亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Switching on electrocatalytic activity in solid oxide cells

电极 电解质 材料科学 电解 氧化物 氧化剂 纳米技术 电解水 阴极 化学工程 化学 冶金 工程类 物理化学 有机化学
作者
Jae‐ha Myung,Dragos Neagu,David Miller,John T. S. Irvine
出处
期刊:Nature [Nature Portfolio]
卷期号:537 (7621): 528-531 被引量:495
标识
DOI:10.1038/nature19090
摘要

A new way of activating the electrodes in solid oxide cells involves applying an electrical potential to trigger the exsolution of metal catalysts to the electrode surface; the success of this technique raises the possibility of regenerating the electrodes during operation. Incorporating nanostructured electrodes into solid oxide fuel cells improves performance by increasing the active surface area and therefore increasing electrocatalytic activity. However, fabrication of such electrodes by physical or chemical deposition can be complex. Redox exsolution of nanoparticles from a parent perovskite was shown recently to be a viable means of producing electrodes with enhanced stability. Here, John Irvine and colleagues demonstrate that similar exsolution can be achieved by simply poling the cell for a few seconds, rather than the lengthy redox processes previously used. The resulting cells are highly stable in fuel and electrolysis modes, showing that high-performing electrodes can be fabricated quickly and easily in situ. Solid oxide cells (SOCs) can operate with high efficiency in two ways—as fuel cells, oxidizing a fuel to produce electricity, and as electrolysis cells, electrolysing water to produce hydrogen and oxygen gases. Ideally, SOCs should perform well, be durable and be inexpensive, but there are often competitive tensions, meaning that, for example, performance is achieved at the expense of durability. SOCs consist of porous electrodes—the fuel and air electrodes—separated by a dense electrolyte. In terms of the electrodes, the greatest challenge is to deliver high, long-lasting electrocatalytic activity while ensuring cost- and time-efficient manufacture1. This has typically been achieved through lengthy and intricate ex situ procedures. These often require dedicated precursors and equipment1,2,3; moreover, although the degradation of such electrodes associated with their reversible operation can be mitigated4, they are susceptible to many other forms of degradation5. An alternative is to grow appropriate electrode nanoarchitectures under operationally relevant conditions, for example, via redox exsolution6,7,8,9,10. Here we describe the growth of a finely dispersed array of anchored metal nanoparticles on an oxide electrode through electrochemical poling of a SOC at 2 volts for a few seconds. These electrode structures perform well as both fuel cells and electrolysis cells (for example, at 900 °C they deliver 2 watts per square centimetre of power in humidified hydrogen gas, and a current of 2.75 amps per square centimetre at 1.3 volts in 50% water/nitrogen gas). The nanostructures and corresponding electrochemical activity do not degrade in 150 hours of testing. These results not only prove that in operando methods can yield emergent nanomaterials, which in turn deliver exceptional performance, but also offer proof of concept that electrolysis and fuel cells can be unified in a single, high-performance, versatile and easily manufactured device. This opens up the possibility of simple, almost instantaneous production of highly active nanostructures for reinvigorating SOCs during operation.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
11秒前
英俊的铭应助自由的寄灵采纳,获得10
11秒前
enchanted发布了新的文献求助10
15秒前
科研通AI2S应助hob采纳,获得30
16秒前
研友_VZG7GZ应助科研通管家采纳,获得10
19秒前
Jasper应助科研通管家采纳,获得10
19秒前
烟花应助Demi采纳,获得10
23秒前
Demi完成签到,获得积分10
26秒前
31秒前
文欣完成签到 ,获得积分10
32秒前
33秒前
Cain发布了新的文献求助10
36秒前
hahhhah完成签到 ,获得积分10
37秒前
Demi发布了新的文献求助10
37秒前
邓亚楠完成签到,获得积分10
39秒前
Cici发布了新的文献求助10
40秒前
朴实云应完成签到,获得积分10
43秒前
侯海察完成签到,获得积分10
45秒前
彭于晏应助Demi采纳,获得10
48秒前
49秒前
自由冰凡完成签到 ,获得积分10
55秒前
侯海察发布了新的文献求助10
1分钟前
JamesPei应助sljzhangbiao11采纳,获得10
1分钟前
1分钟前
简单山水发布了新的文献求助10
1分钟前
1分钟前
jinx123456完成签到,获得积分10
1分钟前
不高兴发布了新的文献求助10
1分钟前
1分钟前
传奇3应助简单山水采纳,获得10
1分钟前
1分钟前
ly发布了新的文献求助10
1分钟前
scxl2000完成签到 ,获得积分10
1分钟前
邓亚楠发布了新的文献求助10
1分钟前
泽Y完成签到 ,获得积分10
1分钟前
青岚完成签到 ,获得积分10
1分钟前
Tumumu完成签到,获得积分10
1分钟前
1分钟前
1分钟前
1分钟前
高分求助中
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3990012
求助须知:如何正确求助?哪些是违规求助? 3532068
关于积分的说明 11256227
捐赠科研通 3270933
什么是DOI,文献DOI怎么找? 1805123
邀请新用户注册赠送积分活动 882270
科研通“疑难数据库(出版商)”最低求助积分说明 809216