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Methanol Oxidation at Platinum Coated Black Titania Nanotubes and Titanium Felt Electrodes. Molecules 2022; 27:molecules27196382. [PMID: 36234915 PMCID: PMC9571902 DOI: 10.3390/molecules27196382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 09/19/2022] [Accepted: 09/23/2022] [Indexed: 11/16/2022] Open
Abstract
Optimized Pt-based methanol oxidation reaction (MOR) anodes are essential for commercial direct methanol fuel cells (DMFCs) and methanol electrolyzers for hydrogen production. High surface area Ti supports are known to increase Pt catalytic activity and utilization. Pt has been deposited on black titania nanotubes (bTNTs), Ti felts and, for comparison, Ti foils by a galvanic deposition process, whereby Pt(IV) from a chloroplatinate solution is spontaneously reduced to metallic Pt (at 65 °C) onto chemically reduced (by CaH2) TNTs (resulting in bTNTs), chemically etched (HCl + NaF) Ti felts and grinded Ti foils. All Pt/Ti-based electrodes prepared by this method showed enhanced intrinsic catalytic activity towards MOR when compared to Pt and other Pt/Ti-based catalysts. The very high/high mass specific activity of Pt/bTNTs (ca 700 mA mgPt−1 at the voltammetric peak of 5 mV s−1 in 0.5 M MeOH) and of Pt/Ti-felt (ca 60 mA mgPt−1, accordingly) make these electrodes good candidates for MOR anodes and/or reactive Gas Diffusion Layer Electrodes (GDLEs) in DMFCs and/or methanol electrolysis cells.
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Yu Y, Kang L, Sun L, Xu F, Pan H, Sang Z, Zhang C, Jia X, Sui Q, Bu Y, Cai D, Xia Y, Zhang K, Li B. Bimetallic Pt-Ni Nanoparticles Confined in Porous Titanium Oxide Cage for Hydrogen Generation from NaBH 4 Hydrolysis. NANOMATERIALS 2022; 12:nano12152550. [PMID: 35893518 PMCID: PMC9331945 DOI: 10.3390/nano12152550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/21/2022] [Accepted: 07/21/2022] [Indexed: 11/16/2022]
Abstract
Sodium borohydride (NaBH4), with a high theoretical hydrogen content (10.8 wt%) and safe characteristics, has been widely employed to produce hydrogen based on hydrolysis reactions. In this work, a porous titanium oxide cage (PTOC) has been synthesized by a one-step hydrothermal method using NH2-MIL-125 as the template and L-alanine as the coordination agent. Due to the evenly distributed PtNi alloy particles with more catalytically active sites, and the synergistic effect between the PTOC and PtNi alloy particles, the PtNi/PTOC catalyst presents a high hydrogen generation rate (10,164.3 mL∙min−1∙g−1) and low activation energy (28.7 kJ∙mol−1). Furthermore, the robust porous structure of PTOC effectively suppresses the agglomeration issue; thus, the PtNi/PTOC catalyst retains 87.8% of the initial catalytic activity after eight cycles. These results indicate that the PtNi/PTOC catalyst has broad applications for the hydrolysis of borohydride.
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Affiliation(s)
- Yuqian Yu
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Li Kang
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Lixian Sun
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
- School of Mechanical & Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China
- Correspondence: (L.S.); (F.X.); (H.P.)
| | - Fen Xu
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
- Correspondence: (L.S.); (F.X.); (H.P.)
| | - Hongge Pan
- School of New Energy Science and Technology, Xi’an Technological University, Xi’an 710021, China
- Correspondence: (L.S.); (F.X.); (H.P.)
| | - Zhen Sang
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Chenchen Zhang
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Xinlei Jia
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Qingli Sui
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Yiting Bu
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Dan Cai
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Yongpeng Xia
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Kexiang Zhang
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
| | - Bin Li
- Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.Y.); (L.K.); (Z.S.); (C.Z.); (X.J.); (Q.S.); (Y.B.); (D.C.); (Y.X.); (K.Z.); (B.L.)
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The Effect of Carbon Content on Methanol Oxidation and Photo-Oxidation at Pt-TiO2-C Electrodes. Catalysts 2020. [DOI: 10.3390/catal10020248] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The oxidation of methanol is studied at TiO2-supported Pt electrodes of varied high surface area carbon content (in the 30-5% w/w range) and C÷Ti atom ratio (in the 3.0-0.4 ratio). The Pt-TiO2 catalyst is prepared by a photo-deposition process and C nanoparticles (Vulcan XC72R) are added by simple ultrasonic mixing. The optimum C÷Ti atom ratio of the prepared catalyst for methanol electro-oxidation is found to be 1.5, resulting from the interplay of C properties (increased electronic conductivity and methanol adsorption), those of TiO2 (synergistic effect on Pt and photo-activity), as well as the catalyst film thickness. The intrinsic catalytic activity of the best Pt-TiO2/C catalyst is better than that of a commercial Pt/C catalyst and could be further improved by nearly 25% upon UV illumination, whose periodic application can also limit current deterioration.
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Wang P, Kulp K, Bron M. Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1475-1487. [PMID: 31431860 PMCID: PMC6664386 DOI: 10.3762/bjnano.10.146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 06/27/2019] [Indexed: 06/10/2023]
Abstract
Hierarchically structured 3-dimensional electrodes based on branched carbon nanotubes (CNTs) are prepared on a glassy carbon (GC) substrate in a sequence of electrodeposition and chemical vapor deposition (CVD) steps as follows: Primary CNTs are grown over electrodeposited iron by CVD followed by a second Fe deposition and finally the CVD growth of secondary CNTs. The prepared 3-dimensional CNT structures (CNT/CNT/GC) exhibit enhanced double-layer capacitance and thus larger surface area compared to CNT/GC. Pt electrodeposition onto both types of electrodes yields a uniform and homogeneous Pt nanoparticle distribution. Each preparation step is followed by scanning electron microscopy, while the CNTs were additionally characterized by Raman spectroscopy. In this way it is demonstrated that by varying the parameters during the electrodeposition and CVD steps, a tuning of the structural parameters of the hierarchical electrodes is possible. The suitability of the hierarchical electrodes for electrocatalytic applications is demonstrated using the methanol electro-oxidation as a test reaction. The Pt mass specific activity towards methanol oxidation of Pt-CNT/CNT/GC is approximately 2.5 times higher than that of Pt-CNT/GC, and the hierarchical electrode exhibits a more negative onset potential. Both structures demonstrate an exceptionally high poisoning tolerance.
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Affiliation(s)
- Pei Wang
- Martin-Luther-University Halle-Wittenberg, Faculty of Natural Sciences II, Department of Chemistry, 06120 Halle, Germany
| | - Katarzyna Kulp
- Martin-Luther-University Halle-Wittenberg, Faculty of Natural Sciences II, Department of Chemistry, 06120 Halle, Germany
| | - Michael Bron
- Martin-Luther-University Halle-Wittenberg, Faculty of Natural Sciences II, Department of Chemistry, 06120 Halle, Germany
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Zhang Q, Cao B, Fu M, Liu Y, Wang H, Fan X, Lu H, Zhang Y, Wang H. Template, surfactant, stabilizer free controllable synthesis of various morphologies platinum decorated ordered mesoporous carbon nano architecture for high–performance electrochemical sensing. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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