Advanced Sustainable Systems
·
2021
·Vol. 6
·期 1
·2100343
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IF 6.271
Yinghui Li,Yuanju Qu,Chaocheng Liu,Jiedong Cui,Ke Xu,Yang Li,Haoyu Shen,Zhouguang Lu,Hui Pan,Tao Xu,Detao Liu
Bifunctional oxygen reduction/oxidation reaction (ORR/OER) electrocatalysts derived from biomass are one of the most valuable materials in terms of sustainability, ecological economy and industrial manufacturing, and are emerging as a desired alternative to the commercial Pt/C and IrO 2 catalysts. This work demonstrates the processing of agricultural cornstalk waste of cornstalks into stable bifunctional ORR/OER catalysts with high-performance by a simple and cost-effective strategy. Rich hydrophilic active groups (e.g., hydroxyl groups) in the hierarchical porous structures of the native cornstalks enable the sufficient facile combination with transition metals (e.g., Co, Fe, Zn) and heteroatoms (e.g., B, N) from soluble Co(NO 3 ) 2 , ZnCl 2 , H 3 BO 3 , NH 4 Cl in a hydrothermal reaction. The pyrolytic evaporation of Zn 2+ in a high-temperature carbonization process facilitates the generation of abundant micropores and mesopores to increase specific surface areas (941.44 m 2 g −1 ) and also hinders aggregation between neighboring transition metals. The synergistic effects of N, B, Fe and Co doping in hierarchical porous biochar-structures contributes to outstanding bifunctional ORR/OER activities and working stabilities, outperforming commercial Pt/C and IrO 2 catalysts. Computational results further verify the valuable synergistic contributions based on density-functional theory (DFT). This approach opens up a new possibility for the fabrication of bifunctional biochar-based ORR/OER catalysts from artificial engineering and green processing for sustainable agricultural wastes.
研究领域:
材料科学
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能源科学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tianyan Lan,Hongmei Du,Yunwu Li,Konggang Qu,Jinsheng Zhao,Xianxi Zhang,Yunyun Dong,Yan Zhang,Xueyue Zhang,Danyang Zhang
The development of bifunctional electrocatalysts to reduce the polarization loss is essential to enhance the performance of Zn-air batteries. The combination of metal-organic frameworks (MOFs) with metal or metallic compounds provides a way to integrate their merits and effectively improve their electrocatalytic performances. However, previous synthesis of MOFs/metal oxides usually involves high-temperature calcination , which makes it difficult to control their morphologies. In this work, through a ligand-insufficient and high temperature controlled solvothermal reaction, innovative NiFe-MOF/NiFe 2 O 4 hollow nanospheres were one-pot prepared without using any shape-controlled agent or calcination process. The as-obtained NiFe-MOF/NiFe 2 O 4 shows better ORR and OER performance than pure NiFe-MOF and NiFe 2 O 4 , suggesting a synergetic effect between NiFe-MOF and NiFe 2 O 4 . The maximum power density of the liquid Zn-air battery assembled using NiFe-MOF/NiFe 2 O 4 as the air electrode catalyst is 158.4 mW cm −2 at 246.1 mA cm −2 . This work offers fresh thoughts into designing highly efficient MOF-derived electrocatalysts.
