Physics

Guoyou Liu

CRRC (China)

Ian A. Wilson

Scripps Research Institute

Eric Koesema

Scripps Research Institute

Henry van den Bedem

University of California, San Francisco

Andreas Kreusch

Genomics Institute of the Novartis Research Foundation

Adam Godzik

University of California, Riverside

Lukasz Jaroszewski

University of California, Riverside

Slawomir K. Grzechnik

Qualcomm (United States)

Jeff Velasquez

Joint Center for Structural Genomics

Cooperative Institutions

China University of Petroleum, Beijing

129

Chinese Academy of Sciences

Joint Center for Structural Genomics

Scripps Research Institute

Stanford University

University of Chinese Academy of Sciences

Zhejiang University

Shanghai Jiao Tong University

Peking University

University of California, San Diego

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Nickel molybdate/cobalt iron carbonate hydroxide heterojunction with oxygen vacancy enables interfacial synergism to trigger oxygen evolution reaction

Journal of Colloid and Interface Science (2023)

Yonghao Gan Ying Ye Xiaoping Dai Xueli Yin Yihua Cao

Oxygen evolution

Overpotential

Cobalt hydroxide

10.1016/j.jcis.2023.12.060

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Citations (7)

Ordered mesoporous Mg-modified silica to confine MoS2 slabs with high sulfidation and dispersion for higher alcohol synthesis via CO hydrogenation

Fuel (2024)

Ziteng Ren Yihua Cao Xueli Yin Yonghao Gan Run Cai

Sulfidation

10.1016/j.fuel.2024.130915

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Citations (4)

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

ACS Sustainable Chemistry & Engineering (2019)

Meilin Cui Huihui Zhao Xiaoping Dai Yang Yang Xin Zhang

The chemical-coupled three-dimensional (3D) γ-MnOOH with CoOOH particles (γ-MnOOH/CoOOH) was fabricated through a two-step strategy involving a hydrothermal and reduction–oxidation process. The strong solid–solid interfacial interactions between γ-MnOOH rods and CoOOH particles feature the Mn–O–Co bond on the interface and a high valence state of cobalt in CoOOH. The branched γ-MnOOH/CoOOH composites demonstrate a significantly strengthened synergy effect for the oxygen evolution reaction (OER). The optimal B-MCO-0.1 (γ-MnOOH/CoOOH-0.1) shows an excellent OER performance, which requires an overpotential of 313 mV to reach the current density of 10 mA cm–2 with a lower Tafel slope (87 mV dec–1) and the strong durability in alkaline electrolyte. Specially, the intrinsic OER activity (versus electrochemical active surface area, ECSA) on B-MCO-0.1 at an overpotential of 420 mV is 16.3 and 8.9 times higher than those of γ-MnOOH and CoOOH, respectively. The results demonstrate that OER activity originates mainly from the interfacial coupling of γ-MnOOH and CoOOH. Our work highlights the vital function of the interfacial interactions in modulating the electronic structure of the active sites and suggests an effective avenue to rationally design highly active electrocatalysts.

Overpotential

Oxygen evolution

10.1021/acssuschemeng.9b02106

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Citations (36)

Catalysis by metal–organic frameworks: proline and gold functionalized MOFs for the aldol and three-component coupling reactions

RSC Advances (2014)

Lili Liu Xin Zhang Rang Shumin Ying Yang Xiaoping Dai

Homochiral MOFs were engineered using postsynthetic modification and a one-pot synthetic strategy. l-Proline functionalized IRMOF-3 show high ee for aldol reaction. Gold functionalized CUP-1 catalysts are highly efficient for the A³ coupling reaction.

Aldol reaction

Coupling reaction

Component (thermodynamics)

Reaction conditions

10.1039/c4ra01269k

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Citations (66)

Multicomponent Pt-based catalyst for highly efficient chemoselective hydrogenation of 4-carboxybenzaldehyde

Journal of Catalysis (2021)

Fang Xu Aixin Fan Zhen Wang Yao Wang Yunrui Li

Decarbonylation

Benzoic acid

10.1016/j.jcat.2021.07.019

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Citations (6)

Crystal structure of an aspartate aminotransferase (TM1255) from Thermotoga maritima at 1.90 Å resolution

Proteins Structure Function and Bioinformatics (2004)

Robert Schwarzenbacher Lukasz Jaroszewski F. von Delft Polat Abdubek Eileen Ambing

