Electronic Structure and Crystalline Phase Dual Modulation via Anion–Cation Co-doping for Boosting Oxygen Evolution with Long-Term Stability Under Large Current Density

2019 ◽  
Vol 11 (38) ◽  
pp. 34819-34826 ◽  
Author(s):  
Jian Chen ◽  
Jianpo Chen ◽  
Hao Cui ◽  
Chengxin Wang
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Current Density ◽  
Crystalline Phase ◽  
Term Stability ◽  
Co Doping ◽  
Long Term Stability ◽  
Large Current ◽  
Large Current Density

A Novel Surface Preparation and Post-Etch Removal Technique for InGaAs Sidewalls

1997 ◽  
Vol 477 ◽  
Author(s):  
S. A. Tabatabaei ◽  
G. A. Porkolab ◽  
S. Agarwala ◽  
F. G. Johnson ◽  
S. A. Merritt ◽  
...  
Keyword(s):  
Current Density ◽  
Dark Current ◽  
High Speed ◽  
Surface Preparation ◽  
Reverse Bias Voltage ◽  
Dark Current Density ◽  
Term Stability ◽  
Long Term Stability ◽  
Removal Technique

ABSTRACTThis paper describes in detail a surface preparation, and post-etch removal technique developed for InGaAs sidewalls. It illustrates the results demonstrating the effect of sidewall post-etch, surface preparation, and surface passivation on the performance of high speed InGaAs detectors. Dark current density for circular diodes with a diameter size varying between 10 and 100 μm was measured at a reverse bias voltage of −5 V. The effectiveness of various surface preparation techniques was studied by measuring the immediate improvement in dark current density, as well as its long-term stability. The benefits of this new technique compared to other techniques we have investigated include improved device characteristics, long-term stability, as well as a much less critical process to achieve optimum surface properties.

NiFe (sulfur)oxyhydroxide porous nanoclusters/Ni foam composite electrode drives a large-current-density oxygen evolution reaction with an ultra-low overpotential

2019 ◽  
Vol 7 (32) ◽  
pp. 18816-18822 ◽  
Author(s):  
Yanqing Wang ◽  
Yuemeng Li ◽  
Liping Ding ◽  
Zhe Chen ◽  
Aaron Ong ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Composite Electrode ◽  
Ni Foam ◽  
Large Current ◽  
Foam Composite ◽  
Large Current Density ◽  
Low Overpotential

A NiFe (sulfur)oxyhydroxide porous nanoclusters/Ni foam composite electrode was fabricated and can drive a large-current-density oxygen evolution reaction with an ultra-low overpotential.

Iron tungsten mixed composite as a robust oxygen evolution electrocatalyst

2019 ◽  
Vol 55 (73) ◽  
pp. 10944-10947 ◽  
Author(s):  
Chizhong Wang ◽  
Rong Wang ◽  
Yue Peng ◽  
Jianjun Chen ◽  
Junhua Li
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Term Stability ◽  
Long Term Stability

An iron tungsten mixed composite exhibited a high activity and a long-term stability for oxygen evolution reaction electrocatalysis.

scholarly journals Amorphous outperforms crystalline nanomaterials: surface modifications of molecularly derived CoP electro(pre)catalysts for efficient water-splitting

2019 ◽  
Vol 7 (26) ◽  
pp. 15749-15756 ◽  
Author(s):  
Rodrigo Beltrán-Suito ◽  
Prashanth W. Menezes ◽  
Matthias Driess
Keyword(s):  
Water Splitting ◽  
Crystalline Phase ◽  
Surface Modifications ◽  
Term Stability ◽  
Long Term Stability ◽  
Overall Water Splitting ◽  
Low Overpotential

Amorphous CoP outperforms the crystalline phase in the OER, HER and overall water splitting with low overpotential and remarkable long-term stability.

scholarly journals Boride-derived oxygen-evolution catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ning Wang ◽  
Aoni Xu ◽  
Pengfei Ou ◽  
Sung-Fu Hung ◽  
Adnan Ozden ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Current Density ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Long Term Stability ◽  
Metal Borides ◽  
Current Densities ◽  
Alkaline Membrane ◽  
Co Reduction

AbstractMetal borides/borates have been considered promising as oxygen evolution reaction catalysts; however, to date, there is a dearth of evidence of long-term stability at practical current densities. Here we report a phase composition modulation approach to fabricate effective borides/borates-based catalysts. We find that metal borides in-situ formed metal borates are responsible for their high activity. This knowledge prompts us to synthesize NiFe-Boride, and to use it as a templating precursor to form an active NiFe-Borate catalyst. This boride-derived oxide catalyzes oxygen evolution with an overpotential of 167 mV at 10 mA/cm2 in 1 M KOH electrolyte and requires a record-low overpotential of 460 mV to maintain water splitting performance for over 400 h at current density of 1 A/cm2. We couple the catalyst with CO reduction in an alkaline membrane electrode assembly electrolyser, reporting stable C2H4 electrosynthesis at current density 200 mA/cm2 for over 80 h.

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