广大师生：

华南理工大学“海内外优秀青年学者论坛”旨在面向全球邀请拥有不同学术背景的青年才俊，围绕国际科学前沿、热点研究领域以及行业产业的技术问题等展开探讨和交流。通过这个平台，互相启迪、开拓视野，增强国际交流与合作，促进双方共同发展。本次论坛的具体安排如下：

一、论坛时间

2018年4月22日上午

二、地点

华南理工大学发光材料与器件国家重点实验室502会议室

三、论坛议程

附：

报告题目：Rechargeable Hydrogen Batteries for Large-Scale Energy Storage

内容摘要:The ever-increasing global energy consumption has driven the development of renewable energy technologies to reduce the greenhouse gas emission and air pollution. Electrochemical energy storage devices, such as batteries, are critical for enabling renewable yet intermittent sources of solar and wind. Batteries including lithium ion, lead acid, redox flow, and liquid metal show promise for grid-scale storage, but they are still far from meeting the grid-storage needs such as low cost, long cycle life, reliable safety, and reasonable energy density for cost and footprint reduction. In this talk, I will firstly introduce a new rechargeable battery chemistry of manganese-hydrogen battery, where the cathode is cycled between soluble Mn²⁺ and solid MnO₂ with a two-electron reaction, and the anode is cycled between H₂ gas and H₂O through well-known catalytic reactions of hydrogen evolution and oxidation.¹ This battery chemistry exhibits a discharge voltage of ~ 1.3 V, rate capability of 100 mA cm^-2 (36 seconds of discharge), and a lifetime of over 10000 cycles without decay. We achieve a gravimetric energy density of ~139 Wh kg^-1 (volumetric energy density of ~ 210 Wh L^-1), with the theoretical gravimetric energy density of ~174 Wh kg^-1 (volumetric energy density of ~ 263 Wh L^-1) in a 4 M MnSO₄ electrolyte. The manganese-hydrogen battery involves low-cost abundant materials and has potential to be scaled-up for large-scale energy storage. In the second part of the talk, I will present a novel in situ electrochemical oxidation tuning approach to develop a series of binary, ternary, and quaternary transition metal (e.g., Co, Ni, Fe) oxides from their corresponding dichalcogenides (sulfides, selenides and tellurides) as highly active catalysts for enhanced oxygen evolution reaction.^2,3 In the last part of the talk, I will present transition metal oxides/sulfides based supercapacitors with high power densities for energy storage applications.^4,5

1.      Wei Chen, Yi Cui, et al., A Manganese-Hydrogen Battery with Potential for Grid-Scale Energy Storage, Nature Energy, 2018, In Press.

2.      Wei Chen, Yi Cui, et al., In Situ Electrochemically Derived Nanoporous Oxides from Transition Metal Dichalcogenides for Active Oxygen Evolution Catalysts, Nano Letters, 2016, 16 (12), 7588-7596.

3.      Wei Chen, Yi Cui, et al., In Situ Electrochemical Oxidation Tuning of Transition Metal Disulfides to Oxides for Enhanced Water Oxidation, ACS Central Science, 2015, 1 (5), 244-251.

4.      Wei Chen, H. N. Alshareef, et al., One-Step Electrodeposited Nickel Cobalt Sulfide Nanosheet Arrays for High-Performance Asymmetric Supercapacitors, ACS Nano, 2014, 8 (9), 9531-9541.

5.      Wei Chen, Yi Cui, H. N. Alshareef, et al., High Performance Nanostructured Supercapacitors on a Sponge, Nano Letters, 2011, 11 (12), 5165–5172.

报告人简介:陈维博士于2008年6月在北京科技大学获得学士学位，2013年12月于沙特阿卜杜拉国王科技大学获得博士学位。2014年4月至今在美国斯坦福大学从事博士后研究。从事纳米材料的制备及其在电催化电化学储能方面的应用研究。至今已发表文章34篇，获得专利2个。