A cobalt-borate nanosheet array: an efficient and durable non-noble-metal electrocatalyst for water oxidation at near neutral pH

2017 ◽  
Vol 5 (16) ◽  
pp. 7305-7308 ◽  
Author(s):  
Libin Yang ◽  
Danni Liu ◽  
Shuai Hao ◽  
Rongmei Kong ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
High Activity ◽  
Noble Metal ◽  
Current Density ◽  
Water Oxidation ◽  
Catalytic Current ◽  
Neutral Ph ◽  
Nanosheet Array ◽  
Ti Mesh ◽  
Catalyst Electrode

As a durable catalyst electrode, a cobalt-borate nanosheet array on a Ti mesh shows high activity for water oxidation in 0.1 M K-Bi (pH: 9.2), achieving a geometrical catalytic current density of 10 mA cm−2 at an overpotential of 469 mV.

Cobalt–borate nanowire array as a high-performance catalyst for oxygen evolution reaction in near-neutral media

2017 ◽  
Vol 5 (16) ◽  
pp. 7291-7294 ◽  
Author(s):  
Xiang Ren ◽  
Ruixiang Ge ◽  
Yong Zhang ◽  
Danni Liu ◽  
Dan Wu ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
High Performance ◽  
Nanowire Array ◽  
Catalytic Current ◽  
Neutral Media ◽  
Ti Mesh

As a durable catalyst, cobalt–borate nanowire array on Ti mesh exhibits high activity for water oxidation in near-neutral media, thereby achieving a geometrical catalytic current density of 10 mA cm−2 at an overpotential of 420 mV.

A nickel-borate nanoarray: a highly active 3D oxygen-evolving catalyst electrode operating in near-neutral water

2017 ◽  
Vol 53 (21) ◽  
pp. 3070-3073 ◽  
Author(s):  
Xuqiang Ji ◽  
Liang Cui ◽  
Danni Liu ◽  
Shuai Hao ◽  
Jingquan Liu ◽  
...  
Keyword(s):  
High Activity ◽  
Current Density ◽  
Water Oxidation ◽  
Carbon Cloth ◽  
Highly Active ◽  
Neutral Water ◽  
Oxygen Evolving ◽  
Electrolyte Ph ◽  
A Current ◽  
Catalyst Electrode

A nickel-borate nanoarray on carbon cloth (Ni-Bi/CC) derived from NiO/CC shows high activity and durability for water oxidation electrocatalysis in a borate electrolyte (pH 9.2), offering a current density of 10 mA cm−2 at an overpotential of 470 mV.

A Zn-doped Ni3S2nanosheet array as a high-performance electrochemical water oxidation catalyst in alkaline solution

2017 ◽  
Vol 53 (92) ◽  
pp. 12446-12449 ◽  
Author(s):  
Qin Liu ◽  
Lisi Xie ◽  
Zhiang Liu ◽  
Gu Du ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Alkaline Solution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
High Performance ◽  
Oxidation Catalyst ◽  
Ni Foam ◽  
Catalytic Current ◽  
Nanosheet Array

A Zn-doped Ni3S2nanosheet array on Ni foam (Zn-Ni3S2/NF) acts as a high-performance and durable electrocatalyst for the oxygen evolution reaction in 1.0 M KOH, driving a catalytic current density of 100 mA cm−2at an overpotential of 330 mV, 90 mV less than that for Ni3S2/NF.

scholarly journals Coordination modulation of iridium single-atom catalyst maximizing water oxidation activity

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Zhanwu Lei ◽  
Wenbin Cai ◽  
Yifei Rao ◽  
Kuan Wang ◽  
Yuyuan Jiang ◽  
...  
Keyword(s):  
High Activity ◽  
Current Density ◽  
Water Oxidation ◽  
Distribution Density ◽  
High Surface ◽  
Single Atom ◽  
Surface Distribution ◽  
Oxidation Activity ◽  
Nanosheet Arrays ◽  
A Current

AbstractSingle-atom catalysts (SACs) have attracted tremendous research interests in various energy-related fields because of their high activity, selectivity and 100% atom utilization. However, it is still a challenge to enhance the intrinsic and specific activity of SACs. Herein, we present an approach to fabricate a high surface distribution density of iridium (Ir) SAC on nickel-iron sulfide nanosheet arrays substrate (Ir1/NFS), which delivers a high water oxidation activity. The Ir1/NFS catalyst offers a low overpotential of ~170 mV at a current density of 10 mA cm−2 and a high turnover frequency of 9.85 s−1 at an overpotential of 300 mV in 1.0 M KOH solution. At the same time, the Ir1/NFS catalyst exhibits a high stability performance, reaching a lifespan up to 350 hours at a current density of 100 mA cm−2. First-principles calculations reveal that the electronic structures of Ir atoms are significantly regulated by the sulfide substrate, endowing an energetically favorable reaction pathway. This work represents a promising strategy to fabricate high surface distribution density single-atom catalysts with high activity and durability for electrochemical water splitting.

