1. 完整的交钥匙解决方案,提供原位微分电化学质谱仪DEMS整套系统(主机+附件)
电池领域:DEMS主机+前处理系统+电池模具+载气系统
电催化领域:DEMS主机+进样系统+各类电化学池(适用于各种催化剂载体形式)
2. 提供实验细节经验、数据分析方法,有大量成熟的分析测试方法,无需客户搭建实验体系,摸索测试细节方案,节省用户宝贵时间。
3. 客户情况:北京大学、清华大学……百余所高校及宁德时代、宁德新能源、德方纳米等企业。
4. 服务客户已在知名国际期刊(J. Am. Chem. Soc./Angew. Chem./Adv. Mater./Adv. Energy Mater./ACS Catal./Appl. Catal./Adv. Funct. Mater./Energy Storage Mater.等)发表高水平论文200篇左右。
1. 原位电化学质谱DEMS(电池应用&电催化应用)
能够原位分析锂离子电池、钠离子电池、金属空气电池等储能器件在运行过程中产生或消耗的微量气体,可以实时分析检测电池运行的不同阶段的气体消耗或生成情况,从而获得电化学反应中气体参与或气体释放的定性定量信息。
(4)
钠离子电池
正极首次充电O
2
析出检测;
(8)
Li-O
2
电池
充放电过程O
2
检测;
(9)
Li-CO
2
电池
充放电过程中CO
2
气体检测;
(10)
Li-N
2
电池
充放电过程中N
2
气体检测
Operando DEMS results for (a) PL and (b) LF-10 electrodes. The black solid lines and brown dots correspond to the voltage profile and O
2
evolution, respectively
A
ngew.Chem.2020,132,23261-23266
DEMS profiles during the first charging process of a) the Bare-LCO and b) the OIN-LCO to 4.6 V
3. 高镍正极材料首次充电O
2
和CO
2
析出定量检测
O
2
and CO
2
evolution rates during in-situ DEMS measurements and the corresponding voltage profiles of NCA and NCAT1 cycled at 0.1C between 3.0 and 4.7 V
https://doi.org/10.1016/j.joule.2022.01.002
5. Li-O
2
电池充放电过程O
2
检测
Li-O
2
电池DEMS analyses in the Swagelok LOBs without (e, f) 0.5 mg ml-1 Au nanocolloid electrolyte in discharge (e) and charge (f) processes.
ACS Appl. Mater.Interfaces, 2021, D01:10.1021/acsami.0c20871
原位微分电化学质谱仪(DEMS)在电催化测试中,依靠真空压差作为动力,通过阻水透气膜将电极表面电化学反应产生的气体或挥发性产物或中间产物在毫秒时间内,抽取到质谱仪中,从而实现高灵敏度、高分辨率地检测到产物,主要应用于MOR,EOR,CO2RR,HER,OER,ORR,NRR,硝酸根还原,氨氧化等电催化反应中。
1. CO
2
电催化还原气相产物(CO,CH
4
,C
2
H
4
,CH
3
OH等)瞬时检测,相对法拉第效率测定
2. 硝酸根电催化还原中NO,N
2
O,NH
2
OH,NH
3
,N
2
等中间产物或最终产物原位检测
3. 电解水OER同位素标记
1
8
O,LOM或AEM反应机理确认
4. 甲醇电氧化反应中间产物或最终产物(HCHO,HCOOH,CO等)瞬时检测及各产物电流效率计算
5. 氢同位素标记,氢气析出反应(HER)机理解析
6. 碳材料稳定性评估(高电位下CO,CO
2
检测)
7. 其他(光催化,光电催化,氧还原,氢氧化,氯气析出,有机电合成等)
Linear Sweep Voltammetry during DEMS mearements: applied voltage from 0.05 to -0.95V. The NRA performance was recorded versus a saturated calomel electrode(SCE)in 0.5M Na
2
SO
4
electrolyte with 200 ppm nitrate-N. DEMS measurements of NRA over Cu/Cu
2
O NWAs.
Angew. Chem. Int. Ed. 10.1002/anie.201915992
2. 电解水OER同位素标记
1
8
O,LOM或AEM反应机理确认
DEMS signals of
3
2
O
2
(
15
O
16
O) and
34
O
2
(
16
O
18
O) from the reaction products for
18
O-labeled SrRulr and RuO
2
catalysts in H
2
18
O aqueous sulfuric acid electrolyte and corresponding CV cycles. The mass spectroscopy signals are baseline subtracted.
J. Am. Chem. Soc. 2021, 143, 17, 6482-6490
Simultaneously recorded CV and MSCVs for methanol electrooxidation on Pt/C in 1 M methanol and 0.5 M H
2
SO
4
solution at the scan rate of 1 mV s
-
1
. Electrolyte flow rate of 2.67ml min
-
1
, distance of 50 µm. Arrows indicate the direction of potential scan.
Journal of Power Sources 509 (2021) 230397
4. 氢同位素标记,氢气析出反应(HER)机理解析
DEMS signals at m/z=2,3 and 3 at a pulsed potential of 0.3V RHE over the Cu catalyst in 1 M KOH with 50 mM deuterated benzaldehyde.
Nature catalysis, 2022,5,66-73
(a)Polarization curves of Au(hkl) recorded in a CO
2
-saturated 0.1 M KHCO
3
solution at 1 mV/s. (b) Normalized Q-mass ion currents for hydrogen, carbon monoxide, and methane detected by OLEMS with dependence of the applied cathodic potential. Insets are magnififications of the onset potential regions.
ACS catal. 2019,9,1383-1388
适用于锂离子电池、锂硫电池、钠离子电池、锂氧气电池、锌离子电池等非水系或水系电池体系,探究正极材料、负极材料、SEI膜、电解液分解、溶剂化以及锂离子动力学行为。
In situ ATR-FTIR spectra of the NbO
2
electrode surface during the initial two charge-discharge
cycles of the NbO
2
|LiMn
2
O
4
full cell. The SEI formation on the NbO
2
electrode starts in the charging at 2.0 V; both TFSI and MU contribute to the SEI formation.
https://doi.org/10.1016/j.joule.2022.01.002
利用分子振动的特征吸收,红外光谱可以用于原位检测固体电极上的吸附态物种,从而:(1) 关键中间产物的识别和构型鉴定,(2)确定电极表面成键状态(3)优先的反应路径和选择性确认(4)探究反应环境的影响,如电解液阴离子,阳离子,pH, 添加剂等(5)电极电解液界面双电层的探测。适用于水系或非水系电催化反应,如CO2RR, HER, OER, ORR, MOR, EOR, NRR,硝酸根还原,有机电合成等。
外反射模式(IRRAS)
可得到吸附态和溶液相中间产物或最终产物信息
原位ATR-SEIRAS光谱,将施加的电位从-0.4降低到-1.8V,同时记录所有光谱
Nature Communications
, 2022 13:63
In-situ
ATR-SEIRAS spectra recorded during stepping the potential from 0.2 to −0.15 V
vs.
RHE in H
2
-saturated 0.1 M KOH electrolyte for
a
-
b
Ru/C,
c
-
d
Ru
7
Ni
3
/C and
e
-
f
Acid-Ru
7
Ni
3
/C.
Nature Communications, 2020 11:5651
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