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Wang S, Liu X, Chen H, Kong J, Guo Y, Lü W, Wang Z, Liu Z, Lü Z, Wang Z. Gas-Phase-Induced Engineering for Fabrication of 3D Hierarchical Porous Nickel and Its Application toward High-Performance Supercapacitors. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26547-26556. [PMID: 38727094 DOI: 10.1021/acsami.4c02760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2024]
Abstract
Commercial nickel foam (NF), which is composed of numerous interconnected ligaments and hundred-micron pores, is widely acknowledged as a current collector/electrode material for catalysis, sensing, and energy storage applications. However, the commonly used NF often does not work satisfactorily due to its smooth surface and hollow structure of the ligaments. Herein, a gas-phase-induced engineering, two-step gaseous oxidation-reduction (GOR) is presented to directly transform the thin-walled hollow ligament of NF into a three-dimensional (3D) nanoporous prism structure, resulting in the fabrication of a unique hierarchical porous nickel foam (HPNF). This 3D nanoporous architecture is achieved by utilizing the spontaneous reconstruction of nickel atoms during volume expansion and contraction in the GOR process. The process avoids the involution of acid-base corrosion and sacrificial components, which are facile, environmentally friendly, and suitable for large-scale fabrication. Furthermore, MnO2 is electrochemically deposited on the HPNF to form a supercapacitor electrode (HPNF/MnO2). Because of the fully open structure for ion transport, superhydrophilic properties, and the increased contact area between MnO2 and the current collector, the HPNF/MnO2 electrode exhibits a high specific capacitance of 997.5 F g-1 at 3 A g-1 and remarkable cycling stability with 99.6% capacitance retention after 20000 cycles in 0.1 M Na2SO4 electrolyte, outperforming most MnO2-based supercapacitor electrodes.
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Affiliation(s)
- Shuo Wang
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Xutong Liu
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Honglei Chen
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Jin Kong
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Yingshuang Guo
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Weiming Lü
- Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Zhengjia Wang
- Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Zhiguo Liu
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Zhe Lü
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
| | - Zhihong Wang
- School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People's Republic of China
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Hou L, Li Z, Jang H, Kim MG, Cho J, Liu S, Liu X. Grain Boundary Tailors the Local Chemical Environment on Iridium Surface for Alkaline Electrocatalytic Hydrogen Evolution. Angew Chem Int Ed Engl 2024; 63:e202315633. [PMID: 38151468 DOI: 10.1002/anie.202315633] [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: 10/16/2023] [Revised: 11/14/2023] [Accepted: 12/27/2023] [Indexed: 12/29/2023]
Abstract
Even though grain boundaries (GBs) have been previously employed to increase the number of active catalytic sites or tune the binding energies of reaction intermediates for promoting electrocatalytic reactions, the effect of GBs on the tailoring of the local chemical environment on the catalyst surface has not been clarified thus far. In this study, a GBs-enriched iridium (GB-Ir) was synthesized and examined for the alkaline hydrogen evolution reaction (HER). Operando Raman spectroscopy and density functional theory (DFT) calculations revealed that a local acid-like environment with H3 O+ intermediates was created in the GBs region owing to the electron-enriched surface Ir atoms at the GBs. The H3 O+ intermediates lowered the energy barrier for water dissociation and provided enough hydrogen proton to promote the generation of hydrogen spillover from the sites at the GBs to the sites away from the GBs, thus synergistically enhancing the hydrogen evolution activity. Notably, the GB-Ir catalyst exhibited a high alkaline HER activity (10 mV @ 10 mA cm-2 , 20 mV dec-1 ). We believe that our findings will promote further research on GBs and the surface science of electrochemical reactions.
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Affiliation(s)
- Liqiang Hou
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Zijian Li
- Department of Chemistry, City University of Hong Kong, Hong Kong, SAR, China
| | - Haeseong Jang
- Department of Advanced Materials Engineering, Chung-Ang University, Seoul, 156-756, South Korea
| | - Min Gyu Kim
- Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 790-784, Korea
| | - Jaephil Cho
- Department of Energy Engineering, Department of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, South Korea
| | - Shangguo Liu
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Xien Liu
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
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