JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Lili Cui,Qiaoling Zhang,Xingquan He
The Fe 3 C encapsulated in nitrogen doped carbon nanotubes electrocatalysts (Fe 3 C@N-CNTs) are constructed derived from iron metal-organic framework (Fe-MOF) by a facile method. It is well accepted that the catalytic performance is dependent on the morphology of the electrocatalyst. Thus, here, the morphology of the carbon nanotubes is obtained by tuning the species of iron salt and the annealing temperature, the optimal material shows nanotube morphology and high surface area. Also, it is noted that FeNC-Cl/800 has higher N content compared to FeNC-NO 3 /800, indicating that Cl − favor in promoting nitrogen doping. In alkaline condition, the optimized Fe 3 C@N-CNTs catalyst exhibits more positive onset and half-wave potentials (0.98, 0.85 V vs RHE) than other contrast samples. Importantly, it displays a more positive onset and half-wave potentials of 0.82, 0.68 V vs RHE in acidic medium. It shows a 4e − pathway towards ORR, good capacity of stability and methanol tolerance in both alkaline and acidic media. The excellent electrocatalytic performance arises from various active sites (Fe 3 C and N doping), pretty morphology and hierarchically porous structure.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
JinHyok Ho,Yang Li,Yexin Dai,TongIl Kim,Jiao Wang,Jun Ren,HakSung Yun,Xianhua Liu
In this paper, CoMn 2 O 4 /NC nanocomposites were synthesized via a facile ionothermal synthesis route, and their electrocatalytic performance for oxygen reduction reaction (ORR) was investigated in a direct glucose alkaline fuel cell (DGAFC). The CoMn 2 O 4 spinel supported on nitrogen-doped carbon was successfully synthesized with the assistance of the ionic liquid [C 6 mim]Cl. The nanocomposite exhibited excellent electrocatalytic activity towards ORR. Especially, CoMn 2 O 4 /NC achieved a half wave potential of 0.81 V (vs RHE) and a maximum diffusion limiting current density of 5.2 mA cm −2 , that are very close to commercial Pt/C catalyst (E 1/2 = 0.83 V vs RHE , J d = 5.0 mA cm −2 ). In addition, the catalytic performance of CoMn 2 O 4 /NC was investigated in DGFC. The fuel cell with a CoMn 2 O 4 /NC air cathode achieved a peak power density of 23.72 W m −2 , which was even superior to that with a commercial Pt/C air cathode. This work revealed that ionic liquid is a viable reaction medium for preparation of catalyst with robust activity.
研究领域:
材料科学
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电化学
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能源科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peng Wei,Xiaogang Li,Zhimin He,Xueping Sun,Qirui Liang,Zhengying Wang,Chun Fang,Qing Li,Hui Yang,Jiantao Han,Yunhui Huang
The flexible design and construction of oxygen reduction reaction (ORR) catalysts with high activity, great stability, and superior cost efficiency are essential for metal-air batteries and fuel cells. Hollow carbon nanotubes (CNTs) are considered promising electrocatalysts owing to their outstanding thermal stability, robust chemical properties, and high specific surface area. Herein, a convenient and controllable solid-phase route is proposed for the preparation of porous nitrogen (N) and boron (B) co-doped carbon nanotubes (NBCNT) by using tubular polypyrrole (PPy) and sodium tetraphenylboron ((C 6 H 5 ) 4 BNa), in which (C 6 H 5 ) 4 BNa serves not only as a B source but also as a pore-forming agent that can help to regulate N configuration and expose more active sites. Due to the synergistic effects of porous one-dimensional hollow structure and the binary heteroatom doping, the optimized NBCNT catalyst demonstrates superior catalytic performance for ORR in both acidic and alkaline electrolytes. Moreover, Zn-air batteries are constructed based on the as-prepared catalysts, which reveal a high operating voltage (1.43 V) and peak power density (173.93 mW cm −2 ), further demonstrating a comparable electrocatalytic performance of the catalysts to commercial Pt/C catalyst. This work reveals a novel construction of high-efficiency and cost-effective metal-free catalysts for various energy conversion and storage technologies.
