DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 18
·7127-7134
·
IF 4.569
Jiuyang Yu,Haichuan Guo,Wenhui Feng,Xuyun Guo,Ye Zhu,Tiju Thomas,Chunjie Jiang,Siqi Liu,Minghui Yang
A dual-phase transition metal nitride (TMN) based Co4N–WNx system has been fabricated using nitridation of CoWO4. The interface between centrosymmetric Co4N and non-centrosymmetric WNx promotes charge carrier separation. This system also shows piezoelectric behavior. The piezoelectric property has been proved using piezoelectric force microscopy (PFM) measurements. In addition, modulating the non-centrosymmetric structure of Co4N–WNx allows a hydrogen production rate of about 262.7 μmol g−1 h−1 in pure water. We also show that the piezocatalytic hydrogen evolution efficiency is satisfactory. Co4N–WNx can also help achieve simultaneous piezocatalytic hydrogen production and RhB degradation. This work provides a novel strategy for designing efficient piezocatalytic materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
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
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xingxing Jiang,Aomei Zhang,Huan Gou,Xiang Chen,Lei Deng,Minghui Yang
Highly pathogenic bacterial infections are a major threat to human health, and the resulting drug resistance is beginning to pose a major clinical threat. To combat multidrug-resistant bacterial infections, there is an urgent need to develop antimicrobial drugs that are highly effective, environmentally friendly, and able to prevent the emergence of bacterial resistance. In this paper, Co4N nanozymes were successfully synthesized by pyrolysis of a presynthesized Co-containing metal organic framework (Co-MOF). Its peroxide and lactate oxidase activity and antimicrobial properties were investigated. Without the addition of exogenous H2O2, the nanozymes can initially generate H2O2 by catalyzing lactic acid and then produce highly active •OH from H2O2. This approach overcomes the obstacle of insufficient H2O2 to achieve a satisfactory antimicrobial effect. Furthermore, the local high temperature generated by Co4N under 808 nm laser irradiation further enhanced the antibacterial effect. These results showed that the nanozyme possesses broad-spectrum antimicrobial activity against Escherichia coli and Staphylococcus aureus, with an inhibition rate as high as 99% within 2 h. Meanwhile, the enzyme has good biocompatibility, paving a way for the application of MOF materials in biomedical fields.
研究领域:
生物医学
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材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Zihao Cui,Xizhuang Liang,Peng Wang,Peng Zhou,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
Developing highly efficient and stable electrocatalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is critical for overall water splitting to solve the shortage of fossil fuel and environment pollution, but it is full of obstacles and challenges. Fe 3 N@Co 4 N@CoFe alloy nanoparticles were prepared by using an in situ coupling method. The obtained catalyst showed a satisfactory OER performance in alkaline solution with a low overpotential of 225 mV at 10 mA cm −2 current density and a small Tafel slope of 48 mV/dec. Meanwhile, the HER performance was also improved in alkaline solution after cyclic voltammetry (CV) cycles of OER due to the formation of CoFe oxyhydroxides, which required an overpotential of 135 mV to achieve 10 mA cm −2 current density and a Tafel slope of 109 mV/dec. More importantly, the obtained Fe 3 N@Co 4 N@CoFe alloy electrode and Fe 3 N@Co 4 N@CoFe alloy-CV electrode (treated through CV cycles of OER) were used as anode and cathode to assemble a two-electrode system for overall water splitting. The constructed system displayed an impressive competency with a voltage of 1.59 V at 10 mA cm −2 current density. The prepared electrocatalysts demonstrated superb long-term stability under 50 mA cm −2 current density for OER, HER and overall water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Baojin Chen,Muhammad Humayun,Yadong Li,Huaming Zhang,Huachuan Sun,Ying Wu,Chundong Wang
