O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting
Here we present a novel combined-strategy of cation tuning and surface engineering for the fabrication of highly active, earth-abundant, and robust two-dimensional Ni2P electrocatalyst. The nanosheets have lateral sizes of few hundred nm with thicknesses of ~6 nm. Our theoretical calculations sugges...
Saved in:
Main Authors: | , , , , , , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/139071 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-139071 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1390712021-01-13T05:27:46Z O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting Dinh, Khang Ngoc Sun, Xiaoli Dai, Zhengfei Zheng, Yun Zheng, Penglun Yang, Jun Xu, Jianwei Wang, Zhiguo Yan, Qingyu School of Materials Science and Engineering Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Engineering::Materials Overall Water Splitting DFT Calculations Here we present a novel combined-strategy of cation tuning and surface engineering for the fabrication of highly active, earth-abundant, and robust two-dimensional Ni2P electrocatalyst. The nanosheets have lateral sizes of few hundred nm with thicknesses of ~6 nm. Our theoretical calculations suggest the effectiveness of vanadium doping and oxygen plasma, which do not only enhance the density-of-state at Fermi level, but also make the Ni sites more susceptible to OH− adsorption. The oxygen plasma treatment can increase the wettability of the catalyst toward KOH solution, improving the contact angle from 44.95° to 16.8° and also induce a higher BET surface area; hence, more active sites and lower charge transfer resistance are obtained. As a result, the catalyst requires small overpotentials of 257 and 108 mV to drive ±10 mA cm−2 alongside with modest Tafel slope of 43.5 and 72.3 mV dec−1 for oxygen evolution reaction and hydrogen evolution reaction in 1.0 M KOH solution, respectively. When employed for overall water splitting, the catalyst demonstrates a low voltage of 1.56 V to achieve 10 mA cm−2 with good stability and durability, outperforming the state-of-the-art IrO2 || Pt/C which needs 1.69 V. This work opens a new approach to engineer low-cost monometallic phosphides for highly efficient water splitting. MOE (Min. of Education, S’pore) 2020-05-15T04:55:47Z 2020-05-15T04:55:47Z 2018 Journal Article Dinh, K. N., Sun, X., Dai, Z., Zheng, Y., Zheng, P., Yang, J., . . . Yan, Q. (2018). O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting. Nano Energy, 54, 82-90. doi:10.1016/j.nanoen.2018.10.004 2211-2855 https://hdl.handle.net/10356/139071 10.1016/j.nanoen.2018.10.004 2-s2.0-85054706684 54 82 90 en Nano Energy © 2018 Elsevier Ltd. All rights reserved. |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering::Materials Overall Water Splitting DFT Calculations |
spellingShingle |
Engineering::Materials Overall Water Splitting DFT Calculations Dinh, Khang Ngoc Sun, Xiaoli Dai, Zhengfei Zheng, Yun Zheng, Penglun Yang, Jun Xu, Jianwei Wang, Zhiguo Yan, Qingyu O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
description |
Here we present a novel combined-strategy of cation tuning and surface engineering for the fabrication of highly active, earth-abundant, and robust two-dimensional Ni2P electrocatalyst. The nanosheets have lateral sizes of few hundred nm with thicknesses of ~6 nm. Our theoretical calculations suggest the effectiveness of vanadium doping and oxygen plasma, which do not only enhance the density-of-state at Fermi level, but also make the Ni sites more susceptible to OH− adsorption. The oxygen plasma treatment can increase the wettability of the catalyst toward KOH solution, improving the contact angle from 44.95° to 16.8° and also induce a higher BET surface area; hence, more active sites and lower charge transfer resistance are obtained. As a result, the catalyst requires small overpotentials of 257 and 108 mV to drive ±10 mA cm−2 alongside with modest Tafel slope of 43.5 and 72.3 mV dec−1 for oxygen evolution reaction and hydrogen evolution reaction in 1.0 M KOH solution, respectively. When employed for overall water splitting, the catalyst demonstrates a low voltage of 1.56 V to achieve 10 mA cm−2 with good stability and durability, outperforming the state-of-the-art IrO2 || Pt/C which needs 1.69 V. This work opens a new approach to engineer low-cost monometallic phosphides for highly efficient water splitting. |
author2 |
School of Materials Science and Engineering |
author_facet |
School of Materials Science and Engineering Dinh, Khang Ngoc Sun, Xiaoli Dai, Zhengfei Zheng, Yun Zheng, Penglun Yang, Jun Xu, Jianwei Wang, Zhiguo Yan, Qingyu |
format |
Article |
author |
Dinh, Khang Ngoc Sun, Xiaoli Dai, Zhengfei Zheng, Yun Zheng, Penglun Yang, Jun Xu, Jianwei Wang, Zhiguo Yan, Qingyu |
author_sort |
Dinh, Khang Ngoc |
title |
O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
title_short |
O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
title_full |
O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
title_fullStr |
O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
title_full_unstemmed |
O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
title_sort |
o2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting |
publishDate |
2020 |
url |
https://hdl.handle.net/10356/139071 |
_version_ |
1690658440923316224 |