当前位置：
X-MOL 学术
›
ACS Appl. Mater. Interfaces
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
NiFe2O4 Nanoparticles/NiFe Layered Double-Hydroxide Nanosheet Heterostructure Array for Efficient Overall Water Splitting at Large Current Densities
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-16 00:00:00 , DOI: 10.1021/acsami.8b07835 Zhengcui Wu 1 , Zexian Zou 1 , Jiansong Huang 1 , Feng Gao 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-16 00:00:00 , DOI: 10.1021/acsami.8b07835 Zhengcui Wu 1 , Zexian Zou 1 , Jiansong Huang 1 , Feng Gao 1
Affiliation
|
Constructing catalysts with new and optimizational chemical components and structures, which can operate well for both the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER) at large current densities, is of primary importance in practical water splitting technology. Herein, the NiFe2O4 nanoparticles/NiFe layered double hydroxide (LDH) nanosheet heterostructure array on Ni foam was prepared via a simple one-step solvothermal approach. The as-prepared heterostructure array displays high catalytic activity toward the OER with a small overpotential of 213 mV at 100 mA cm–2 and can afford a current density of 500 mA cm–2 at an overpotential of 242 mV and 1000 mA cm–2 at 265 mV. Moreover, it also presents outstanding HER activity, only needing a small overpotential of 101 mV at 10 mA cm–2, and can drive large current densities of 500 and 750 mA cm–2 at individual overpotentials of 297 and 314 mV. A two-electrode electrolyzer using NiFe2O4 nanoparticles/NiFe LDH nanosheets as both the anode and the cathode implements active overall water splitting, demanding a low voltage of 1.535 V to drive 10 mA cm–2, and can deliver 500 mA cm–2 at 1.932 V. The NiFe2O4 nanoparticles/NiFe LDH nanosheet array electrodes also show excellent stability against OER, HER, and overall water splitting at large current densities. Significantly, the overall water splitting with NiFe2O4 nanoparticles/NiFe LDH nanosheets as both the anode and the cathode can be continuously driven by a battery of only 1.5 V. The intrinsic advantages and strong coupling effects of NiFe2O4 nanoparticles and NiFe LDH nanosheets make NiFe2O4 nanoparticles/NiFe LDH nanosheet heterostructure array abundant catalytically active sites, high electronic conductivity, and high catalytic reactivity, which remarkably contributed to the catalytic activities for OER, HER, and overall water splitting. Our work can inspire the optimal design of the NiFe bimetallic heterostructure electrocatalyst for application in practical water electrolysis.
中文翻译：
NiFe 2 O 4纳米颗粒/ NiFe层状双氢氧化物纳米片异质结构阵列，可在大电流密度下有效地进行总水分解
在实际的水分解技术中，构建具有新型和最佳化学成分和结构的催化剂，使其在大电流密度下都能很好地用于阳极氧逸出反应（OER）和阴极氢逸出反应（HER）。在此，通过简单的一步溶剂热法制备了Ni泡沫上的NiFe 2 O 4纳米颗粒/ NiFe层状双氢氧化物（LDH）纳米片异质结构阵列。制备的异质结构阵列对OER表现出高催化活性，在100 mA cm –2时有213 mV的小过电位，在242 mV和1000 mA cm –2的过电位下可以提供500 mA cm –2的电流密度在265 mV下。此外，它还具有出色的HER活性，在10 mA cm –2时只需要101 mV的小过电位，并且在297和314 mV的单个过电位下可以驱动500和750 mA cm –2的大电流密度。使用NiFe 2 O 4纳米颗粒/ NiFe LDH纳米片作为阳极和阴极的两电极电解器实现了有效的总水分解，需要1.535 V的低电压来驱动10 mA cm –2，并且可以提供500 mA cm – 2在1.932 V下。NiFe 2 O 4纳米粒子/ NiFe LDH纳米片阵列电极在大电流密度下还具有出色的抗OER，HER和整体水分解的稳定性。显著，镍铁的总的水分解2个ö 4纳米颗粒/ LDH由NiFe纳米片作为阳极和阴极都可以连续地通过仅仅1.5伏的电池驱动的固有的优点和NiFe构成强耦合效应2 ö 4个纳米颗粒和镍铁LDH纳米片制造NiFe 2 O 4纳米颗粒/ NiFe LDH纳米片异质结构阵列具有丰富的催化活性位，高电子电导率和高催化反应活性，这显着促进了OER，HER和总水分解的催化活性。我们的工作可以启发NiFe双金属异质结构电催化剂在实际水电解中的最佳设计。
更新日期：2018-07-16
中文翻译：
NiFe 2 O 4纳米颗粒/ NiFe层状双氢氧化物纳米片异质结构阵列，可在大电流密度下有效地进行总水分解
在实际的水分解技术中，构建具有新型和最佳化学成分和结构的催化剂，使其在大电流密度下都能很好地用于阳极氧逸出反应（OER）和阴极氢逸出反应（HER）。在此，通过简单的一步溶剂热法制备了Ni泡沫上的NiFe 2 O 4纳米颗粒/ NiFe层状双氢氧化物（LDH）纳米片异质结构阵列。制备的异质结构阵列对OER表现出高催化活性，在100 mA cm –2时有213 mV的小过电位，在242 mV和1000 mA cm –2的过电位下可以提供500 mA cm –2的电流密度在265 mV下。此外，它还具有出色的HER活性，在10 mA cm –2时只需要101 mV的小过电位，并且在297和314 mV的单个过电位下可以驱动500和750 mA cm –2的大电流密度。使用NiFe 2 O 4纳米颗粒/ NiFe LDH纳米片作为阳极和阴极的两电极电解器实现了有效的总水分解，需要1.535 V的低电压来驱动10 mA cm –2，并且可以提供500 mA cm – 2在1.932 V下。NiFe 2 O 4纳米粒子/ NiFe LDH纳米片阵列电极在大电流密度下还具有出色的抗OER，HER和整体水分解的稳定性。显著，镍铁的总的水分解2个ö 4纳米颗粒/ LDH由NiFe纳米片作为阳极和阴极都可以连续地通过仅仅1.5伏的电池驱动的固有的优点和NiFe构成强耦合效应2 ö 4个纳米颗粒和镍铁LDH纳米片制造NiFe 2 O 4纳米颗粒/ NiFe LDH纳米片异质结构阵列具有丰富的催化活性位，高电子电导率和高催化反应活性，这显着促进了OER，HER和总水分解的催化活性。我们的工作可以启发NiFe双金属异质结构电催化剂在实际水电解中的最佳设计。
京公网安备 11010802027423号