【公開日：2024.07.25】【最終更新日：2024.06.21】
課題データ / Project Data
課題番号 / Project Issue Number
23NU0406
利用課題名 / Title
Synthesis nanocatalyst for electrochemical CO2 reduction and CO2 conversion technology
利用した実施機関 / Support Institute
名古屋大学 / Nagoya Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）その他/Others（副 / Sub）-
キーワード / Keywords
カーボン系材料/ Carbon related materials, 触媒材料/ Catalyst materials, ,電子顕微鏡/ Electronic microscope,X線回折/ X-ray diffraction,電子分光/ Electron spectroscopy
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
Suchada Sirisomboonchai
所属名 / Affiliation
名古屋大学大学院 工学研究科
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
NU-207：X線光電子分光装置
NU-002：X線粉末回折装置
NU-004：走査型電子顕微鏡（SEM）
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
In this study, we introduce catalysts designed for electrochemical CO2 reduction applications, along with a novel CO2 conversion technology. Our approach involves the meticulous synthesis of catalyst materials, incorporating metal atom catalysts supported on carbon and metal catalysts.
実験 / Experimental
The following scientific equipment was used for analysis: the NU-207 X-ray photoelectron spectrometer (Thermo Fisher Scientific) and ESCALAB250Xi were used to study the elemental composition and electronic structure. The NU-002 X-ray diffractometer (powder diffraction), Smart Lab (Rikaku) 3K 1d/2dDSC, 9kW was used to characterize the composite of catalysts. The morphology structure of catalysts was observed using the NU-004 Scanning electron microscope (SEM), JOEL Japan (JSM-7500F).
結果と考察 / Results and Discussion
Regarding the SEM results (Figure 1), Sodium citrate-derived carbon would be considered a proper substrate for a metal atom catalyst with a highly porous structure for electrochemical CO2 reduction application. Additionally, porous carbon was utilized as support material for metal-atom loading (Ni, Zn, and Mn). The Powder x-ray diffraction (PXRD) patterns (Figure 2) showed two broad peaks at 26º and 44º, indicating disordered carbon, which confirms the formation of N-doped carbon material without any metal agglomeration. Moreover, Pt/ZrO2 was utilized in the CO2 conversion technology experiment (Figure 3). The proportions and chemical species of the catalysts' surface were analyzed via X-ray photoelectron spectroscopy (XPS) as Figure 3. The 1 wt.-% Pt/ZrO2 was examined both in its fresh state and after reactions (upflow, midflow, and downflow). The O1s species was deconvoluted into two peaks at 534.1 eV and 536 eV, corresponding to surface lattice oxygen (Olatt) and surface adsorbed oxygen (Oads) of ZrO2. Further examination of the energy region of Pt 4f core levels in both the fresh and flow reaction states of the catalyst revealed two components. The freshly prepared catalyst showed a core level Pt 4f emission positioned at 75.3 eV, indicating a Pt2+ oxidation state. In contrast, the second component at 78.1 eV was attributed to Pt4+. The ZrO2 presented a Zr 3p binding energy peak at 337.6 eV and 351 eV, indicating Zr 3p3/2 and Zr 3p1/2, respectively. Based on the results, it can be observed that the corresponding intensity peak was reduced after the reaction.
図・表・数式 / Figures, Tables and Equations
Figure 1. SEM images of sodium citrate-derived carbon (noted name porous carbon).
Figure 2. PXPD pattern of porous carbon, Ni-NC, NiZn-NC, NiMn-NC, NiZnMn-NC, Zn-NC, Mn-C.
Figure 3. XPS spectra of 1 wt.-% Pt/ZrO2 catalyst (A) O1s, (B) Zr 3p and (C) Pt 4f.
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件