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.

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 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.

Hierarchical CoS2/Ni3S2/CoNiOx nanorods with favorable stability at 1 A cm−2 for electrocatalytic water oxidation

2019 ◽  
Vol 55 (11) ◽  
pp. 1564-1567 ◽  
Author(s):  
Husileng Lee ◽  
Xiujuan Wu ◽  
Qilun Ye ◽  
Xingqiang Wu ◽  
Xiaoxiao Wang ◽  
...  
Keyword(s):  
Current Density ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
A Current

A hierarchical 3D CoS2/Ni3S2/CoNiOx water oxidation catalyst can maintain a current density of 1 A cm−2 for one week in 30% KOH solution with a slight increase of the overpotential.

scholarly journals Low-cost CoFe2O4/biomass carbon hybrid from metal-enriched sulfate reducing bacteria as an electrocatalyst for water oxidation

RSC Advances ◽  
2018 ◽  
Vol 8 (40) ◽  
pp. 22799-22805 ◽  
Author(s):  
Songhu Bi ◽  
Jingde Li ◽  
Qin Zhong ◽  
Chuntan Chen ◽  
Qiyi Zhang ◽  
...  
Keyword(s):  
Current Density ◽  
Water Oxidation ◽  
Low Cost ◽  
Sulfate Reducing Bacteria ◽  
Biomass Carbon ◽  
Tafel Slope ◽  
Sulfate Reducing ◽  
Reducing Bacteria ◽  
A Current

A low-cost CoFe2O4/biomass carbon (CFO@BC/Zn) hybrid from Co-enriched Sulfate Reducing Bacteria (Co-SRB) as an electrocatalyst for OER. The electrocatalyst exhibits a low potential of 1.53 V at a current density 10 mA cm−2 and Tafel slope of 86 mV dec−1.

Construction of a hierarchical NiFe layered double hydroxide with a 3D mesoporous structure as an advanced electrocatalyst for water oxidation

2018 ◽  
Vol 5 (8) ◽  
pp. 1795-1799 ◽  
Author(s):  
Jiahao Yu ◽  
Fulin Yang ◽  
Gongzhen Cheng ◽  
Wei Luo
Keyword(s):  
Hydrothermal Method ◽  
Layered Double Hydroxide ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Cost Effective ◽  
Mesoporous Structure ◽  
One Step ◽  
Double Hydroxide ◽  
A Current

A facile and cost-effective one-step hydrothermal method is used to synthesize NiFe LDH microclusters with a 3D hierarchically mesoporous architecture. This superior electrocatalyst can achieve a current density of 10 mA cm−2 with an ultralow overpotential of 211 mV toward the oxygen evolution reaction.

A transition metal oxofluoride offering advantages in electrocatalysis and potential use in applications

2016 ◽  
Vol 188 ◽  
pp. 481-498 ◽  
Author(s):  
H. Svengren ◽  
N. Torapava ◽  
I. Athanassiadis ◽  
S. I. Ali ◽  
M. Johnsson
Keyword(s):  
Current Density ◽  
Water Oxidation ◽  
Hydrophobic Surface ◽  
Surface Sites ◽  
Faradaic Current ◽  
Crystallite Surface ◽  
Potential Use ◽  
A Current ◽  
Shape And Size

The recently described solid solution (Co,Ni,Mn)3Sb4O6F6has proved stable and efficient as a catalyst for electrocatalytic water oxidation. The end component Co3Sb4O6F6was found to be most efficient, maintaining a current density ofj= 10 mA cm−2at an overpotential of 443 mV with good capability. At this current density, O2and H2were produced in the ratio 1 : 2 without loss of faradaic current against a Pt-cathode. A morphological change in the crystallite surface was observed after 0.5 h, however, even after 64.5 h, the overall shape and size of the small crystallites were unaffected and the electrolyte contained only 0.02 at% Co. It was also possible to conclude fromin situEXAFS measurements that the coordination around Co did not change. The oxofluorides express both hydrophilic and hydrophobic surface sites, incorporate a flexible metalloid element and offer the possibility of a mechanism that differs from other inorganic catalytic pathways previously described.