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
Materials Today Energy
·
2022
·
IF 9.257
Kaiyue Chen,Xingkun Wang,Canhui Zhang,Ren Xu,Huanlei Wang,Lei Chu,Minghua Huang
Breakthroughs in the design of robust bifunctional oxygen reduction/evolution reaction (ORR/OER) catalysts could put Zn–air batteries performance to the summit but remain full of challenges. In this work, the MnS phase was deliberately introduced into the Mott–Schottky Co/Co 9 S 8 for engineering a three-phases Co/Co 9 S 8 /MnS heterojunction on defect-rich N-doped mesoporous carbon substrate (Co/Co 9 S 8 /MnS-NMC). It affords abundant three-phases heterostructure interfaces that effectively accelerate the electron transfer and trigger further electronic structure reconfiguration, thus advancing the bifunctional ORR/OER activities. Benefiting from these structures, the Co/Co 9 S 8 /MnS-NMC possesses a half-wave potential of 0.84 V toward ORR and a low overpotential of 330 mV toward OER at a current density of 10 mA/cm 2 , catching up with those of commercial Pt/C and RuO 2 catalysts. It also endows the Zn–air batteries with a good power density, round-trip efficiency, and robust stability over 750 h, showcasing the promising potential in practical applications. This work not only provides a facile strategy to construct the three-phases heterojunction catalysts but also sheds light on developing the efficient and robust nonprecious metal-based bifunctional ORR/OER catalysts.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Batteries-Basel
·
2022
·Vol. 8
·期 12
·259
·
IF 5.938
Kaixin Li,Zhanhua Dong,Zhe Lü
The development of robust and efficient electrocatalysts for use in fuel cells and metal–air batteries has garnered a great deal of interest due to the quest for clean and renewable energy sources. In this paper, a promising Co-doped Pr0.5Ba0.4Ca0.1Fe1-xCoxO3-δ(x = 0, 0.2, 0.4, 0.6, 0.8; denoted as PBCFC-x, x = 0, 2, 4, 6, 8) with enhanced durability and electrocatalytic ORR/OER activity for zinc–air battery cathode catalysts is presented. Particularly, PBCFC-6 exhibits the best bifunctional catalytic activity in alkaline media among several materials, according to research using the RDE. The zinc–air battery with PBCFC-6 as the cathode catalyst delivered the smallest discharge–charge voltage difference at the current density of 10 mA·cm−2and only increased by 0.031 V after 220 cycles (220 h), demonstrating its superior bifunctional catalytic activity and durability. The optimized electrochemical performance of both OER and ORR as well as stability in zinc–air batteries might result from the higher electrical conductivity, increasing concentration of adsorbed oxygen, and the greater proportion of Fe4+(t2g3eg1) with optimal electron occupancy, owing to the partial replacement of Fe with Co.Keywords:Pr0.5Ba0.4Ca0.1Fe1-xCoxO3-δ;rechargeable zinc–air batteries;ORR/OER;bifunctional catalyst
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2022
·
IF 3.51
Chaocheng Liu,Yinghui Li,Jiedong Cui,Zhiyun Qian,Detao Liu
Here we report a simple efficient one-step strategy to fabricate Oxidation Reduction Reaction (ORR) or/and Oxygen Evolution Reaction (OER) electrocatalysts directly from agricultural cornstalks waste with hierarchical porous structures and massive active hydroxyl groups. CaCl 2 and NH 4 Cl activators were utilized to corrode the cornstalks in order to create a mesopore N-doped hybrid structure that was sufficiently stable under the high-temperature pyrolysis process, which prevented neighboring aggregates of transition metals. The synergistic effect of N, B and Fe, Co within the hierarchical biochar structures guaranteed a favorable ORR activity of 0.848 V and OER activity of 393 mV for the CaCl 2 sample, showed better stability than commercial Pt/C and IrO 2 catalysts.
研究领域:
材料科学
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电化学
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可再生能源
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环境科学
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催化
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Wenxuan Fan,Xiangmei Tang,Qingfeng Yi,Guang Li
Non precious metal catalysts (NMCs) are considered to have great potential for applications in oxygen reduction reaction (ORR) and water splitting reaction (OER and HER). Compared with traditional precious metal catalysts, NMCs have the characteristics of low cost, better catalytic performance, wider applicability, and better durability. This article reports a facile method for preparing layered Co-N-C catalysts by simple ball milling and pyrolysis of a mixture of graphite, ammonium carbonate, melamine and cobalt phthalocyanine. The synthesized nanoCo@bmGr and nanoCo@bmGr-EG samples exhibit excellent performance in ORR, OER and HER. For ORR in alkaline electrolyte, the nanoCo@bmGr and nanoCo@bmGr-EG present very close Tafel slopes to Pt/C catalyst. For OER under alkaline condition, the nanoCo@bmGr and nanoCo@bmGr-EG exhibit smaller Tafel slopes than IrO 2 catalyst, and at a current density of 10 mA∙cm −2 , their potential difference with IrO 2 is only 50 and 70 mV respectively. For the chronopotentiometric tests of OER at current densities of 20 and 30 mA∙cm −2 , the two samples show lower potentials than IrO 2 . In HER testing, nanoCo@bmGr and nanoCo@bmGr-EG display very similar onset potentials and Tafel slopes to Pt/C. This work provides a simple approach for preparing catalysts with good catalytic activity for ORR/OER/HER.
