24小时热门版块排行榜    

北京石油化工学院2026年研究生招生接收调剂公告
查看: 2805  |  回复: 11
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

人人0

新虫 (初入文坛)


[交流] 关于ECAS的求法请大牛解惑

本人电催化刚入门的一个新虫近日看到两篇文章ECAS的算法有些不明白,求大神指导
1、Calculation of ECAS: The calculation of electrochemically active surface area (ECAS) is estimated from the double layer capacitance (Cdl) of the different catalysts in 1 M KOH based on the previous published report.1-3 The charging current (ic) was measured from the CVs at different scan rates, as shown in Figure S4c and Figure S13. The relation between ic, the scan rate (ν) and the Cdl was given in equation (1). ic = νCdl,Therefore, the slope of ic as a function of ν is equal to Cdl. For the calculation of ECAS, the specific capacitance (Cs) value is 0.040 mF cm-2 in 1 M KOH. So the ECAS of is calculated according to equation (2). ECSA=Cdl/Cs。 文章题目:A General Approach to Ultrathin NiM (M = Fe, Co, Mn) Hydroxide Nanosheets as High-Performance Low-Cost Electrocatalysts for Overall Water Splitting
这个是说用Cdl/Cs,但是Cs直接给出了,这个是需要测的吗?如果需要测那么测试的电流密度是多大的?
2、Estimation of Effective Electrode Surface Area. Based on literature, cyclic voltammetry (CV) could be carried out in neutral media to probe the electrochemical double layer capacitance of various samples at non-Faradaic overpotentials as the means for estimating the effective electrode surface areas. Accordingly, a series of CV measurements were performed at various scan rates (4 mV s-1, 8 mV•S-1, 12 mV•S-1, 16 mV•S-1, etc.) in 0.104 to 0.204 V vs. RHE range, and the sweep segments of the measurements were set to 10 to ensure consistency. By plotting the difference in current density (J) between the anodic and cathodic sweeps (Janodic - Jcathodic) at 0.15 V vs. RHE against the scan rate, a linear trend was observed. The slope of the fitting line is found to be equal-to-twice the geometric double layer capacitance (Cdl), which is proportional to the effective electrode surface area of the materials. Therefore, the electrochemical surface areas of different samples can be compared with one another based on their Cdl values. However, it should be noted that this comparison makes sense only when the measurement of materials are carried out under same condition.
这个是那另外一个材料进行比较,把二者之间的Cdl都给求出来,我们的材料是直接长在泡沫镍上片的如果要对比的话需要选用什么样的材料,其实对整个过程还是有些糊涂求大神详解。
3、是没有在文献查找是在网上的查到的,是利用可根据Randles-Sevcik公式在25°C时,ip=(2.69×105)n3/2ADo1/2ν1/2C (没法下标这个公式有点乱那个是10的五次方不是105)。0.05mM K3Fe(CN)6 (0.1M KCl)其扩散系数 Do=7.6*10-6。在此溶液中根据不同扫速做ip与V1/2的关系来求A。这个方法适合什么样的样品?我们现在做的是过渡金属化合物直接长在泡沫镍上,不知道能不能用。
希望各位大牛能够提供帮助
回复此楼

» 猜你喜欢

» 本主题相关商家推荐: (我也要在这里推广)

» 抢金币啦!回帖就可以得到:

查看全部散金贴

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

waner_fei

禁虫 (初入文坛)


人人0(金币+2): 谢谢参与
本帖内容被屏蔽

9楼2017-11-23 15:38:33
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 12 个回答

人人0

新虫 (初入文坛)


自己顶一下吧 坐等大神
5楼2017-11-07 08:05:04
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

匿名


★ ★ ★ ★
人人0(金币+2): 谢谢参与
人人0(小毛球代发): 金币+3, 感谢参与 2018-12-11 08:51:32
本帖仅楼主可见
10楼2018-12-11 08:49:14
已阅   申请ECEPI   回复此楼   编辑   查看我的主页

绯红的长发

新虫 (初入文坛)



