公开(公告)号：US20160376716A1

公开(公告)日：2016-12-29

申请号：US14925431

申请日：2015-10-28

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Jeung Ku KANG ,  Dong Ki LEE ,  Gyu Heon LEE ,  Yong-Hoon KIM ,  Ji Il CHOI

IPC: C25B11/04

CPC classification number: C25B11/0478 ,  C02F2305/10 ,  Y02E10/52 ,  Y02P20/134

Abstract: Disclosed is a method for improving solar energy conversion efficiency of a metal oxide semiconductor photocatalyst, which includes rapidly performing hydrogenation and nitrogenation of a metal oxide semiconductor material through an H2/N2 mixed gas plasma treatment in a single process at room temperature, so as to enhance photocatalytic energy conversion efficiency. Specifically, disclosed is a treatment technique in which a plasma ball formed by controlling a mixing ratio of hydrogen gas to nitrogen gas in a range of 1:1 to 1:3 contacts with a surface of a metal oxide material, such that a great amount of oxygen vacancy and nitrogen elements are introduced in the surface of the metal oxide material to improve electron-hole pairs transfer ability thereof and decrease a size of the band-gap. A catalyst including the metal oxide material directly converts the solar energy into a compound by photocatalytic hydrogen generation and CO2 conversion.

Abstract translation: 公开了一种提高金属氧化物半导体光催化剂的太阳能转换效率的方法，其包括在室温下通过H 2 / N 2混合气体等离子体处理在单一工艺中迅速进行金属氧化物半导体材料的氢化和氮化，从而 提高光催化能量转换效率。 具体地说，公开了一种处理技术，其中通过控制氢气与氮气的混合比在1：1至1：3的范围内形成的等离子体球与金属氧化物材料的表面接触，使得大量 的氧空位和氮元素引入金属氧化物材料的表面，以改善其电子 - 空穴对转移能力并减小带隙的尺寸。 包括金属氧化物材料的催化剂通过光催化氢生成和CO 2转化将太阳能直接转化为化合物。

公开(公告)号：US20170054138A1

公开(公告)日：2017-02-23

申请号：US14978958

申请日：2015-12-22

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jeung Ku KANG ,  Gyu Heon LEE ,  Jung Woo LEE ,  Sang Jun KIM

IPC: H01M4/04 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/48 ,  H01M4/62

CPC classification number: H01M4/0428 ,  C01B32/186 ,  C01G23/053 ,  C01P2004/04 ,  C01P2004/64 ,  C01P2006/16 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/485 ,  H01M4/625 ,  H01M10/0525

Abstract: Disclosed is a negative electrode material for a lithium secondary battery, using a layer structure of porous graphene and metal oxide nanoparticles, with remarkably fast charge/discharge characteristics and long cycle life characteristics, wherein macropores of the porous graphene and a short diffusion distance of the metal oxide nanoparticles enable rapid migration and diffusion of lithium ions. The present invention may achieve remarkably fast charge/discharge behaviors and exceedingly excellent cycle life characteristics of 10,000 cycles or more even under a current density of 30,000 mA·g−1. Accordingly, the structure of the present invention may implement very rapid charge/discharge characteristics and stable cycle life characteristics while having high capacity by combining the structure with negative electrode nanostructures of the porous graphene network structure, and thereby being widely used in a variety of applications.

Abstract translation: 公开了一种使用多孔石墨烯和金属氧化物纳米粒子的层结构的锂二次电池用负极材料，具有非常快的充电/放电特性和较长的循环寿命特性，其中多孔石墨烯的大孔和短的扩散距离 金属氧化物纳米粒子能够快速迁移和扩散锂离子。 即使在30000mA·g-1的电流密度下，本发明也可以实现10,000次以上的充分/放电特性的极快的循环寿命特性。 因此，本发明的结构可以通过将结构与多孔石墨烯网络结构的负极纳米结构组合而具有高容量而实现非常快的充电/放电特性和稳定的循环寿命特性，从而广泛应用于各种应用中 。

公开(公告)号：US20170014813A1

公开(公告)日：2017-01-19

申请号：US15194985

申请日：2016-06-28

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jeung Ku KANG ,  Dong Ki LEE ,  Gyu Heon LEE ,  Yong-Hoon KIM ,  Ji Il CHOI

IPC: B01J27/24 ,  B01J23/42 ,  B01J37/02 ,  B01J35/02 ,  B01J37/08 ,  B01J37/34 ,  H01L31/18 ,  B01J35/00

CPC classification number: B01J27/24 ,  B01J21/063 ,  B01J23/755 ,  B01J35/0033 ,  B01J35/004 ,  B01J37/348 ,  B01J37/349

Abstract: The present invention discloses a method for improving solar energy conversion efficiency using metal oxide photocatalysts having an energy band of core-shell structure for ultraviolet (UV) ray and visible light absorption, comprising a first process of forming a nanoparticle thin film layer; a second process of preparing a core-shell metal oxide on metal oxide nanoparticles by a plasma reaction under a hydrogen and nitrogen gas atmosphere, and a third process of depositing a transition metal on surfaces of core-shell metal oxide nanoparticles to produce a photocatalyst for energy conversion. A great amount of oxygen vacancies is formed in a shell region by the core-shell metal oxide to achieve effects of improving transfer ability of electron-hole pairs excited by light, and extending a wavelength range of absorbable light to a visible light region by changing a band-gap structure.

Abstract translation: 本发明公开了一种使用金属氧化物光催化剂提高太阳能转换效率的方法，所述金属氧化物光催化剂具有用于紫外（UV）射线和可见光吸收的核 - 壳结构的能带，包括形成纳米颗粒薄膜层的第一工艺; 在氢气和氮气气氛下通过等离子体反应在金属氧化物纳米颗粒上制备核 - 壳金属氧化物的第二种方法，以及在核 - 壳金属氧化物纳米颗粒的表面上沉积过渡金属以产生光催化剂的第三种方法 能量转换。 通过核 - 壳金属氧化物在壳区域中形成大量的氧空位，以实现改善由光激发的电子 - 空穴对的转移能力的效果，并且通过改变可变光区域将可吸收光的波长范围扩展到可见光区域 带隙结构。