研究领域:
材料科学
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电化学
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能源技术
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产品关联
DOI
高影响因子
IONICS
·
2020
·Vol. 27
·期 2
·721-728
·
IF 2.394
Hu Siqi,Liu Yang,Peng Xianhui,Li Mian,Zhang Chengxu,Dong Peng,Sui Yudong,Han Lina,Zhang Yingjie
The exploration of cheap, stable, and highly efficient non-precious metal catalyst is conducive to extending the practical applications of zinc-air batteries (ZABs). Herein, a simple, environmental friendly and low-cost method was proposed to fabricate nitrogen-doped carbon–coated TiN nanoparticle composites (TiN@NC). Dicyandiamide was applied as the nitrogen source instead of ammonia reduction, based on which Ti 0.95 Co 0.05 N@NC was synthesized. Oxygen reduction reaction (ORR) measurement shows that the onset potential of Ti 0.95 Co 0.05 N@NC was 30 mV higher compared to TiN@NC, which is attributed: (i) Cobalt was doped into TiN lattice. (ii) After cobalt doping, the graphitization degree of carbon was increased to facilitate electron transport. (iii) Controlling the reservation of nitrogen to form more N-C active sites in Ti 0.95 Co 0.05 N@NC may further promote the performance of ORR. The performance of the ZABs was effectively improved after cobalt doping. It is believed to make it more convenient to prepare binary transition metal nitride nanostructures.
研究领域:
材料科学
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电化学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 44
·15512-15519
·
IF 4.029
Lili Yao,Wenxiu Yang,Huiling Liu,Jianbo Jia,Guohua Wu,Dan Liu,Ting Liu,Taixing Tan,Cheng Wang
The design of efficient mixed Mn–Co oxides as oxygen reduction reaction (ORR) electrocatalysts in alkaline media has been boosted nowadays. Recently, multivariant MOFs have been demonstrated as versatile precursors to construct these mixed metal oxides. Herein, we synthesized four mixed Mn–Co oxide samples via simply annealing their MIL-53 precursors with different Co/Mn molar ratios. These four samples were dominated by three kinds of Mn–Co spinel phases. The mixed Mn–Co oxides showed enhanced ORR performances compared with the single metal counterparts in alkaline media. In particular, the sample containing a pure MnCo2O4 phase exhibited the highest activity with a half-wave potential of 0.772 V (vs. RHE), only 40 mV negative compared with that of commercial Pt/C. The H2O2 yield was calculated to be below 12.1%, corresponding to the high diffusion-limited current density along with the high electron transfer number. The surface defects, active Mn4+/Mn3+ and electrochemically active surface area together affected the ORR performances of these mixed Mn–Co oxides. The present work highlights the facile controllability of divalent MIL-53 analogues for highly efficient mixed Mn–Co oxides in ORR electrocatalysis.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Yu Wang,Feng Gu,Lei Cao,Lanlan Fan,Tianjie Hou,Qian Zhu,Yu Wu,Shixian Xiong
Developing non-noble metal oxygen reduction reaction (ORR) electrocatalysts with high performance, excellent stability, and low-cost is crucial for the industrialization of fuel cells. Herein, trace level Co modified 3D hybrid titanium carbonitride MXene and boron-carbon-nitrogen nanotubes catalyst (TiCN–BCN–Co) is fabricated by spray-lyophilization and high-temperature pyrolysis . This strategy not only avoids the oxidation of Ti 3 C 2 T x MXene, but also introduces nitrogen atoms into the titanium carbide lattice to form a more electrocatalytically active TiCN crystal phase. The obtained TiCN–BCN–Co exhibits superior ORR catalytic activity with a positive half-wave potential of 0.83 V vs. RHE and outperforms commercial Pt/C in terms of stability and methanol tolerance. Impressively, the Zn-air battery with TiCN–BCN–Co cathode achieves a superior specific capacity of 791 mAh g −1 and long-term stability of 200 h.