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
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 33
·期 5
·2007525
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IF 27.398
Jianhua Yan,Ying Wang,Yuanyuan Zhang,Shuhui Xia,Jianyong Yu,Bin Ding
Designing stable and efficient electrocatalysts for both oxygen reduction and evolution reactions (ORR/OER) at low-cost is challenging. Here, a carbon-based bifunctional catalyst of magnetic catalytic nanocages that can direct enhance the oxygen catalytic activity by simply applying a moderate (350 mT) magnetic field is reported. The catalysts, with high porosity of 90% and conductivity of 905 S m −1 , are created by in situ doping metallic cobalt nanodots (≈10 nm) into macroporous carbon nanofibers with a facile electrospinning method. An external magnetic field makes the cobalt magnetized into nanomagnets with high spin polarization, which promote the adsorption of oxygen-intermediates and electron transfer, significantly improving the catalytic efficiency. Impressively, the half wave-potential is increased by 20 mV for ORR, and the overpotential at 10 mA cm −2 is decreased by 15 mV for OER. Compared with the commercial Pt/C+IrO 2 catalysts, the magnetic catalyzed Zn–air batteries deliver 2.5-fold of capacities and exhibit much longer durability over 155 h. The findings point out a very promising strategy of using electromagnetic induction to boost oxygen catalytic activity.
研究领域:
电化学
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材料科学
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纳米催化
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能源化学
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物理化学
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电分析化学
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功能材料
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2026
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IF 15.5
Li Fan,Tan Pengyu,Li Degui,Zhuge Xiangqun,Luo Kun,Ren Yurong,Chen Yimin,Luo Yujia,Yang Kaiwen,Lu Jianwei,Liu Dan,Lei Weiwei,Ma Aijing
The extraction of chitin/chitosan from biowaste shrimp shells involves the heavy use of strong acids and alkaline solutions, resulting in a series of decomposed amino acids in the extraction waste. Herein, we demonstrate a new strategy to grow FeNi nanoalloys encapsulated in nitrogen-doped carbon nanotubes (3FeNi-NCNTs) at a high percentage by sintering the extracted amino acids, FeCl 3 , NiCl 2 and melamine at 900 ℃ in N 2 . The FeNi-NCNT exhibits a competitive limiting current density in oxygen reduction reaction (ORR) to the commercial 20% Pt/C, with the onset potential and half-wave potential at 0.98 V and 0.84 V versus RHE. The oxygen evolution reaction (OER) performance also rivals the RuO 2 catalyst, and the overpotential (E j =10 mAcm -2 - E 1/2 ) of as low as 0.76 V, highlighting a green pathway to yield superior bifunctional catalysts at low cost. When used in zinc-air batteries (ZABs), the aqueous ZAB showed excellent cyclic and rate performance, together with the peak power density and specific capacity of 173.6 mW cm -2 and 809.9 mAh g -1 (corresponding to an energy density of XXX Wh kg -1 based on the mass of consumed zinc); and the flexible ZAB with a polyacryl-amide hydrogel electrolyte also exhibited a high peak power density of 133 mWcm -2 and a long cycle life of 140 h, superior to the reference Pt/RuO 2 -based ZABs, highlighting a sustainable biowaste upcycling of shrimp shell valorization on energy storage. Graphical
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Beibei Li,Yangyang Ren,Guichao Zhang,Chenhao Lv,Lanlan Li,Xiaojing Yang,Zunming Lu,Xinghua Zhang,Xiaofei Yu
Efficient and durable oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) bifunctional electrocatalysts are critical for the development of zinc-air battery (ZAB). Unfortunately, conventional commercial catalysts usually display selective activity in only one reaction and cannot efficiently catalyze the two reactions at the same time. In this paper, porous carbon nanosheets loaded Co 4 N (Co 4 N/PNC) were prepared by pyrolysis of SiO 2 @ZnCo-ZIF. Due to the hierarchical pore structure, large specific surface area, abundant active sites, excellent electron transfer and mass transmission, the Co 4 N/PNC obtained at 920 °C (Co 4 N/PNC-920) exhibited outstanding ORR and OER catalytic activities. Furthermore, the assembled Co 4 N/PNC-920-based rechargeable ZAB displayed a discharge power density of 170.7 mW·cm −2 , a specific capacity of 801.1 mA·hg −1 and an excellent durability, implying that Co 4 N/PNC-920 could be utilized as a bifunctional and highly active catalyst in ZABs.
