Electrochemically accessing ultrathin Co (oxy)-hydroxide nanosheets and operando identifying their active phase for the oxygen evolution reaction

2019 ◽  
Vol 12 (2) ◽  
pp. 739-746 ◽  
Author(s):  
Jing Zhou ◽  
Yu Wang ◽  
Xiaozhi Su ◽  
Songqi Gu ◽  
Renduo Liu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Dft Calculations ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Phase ◽  
Chemical State ◽  
Surface Chemical ◽  
Applied Potential ◽  
Filling Process ◽  
Surface Chemical State

Operando XAS combined with DFT calculations allows us to draw a phase diagram of the surface chemical state as a function of applied potential, showing hydroxyl filling process and potential-dependent deprotonation process.

Surface chemical state evaluation of CoSe2 catalysts for the oxygen evolution reaction

2019 ◽  
Vol 55 (73) ◽  
pp. 10928-10931 ◽  
Author(s):  
Chengzhe Zhang ◽  
Bo Tang ◽  
Xiaocong Gu ◽  
Ligang Feng
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Critical Condition ◽  
Chemical State ◽  
Surface Chemical ◽  
State Evaluation ◽  
Surface Chemical State

The critical condition for efficient metallic Co–Se bonding construction and its significance for the oxygen evolution reaction were demonstrated.

scholarly journals Enhancing the activity and durability of iridium electrocatalyst supported on boron carbide by tuning the chemical state of iridium for oxygen evolution reaction

2021 ◽  
Vol 512 ◽  
pp. 230506
Author(s):  
Jahowa Islam ◽  
Sang-Kyung Kim ◽  
Phan Thanh Thien ◽  
Min-Joong Kim ◽  
Hyun-Seok Cho ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Chemical State

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.

scholarly journals Fluorescence, XPS, and TOF-SIMS Surface Chemical State Image Analysis of DNA Microarrays

2007 ◽  
Vol 129 (30) ◽  
pp. 9429-9438 ◽  
Author(s):  
Chi-Ying Lee ◽  
Gregory M. Harbers ◽  
David W. Grainger ◽  
Lara J. Gamble ◽  
David G. Castner
Keyword(s):  
Image Analysis ◽  
Dna Microarrays ◽  
Chemical State ◽  
Surface Chemical ◽  
Tof Sims ◽  
Surface Chemical State

Generalized molybdenum oxide surface chemical state XPS determination via informed amorphous sample model

2015 ◽  
Vol 326 ◽  
pp. 151-161 ◽  
Author(s):  
Jonas Baltrusaitis ◽  
Beatriz Mendoza-Sanchez ◽  
Vincent Fernandez ◽  
Rick Veenstra ◽  
Nijole Dukstiene ◽  
...  
Keyword(s):  
Molybdenum Oxide ◽  
Chemical State ◽  
Oxide Surface ◽  
Surface Chemical ◽  
Amorphous Sample ◽  
Surface Chemical State
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