研究领域:
材料科学
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电化学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Shiang Li,Chao Feng,Yuehong Xie,Changyan Guo,Liugen Zhang,Jide Wang
Transition metal-based nitrogen-doped carbon materials have been proved to be a promising low-cost electrocatalyst for oxygen reduction reaction (ORR), which is a critical step in systems such as fuel batteries and zinc-air batteries. In this paper, transition metal (cobalt) N-doped carbon nanomaterials derived from metal-organic framework (MOFs) were synthesized by calcination of ZIF-67 precursors at high temperature (Co@NCNTs). Nitrogen atoms were introduced into the carbon matrix by capturing volatile CNx from dicyandiamide, and porous carbon nanotube structures with N-doped and uniformly dispersed active sites were obtained. The effects of different carbonization temperatures and molar ratio of Co/2-MI on the catalytic activity of materials for ORR reaction were studied. It was found that the Co@NCNTs prepared at 700 ℃ with the ratio of cobalt metal to dimethylimidazole of 1: 8 shows excellent ORR activity in both acidic and alkaline electrolytes . In alkaline conditions, the half-wave potential E 1/2 = 0.81 V, initial potential E onset = 0.89 V, and limiting current density even reaching 7.4 mA cm −2 . And in acidic electrolytes, E 1/2 = 0.66 V, while the limiting current density is 6.4 mA cm −2 , which is still better than that of Pt/C. Its excellent ORR performance is due to the synergistic effect of the porous carbon nanotube structure, N-doped carbon and Co-Nx active sites. Meanwhile, the optimum catalyst also shows better stability and methanol resistance than Pt/C in both acidic and alkaline electrolytes .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Jingshun Shen,Qi Liu,Qiqi Sun,Jianwei Ren,Xue Liu,Zuoxu Xiao,Chuanwang Xing,Yuexing Zhang,Guangwu Yang,Yanli Chen
A novel two-dimensional (2D) single-atom Fe/N/C catalyst (Fe 1 Zn 30 NC PDI ) has been prepared upon pyrolyzing a well-designed quasi-Fe-/Zn-phthalocyanine-based polymer (qFePc 1 @qZnPc 30 @PDI). In the qFePc 1 @qZnPc 30 @PDI precursor, qFePc moieties containing Fe-N 4 sites are efficiently segregated by lots of qZnPc moieties connected together by perylene linkers, which not only leads to the larger specific area in the resulting Fe 1 Zn 30 NC PDI but more importantly ensures the in-situ formation of Fe-N 4 sites on the self-supporting 2D N-doped carbon backbone. Impressively, Fe 1 Zn 30 NC PDI exhibites its superior oxygen reduction reaction (ORR) electro-catalytic activity and peroxidase (POD)-like activity. For ORR in an alkaline medium, it exhibites a much higher onset potential of 0.97 V and half-wave potential of 0.89 V than 20 wt% Pt/C catalyst with good durability of 92 % retention rate after 20000 s. And, Fe 1 Zn 30 NC PDI also shows better peak power density (86 mW cm −2 ) compared with 20 wt% Pt/C in Zn-air battery. Benefiting from the specific POD-like activity of Fe-N 4 , the Fe 1 Zn 30 NC PDI also shows excellent and selective performance in colorimetric H 2 O 2 sensing, with the ultrafast response (30 s), a low limit of detection (10 nM), and good robustness. This work sheds light on a promising design concept for synthesizing 2D polymer-derived single-atom multifunctional catalysts.