Thermotoga maritima

Thermus thermophilus

Pyridoxal phosphate

Transamination

10.1002/prot.10646

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Citations (17)

Multi-physics simulation in high power IGBT module design

Daohui Li Matthew Packwood Qi Fang Wei Zhou Yangang Wang

High power Insulated Gate Bipolar Transistor (IGBT) modules have been utilised in power electronics industrial applications, such as electrical vehicle, traction, renewable energy, et al. The power module with higher power density, higher voltage and current rating, higher switching frequency, higher operation temperature and much lower/higher storage temperature with lower cost is the development tendency driven by the highly competeting market. The standard 3.3kV/1500A single switch IGBT module with 190mm×140mm footprint has been re-designed using latest multiphysics simulation packages together with novel assembly processes and materials to consider electro-magnetic(EM) design, such as partial discharge, low parasitic inductance of module; to design and optimise thermal, mechanical performance of the module.

Insulated-gate bipolar transistor

Power Electronics

Power module

Ball grid array

Multiphysics

High Voltage

10.1109/eurosime.2016.7463369

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Citations (8)

Investigation of Vehicle-Oriented Double-Sided Cooling Power Module With BGA Technology

IEEE Journal of Emerging and Selected Topics in Power Electronics (2022)

Cheng Peng Wenhui Zhu Ke Pan Li Ran Xiaoping Dai

With the increasing power density and integration of power electronics for motor drive applications, lower parasitic parameters, higher heat dissipation, thermomechanical reliability, and manufacturability have become the focused requirements of automotive power modules. New structures and materials have been investigated for the packaging of power modules, and wire-bondless packaging technology has become a research focus. In this article, a wire-bondless power module packaging technology based on ball-grid array (BGA) was developed, and a double-sided cooling (DSC) power module was then fabricated and thoroughly investigated. Thermal, electrical, and mechanical properties of the BGA packaged module were analyzed from the aspects of electrothermal coupling, shear performance, and electrical test. Specifically, by using the BGA interconnection, the thermal resistance was decreased by 27.4% compared to the wire-bond module. Parasitic inductance of BGA-based module was measured to be 10.13 nH by the dynamic test under the conditions of 310 V/120 A, which decreased by 33.3% compared to the wire-bond module counterpart. The findings of this work can help advance the design and fabrication of power modules, specifically DSC power modules.

Ball grid array

Power module

Wire bonding

Power Electronics

Integrated circuit packaging

Electronic Packaging

Parasitic element

10.1109/jestpe.2022.3192519

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Citations (5)

Hybrid 3.3 kV/450 A half‐bridge IGBT power module with SiC Schottky barrier diodes

IET Power Electronics (2019)

Daohui Li Haoze Luo Yue Huang Xiang Li Qi Fang

This work presents a hybrid 3.3kV/450 A insulated-gate bipolar transistor (IGBT) power module, utilising the half-bridge topology. In contrast to the traditional fashion, each IGBT chip in this module is allocated with two anti-parallel silicon carbide (SiC) Schottky barrier diodes (SBDs). Each SBD describes smaller footprint than the conventionally used silicone (Si) based fast recovery diode at this voltage and current level. By adopting smaller SiC SBDs in this hybrid-style packaging structure, the SBD chip yield can be greatly improved, without any additional fabrication cost. To benchmark the advantages of this hybrid power module over the Si-based counterpart, both power modules are designed, fabricated as well as tested statically and dynamically. It is shown that while both types show similar thermal behaviour, the hybrid power module describes much lower IGBT turn-on current overshooting, diode reverse recovery loss and IGBT turn-on loss. Based on the measured results, the power losses of both modules under a three-phase inverter operation condition are calculated, showing that the hybrid module has considerably lower power losses and junction temperature rise.

Insulated-gate bipolar transistor

Flyback diode

Power module

Rectifier (neural networks)

PIN diode

10.1049/iet-pel.2019.0412

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Citations (3)

NiCo-DH nanodots anchored on amorphous NiCo-Sulfide sheets as efficient electrocatalysts for oxygen evolution reaction

Electrochimica Acta (2018)

Huihui Zhao Yang Yang Xiaoping Dai Hongyan Qiao Jiaxi Yong

Overpotential

Nanodot

Oxygen evolution

10.1016/j.electacta.2018.11.150

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Citations (53)