scholarly journals In situ XAFS of acid-resilient iridate pyrochlore oxygen evolution electrocatalysts under operating conditions

2020 ◽  
Vol 22 (34) ◽  
pp. 18770-18773
Author(s):  
David L. Burnett ◽  
Enrico Petrucco ◽  
Andrea E. Russell ◽  
Reza J. Kashtiban ◽  
Jonathan D. B Sharman ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Operating Conditions ◽  
In Situ Xafs ◽  
Synchrotron Spectroscopy

Electrocatalytic water splitting using iridate pyrochlores studied using synchrotron spectroscopy reveals a response from all iridium in the conducting oxide.

scholarly journals In situ investigation on ultrafast oxygen evolution reactions of water splitting in proton exchange membrane electrolyzer cells

2017 ◽  
Vol 5 (35) ◽  
pp. 18469-18475 ◽  
Author(s):  
Jingke Mo ◽  
Zhenye Kang ◽  
Gaoqiang Yang ◽  
Yifan Li ◽  
Scott T. Retterer ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
The Real ◽  
Oxygen Bubble ◽  
In Situ Investigation ◽  
Bubble Evolution ◽  
Exchange Membrane

Visualization investigation the oxygen bubble evolution and dynamics reveals the real phenomena inside an operating proton exchange membrane electrolyzer cell.

Bimetallic oxyhydroxide in situ derived from Fe2Co-MOF for efficient electrocatalytic oxygen evolution

2021 ◽  
Author(s):  
Xintong Ling ◽  
Feng Du ◽  
Yintong Zhang ◽  
Yan Shen ◽  
Wa Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
In Situ Formation ◽  
Organic Framework

Metal-organic framework (MOF) has received extensive attention as a research hotspot in the field of electrocatalytic water splitting. However, the study of electrochemical in-situ formation of catalysts to improve the...

Rational composition and structural design of in situ grown nickel-based electrocatalysts for efficient water electrolysis

2016 ◽  
Vol 4 (1) ◽  
pp. 167-172 ◽  
Author(s):  
Xiangye Liu ◽  
Xin Wang ◽  
Xiaotao Yuan ◽  
Wujie Dong ◽  
Fuqiang Huang
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Structural Design ◽  
Water Electrolysis ◽  
Earth Abundant ◽  
Rational Composition

Earth-abundant and highly efficient electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are desired for water-splitting to produce hydrogen.

scholarly journals Formation of CoIV=O intermediate at the Boundary of the “Oxo-wall” Induces Water Oxidation

2020 ◽  
Author(s):  
Roman Ezhov ◽  
Alireza Ravari ◽  
Gabriel Bury ◽  
Paul Smith ◽  
Yulia Pushkar
Keyword(s):  
Hydrogen Bonding ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Bond Formation ◽  
Nucleophilic Attack ◽  
Earth Abundant ◽  
3D Elements

Abstract Development of economically viable artificial photosynthesis requires use of 3d metal-based catalysts. Water oxidation by [Co4O4]n+ cubane mimics water splitting by CaMn4O5 cluster in Nature but the exact mechanism of O-O bond formation is presently unknown. We demonstrate first in situ detection CoIV=O (~ 1.67 Å) moiety formed upon activation of [Co4O4Py4Ac4]0 (Py = pyridine and Ac = CH3COO−) towards O-O bond formation. Combined spectroscopic and DFT analyses show that the intermediate active in O-O bond formation has two CoIV centers and at least one CoIV=O unit of strong radicaloid character that participates in O-O bond formation via water nucleophilic attack. The multimetallic structure of the cubane provides unique stabilization for CoIV=O + H2O = Co-OOH + H+ transition with the carboxyl accepting the proton and the bridging oxygen stabilizing the peroxide via hydrogen bonding. Results are important for development of oxygen evolution catalysts based on Earth-abundant 3d elements.

Microkinetic model for pH- and potential-dependent oxygen evolution during water splitting on Fe-doped β-NiOOH

2020 ◽  
Vol 13 (12) ◽  
pp. 4962-4976 ◽  
Author(s):  
Ananth Govind Rajan ◽  
Emily A. Carter
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Operating Conditions ◽  
Renewable Electricity ◽  
Commercial Use ◽  
Microkinetic Model ◽  
Electrochemical Water Splitting ◽  
Reactor Operating

Understanding and predicting the effect of reactor operating conditions on electrochemical water splitting is essential to optimize sustainable hydrogen production using excess renewable electricity and to adapt it for commercial use.

NiCo2O4 nanosheet as a novel oxygen-evolution-reaction cocatalyst in-situ bonded on g-C3N4 photocatalyst for excellent overall water splitting

2021 ◽  
Author(s):  
Cheng Cheng ◽  
Liuhao Mao ◽  
Jinwen Shi ◽  
Fei Xue ◽  
Shichao Zong ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Cooperative Effect ◽  
Growth Strategy ◽  
In Situ Growth ◽  
Overall Water Splitting ◽  
Surface Bonding

2D/2D coupled NiCo2O4/g-C3N4 nanostructure was fabricated through an in-situ growth strategy. NiCo2O4 worked as a novel oxygen-evolution-reaction cocatalyst, the intimate interface combination by surface bonding and related cooperative effect between...

The in situ derivation of a NiFe-LDH ultra-thin layer on Ni-BDC nanosheets as a boosted electrocatalyst for the oxygen evolution reaction

CrystEngComm ◽  
2021 ◽  
Author(s):  
Qibing Dong ◽  
Chao Shuai ◽  
Zunli Mo ◽  
Ruibin Guo ◽  
Nijuan Liu ◽  
...  
Keyword(s):  
Thin Layer ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Splitting Process ◽  
Organic Framework

A Ni-based metal organic framework (Ni-BDC) and subsequently derived NiFe-LDH were studied to overcome the defect of the low availability of active sites for the oxygen evolution reaction (OER) during the water splitting process.

Understanding synergistic metal–oxide interactions of in situ exsolved metal nanoparticles on a pyrochlore oxide support for enhanced water splitting

2021 ◽  
Author(s):  
Myeongjin Kim ◽  
Jinho Park ◽  
Hyun Ju ◽  
Jin Young Kim ◽  
Hyun-Seok Cho ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Oxide Support ◽  
Alkaline Conditions ◽  
Pyrochlore Oxide

Structure-controlled hybrid catalysts are prepared by carefully controlling the in situ exsolution process of metallic pyrochlore oxide for efficient oxygen evolution reaction and hydrogen evolution reaction under alkaline conditions.

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