Anion-exchange synthesis of a nanoporous crystalline CoB2O4 nanowire array for high-performance water oxidation electrocatalysis in borate solution

Nanoscale ◽  
2017 ◽  
Vol 9 (34) ◽  
pp. 12343-12347 ◽  
Author(s):  
Guilei Zhu ◽  
Lin Yang ◽  
Rong Zhang ◽  
Fengli Qu ◽  
Zhiang Liu ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Water Oxidation ◽  
High Performance ◽  
Nanowire Array ◽  
Oxidation Catalyst ◽  
Borate Solution ◽  
Catalyst Electrode

A nanoporous crystalline CoB2O4 nanowire array (CoB2O4/TM) behaves as a superior water oxidation catalyst electrode, requiring an overpotential of 446 mV to deliver 10 mA cm−2 in 0.1 M K-Bi (pH = 9.2).

A Ni3N–Co3N hybrid nanowire array electrode for high-performance nonenzymatic glucose detection

2018 ◽  
Vol 10 (15) ◽  
pp. 1680-1684 ◽  
Author(s):  
Xinglu Dai ◽  
Wenqing Deng ◽  
Chao You ◽  
Zhen Shen ◽  
Xiaoli Xiong ◽  
...  
Keyword(s):  
High Performance ◽  
Active Catalyst ◽  
Nanowire Array ◽  
Alkaline Media ◽  
Nickel Cobalt ◽  
Array Electrode ◽  
New Type ◽  
Glucose Electrooxidation ◽  
Catalyst Electrode

In this communication, we report a new type of nickel cobalt nitride hybrid nanowire array in situ grown on a Ti plate (Ni3N–Co3N NW/Ti) topotactically converted from Ni–Co hydroxide as a high-active catalyst electrode for glucose electrooxidation in alkaline media.

Vertically stacked bilayer heterostructure CoFe2O4@Ni3S2 on a 3D nickel foam as a high-performance electrocatalyst for the oxygen evolution reaction

2020 ◽  
Vol 44 (4) ◽  
pp. 1455-1462 ◽  
Author(s):  
Jingyi Wang ◽  
Zhi Yang ◽  
Meilin Zhang ◽  
Yaqiong Gong
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
High Performance ◽  
Electrochemical Reaction ◽  
Nickel Foam ◽  
Oxidation Catalyst ◽  
Reaction Conditions

The as-obtained CoFe2O4@Ni3S2/NF can serve as an active and stable water oxidation catalyst under electrochemical reaction conditions.

scholarly journals Origin of Enhanced Water Oxidation Activity in an Iridium Single Atom Catalyst

2021 ◽  
Author(s):  
Xueli Zheng ◽  
Jing Tang ◽  
Alessandro Gallo ◽  
Jose Antonio Garrido Torres ◽  
Xiaoyun Yu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
High Performance ◽  
Operating Conditions ◽  
Utilization Efficiency ◽  
Oxidation Catalyst ◽  
Single Atom ◽  
Photochemical Reduction ◽  
Oxidation Activity

<p>The efficiency of the synthesis of renewable fuels and feedstocks from electrical sources is limited at present by the sluggish water oxidation reaction. Single atom catalysts (SACs) with a controllable coordination environment and exceptional atom utilization efficiency open new paradigms towards designing high performance water oxidation catalysts. Here, using<i> operando</i> X-ray absorption spectroscopy measurements with calculations of spectra and electrochemical activity, we demonstrate that the origin of water oxidation activity of IrNiFe SACs is the presence of highly oxidized Ir single atom (Ir<sup>5.3+</sup>)<sup> </sup>in the NiFe oxyhydroxide under operating conditions. We show that the optimal water oxidation catalyst could be achieved by systematically increasing the oxidation state and modulating the coordination environments of the Ir active sites anchored atop the NiFe oxyhydroxide layers. Based on the proposed mechanism, we have successfully anchored Ir single-atom sites on NiFe oxyhydroxides (Ir<sub>0.1</sub>/Ni<sub>9</sub>Fe SAC) via a unique<i> in situ</i> cryogenic photochemical reduction (<i>in situ</i> Cryo-PCR) method which delivers an overpotential of 183 millivolts at 10 milliamperes per square centimeter and retains its performance following 20 hours of operation in 1 M KOH electrolyte, outperforming the reported catalysts and the commercial IrO<sub>2</sub> catalysts. These findings open the avenue towards atomic-level understanding of oxygen evolution of catalytic centers under <i>in operando</i> condition.</p>