Ultra-thin wrinkled NiOOH–NiCr2O4 nanosheets on Ni foam: an advanced catalytic electrode for oxygen evolution reaction

2018 ◽  
Vol 54 (39) ◽  
pp. 4987-4990 ◽  
Author(s):  
Jinxiu Zhao ◽  
Xiang Ren ◽  
Qingzhi Han ◽  
Dawei Fan ◽  
Xu Sun ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Alkaline Media ◽  
Ni Foam ◽  
Catalytic Current

NiOOH–NiCr2O4/NF shows high activity for the OER in alkaline media, achieving a catalytic current density of 20 mA cm−2 at an overpotential of 271 mV.

Ternary NiCoP nanosheet array on a Ti mesh: a high-performance electrochemical sensor for glucose detection

2016 ◽  
Vol 52 (100) ◽  
pp. 14438-14441 ◽  
Author(s):  
Zao Wang ◽  
Xiaoqin Cao ◽  
Danni Liu ◽  
Shuai Hao ◽  
Gu Du ◽  
...  
Keyword(s):  
High Performance ◽  
Glucose Sensor ◽  
Active Catalyst ◽  
High Sensitivity ◽  
Alkaline Media ◽  
Glucose Detection ◽  
Nanosheet Array ◽  
Electro Oxidation ◽  
Ti Mesh ◽  
Catalyst Electrode

NiCoP nanosheet array acts as a high-active catalyst electrode for glucose electro-oxidation in alkaline media. As a non-enzyme electrochemical glucose sensor, it shows a low detection limit of 0.13 μM (S/N = 3) and a high sensitivity of 14 586 μA mM−1 cm−2.

scholarly journals Modelling the (Essential) Role of Proton Transport by Electrolyte Bases for Electrochemical Water Oxidation at Near-Neutral pH

Inorganics ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 20 ◽  
Author(s):  
Holger Dau ◽  
Chiara Pasquini
Keyword(s):  
Water Oxidation ◽  
Proton Transport ◽  
Fossil Fuels ◽  
Ph Dependence ◽  
Effective Diffusion ◽  
Diffusion Constant ◽  
Co2 Reduction ◽  
Catalytic Current ◽  
Near Surface ◽  
Neutral Ph

The oxygen-evolution reaction (OER) in the near-neutral pH-regime is of high interest, e.g., for coupling of OER and CO2-reduction in the production of non-fossil fuels. A simple model is proposed that assumes equal proton activities in the catalyst film and the near-surface electrolyte. Equations are derived that describe the limitations relating to proton transport mediated by fluxes of molecular “buffer bases” in the electrolyte. The model explains (1) the need for buffer bases in near-neutral OER and (2) the pH dependence of the catalytic current at high overpotentials. The latter is determined by the concentration of unprotonated buffer bases times an effective diffusion constant, which can be estimated for simple cell geometries from tabulated diffusion coefficients. The model predicts (3) a macroscopic region of increased pH close to the OER electrode and at intermediate overpotentials, (4) a Tafel slope that depends on the reciprocal buffer capacity; both predictions are awaiting experimental verification. The suggested first-order model captures and predicts major trends of OER in the near-neutral pH, without accounting for proton-transport limitations at the catalyst–electrolyte interface and within the catalyst material, but the full quantitative agreement may require refinements. The suggested model also may be applicable to further electrocatalytic processes.

A Co-MOF nanosheet array as a high-performance electrocatalyst for the oxygen evolution reaction in alkaline electrolytes

2018 ◽  
Vol 5 (2) ◽  
pp. 344-347 ◽  
Author(s):  
Xiaoping Zhang ◽  
Weidi Sun ◽  
Huitong Du ◽  
Rong-Mei Kong ◽  
Fengli Qu
Keyword(s):  
Oxygen Evolution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Ni Foam ◽  
Catalytic Current ◽  
Nanosheet Array ◽  
Alkaline Electrolytes

A Co-MOF nanosheet array on Ni foam (Co-MOF/NF) acts as a superior electrocatalyst for the oxygen evolution reaction, needing an overpotential of only 311 mV to drive a geometrical catalytic current density of 50 mA cm−2 in 1.0 M KOH.

Calcium containing iron oxide as an efficient and robust catalyst in (photo-)electrocatalytic water oxidation at neutral pH

2018 ◽  
Vol 2 (1) ◽  
pp. 271-279 ◽  
Author(s):  
Hung-Chun Chiu ◽  
Wei-Hsiang Huang ◽  
Liang-Ching Hsu ◽  
Yan-Gu Lin ◽  
Yi-Hsuan Lai ◽  
...  
Keyword(s):  
Iron Oxide ◽  
High Activity ◽  
Water Oxidation ◽  
Iron Phosphate ◽  
Neutral Ph ◽  
Amorphous Nature

The amorphous nature and in situ formation of iron phosphate render CaFeOx with high activity and stability for the OER at neutral pH.

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