自支撑NiFe LDHs@Co-OH-CO3纳米棒阵列电极用于碱性阴离子交换膜电解水

doi:10.13208/j.electrochem.2214003

摘要/Abstract

摘要：

开发高效耐用的电极对碱性阴离子交换膜电解水（AEMWEs）制氢至关重要。在这项研究中,我们展示了一种高效且稳定的自支撑NiFe LDHs@Co-OH-CO₃/NF纳米棒阵列电极分别用于析氧反应（OER）和AEMWE的阳极。在这项工作中,我们将2D的镍铁层状双金属氢氧化物纳米片（NiFe LDHs）原位生长在1D的碱式碳酸钴纳米线上（Co-OH-CO₃/NF）,最终得到独特的纳米棒阵列复合结构电极。在三电极体系中,自支撑NiFe LDHs@Co-OH-CO₃/NF对OER具有良好的催化活性, 在1 mol·L^-1 KOH中, 当电流密度为20 mA·cm^-2时,过电位为215 mV。当自支撑NiFe LDHs@Co-OH-CO₃/NF作为AEMWE的阳极（70 ^oC,1 mol·L^-1 KOH）,在电流密度为0.5 A·cm^-2时, 电解电压为1.72 V,并且具有较好的稳定性。进一步的实验表征结果显示了自支撑NiFe LDHs@Co-OH-CO₃/NF的优异性能是其具有特殊的形貌结构。这是由于纳米棒阵列电极的三维分层结构可以有效防止纳米片团聚, 从而有利于电子转移,为水分解提供大量的边缘活性位点。

关键词: 镍铁层状双金属氢氧化物, 析氧反应, 碱性阴离子交换膜电解

Abstract:

The development of efficient and durable electrodes for anion exchange membrane water electrolyzers (AEMWEs) is essential for hydrogen production. In this work, 2D NiFe layered double hydroxides (NiFe LDHs) nanosheets were grown on the 1D cobaltous carbonate hydroxide nanowires array (Co-OH-CO₃) and the unique 3D layered self-supporting nanorod array (NiFe LDHs@Co-OH-CO₃/NF) electrode was obtained. Importantly, we demonstrated an efficient and durable self-supporting NiFe LDHs@Co-OH-CO₃/NF electrode for oxygen evolution reaction (OER) and as the anode of the AEMWE. In a three-electrode system, the self-supporting NiFe LDHs@Co-OH-CO₃/NF electrode showed excellent catalytic activity for OER, with an overpotential of 215 mV at a current density of 20 mA·cm^-2 in 1 mol·L^-1 KOH, and the promising AEMWE performance upon using as the anode, with a current density of 0.5 A·cm^-2 at 1.72 V in 1 mol·L^-1 KOH at 70 ^oC. The experimental results further revealed the outstanding performance of the electrode with the special morphological structure. The 3D layered structure of nanorod array electrode could effectively prevent the agglomeration of nanosheets, which is conducive to electron transfer and provides a large number of edge active sites for water electrolyzer.

Key words: NiFe layered double hydroxides, oxygen evolution reaction, anion exchange membrane water electrolyzer

郭丹丹, 俞红梅, 迟军, 邵志刚. 自支撑NiFe LDHs@Co-OH-CO₃纳米棒阵列电极用于碱性阴离子交换膜电解水[J]. 电化学（中英文）, 2022, 28(9): 2214003.

Dan-Dan Guo, Hong-Mei Yu, Jun Chi, Zhi-Gang Shao. Self-Supporting NiFe LDHs@Co-OH-CO₃ Nanorod Array Electrode for Alkaline Anion Exchange Membrane Water Electrolyzer[J]. Journal of Electrochemistry, 2022, 28(9): 2214003.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.2214003

https://electrochem.xmu.edu.cn/CN/Y2022/V28/I9/2214003

图/表 11

参考文献 65

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Electrocatalyst	Substrate	η for OER at corresponding j (mV@mA cm^-2)	Tafel slope (mV·dec^-1)	Stability test	Reference
Fe: Ni/Ni₂P IO	nickel foam	285@20 (iR-compensated)	48	20 mA·cm^-2 for 100 h	[53]
Ni-Fe LDH DSNCS	glassy carbon electrode	246@20 (iR-compensated)	71	20 mA·cm^-2 for 50 h	[42]
FeOOH/Co/FeOOH HNTAs-NF	nickel foam	250@20 (iR-compensated)	-	20 mA·cm^-2 for 50 h	[54]
NiS₂/NiSe₂	glassy carbon electrode	290@20 (iR-compensated)	119	100 mA·cm^-2 for 20 h	[55]
Cu@CeO₂@NFC-0.25	copper foam	231@10 (without iR compensated)	32.7	10 and 20 mA·cm^-2 for 30 h	[56]
NiFe-OH-PO₄/NF	nickel foam	249@20 ( iR compensated)	41.8	100 mA·cm^-2 for 10h	[57]
CoP@NiFe-OH	nickel foam	220@20 (iR-compensated)	49.6	20 mA·cm^-2 for 24 h	[28]
CoO@NiFe LDH/NF	nickel foam	225@20 (without iR-compensated)	65	20 mA·cm^-2 for 80 h	[44]
Ni_0.9Fe_0.1PS₃ NSs	glassy carbon electrode	329@20 (iR-compensated)	69	30 mA·cm^-2 for 50 h	[58]
NiFe LDHs@Co-OH- CO₃/NF	nickel foam	215@20 (without iR compensated)	90	20 mA·cm^-2 for 30 h	this work

(anode\|\|cathode)	Cell voltage V@ A·cm^-2	Cell temperature (^oC)	Stability test (hours @A·cm^-2)	Reference
NiFeCo LDH\|\|NiFeCo phosphide	1.75@0.5	50	40 @0.5	[34]
FeOOH/NiFe LDHs@CCH NAs-NF\|\|70 wt% Pt/C	1.768@0.5	70	100 @0.5	[31]
(0.4 mg·cm^-2)
Co(OH)_x/Ag/Co(OH)₂\|\|40 wt% Pt/C ( not mention)	1.8@0.6	50	24 @0.6	[33]
VCoCO_x@NF \|\| VCoCO_x@NF	2.01@0.2	45	12 @0.25	[36]
CE-CCO\|\|70 wt% Pt/C (1 mg·cm^-2)	1.8@1.39	45	64 @0.5	[65]
NiFe LDHs@Co-OH-CO₃/NF\|\|70 wt% Pt/C(0.4 mg·cm^-2)	1.72@0.5	70	100 @0.5	This work
NiFe LDHs@Co-OH-CO₃/NF\|\|70 wt% Pt/C(0.4 mg·cm^-2)	1.95@1	70	-	This work

自支撑NiFe LDHs@Co-OH-CO₃纳米棒阵列电极用于碱性阴离子交换膜电解水

Self-Supporting NiFe LDHs@Co-OH-CO₃ Nanorod Array Electrode for Alkaline Anion Exchange Membrane Water Electrolyzer

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