人人0(金币+1): 谢谢参与
我也在想这个问题,第一个我也不清楚为啥求得了Cs的值我看的这个文献给了个参考文献:Anothumakkool, B.; Torris A. T, A.; Bhange, S. N.; Badiger, M. V.; Kurungot, S.Electrodeposited Polyethylenedioxythiophene with Infiltrated Gel Electrolyte Iinterface: A Close Contest of an All-Solid-State Supercapacitor with its Liquid-State Counterpart. Nanoscale 2014,6, 5944–5952.
希望对你有帮助。第二个意思是说在同一条件下测得Cdl值由于线性关系和ECAS一样的。能看到谁最好就可以了。
第三个你说的那个公式没看明白。
11楼2018-12-27 15:55:39
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
简单回复
xhmaohan6楼
2017-11-07 08:18   回复  
人人0(金币+2): 谢谢参与
发自小木虫Android客户端
erjianxin4楼
2017-11-07 07:18   回复  
人人0(金币+2): 谢谢参与
发自小木虫Android客户端
nono20093楼
2017-11-07 06:49   回复  
人人0(金币+2): 谢谢参与
发自小木虫Android客户端
eceshi_Z2楼
2017-11-06 16:08   回复  
人人0(金币+2): 谢谢参与
1 发自小木虫Android客户端
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 317分 一志愿南理工材料工程 本科湖工大 求调剂 +7 芋泥小铃铛 2026-03-28 7/350 2026-03-28 21:38 by 小木虫tim
[考研] 材料与化工272求调剂 +9 阿斯蒂芬2004 2026-03-28 9/450 2026-03-28 15:21 by 1018329917
[考研] 317求调剂 +6 十闲wx 2026-03-24 6/300 2026-03-28 13:27 by Iveryant
[考研] 266分,求材料冶金能源化工等调剂 +7 哇呼哼呼哼 2026-03-27 9/450 2026-03-28 12:22 by zllcz
[考研] 材料277求调剂 +7 min3 2026-03-24 7/350 2026-03-28 11:39 by xuxiang
[考研] 一志愿211院校 344分 东北农业大学生物学学硕,求调剂 +5 丶风雪夜归人丶 2026-03-26 8/400 2026-03-27 19:22 by 丶风雪夜归人丶
[考研] 266分求材料化工冶金矿业等专业的调剂 +4 哇呼哼呼哼 2026-03-26 4/200 2026-03-27 17:02 by zhyzzh
[考研] 一志愿 西北大学 总分282 英语一62 求调剂 +7 18419759900 2026-03-25 8/400 2026-03-27 16:38 by 18419759900
[考研] 一志愿北京化工大学 070300 学硕 336分 求调剂 +9 vv迷 2026-03-22 9/450 2026-03-27 15:59 by 不吃魚的貓
[考研] 287求调剂 +10 land xuxu 2026-03-26 10/500 2026-03-27 15:33 by 帕尔马拉特
[考研] 08开头275求调剂 +4 拉谁不重要 2026-03-26 4/200 2026-03-27 14:12 by Delta2012
[考研] 303求调剂 +7 安忆灵 2026-03-22 8/400 2026-03-27 11:46 by sanrepian
[考研] 317求调剂 +7 蛋黄咸肉粽 2026-03-26 7/350 2026-03-27 02:29 by fmesaito
[考研] 085602 289分求调剂 +8 WWW西西弗斯 2026-03-24 8/400 2026-03-26 16:33 by 不吃魚的貓
[考研] 281求调剂 +6 Koxui 2026-03-24 7/350 2026-03-26 15:37 by 无际的草原
[考研] 一志愿 南京邮电大学 288分 材料考研 求调剂 +3 jl0720 2026-03-26 3/150 2026-03-26 13:39 by zzll406
[考研] 0854AI CV方向招收调剂 +4 章小鱼567 2026-03-23 4/200 2026-03-25 17:04 by CoderLoser
[考研] 各位老师您好:本人初试372分 +5 jj涌77 2026-03-25 6/300 2026-03-25 14:15 by mapenggao
[考研] 材料专硕找调剂 +5 哈哈哈吼吼吼哈 2026-03-23 5/250 2026-03-24 19:07 by 了了了了。。
[考研] 384求调剂 +3 子系博 2026-03-22 6/300 2026-03-23 21:45 by 子系博
信息提示
请填处理意见