相关实验视频

Updated: Sep 14, 2025

Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets

Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets

Published on: August 18, 2023

无形氧化外封闭了硫化,用于在低过电势下进行电化学水氧化

Ying Gu¹, Li Zhou¹, Siqing Li¹

¹School of Chemistry and Chemical Engineering, Nantong University, Nantong, 226019, China.

Chemistry (Weinheim an der Bergstrasse, Germany)

|July 22, 2025

概括

一种新的硫化/氧化催化剂促进了氧化演化反应 (OER) 进行水分裂. 这种工程材料表现出卓越的活性和稳定性,为贵金属催化剂提供了一个有希望的替代品.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

过渡金属硫化物对演化反应 (HER) 有希望,但在性介质中缺乏足够的氧演化反应 (OER) 活性.
活性位点的不稳定性和在高电位下缓慢的动力学阻碍了OER的性能.

研究的目的:

开发一种具有增强OER活性和稳定性的新型电催化剂,用于整体水分.
设计一种具有独特无形/晶体接口的异构结构,以提高催化性能.

主要方法:

通过渐变相控制合成了一个层次化的NiS_x/Ni(OH) ₂催化剂.
催化剂具有相混合的NiS和Ni₃S₂ (NiS_x) 核心,被无形的Ni(OH) ₂外封装.
研究了NiS_x用于电子运输和无形Ni(OH)₂用于表面激活和保护的协同效应.

主要成果:

在160mV的超电位下达到100mA cm−2的电流密度,显著超过Ni(OH) 2 (446mV) 和NiS_x (212mV).
在200小时的连续电解中,经过2%以下的活动衰变,证明了卓越的操作稳定性.
无形的Ni (OH) 2外提供了动态的表面协调和保护.

结论:

设计的NiS_x/Ni(OH) ₂异构结构有效地解决了性条件下的OER限制.
这一战略为水分应用的非贵金属电催化剂的商业化提供了一个可行的途径.

关键词:

无形/晶体相位界面接口低超电位的低超电位.硫化是什么?硫化是什么?硫化是什么?水的氧化过程中的氧化.

更多相关视频

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Published on: June 21, 2017

相关概念视频

Electrodeposition

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

Precipitation Gravimetry

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...

Voltaic/Galvanic Cells

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...