Mn-Co bimetallic phosphate on electrodeposited PANI nanowires with composition modulated structural morphology for efficient electrocatalytic water splitting

Chinnadurai, Deviprasath; Rajendiran, Rajmohan; Li, Oi Lun; Prabakar, Kandasamy

doi:10.1016/j.apcatb.2021.120202

Cited by 85 publications

(37 citation statements)

References 72 publications

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“…The origin of this phenomenon depends on the number of available active sites participating in the oxidation reaction, which was calculated by integrating the area under the backward cyclic voltammetry (CV) curve (Figure 5D). 60 The number of electrochemically accessible active sites on the Cu 1.95 S surface is approximately 11 Â 10 16 , which is nearly 2 and 4.5 times higher than those on the CuS-TU (6.1 Â 10 16 ) and CuS-TAA (2.4 Â 10 16 ) surfaces, respectively. To further study the intrinsic catalytic activity, we estimated the turnover frequency (TOF) and mass activity values at different potentials, as shown in Figure 5E,F, respectively.…”

Section: Electrochemical Oer Studiesmentioning

confidence: 97%

“…Transition metal (ie, Cu, Fe, Ni, and Co) composites are the best candidates to replace the expensive electrocatalysts based on the noble metals 9‐11 . Specifically, oxides, sulfides, carbides, and phosphides of transition metals exhibit superior performance and stability in electrocatalytic (EC) HER, OER, and direct MOR, in some cases outperforming the benchmark Pt/C in HER, Ir/C in OER, and Pd‐based catalysts in MOR 11‐16 . The efficiency of EC reactions driven by transition metal composites can be further enhanced during light‐assisted experiments 17,18 .…”

Section: Introductionmentioning

confidence: 99%

“…oxides, sulfides, carbides, and phosphides of transition metals exhibit superior performance and stability in electrocatalytic (EC) HER, OER, and direct MOR, in some cases outperforming the benchmark Pt/C in HER, Ir/C in OER, and Pd-based catalysts in MOR. [11][12][13][14][15][16] The efficiency of EC reactions driven by transition metal composites can be further enhanced during light-assisted experiments. 17,18 Such photoactive materials driving HER, OER, and MOR are promising in energy conversion applications.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Begildayeva

Chinnadurai

Lee

et al. 2022

Intl J of Energy Research

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Summary Designing a highly efficient and less expensive electrocatalyst for electrolyzers and fuel cells is of great importance to creating a sustainable future energy source. Herein, we applied a unique and extremely facile pulsed laser ablation in the liquid synthesis route for the fabrication of phase‐engineered CuxSy nanospheres. The multifunctionality of these catalysts was assessed by examining the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and methanol oxidation reaction (MOR). As a result, low overpotentials of 390 mV (HER) and 440 mV (OER) were achieved for sulfur‐rich and copper‐rich samples in alkaline media, respectively. Furthermore, the high selectivity of Cu over methanol and the high number of electrochemically accessible active sites equal to 7.9 × 1016 promoted the MOR with a current density of 28.3 mA/cm2 at the vertex potential. It is worth emphasizing that in this research, we consider the electrocatalyst's initial electrocatalytic water decomposition function to gain a better understanding of the photoelectrocatalytic behavior. Using a beneficial photo‐assisted electrochemical method, a high OER catalytic activity was obtained under light irradiation due to the large light absorption coefficients of the synthesized electrocatalysts, which facilitated electron transfer at the electrode‐electrolyte interface.

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Section: Electrochemical Oer Studiesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Begildayeva

Chinnadurai

Lee

et al. 2022

Intl J of Energy Research

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“…It demonstrates that the charge transfer was much rapid at higher evolution potential as reflected in the lower charge transfer resistance and the high current density. [23,27] The OER electrocatalytic activity was further validated by the intrinsic catalytic activities evaluation done by turn over frequency (TOF). The oxygen turns over rate concerning the active center per unit time can be derived by measuring the number of active sites and normalizing the obtained current density by it.…”

Section: Chemelectrochemmentioning

confidence: 99%

Modulating the Intrinsic Electrocatalytic Activity of Copper Sulfide by Silver Doping for Electrocatalytic Overall Water Splitting

2022

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Highly efficient and cost-effective electrocatalysts towards bifunctional oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are critical for industrial scale and environmentally friendly electrocatalytic production. Herein, we attempt to synthesize a low-cost copper sulfide bifunctional electrocatalyst and modulated the intrinsic electrocatalytic activity by silver doping at desired amounts by a facile chemical bath deposition technique. The intrinsic activity of the CuS by Ag doping was closely monitored and presented with detailed OER and HER electrochemical characterizations. Finally, the optimized overall water splitting electrolyzer with a doping level of Ag 10 % exhibited a relatively low cell voltage of 1.55 V at a current density of 10 mA/cm 2 . The surface having Ag 1 + and Cu 1 + oxidation states could effectively fetch electrons from OH À species leading to higher intrinsic activity. The stability of the best electrocatalyst checked up to 40 hours at a high current rate of 200 mA/cm 2 and shows a stable oxidation state. This work provides an important Ag doping strategy for bifunctional electrocatalyst to enhance their intrinsic catalytic activity for overall water splitting application.

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“…measured by cyclic voltammetry. [25][26][27] Yet, the discussion of stability requires additional measurements to determine dissolved cations, [28,29] as well as changes in the catalyst composition, [20,30] morphology [31][32][33] and structure. [34,35] Co-based ATMO have attracted particular attention due to their high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Villalobos

Morales

Antipin

et al. 2022

Preprint

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Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effect of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing Na-containing CoOx and (Co0.7Mn0.3)Ox films electrodeposited in alkaline solution. The obtained disordered films were classified as layered oxides using X-ray absorption spectroscopy (XAS). The CoOx films showed a constant decrease in the catalytic activity during cycling, confirmed by oxygen detection, while that of (Co0.7Mn0.3)Ox slightly increased as measured by electrochemical metrics. These trends were rationalized based on XAS analysis of the metal oxidation states, which were Co2.8+ and Mn3.7+ near the surface after cycling. Thus, adding Mn to CoOx successfully stabilized the catalyst material and its activity during OER cycling. The development of stabilization approaches is essential to extend the durability of OER catalysts.

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Mn-Co bimetallic phosphate on electrodeposited PANI nanowires with composition modulated structural morphology for efficient electrocatalytic water splitting

Cited by 85 publications

References 72 publications

Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Multifunctional photo‐electrocatalysts of copper sulfides prepared via pulsed laser ablation in liquid: Phase formation kinetics and photo‐electrocatalytic activity

Modulating the Intrinsic Electrocatalytic Activity of Copper Sulfide by Silver Doping for Electrocatalytic Overall Water Splitting

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

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