In Situ Construction of Biphasic Boride Electrocatalysts on Dealloyed Bulk Ni-Mo Alloy as Self-Supporting Electrode for Water Splitting at High Current Density
By
Yang, GY (Yang, Guangyao) [1] , [2] ; Peng, WL (Peng, Weiliang) [1] , [2] ; Chen, ZP (Chen, Zhipeng) [1] , [2] ; Li, SB (Li, Shaobo) [1] , [2] ; Han, QY (Han, Qiying) [3] , [4] ; Hu, RZ (Hu, Renzong) [1] , [2] , [3] ; Yuan, B (Yuan, Bin) [1] , [2] , [3]
(provided by Clarivate)
Source
ACS APPLIED MATERIALS & INTERFACES
Volume16Issue22Page28578-28589
DOI10.1021/acsami.4c04157
Published
MAY 27 2024
Early Access
MAY 2024
Indexed
2024-06-03
Document Type
Article
Abstract
Nickel-molybdenum-boron (Ni-Mo-B)-based catalysts with biphasic interfaces are highly advantageous in bifunctional electrocatalytic activity in alkaline water-splitting. However, it remains an ongoing challenge to obtain porous Ni-Mo alloy substrates that provide stable adhesion to catalysts, ensuring the long-term performance of bifunctional self-supporting electrodes at a high current density. Herein, a porous Ni-Mo alloy substrate was effectively obtained by a cost-effective dealloying process on a commercial Ni-Mo alloy with high-energy crystal planes. Subsequently, the Mo2NiB2/Ni3B bifunctional catalyst was in situ synthesized on this substrate via boriding heat treatment, resulting in outstanding catalytic activity and stability. Density functional theory (DFT) calculations reveal that the abundant biphasic interfaces and surface-reconstructed sites of the Mo2NiB2/Ni3B catalyst can decrease the energy barriers for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Thus, the designed self-supporting electrodes show bifunctional catalytic activity with overpotentials of 151 mV for HER and 260 mV for OER at a current density of 10 mA cm(-2). Markedly, the assembled water electrolyzer can be driven up to 10 mA cm(-2) at 1.64 V and maintain catalytic activity at a high current density of 1000 mA cm(-2) for 100 h. The new strategy is expected to provide a low-cost scheme for designing self-supporting bifunctional electrodes with high activity and excellent stability and contribute to the development of hydrogen energy technology.
Keywords
Author Keywordsdealloying processporous self-supporting electrodesbiphasic transition metal boridessurface reconstructionbifunctional electrocatalystsalkaline water-splitting
Keywords PlusEVOLUTION REACTIONHYDROGENTECHNOLOGIESEFFICIENTENERGYPERFORMANCE
Author Information
Corresponding Address
Yuan, Bin
(corresponding author)
South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
Corresponding Address
Yuan, Bin
(corresponding author)
Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
Corresponding Address
Yuan, Bin
(corresponding author)
Guangdong Prov Waste Lithium Battery Clean Regener, Zhaoqing 526116, Peoples R China
E-mail Addresses
apsheng@scut.edu.cn
Addresses
1 South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
2 Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
3 Guangdong Prov Waste Lithium Battery Clean Regener, Zhaoqing 526116, Peoples R China
4 Guangdong Jinsheng New Energy Co Ltd, Zhaoqing 526116, Peoples R China
E-mail Addresses
apsheng@scut.edu.cn
Categories/ Classification
Research AreasScience & Technology - Other TopicsMaterials Science
Citation Topics
2 Chemistry
2.62 Electrochemistry
2.62.76 Oxygen Reduction Reaction
Sustainable Development Goals
07 Affordable and Clean Energy
Web of Science Categories
Nanoscience & NanotechnologyMaterials Science, Multidisciplinary