Reversible Structural Evolution of NiCoOxHy during the Oxygen Evolution Reaction and Identification of the Catalytically Active Phase

ACS Catalysis ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 1238-1247 ◽  
Author(s):  
Zhu Chen ◽  
Li Cai ◽  
Xiaofang Yang ◽  
Coleman Kronawitter ◽  
Liejin Guo ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Structural Evolution ◽  
Active Phase ◽  
Catalytically Active ◽  
Catalytically Active Phase

scholarly journals Nitrogen-Doped Sponge Ni Fibers as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaili Zhang ◽  
Xinhui Xia ◽  
Shengjue Deng ◽  
Yu Zhong ◽  
Dong Xie ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Photoelectron Spectroscopy ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
High Performance ◽  
Active Phase ◽  
X Ray ◽  
Highly Active ◽  
N Doping ◽  
Energy Conversion Devices

Abstract Controllable synthesis of highly active micro/nanostructured metal electrocatalysts for oxygen evolution reaction (OER) is a particularly significant and challenging target. Herein, we report a 3D porous sponge-like Ni material, prepared by a facile hydrothermal method and consisting of cross-linked micro/nanofibers, as an integrated binder-free OER electrocatalyst. To further enhance the electrocatalytic performance, an N-doping strategy is applied to obtain N-doped sponge Ni (N-SN) for the first time, via NH3 annealing. Due to the combination of the unique conductive sponge structure and N doping, the as-obtained N-SN material shows improved conductivity and a higher number of active sites, resulting in enhanced OER performance and excellent stability. Remarkably, N-SN exhibits a low overpotential of 365 mV at 100 mA cm−2 and an extremely small Tafel slope of 33 mV dec−1, as well as superior long-term stability, outperforming unmodified sponge Ni. Importantly, the combination of X-ray photoelectron spectroscopy and near-edge X-ray adsorption fine structure analyses shows that γ-NiOOH is the surface-active phase for OER. Therefore, the combination of conductive sponge structure and N-doping modification opens a new avenue for fabricating new types of high-performance electrodes with application in electrochemical energy conversion devices.

In situ structural evolution of a nickel boride catalyst: synergistic geometric and electronic optimization for the oxygen evolution reaction

2019 ◽  
Vol 7 (10) ◽  
pp. 5288-5294 ◽  
Author(s):  
Jihong Li ◽  
Hui Chen ◽  
Yipu Liu ◽  
Ruiqin Gao ◽  
Xiaoxin Zou
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Structural Evolution ◽  
Electronic Effects ◽  
Nickel Plate ◽  
Nickel Boride ◽  
Catalytic Stability ◽  
Activity Enhancement

A boronized nickel plate shows surface structural evolution and activity enhancement during the OER due to synergistic geometric and electronic effects, and shows good catalytic stability for over 1500 hours.

Structural Evolution of Metal (Oxy)hydroxide Nanosheets during the Oxygen Evolution Reaction

2018 ◽  
Vol 11 (6) ◽  
pp. 5590-5594 ◽  
Author(s):  
Christian Dette ◽  
Michael R. Hurst ◽  
Jiang Deng ◽  
Michael R. Nellist ◽  
Shannon W. Boettcher
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Structural Evolution

Mechanistic insight into the catalytically active phase of CO2 hydrogenation on Cu/ZnO catalyst

2020 ◽  
Vol 525 ◽  
pp. 146481 ◽  
Author(s):  
Xiao-Kuan Wu ◽  
Guang-Jie Xia ◽  
Zhen Huang ◽  
Deepak Kumar Rai ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Active Phase ◽  
Co2 Hydrogenation ◽  
Mechanistic Insight ◽  
Catalytically Active ◽  
Insight Into ◽  
Catalytically Active Phase

In-situ characterization by Near-Ambient Pressure XPS of the catalytically active phase of Pt/Al2O3 during NO and CO oxidation

2018 ◽  
Vol 220 ◽  
pp. 506-511 ◽  
Author(s):  
Susanna L. Bergman ◽  
Jonas Granestrand ◽  
Yu Tang ◽  
Rodrigo Suárez París ◽  
Marita Nilsson ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Ambient Pressure ◽  
Active Phase ◽  
In Situ Characterization ◽  
Ambient Pressure Xps ◽  
Catalytically Active ◽  
Catalytically Active Phase ◽  
Near Ambient Pressure Xps

scholarly journals Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4984
Author(s):  
Paweł Stelmachowski ◽  
Joanna Duch ◽  
David Sebastián ◽  
María Jesús Lázaro ◽  
Andrzej Kotarba
Keyword(s):  
Low Temperature ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Electrolysis ◽  
Active Phase ◽  
Alkaline Media ◽  
Research Progress ◽  
Carbon Catalysts ◽  
Temperature Water ◽  
Carbon Based

This review paper presents the most recent research progress on carbon-based composite electrocatalysts for the oxygen evolution reaction (OER), which are of interest for application in low temperature water electrolyzers for hydrogen production. The reviewed materials are primarily investigated as active and stable replacements aimed at lowering the cost of the metal electrocatalysts in liquid alkaline electrolyzers as well as potential electrocatalysts for an emerging technology like alkaline exchange membrane (AEM) electrolyzers. Low temperature electrolyzer technologies are first briefly introduced and the challenges thereof are presented. The non-carbon electrocatalysts are briefly overviewed, with an emphasis on the modes of action of different active phases. The main part of the review focuses on the role of carbon–metal compound active phase interfaces with an emphasis on the synergistic and additive effects. The procedures of carbon oxidative pretreatment and an overview of metal-free carbon catalysts for OER are presented. Then, the successful synthesis protocols of composite materials are presented with a discussion on the specific catalytic activity of carbon composites with metal hydroxides/oxyhydroxides/oxides, chalcogenides, nitrides and phosphides. Finally, a summary and outlook on carbon-based composites for low temperature water electrolysis are presented.

Unified structural motifs of the catalytically active state of Co(oxyhydr)oxides during the electrochemical oxygen evolution reaction

2018 ◽  
Vol 1 (9) ◽  
pp. 711-719 ◽  
Author(s):  
Arno Bergmann ◽  
Travis E. Jones ◽  
Elias Martinez Moreno ◽  
Detre Teschner ◽  
Petko Chernev ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active State ◽  
Structural Motifs ◽  
Catalytically Active ◽  
Electrochemical Oxygen

Promotion of oxygen evolution reaction via the reconstructed active phase of perovskite oxide

2021 ◽  
Author(s):  
Hyoi Jo ◽  
Yejin Yang ◽  
Arim Seong ◽  
Donghwi Jeong ◽  
Jeongwon Kim ◽  
...  
Keyword(s):  
Free Energy ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Electronic Structures ◽  
Active Phase ◽  
Perovskite Oxides ◽  
Perovskite Oxide ◽  
Highly Efficient ◽  
Energy Technologies

Developing a stable and highly efficient electrocatalyst for oxygen evolution reactions (OERs) is critical for renewable, safe, and emission-free energy technologies. Perovskite oxides with flexible and tunable electronic structures as...

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