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Amorphous Cobalt–Iron Hydroxide Nanosheet Electrocatalyst for Efficient Electrochemical and Photo‐Electrochemical Oxygen Evolution

Finding efficient electrocatalysts for oxygen evolution reaction (OER) that can be effectively integrated with semiconductors is significantly challenging for solar‐driven photo‐electrochemical (PEC) water splitting. Herein, amorphous cobalt–iron hydroxide (CoFeH) nanosheets are synthesized by faci... Full description

Journal Title: Advanced Functional Materials April 2017, Vol.27(14), pp.n/a-n/a
Main Author: Liu, Wei
Other Authors: Liu, Hu , Dang, Lianna , Zhang, Hongxiu , Wu, Xiaolin , Yang, Bin , Li, Zhongjian , Zhang, Xingwang , Lei, Lecheng , Jin, Song
Format: Electronic Article Electronic Article
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ID: ISSN: 1616-301X ; E-ISSN: 1616-3028 ; DOI: 10.1002/adfm.201603904
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recordid: wj10.1002/adfm.201603904
title: Amorphous Cobalt–Iron Hydroxide Nanosheet Electrocatalyst for Efficient Electrochemical and Photo‐Electrochemical Oxygen Evolution
format: Article
creator:
  • Liu, Wei
  • Liu, Hu
  • Dang, Lianna
  • Zhang, Hongxiu
  • Wu, Xiaolin
  • Yang, Bin
  • Li, Zhongjian
  • Zhang, Xingwang
  • Lei, Lecheng
  • Jin, Song
subjects:
  • Amorphous Cobalt–Iron Hydroxide
  • Oxygen Evolution Reaction
  • Photo‐Electrochemical Water Splitting
ispartof: Advanced Functional Materials, April 2017, Vol.27(14), pp.n/a-n/a
description: Finding efficient electrocatalysts for oxygen evolution reaction (OER) that can be effectively integrated with semiconductors is significantly challenging for solar‐driven photo‐electrochemical (PEC) water splitting. Herein, amorphous cobalt–iron hydroxide (CoFeH) nanosheets are synthesized by facile electrodeposition as an efficient catalyst for both electrochemical and PEC water oxidation. As a result of the high electrochemically active surface area and the amorphous nature, the optimized amorphous CoFeH nanosheets exhibit superior OER catalytic activity in alkaline environment with a small overpotential (280 mV) to achieve significant oxygen evolution ( = 10 mA cm) and a low Tafel slope (28 mV dec). Furthermore, CoFeH nanosheets are simply integrated with BiVO semiconductor to construct CoFeH/BiVO photoanodes that exhibit a significantly enhanced photocurrent density of 2.48 mA cm (at 1.23 V vs reversible hydrogen electrode (RHE)) and a much lower onset potential of 0.23 V (vs RHE) for PEC‐OER. Careful electrochemical and optical studies reveal that the improved OER kinetics and high‐quality interface at the CoFeH/BiVO junction, as well as the excellent optical transparency of CoFeH nanosheets, contribute to the high PEC performance. This study establishes amorphous CoFeH nanosheets as a highly competitive candidate for electrochemical and PEC water oxidation and provides general guidelines for designing efficient PEC systems. are effectively integrated, constructing a catalyst/BiVO structure for achieving efficient photo‐electrochemical (PEC) water oxidation. Benefiting from the properties of CoFeH and the rational design of electrocatalyst/semiconductor architecture, CoFeH/BiVO photoanodes exhibit an enhanced photocurrent density and a low onset potential for PEC water oxidation.
language:
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identifier: ISSN: 1616-301X ; E-ISSN: 1616-3028 ; DOI: 10.1002/adfm.201603904
fulltext: fulltext
issn:
  • 1616-301X
  • 1616301X
  • 1616-3028
  • 16163028
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titleAmorphous Cobalt–Iron Hydroxide Nanosheet Electrocatalyst for Efficient Electrochemical and Photo‐Electrochemical Oxygen Evolution
creatorLiu, Wei ; Liu, Hu ; Dang, Lianna ; Zhang, Hongxiu ; Wu, Xiaolin ; Yang, Bin ; Li, Zhongjian ; Zhang, Xingwang ; Lei, Lecheng ; Jin, Song
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subjectAmorphous Cobalt–Iron Hydroxide ; Oxygen Evolution Reaction ; Photo‐Electrochemical Water Splitting
descriptionFinding efficient electrocatalysts for oxygen evolution reaction (OER) that can be effectively integrated with semiconductors is significantly challenging for solar‐driven photo‐electrochemical (PEC) water splitting. Herein, amorphous cobalt–iron hydroxide (CoFeH) nanosheets are synthesized by facile electrodeposition as an efficient catalyst for both electrochemical and PEC water oxidation. As a result of the high electrochemically active surface area and the amorphous nature, the optimized amorphous CoFeH nanosheets exhibit superior OER catalytic activity in alkaline environment with a small overpotential (280 mV) to achieve significant oxygen evolution ( = 10 mA cm) and a low Tafel slope (28 mV dec). Furthermore, CoFeH nanosheets are simply integrated with BiVO semiconductor to construct CoFeH/BiVO photoanodes that exhibit a significantly enhanced photocurrent density of 2.48 mA cm (at 1.23 V vs reversible hydrogen electrode (RHE)) and a much lower onset potential of 0.23 V (vs RHE) for PEC‐OER. Careful electrochemical and optical studies reveal that the improved OER kinetics and high‐quality interface at the CoFeH/BiVO junction, as well as the excellent optical transparency of CoFeH nanosheets, contribute to the high PEC performance. This study establishes amorphous CoFeH nanosheets as a highly competitive candidate for electrochemical and PEC water oxidation and provides general guidelines for designing efficient PEC systems. are effectively integrated, constructing a catalyst/BiVO structure for achieving efficient photo‐electrochemical (PEC) water oxidation. Benefiting from the properties of CoFeH and the rational design of electrocatalyst/semiconductor architecture, CoFeH/BiVO photoanodes exhibit an enhanced photocurrent density and a low onset potential for PEC water oxidation.
