JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 33
·期 5
·590-600
·
IF 1.673
Jie Yin,Liang Shen,Yuxuan Li,Min Lu,Ke Sun,Pinxian Xi
The transition metal compound catalysts have been taken a great part in renewable energy conversion and storage systems. Herein, we report the uniform CoFe2O4 nanoparticles with abundant oxygen vacancies and specific active surface exposed through the simple hydrothermal reaction for improving the electrocatalytic performance and stability. They show good electrocatalytic performance for hydrogen evolution reaction in 0.5 M H2SO4 with an onset potential of 20 mV, the overpotential of 45 mV (at j = 10 mA/cm2), and remarkable long-term stability more than 100 h at different current densities and better oxygen reduction reaction activity with lower overpotential in 0.1 M KOH. Moreover, the home-made primary Zn–air batteries, using CoFe2O4 nanoparticles as an air–cathode display the high open-circuit voltage of 1.47 V and the maximum power density of 142 mW/cm2. The two-series-connected batteries fabricated by CoFe2O4 nanoparticles can support a light-emitting diode to work for more than 48 h.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiapeng Wang,Xinpeng Chen,Hua-Bin Yuan,Lili Xing,Desheng Sha,Aijing Li,Guoqiang Chen,Tieling Xing
Metal-organic frameworks (MOFs) find wide-ranging applications owing to their adjustable structures, diverse compositions, and large specific surface area. In this work, MOFs materials were grown in situ on carbon cloth, yielding self-supported electrodes V O -(Fe,Co) 3 O 4 @CC rich in oxygen vacancies through a simple high-temperature annealing treatment utilizing NaBH 4 as an etchant. Thus the resulting self-supported electrode V O -(Fe,Co) 3 O 4 @CC exhibited excellent oxygen evolution reaction (OER) performance, achieving an overpotential of merely 288 mV at 10 mA cm −2 , along with a low Tafel slope of 31.39 mV dec -1 , and demonstrating robust long-term activity and stability. In addition, a liquid zinc-air battery was assembled utilizing the prepared V O -(Fe,Co) 3 O 4 @CC as an air cathode, achieving a high open-circuit voltage of 1.46 V and a high peak power density of 89.06 mW cm −2 , and it maintained excellent cycling stability during cyclic charging and discharging (with a current density of 2 mA cm −2 ) over a 32 h period. Meanwhile, the self-supported electrode V O -(Fe,Co) 3 O 4 @CC served as an air cathode for assembling an all-solid-state flexible zinc-air battery (ZAB), demonstrating a high peak power density (38.21 mW cm −2 ) and exhibiting favorable cycling stability. This experiment offers insights into the potential application of MOF-derived electrocatalysts in water decomposition and zinc-air batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Wangyi Chen,Jing Wu,Zhongyu Li,Yu Chen,Huaisheng Ao,Xudong Zheng,Yuzhe Zhang,Jian Rong,Fengxian Qiu
Designing and fabricating efficient and stable nonprecious metal-based oxygen reduction reaction (ORR) electrocatalysts is a pressing and challenging task for the pursuit of sustainable new energy devices. Herein, porous P–CoSe2@NC electrocatalysts with high-density carbon-coated CoSe2 sites were successfully fabricated based on a pyridyl-porphyrinic metal–organic framework (Co-TPyP MOF) via a molten salt-assisted synthesis method. The hierarchical pore and N-doping carbon substrate of P–CoSe2@NC promotes mass transfer and electron-transfer efficiency, which is beneficial to maximize CoSe2 site utilization. Well-designed P–CoSe2@NC exhibits efficient ORR catalytic activity with a high half-wave potential of 0.863 V and excellent catalytic stability. Meanwhile, rechargeable aqueous primary/quasi-solid-state ZABs based on a P–CoSe2@NC air cathode show a high peak power density and exceptional operating stability, catering to the demands of practical applications. The qualified performance and structure stability of the electrocatalytic system may be mainly attributed to the protection of the CoSe2 nanoparticle by the coated carbon layer. Given the rational design of the structure and the component of the electrocatalyst with enhanced ORR activity, we believe that this work has provided a reliable pathway to the development of high-performance transition-metal chalcogenides for energy-storage and -conversion devices.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Li Xu,Daijie Deng,Yuhui Tian,Hongping Li,Junchao Qian,Jianchun Wu,Henan Li
The sluggish kinetics of oxygen reduction reaction (ORR) is the bottleneck for practical applications of zinc-air batteries (ZABs). Developing highly efficient ORR electrocatalysts is of the essence for large-scale applications of ZABs. Herein, we design and synthesize the CoN x /Zn, N co-doped porous carbon structure (CoN x /Zn-NC) by self-polymerization of biomass materials and coupling of nitrogen-rich species with metallic ions. The introduced zinc element can regulate electronic structures of electrocatalysts and construct bimetallic active sites (N-Co/N-Zn species), facilitating the adsorption of reaction intermediates and further enhancing electrocatalytic performance. The porous carbon structure obtained by the self-polymerization of locust bean gum not only disperses active sites but also improves the O 2 and electron transfer efficiency of electrocatalysts. The CoN x /Zn-NC exhibited excellent ORR electrocatalytic performance (E 1/2 = 0.85 V) as well as outstanding stability. Impressively, the ZABs assembled with CoN x /Zn-NC demonstrated a high maximum power density, specific capacitance, and excellent charge/discharge cycling stability for 115 h, surpassing Pt/C catalyst.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 14