scholarly journals Fabrication of monodisperse nitrogen-doped carbon double-shell hollow nanoparticles for supercapacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (33) ◽  
pp. 20694-20699 ◽  
Author(s):  
Juyoung Yun ◽  
Jaemoon Jun ◽  
Jungsup Lee ◽  
Jaehoon Ryu ◽  
Kisu Lee ◽  
...  
Keyword(s):  
Current Density ◽  
Electrode Material ◽  
Nitrogen Doping ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
Hollow Nanoparticles ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
A Current

A supercapacitor based on nitrogen-doped carbon double shell hollow nanoparticles as the electrode material exhibited a high specific capacitance of 202 F g−1at a current density of 0.5 A g−1due to high surface area and nitrogen-doping.

scholarly journals Energy-saving electrolytic γ-MnO2 generation: non-noble metal electrocatalyst gas diffusion electrode as cathode in acid solution

RSC Advances ◽  
2019 ◽  
Vol 9 (43) ◽  
pp. 24816-24821
Author(s):  
Jing Tang ◽  
Hui Min Meng ◽  
Mei Yang Ji
Keyword(s):  
Acid Solution ◽  
Energy Saving ◽  
High Activity ◽  
Noble Metal ◽  
Current Density ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
A Current

Co3O4/FLG was used as a nanocatalyst to catalyze the ORR in the electrodeposition of MnO2. The proposed Co3O4/FLG nanocomposite GDE exhibited a high activity of 0.9 V at a current density of 100 A m−2.

In Situ Growth of MOF-Derived NaCoPO4@Carbon for Asymmetric Supercapacitive and Water Oxidation Electrocatalytic Performance

NANO ◽  
2019 ◽  
Vol 14 (12) ◽  
pp. 1950148 ◽  
Author(s):  
Peng Guo ◽  
Zhaojie Wang ◽  
Hongyu Chen ◽  
Shaohui Ge ◽  
Chen Chen ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Current Density ◽  
Water Oxidation ◽  
Rational Design ◽  
Electrode Materials ◽  
Metal Organic Framework ◽  
High Specific Capacitance ◽  
Potential Candidate ◽  
Practical Applications ◽  
A Current

The increasing energy crisis promotes the study on novel electrode materials with high performance for supercapacitive storage and energy conversion. Transition metal phosphates have been reported as a potential candidate due to the unique coordination and corresponding electronic structure. Herein, we adopted a facile method for preparing NaCoPO4@C derived from a metal organic framework (MOF) as a bifunctional electrode. ZIF-67 was synthesized before a refluxing process with Na2HPO4 to form a precursor, which is transformed into the final product via calcination in different atmospheres. Specifically, the resultant NaCoPO4@C exhibits a high specific capacitance of 1178.7[Formula: see text]F[Formula: see text]g[Formula: see text] at a current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text] for a supercapacitor. An asymmetric supercapacitor (ASC) assembled with active carbon displays a high capacitance of 163.7[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text]. In addition, as an oxygen evolution reaction (OER) catalyst, the NaCoPO4@C electrode requires only 299[Formula: see text]mV to drive a current density of 10[Formula: see text]mA[Formula: see text]cm[Formula: see text]. These results suggest that the rational design of MOF-derived NaCoPO4@C provides a variety of practical applications in electrochemical energy conversion and storage.

Efficient water oxidation using flower-like multiphase nickel hydroxide with Fe doping

2021 ◽  
Vol 5 (8) ◽  
pp. 2228-2233
Author(s):  
Xinyue Zhang ◽  
Yanling Qiu ◽  
Wenxiu Zhang ◽  
Xuqiang Ji ◽  
Jingquan Liu
Keyword(s):  
Current Density ◽  
Nickel Hydroxide ◽  
Water Oxidation ◽  
Fe Doping ◽  
One Pot ◽  
A Current

Catalysts of flower-like multiphase nickel hydroxide doped with Fe (Fe-α,β-Ni(OH)2) are fabricated through one-pot solvothermal-coordination methodology. The catalyst achieves a current density of 30 mA cm−2 in 1 M KOH at an overpotential of 267 mV.

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