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Amorphous Mo-doped NiS0.5Se0.5 Nanosheets@Crystalline NiS0.5Se0.5 Nanorods for High Current-density Electrocatalytic Water Splitting in Neutral Media |
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| Authors: | Dr Yang Wang Dr Xiaopeng Li Dr Zhong Huang Dr Haozhi Wang Dr Zelin Chen Dr Jinfeng Zhang Prof Xuerong Zheng Prof Yida Deng Prof Wenbin Hu |
| Institution: | 1. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228 P. R. China
Contribution: Data curation (lead), ?Investigation (lead), Methodology (lead), Validation (lead), Writing - original draft (lead);2. School of Materials Science and Engineering, Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin, 300384 China Contribution: Formal analysis (equal);3. State Key Laboratory of Marine Resource Utilization in South China Sea, College of Information and Communication Engineering, Hainan University, Haikou, 570228 P. R. China Contribution: Methodology (equal), Software (equal), Validation (equal);4. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228 P. R. China Contribution: Methodology (equal), Software (equal);5. School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072 P. R. China Contribution: Methodology (equal);6. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228 P. R. China;7. School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072 P. R. China Contribution: Funding acquisition (supporting) |
| Abstract: | It is vitally important to develop highly active, robust and low-cost transition metal-based electrocatalysts for overall water splitting in neutral solution especially at large current density. In this work, amorphous Mo-doped NiS0.5Se0.5 nanosheets@crystalline NiS0.5Se0.5 nanorods (Am?Mo?NiS0.5Se0.5) was synthesized using a facil one-step strategy. In phosphate buffer saline solution, the Am?Mo?NiS0.5Se0.5 shows tiny overpotentials of 48 and 209 mV for hydrogen evolution reaction (HER), 238 and 514 mV for oxygen evolution reaction (OER) at 10 and 1000 mA cm?2, respectively. Moreover, Am?Mo?NiS0.5Se0.5 delivers excellent stability for at least 300 h without obvious degradation. Theoretical calculations revealed that the Ni sites in the defect-rich amorphous structure of Am?Mo?NiS0.5Se0.5 owns higher electron state density and strengthened the binding energy of H2O, which will optimize H adsorption/desorption energy barriers and reduce the adsorption energy of OER determining step. |
| Keywords: | Amorphous Crystalline High-Current-Density Neutral Environment Water Splitting |