·3383-3393
·
IF 6.813
Jiawei Wei,Ping Li,Jing Shi,Minghua Huang,Weiqian Tian,Huanlei Wang
Designing high-performance carbon-based oxygen reduction catalysts using a facile strategy is an attractive research direction in the field of energy conversion and storage. Herein, N/S co-doped carbon was prepared using κ-carrageenan and melamine as precursors, in which melamine can be decomposed into nitrogen-containing gas for realizing nitrogen doping, and the sulfate groups in κ-carrageenan can be converted for sulfur doping. Such an N/S doping strategy enables a carbon catalyst with a large specific surface area, hierarchical porous structure, and rich defective sites to be achieved, displaying a high positive onset potential (Eonset = 0.98 V) and half wave potential (E1/2 = 0.89 V), excellent stability, and methanol tolerance. More importantly, S doping could increase the positive charge density of the carbon adjacent to the nitrogen, which is favorable for enhancing the chemisorption of O2 and weakening the O–O bond, thereby promoting the reaction from O2 to OH− and improving electron transfer. Furthermore, with this catalyst as the air cathode, the assembled aqueous Zn–air battery exhibits a high open-circuit potential of 1.53 V and a remarkable peak power density of 166.05 mW cm−2, outperforming the Pt/C catalyst. This work gives a facile and effective strategy to construct high-performance ORR catalysts with four electron transfer for Zn–air batteries.
研究领域:
能源材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Xue Zhao,Xue Li,Zenghui Bi,Yuwen Wang,Haibo Zhang,Xiaohai Zhou,Quan Wang,Yingtang Zhou,Huaisheng Wang,Guangzhi Hu
The biggest challenge is to develop a low cost and readily available catalyst to replace expensive commercial Pt/C for efficient electrochemical oxygen reduction reaction (ORR). In this research, closo -[B 12 H 12 ] 2− and 1,10-phenanthroline-iron complexes were introduced into the porous metal-organic framework by impregnation method, and further annealing treatment achieved the successful anchoring of single-atom-Fe in B-doped CN Matrix (FeN4CB). The ORR activity of FeN4CB is comparable to the widely used commercial 20 wt% Pt/C. Where the half-wave potential ( E 1/2 ) in alkaline medium up to 0.84 V, and even in the face of challenging ORR in acidic medium, the E 1/2 of ORR driven by FeN4CB is still as high as 0.81 V. When FeN4CB was used as air cathode, the open circuit voltage of Zn-air battery reaches 1.435 V, and the power density and specific capacity are as high as 177 mW cm −2 and 800 mAh g Zn −1 (theoretical value: 820 mAh g Zn −1 ), respectively. The dazzling point of FeN4CB also appears in the high ORR stability, whether in alkaline or acidic media, E 1/2 and limiting current density are still close to the initial value after 5000 times cycles. After continuously running the charge-discharge test for 220 h, the charge voltage and discharge voltage of the rechargeable zinc-air battery with FeN4CB as the air cathode maintained the initial state. Density functional theory calculations reveals that introducing B atom to Fe–N4–C can adjust the electronic structure to easily break O = O bond and significantly reduce the energy barrier of the rate-determining step resulting in an improved ORR activity.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xinmeng Yu,Xiaorong Chen,Dandan Yue,Fenghua Zheng,Qingyu Li,Zhaoling Ma,Hongqiang Wang
Aiming to achieve high-efficiency bifunctional catalysts, doping engineering is applied to construct bifunctional catalysts for oxygen electrodes in Zn-air batteries to strengthen the catalytic kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, MnS doped cobalt nitride catalyst (MnS/CoN x ) with divergent fiber morphology is prepared by low temperature nitriding for the self-assembling layered double hydroxides (LDH). The MnS/CoN x shows excellent electrical conductivity and improved catalytic activity on ORR and OER with low overpotential of 290 mV at 10 mA cm −2 and a good half-wave potential of 0.80 V in ORR compared with CoNx and MnO/CoN x . The contribution of the increased bifunctional catalytic performance is possible from the more active center Co 3+ and Mn 4+ , and the elevated electron transport resulted from the opportune high conductive MnS doping. The MnS/CoN x catalyst-driven Zn-air battery achieves a higher power density of 228 mW cm −2 and the excellent long-term stability of 500 h at 20 mA cm −2 far surpassing the commercial Pt/C+RuO 2 catalyst.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 13
·135601
·
IF 2.9
Yifan Yuan,Hongyou Chen,Liangkui Peng,Yingqi Liu,Jin Zou,Lu Cheng,Ying Wang,Xin Xia,Huimin Zhou
