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Yang G, Peng W, Chen Z, Li S, Han Q, Hu R, Yuan B. In Situ Construction of Biphasic Boride Electrocatalysts on Dealloyed Bulk Ni-Mo Alloy as Self-Supporting Electrode for Water Splitting at High Current Density. ACS APPLIED MATERIALS & INTERFACES 2024; 16:28578-28589. [PMID: 38797977 DOI: 10.1021/acsami.4c04157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
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.
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Affiliation(s)
- Guangyao Yang
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510640, P.R. China
| | - Weiliang Peng
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510640, P.R. China
| | - Zhipeng Chen
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510640, P.R. China
| | - Shaobo Li
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510640, P.R. China
| | - Qiying Han
- Guangdong Province Waste Lithium Battery Clean Regeneration Engineering Technology Research Center, Zhaoqing 526116, P.R. China
- Guangdong Jinsheng New Energy Co., Ltd., Zhaoqing 526116, P.R. China
| | - Renzong Hu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510640, P.R. China
- Guangdong Province Waste Lithium Battery Clean Regeneration Engineering Technology Research Center, Zhaoqing 526116, P.R. China
| | - Bin Yuan
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510640, P.R. China
- Guangdong Province Waste Lithium Battery Clean Regeneration Engineering Technology Research Center, Zhaoqing 526116, P.R. China
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Zeng H, Zhou Z, Li W, Li L, Tang R, Xiong S, Gong D, Huang Y, Bai L, Deng Y. Revealing the synergistic effect between radical and non-radical species of sulfur-doped carbon nitride for ciprofloxacin removal: Based on density functional theory study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 915:170191. [PMID: 38244633 DOI: 10.1016/j.scitotenv.2024.170191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/12/2024] [Accepted: 01/13/2024] [Indexed: 01/22/2024]
Abstract
The distinct characteristics of active species produced during the photocatalytic reaction can result in alterations in the degradation routes of organic pollutants with diverse chemical structures. The relationship between the active species and degradation pathways of organic pollutants lacks a direct experimental or characterization method, so in-depth research is still needed to understand the details of their interactions. In this study, sulfur-doped bulk carbon nitride (SBCN) was prepared based on bulk carbon nitride (BCN), and the process of S-doping enhancing the production of O21 was revealed. Through the degradation experiment, the degradation rate of CIP by SBCN reached 91 %, which was higher than that of BCN (66 %). The increase of degradation rate was mainly attributed to the increase of O21. Through the density functional theory (DFT) calculation of CIP and its degradation intermediate, due to the preferential oxidation of CIP by O21, O21 changes the initial degradation direction of CIP, releasing more attack sites for ˙O2-, thereby achieving more efficient degradation of CIP through the synergy of O21 and ˙O2-. In this study, the attack preferences of the active species and their synergistic promotion provide important insights for the efficient photocatalytic degradation of organic pollutants.
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Affiliation(s)
- Hao Zeng
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China; Hunan Academy of Agricultural Sciences, Changsha 410125, China
| | - Zhanpeng Zhou
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China; College of Resources, Hunan Agricultural University, Changsha 410128, China
| | - Wenbo Li
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China; College of Resources, Hunan Agricultural University, Changsha 410128, China
| | - Ling Li
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China; College of Resources, Hunan Agricultural University, Changsha 410128, China
| | - Rongdi Tang
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China; College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China
| | - Sheng Xiong
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China; College of Resources, Hunan Agricultural University, Changsha 410128, China
| | - Daoxin Gong
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Ying Huang
- College of Resources, Hunan Agricultural University, Changsha 410128, China
| | - Lianyang Bai
- Hunan Academy of Agricultural Sciences, Changsha 410125, China
| | - Yaocheng Deng
- College of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China.
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