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titleAmorphous Cobalt–Iron Hydroxide Nanosheet Electrocatalyst for Efficient Electrochemical and Photo‐Electrochemical Oxygen Evolution
descriptionFinding efficient electrocatalysts for oxygen evolution reaction (OER) that can be effectively integrated with semiconductors is significantly challenging for solar‐driven photo‐electrochemical (PEC) water splitting. Herein, amorphous cobalt–iron hydroxide (CoFeH) nanosheets are synthesized by facile electrodeposition as an efficient catalyst for both electrochemical and PEC water oxidation. As a result of the high electrochemically active surface area and the amorphous nature, the optimized amorphous CoFeH nanosheets exhibit superior OER catalytic activity in alkaline environment with a small overpotential (280 mV) to achieve significant oxygen evolution ( = 10 mA cm) and a low Tafel slope (28 mV dec). Furthermore, CoFeH nanosheets are simply integrated with BiVO semiconductor to construct CoFeH/BiVO photoanodes that exhibit a significantly enhanced photocurrent density of 2.48 mA cm (at 1.23 V vs reversible hydrogen electrode (RHE)) and a much lower onset potential of 0.23 V (vs RHE) for PEC‐OER. Careful electrochemical and optical studies reveal that the improved OER kinetics and high‐quality interface at the CoFeH/BiVO junction, as well as the excellent optical transparency of CoFeH nanosheets, contribute to the high PEC performance. This study establishes amorphous CoFeH nanosheets as a highly competitive candidate for electrochemical and PEC water oxidation and provides general guidelines for designing efficient PEC systems. are effectively integrated, constructing a catalyst/BiVO structure for achieving efficient photo‐electrochemical (PEC) water oxidation. Benefiting from the properties of CoFeH and the rational design of electrocatalyst/semiconductor architecture, CoFeH/BiVO photoanodes exhibit an enhanced photocurrent density and a low onset potential for PEC water oxidation.
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titleAmorphous Cobalt–Iron Hydroxide Nanosheet Electrocatalyst for Efficient Electrochemical and Photo‐Electrochemical Oxygen Evolution
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abstractFinding efficient electrocatalysts for oxygen evolution reaction (OER) that can be effectively integrated with semiconductors is significantly challenging for solar‐driven photo‐electrochemical (PEC) water splitting. Herein, amorphous cobalt–iron hydroxide (CoFeH) nanosheets are synthesized by facile electrodeposition as an efficient catalyst for both electrochemical and PEC water oxidation. As a result of the high electrochemically active surface area and the amorphous nature, the optimized amorphous CoFeH nanosheets exhibit superior OER catalytic activity in alkaline environment with a small overpotential (280 mV) to achieve significant oxygen evolution ( = 10 mA cm) and a low Tafel slope (28 mV dec). Furthermore, CoFeH nanosheets are simply integrated with BiVO semiconductor to construct CoFeH/BiVO photoanodes that exhibit a significantly enhanced photocurrent density of 2.48 mA cm (at 1.23 V vs reversible hydrogen electrode (RHE)) and a much lower onset potential of 0.23 V (vs RHE) for PEC‐OER. Careful electrochemical and optical studies reveal that the improved OER kinetics and high‐quality interface at the CoFeH/BiVO junction, as well as the excellent optical transparency of CoFeH nanosheets, contribute to the high PEC performance. This study establishes amorphous CoFeH nanosheets as a highly competitive candidate for electrochemical and PEC water oxidation and provides general guidelines for designing efficient PEC systems. are effectively integrated, constructing a catalyst/BiVO structure for achieving efficient photo‐electrochemical (PEC) water oxidation. Benefiting from the properties of CoFeH and the rational design of electrocatalyst/semiconductor architecture, CoFeH/BiVO photoanodes exhibit an enhanced photocurrent density and a low onset potential for PEC water oxidation.
doi10.1002/adfm.201603904
pages1-10
date2017-04