Flexible solid-state zinc–air batteries as a wearable energy storage device with great potential, and their separators, which control ion permeability, inhibit zinc dendrite generation, and regulate catalytic active sites, have been developed as gel electrolyte separators with high retention of electrolyte uptake. However, the gel electrolyte separator still has problems such as poor affinity with the electrolyte and poor ionic conductivity, which limits its further application. In order to further improve the electrolyte absorption, ionic conductivity and mechanical strength of cellulose acetate(CA)/polyvinyl alcohol (PVA) nanofibers, TiO2 was added to CA/PVA to increase the porosity, and glutaraldehyde (GA) was used to modify the CA/PVA/TiO2 separator by acetal reaction with CA and PVA to make the molecules closely linked. The results shows that the optimal mass fractions of TiO2 and GA were 2% and 5%, respectively. At this time, the porosity and absorption rate of the separator increased from 48% to 68.2% and 142.4% to 285.3%, respectively. The discharge capacity reached 179 mA cm−3, and the cycle stability rate was 89% after 7 stable constant current charge/discharge cycles.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
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
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2024
·Vol. 8
·期 9
·2050-2058
·
IF 5
Lilai Liu,Youzheng Wu,Hui Wang,Xueying Yang,Weirun Zhu,Shuanshuan Ma,Xiangyu Lu,Yaqiang Li,Penghui Ren,Peixia Yang,Ruopeng Li
The construction of pore structures at different scales (atomic defect and molecular porous structures) is the most promising method to achieve excellent ORR catalytic activity for carbon-based catalysts. As a proof of concept, a graphitic nitride-doped carbon substrate was chosen as the research model in this study, and we fabricated a delicate pore-edge graphitic-nitride configuration (labeled as P N-C) with hierarchical porosity and abundant vacancy defects via a SiO2-protected shell-mediated template approach. The hole edge carbon defects in the derived porous carbon expose efficient active sites and modulate the electronic environment to be favorable for catalyzing oxygen reduction, while the enriched porosity facilitates charge transfer. All of these features enable considerable catalytic performance, with a half-wave potential of 0.842 V and high extreme current density under alkaline conditions. As expected, the P N-C applied as a cathode in liquid zinc–air batteries (ZABs) delivers a high specific capacity of 779.4 mA h g Zn−1 at 20 mA cm−2, with satisfactory operating stability, proving its practical feasibility. This study highlights that the rational engineering of pore structures is key to achieve kinetic promotion in carbon-based ORR catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yujia Wei,Yongfa Huang,Yike Pi,Wu Yang,Liping Wu,Yuling Luo,Zehong Chen,Yongkang Chen,Ge Shi,Xiao Chi,Xinwen Peng
Cellulose nanofiber (CNF) is an environmentally friendly material with a high specific surface area, which is an ideal candidate for cathode catalysts in zinc–air batteries (ZABs). However, untreated CNF-based carbon materials suffer from low intrinsic activity and fewer micro-mesopores. Herein, we developed an N-doped porous carbon aerogel from CNF and graphite phase carbon nitride (g-C3N4) via hydrothermal pretreatment and the carbonization process. The CNF can serve as the skeleton of the aerogel that leads to an interconnected porous structure, while g-C3N4 guarantees the in situ N doping and the formation of more nanopores. Therefore, the as-prepared carbon aerogel exhibits excellent oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performances owing to the successful N doping with sufficient graphite-N and pyridine-N active sites (69.1%) and high specific surface areas (785.4 m2 g−1). The assembled ZABs with a carbon aerogel deliver a specific capacity of 790 mA h g−1 and an energy density of 945.6 W h kg−1 with a long-term stability over 100 h. This work opens a new avenue for the effective conversion of abundant biomass into bifunctional air cathodes for energy-related applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2024
·Vol. 6
·期 9
·e535
·
IF 19.5
Zhimin Niu,Yan Gao,Tianhui Wu,Fei Zhang,Ran Zhao,Zijia Chen,Yiming Yuan,Tifeng Jiao,Jianmin Gu,Li Lu,Desong Wang
Rechargeable neutral aqueous zinc−air batteries (ZABs) are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs. However, the neutral ZABs normally possess poor oxygen evolution reactions (OERs) and oxygen reduction reactions performance, resulting in a large charge–discharge voltage gap and low round-trip efficiency. Herein, we demonstrate a sunlight-assisted strategy for achieving an ultralow voltage gap of 0.05 V in neutral ZABs by using the FeOOH-decorated BiVO 4 (Fe-BiVO 4 ) as an oxygen catalyst. Under sunlight, the electrons move from the valence band (VB) of Fe-BiVO 4 to the conduction band producing holes in VB to promote the OER process and hence reduce the overpotential. Meanwhile, the photopotential generated by the Fe-BiVO 4 compensates a part of the charging potential of neutral ZABs. Accordingly, the energy loss of the battery could be compensated via solar energy, leading to a record-low gap of 0.05 V between the charge and discharge voltage with a high round-trip efficiency of 94%. This work offers a simple but efficient pathway for solar-energy utilization in storage devices, further guiding the design of high energy efficiency of neutral aqueous ZABs.
研究领域:
材料科学
·
能源存储技术
·
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）