|
1
|
Sarkar S, Ali SA, Sarkar S, Raihan A, Banerjee S, Patra AK. Hierarchical Bifunctional NiO Electrocatalyst: Highly Porous Structure Boosting the Water Splitting Activity. Chem Asian J 2024:e202400630. [PMID: 39152731 DOI: 10.1002/asia.202400630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Revised: 07/21/2024] [Accepted: 08/16/2024] [Indexed: 08/19/2024]
Abstract
The development of an efficient, low-cost and earth-abundant electrocatalyst for water splitting is crucial for the production of sustainable hydrogen energy. However their practical applications are largely restricted by their limited synthesis methods, large overpotential and low surface area. Hierarchical materials with a highly porous three-dimensional nanostructure have garnered significant attention due to their exceptional electrocatalytic properties. These hierarchical porous frameworks enable the fast electron transfer, rapid mass transport, and high density of unsaturated metal sites and maximize product selectivity. Here the process involved obtaining monodispersed microrod-shaped Ni(OH)2 through a hydrothermal reaction, followed by a heat treatment to convert it into hierarchical microrod-shaped NiO materials. N2 sorption analysis revealed that the BET surface area increased from 9 to 89 m2/g as a result of the heat treatment. The hierarchical microrod-shaped NiO materials demonstrated outstanding bifunctional electrocatalytic water splitting capabilities, excelling in both HER and OER in basic solution. Overpotential of 347 mV is achieved at 10 mA/cm2 for OER activity, with a Tafel slope of 77 mV/dec. Similarly, overpotential of 488 mV is achieved at 10 mA/cm2 for HER activity, with a Tafel slope of 62 mV/dec.
Collapse
Affiliation(s)
- Sunny Sarkar
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741235, India
| | - Sk Afsar Ali
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741235, India
| | - Soumita Sarkar
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741235, India
| | - Abu Raihan
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741235, India
| | - Soumalya Banerjee
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741235, India
| | - Astam K Patra
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal, 741235, India
| |
Collapse
|
|
2
|
Wang H, Ma Q, Sun F, Shao Y, Zhang D, Sun H, Li Z, Wang Q, Qi J, Wang B. Oxygen Vacancy and Interface Effect Adjusted Hollow Dodecahedrons for Efficient Oxygen Evolution Reaction. Molecules 2023; 28:5620. [PMID: 37570592 PMCID: PMC10419998 DOI: 10.3390/molecules28155620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/19/2023] [Accepted: 07/21/2023] [Indexed: 08/13/2023] Open
Abstract
Metal-organic frameworks (MOFs) with special morphologies provide the geometric morphology and composition basis for the construction of platforms with excellent catalytic activity. In this work, cobalt-cerium composite oxide hollow dodecahedrons (Co/Cex-COHDs) with controllable morphology and tunable composition are successfully prepared via a high-temperature pyrolysis strategy using Co/Ce-MOFs as self-sacrificial templates. The construction of the hollow structure can expose a larger surface area to provide abundant active sites and pores to facilitate the diffusion of substances. The formation and optimization of phase interface between Co3O4 and CeO2 regulate the electronic structure of the catalytic site and form a fast channel favorable to electron transport, thereby enhancing the electrocatalytic oxygen evolution activity. Based on the above advantages, the optimized Co/Ce0.2-COHDs obtained an enhanced oxygen evolution reaction (OER) performance.
Collapse
Affiliation(s)
- Huan Wang
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Qian Ma
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Fengmin Sun
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Yachuan Shao
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Di Zhang
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Huilan Sun
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Zhaojin Li
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Qiujun Wang
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| | - Jian Qi
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100049, China
| | - Bo Wang
- Hebei Key Laboratory of Flexible Functionals Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; (H.W.); (Q.M.); (F.S.); (Y.S.); (D.Z.); (H.S.); (Z.L.); (Q.W.)
| |
Collapse
|
|
3
|
Kim M, Park YH, Kim MH, Jin X, Hwang SJ. Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials. Chem Asian J 2021; 16:3937-3943. [PMID: 34585836 DOI: 10.1002/asia.202101013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 09/28/2021] [Indexed: 11/11/2022]
Abstract
The synergetic combination of defect engineering and graphene coupling enables to develop an effective way of exploring efficient bifunctional electrocatalyst/electrode materials. Defect-engineered amorphous MoO2 -reduced graphene oxide (rGO) nanohybrid was synthesized by soft-chemical reduction of K2 MoO4 in graphene oxide colloids. Mo K-edge X-ray absorption spectroscopy clearly demonstrates the rutile-type local atomic structure of amorphous MoO2 with significant oxygen vacancies and intimate electronic coupling with rGO. The defect-introduced MoO2 -rGO nanohybrid shows excellent bifunctionality as electrocatalyst for hydrogen evolution reaction and electrode for sodium-ion batteries, which are superior to those of crystalline MoO2 -rGO homologue. The beneficial effect of simultaneous defect control and rGO coupling can be ascribed to the provision of oxygen vacancies acting as active sites, the increase of electrical conductivity, and the improvement of reaction kinetics.
Collapse
Affiliation(s)
- Minji Kim
- Department of Chemistry and Nanoscience, College of Natural Sciences, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Yeon Hu Park
- Department of Materials Science and Engineering, College of Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Myung Hwa Kim
- Department of Chemistry and Nanoscience, College of Natural Sciences, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Xiaoyan Jin
- Department of Materials Science and Engineering, College of Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seong-Ju Hwang
- Department of Materials Science and Engineering, College of Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| |
Collapse
|