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.

scholarly journals Origin of Enhanced Water Oxidation Activity in an Iridium Single Atom Catalyst

2021 ◽  
Author(s):  
Xueli Zheng ◽  
Jing Tang ◽  
Alessandro Gallo ◽  
Jose Antonio Garrido Torres ◽  
Xiaoyun Yu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
High Performance ◽  
Operating Conditions ◽  
Utilization Efficiency ◽  
Oxidation Catalyst ◽  
Single Atom ◽  
Photochemical Reduction ◽  
Oxidation Activity

<p>The efficiency of the synthesis of renewable fuels and feedstocks from electrical sources is limited at present by the sluggish water oxidation reaction. Single atom catalysts (SACs) with a controllable coordination environment and exceptional atom utilization efficiency open new paradigms towards designing high performance water oxidation catalysts. Here, using<i> operando</i> X-ray absorption spectroscopy measurements with calculations of spectra and electrochemical activity, we demonstrate that the origin of water oxidation activity of IrNiFe SACs is the presence of highly oxidized Ir single atom (Ir<sup>5.3+</sup>)<sup> </sup>in the NiFe oxyhydroxide under operating conditions. We show that the optimal water oxidation catalyst could be achieved by systematically increasing the oxidation state and modulating the coordination environments of the Ir active sites anchored atop the NiFe oxyhydroxide layers. Based on the proposed mechanism, we have successfully anchored Ir single-atom sites on NiFe oxyhydroxides (Ir<sub>0.1</sub>/Ni<sub>9</sub>Fe SAC) via a unique<i> in situ</i> cryogenic photochemical reduction (<i>in situ</i> Cryo-PCR) method which delivers an overpotential of 183 millivolts at 10 milliamperes per square centimeter and retains its performance following 20 hours of operation in 1 M KOH electrolyte, outperforming the reported catalysts and the commercial IrO<sub>2</sub> catalysts. These findings open the avenue towards atomic-level understanding of oxygen evolution of catalytic centers under <i>in operando</i> condition.</p>

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 Origin of enhanced water oxidation activity in an iridium single atom anchored on NiFe oxyhydroxide catalyst

2021 ◽  
Vol 118 (36) ◽  
pp. e2101817118
Author(s):  
Xueli Zheng ◽  
Jing Tang ◽  
Alessandro Gallo ◽  
Jose A. Garrido Torres ◽  
Xiaoyun Yu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
High Performance ◽  
Operating Conditions ◽  
Utilization Efficiency ◽  
Oxidation Catalyst ◽  
Single Atom ◽  
Photochemical Reduction ◽  
Oxidation Activity ◽  
Coordination Environment

The efficiency of the synthesis of renewable fuels and feedstocks from electrical sources is limited, at present, by the sluggish water oxidation reaction. Single-atom catalysts (SACs) with a controllable coordination environment and exceptional atom utilization efficiency open new paradigms toward designing high-performance water oxidation catalysts. Here, using operando X-ray absorption spectroscopy measurements with calculations of spectra and electrochemical activity, we demonstrate that the origin of water oxidation activity of IrNiFe SACs is the presence of highly oxidized Ir single atom (Ir5.3+) in the NiFe oxyhydroxide under operating conditions. We show that the optimal water oxidation catalyst could be achieved by systematically increasing the oxidation state and modulating the coordination environment of the Ir active sites anchored atop the NiFe oxyhydroxide layers. Based on the proposed mechanism, we have successfully anchored Ir single-atom sites on NiFe oxyhydroxides (Ir0.1/Ni9Fe SAC) via a unique in situ cryogenic–photochemical reduction method that delivers an overpotential of 183 mV at 10 mA ⋅ cm−2 and retains its performance following 100 h of operation in 1 M KOH electrolyte, outperforming the reported catalysts and the commercial IrO2 catalysts. These findings open the avenue toward an atomic-level understanding of the oxygen evolution of catalytic centers under in operando conditions.

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