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
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Huaqi Wang,Chenghong Sun,Enze Zhu,Chaoyang Shi,Jie Yu,Mingli Xu
Metal–organic framework (MOF)-derived carbon materials have emerged as important candidates in the field of catalysis because of their simple synthesis, easy construction, good conductivity, and high catalytic activity. Fe 3 C nanoparticles prepared from MOFs facilitate the catalytic activity of adjacent single atoms and exhibit powerful catalytic properties. In this work, a composite structured catalyst with Fe 3 C, Co nanoparticles, and M-N x single atoms (M = Co, Fe) was synthesized (denoted as Fe 3 C-Co-NC) by constructing Fe-doped bilayer zeolitic imidazolate frameworks (ZIFs) with a core–shell structure, which were used as bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The Fe 3 C-Co-NC catalyst exhibits superior half-wave potential ( E 1/2 = 0.89 V) and overpotential ( E j=10 = 1.67 V) and outperforms the commercial Pt/C and RuO 2 . This result can be attributed to the high specific surface area, hierarchical pore structure , and high graphitization degree of the Fe 3 C-Co-NC catalyst, especially the synergistic effect between Fe 3 C and adjacent single-atom active sites. Specifically, the Zn–air battery assembled using the Fe 3 C-Co-NC catalyst displays high peak power density (203 mW cm −2 ) and specific capacity (815 mAh g −1 ) without degradation after charge/discharge cycles for 57 h. Therefore, this work offers important insights into the design and research of high-performance ORR/OER bifunctional catalysts.
研究领域:
催化材料
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 5
·7120-7128
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IF 3.741
Menglu He,Jia Jia,Qing Sun,Weixin Zhang
SUMMARY Li-O 2 battery has attracted much attention due to its ultra-high theoretical energy density in the field of electrochemical energy storage. The introduction of efficient electrocatalyst can effectively accelerate the reaction rate of ORR and OER, so as to improve the coulomb efficiency and poor cycle stability of Li-O 2 battery. In this work, a novel hollow N-doped carbon sphere is prepared by using MOF and polystyrene as template, and act as highly efficient oxygen electrocatalyst for rechargeable Li-O 2 batteries. The hollow structure can provide enough oxygen diffusion channel, deposition and decomposition space for reduction products. N doping into the hollow carbon structure can increase the charge density of adjacent carbon atoms and enhance its catalytic activity of ORR/OER. As a result, the Li-O 2 battery using the hollow N-doped carbon sphere as air cathode exhibited an high specific capacity of 18 762 mAh/g (at a current density of 500 mA/g) and remarkable cycling stability of 212 cycles (at a current density of 500 mA/g and limited capacity of 1000 mAh/g), outperforming the carbon material with common structure. This work highlights the importance of air cathode structure and efficient catalyst, provides a new idea for the design of air cathode of Li-O 2 battery, and expands the scope of future research.
研究领域:
材料科学
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电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ruge Zhao,Baoxia Ni,Luming Wu,Pingchuan Sun,Tiehong Chen
Efficient catalysts for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR) are of paramount importance for electrochemical energy applications. Herein, a high-efficient carbon-based trifunctional electrocatalyst FeCoP/C is synthesized through a simple one-step supramolecular-assisted method, in which a supramolecular gel structure is formed by phosphoric acid and melamine to allow the efficient and homogeneous incorporation of highly active species. Experimentally, the as-obtained catalysts exhibit practical trifunctional activities in the ORR, OER, and HER. In alkaline electrolytes , requiring overpotentials of 95 and 282 mV to deliver a current density of 10 mA cm −2 for HER and OER, respectively, and presents the significantly increased alkalic ORR activity, with the half-wave potential of 0.849 V. Furthermore, the FeCoP/C also showed good integrated capabilities for Zn-air batteries. This supramolecular-assisted strategy could bring new inspiration to boost the electrocatalytic performance of transition metal-based electrocatalysts for energy conversion applications.
研究领域:
材料科学
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电化学
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能源转换
✓ 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）