研究领域:
材料科学
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电化学
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分析化学
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产品关联
DOI
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 5
·e202201469
·
IF 4.5
Zhe Jia,Jiayin Shang,Kaijing Xue,Xi Yang,Sumin Wang,Changhua Xu,Qiguan Wang
Graphical High OER/ORR performances : boosted oxygen reduction reaction (ORR) as well as optimized oxygen evolution reaction (OER) and high-activity zinc-air batteries (ZAB), from a nitrogen-doped carbon nanomaterial (NCM) inserted Ni−Co layered double hydroxide (NiCo-LDH) electrocatalyst on nickel foam are achieved. The super thin NCM prepared by calcination of self-assembled perylenetetracarboxylic dianhydride/dicyandiamide improves the conductivity, electroactive surface area of NiCo-LDH nanoplates. Herein, a high performance bifunctional catalyst was prepared by inserting N-doped nanomaterials into Ni−Co layered dihydroxides (NiCo-LDH) nanoplates for high performance zinc-air battery. By using self-assembly of perylenetetracarboxylic dianhydride and dicyandiamide in the hydrothermal condition, a nitrogen-containing super thin carbonaceous nanosheet is achieved after calcination. Then NCM inserted NiCo-LDH nanoplates attached to nickel foam (NiCo-LDH/NCM@NF) are synthesized by in-situ production of NiCo-LDH species on NCM wrapped NF. The specific NCM improves the conductivity, electroactive surface area and the ORR/OER bifunctional activity of NiCo-LDH nanoplates. In addition, benefited from the formed rich oxygen vacancies, NiCo-LDH/NCM@NF delivers the low OER overpotential (352 mV at 50 mA cm −2 ) and boosted ORR performance with a half-wave potential of 0.765 V vs RHE. As the air cathode, the fabricated ZAB devices show a satisfactory capacity of 685 mAh g −1 and the energy density of 158 mW cm −2 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Bin Wang,Miao Tang,Wanting Li,Wenjing Dong,Xiaowen Ge,Naibao Huang
In order to increase the activity and decrease the cost of oxygen reduction reaction (ORR) catalyst, S self-doped porous carbon nanospheres ORR catalyst was prepared by pyrolyzing the block copolymer F127 grafted with 3-mercapto-propanoicaci. The composition and microstructure were characterized and its electrochemical performance was also investigated in O 2 -saturated 0.1 M KOH solutions. The results showed that, among all the obtained samples, C-S-750 had a porous carbon nanosphere structure with the doped sulfur of 7.08 at % and a maximum specific surface area of 776.3 m 2 /g. The onset potential, half-wave potential and limiting current density of C-S-750 were 0.92 V (versus RHE) and 0.80 V (versus RHE) and 5.77 mA/cm 2 @0.45 V in O 2 -saturated 0.1 M KOH solution, respectively, which were close to that of commercial 20% Pt/C catalysts. This provides a new way to introduce and increase the doped heteroatom in metal-free ORR catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Cong Yong,Yipu Xu,Hui Yu,Peiran Wu,Jiansong Wang,Liu-Liu Shen,Gui-Rong Zhang,Donghai Mei
ZIF-derived carbons (ZDCs) represent a novel category of non-precious metal catalysts (NPMCs) for the oxygen reduction reaction (ORR). Nevertheless, establishing the correlation between their structure and performance is challenging due to their diverse structural properties and ill-defined active site moieties. Here we investigate the effect of ZIF-67 derived carbon’s particle size and corresponding distribution of assorted nitrogen functionalities on the ORR. Our findings reveal a substantial increase in ORR activity with decreasing ZDC particle size, while the exact influence of nitrogen functionalities remains uncertain. Most importantly, the present work unveils a correlation between the ORR activity and the site density (SD) of Co-N x within the ZDC materials, which can be attributed to the concurrently increasing SD and accessibility of Co-N x on the ZDC particles with small sizes. The present work provides novel insights into the optimization of ZDCs as high-performance NPMCs for ORR in alkaline electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2023
·
IF 5.4
Lin Ge,Dong-Mei Huang,Qin-Chao Xu,Jing Shi,Shuai Chen
An innovative, high-performance, non-noble-metal-based oxygen reduction reaction (ORR) catalyst must be developed utilizing a new and cost-effective technique. ZrO 2 has the merits of high stability, low toxicity, good catalytic activity, and low enthalpy for atomic oxygen adsorption. However, the poor conductivity restricts its application as an ORR catalyst. Here, we successfully prepared ZrO 2 nanoparticles / nitrogen-rich two-dimensional carbon nanosheet composites as ORR catalysts using a straightforward, solvent-free, one-step pyrolysis approach. Due to the unique component and structure characteristics, ZrO 2 @N-C-900 demonstrates remarkable ORR performances in alkaline electrolytes, such as high half-wave potential (0.82 V vs. RHE), higher current density (J L = 6.4 mA cm −2 ), and outstanding long term stability (95 % for 36,000 s). Especially, when used in a Zn-air battery, ZrO 2 @N-C-900 exhibited a power density of 148 mW cm −2 , exceeding that of 20 % Pt/C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）