Exploration of highly efficient bifunctional electrocatalysts for optimal hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has been widely carried out, though it still remains a big challenge. Herein, a hierarchical CoO–Co4N@NiFe-LDH (layered-double-hydroxides) heterostructure electrode anchored on nickel foam (NF) is prepared via a developed three-step hydrothermal–nitridation–electrodeposition pathway. The fabricated CoO–Co4N@NiFe-LDH/NF electrode needs low overpotential values of 66 and 231 mV to supply a current density value of 10 mA cm–2 in aqueous solution of KOH (1 M) for HER and OER, respectively. The Tafel slopes and electrochemical impedance spectroscopy results display favorable reaction kinetics throughout the electrolysis process. Subsequently, an alkaline electrolyzer is assembled with CoO–Co4N@NiFe-LDH/NF, which serves both as the anode and cathode, yielding 10 mA cm–2 with a small voltage of 1.529 V and showing a robust stability for 28 h. Impressively, a urine-mediated electrolysis cell shows efficient catalytic activity as well, allowing to mount the sluggish OER during water splitting. To drive the urine-mediated electrolysis cell containing 0.33 M urea, a low voltage of 1.393 V is required, which is about 136 mV lower compared to the urea-free electrolysis cell. This work presents a solid step for the electrocatalytic generation of hydrogen through water splitting by harvesting low energy.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Nannan Wang,Bonan Hao,Hao Chen,Rongkang Zheng,Baojie Chen,Shihong Kuang,Xiaodong Chen,Lifeng Cui
Developing a cost-effective, efficient, and facile prepared electrocatalyst for oxygen reduction (ORR) and evolution reaction (OER) is critical for a range of renewable energy technologies. Herein, we report unique Co 4 N nanoparticles loading on g-C 3 N 4 nanotubes (Co 4 N@CNNT) bifunctional electrocatalyst for OER and ORR by an in-situ method. Highly dispersed Co 4 N nanoparticles as the active sites gather at the top of the g-C 3 N 4 nanotube (CNNT), while the six-fold cavities from smooth CNNT with an outer diameter of 48 nm and an inner diameter of 22 nm act as anchor sites to preferentially coordinate with the active sites. Benefiting from the distinctive structure features, the intrinsic metallic Co 4 N@CNNT exhibits high electrocatalytic performances. Electrochemistry studies show that an onset potential of 0.94 V and a half-wave potential of 0.86 V of Co 4 N@CNNT are obtained that are superior to Pt/C catalyst. A low overpotential of 285 mV at an anodic current density of 10 mA cm −2 during the OER process is obtained that is superior to the IrO 2 catalyst; and lower Tafel plot and good durability are also observed. Our findings provide a new strategy for the fabrication of an efficient bifunctional electrocatalyst for OER and ORR.
研究领域:
材料科学
·
电化学
·
可再生能源技术
✓ 已验证
DOI
高影响因子
NPG Asia Materials
·
2021
·Vol. 13
·期 1
·1-14
·
IF 10.481
Cao Bo,Hu Minghao,Cheng Yan,Jing Peng,Liu Baocang,Zhou Bo,Wang Xi,Gao Rui,Sun Xiaolei,Du Yaping,Zhang Jun
A 3D self-supported integrated electrode, consisting of heteroatomic nitrogen-doped carbon nanotube arrays on carbon cloth with confined ultrafine Co 4 N nanoparticles and a distribution of anchored single-atom Co, is fabricated via a cobalt-catalyzed growth strategy using dicyandiamide as the nitrogen and carbon source and a layered cobalt hydroxide-nitrate salt as the precursor. The abundance of exposed active sites, namely, the Co 4 N nanoparticles, single-atom Co, and heteroatomic N-doped carbon nanotubes, and multiple synergistic effects among these components provide suitable tailoring of the d -band center for facilitating vectorial electron transfer and efficient electrocatalysis. Benefiting from the merits of its structural features and electronic configuration, the prepared electrode exhibits robust performance toward the hydrogen evolution reaction with overpotentials of only 78 and 86 mV at 10 mA cm −2 in acidic and basic electrolytes, respectively. Density functional theory calculations and X-ray photoelectron spectroscopy valence band measurements reveal that the effective tailoring of the d -band center by Co 4 N nanoparticles plays a crucial role in optimizing the hydrogen adsorption free energy to a more thermoneutral value for efficient electrocatalysis.
研究领域:
材料科学
·
电催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2022
·
IF 7.244
Wenhua Li,Shule Zhang,Fengye Guo,Run Yu,Qianqiao Chen,Qin Zhong
Designing and constructing a delicate structure is an effective strategy to ensure the electrocatalytic stability of catalysts with excellent performance in quantum dot sensitized solar cells (QDSSCs) but remains challenging. Herein, ultrafine Co 4 N nanoparticles are encapsulated in a fish-scale-like N-doped carbon framework (Co 4 N@NC) in the form of Co–N–C bonds via a facile three-step method, including precursor construction, calcined carbonization and nitridation process. Notably, in the exquisite precursor construction process , the gelatinous chitosan induced by citric acid effectively bonds Co(Ⅱ) ions, and a fish-scale-like structure is designed under the action of template F127. The construction of this composite structure can increase contact with the electrolyte, favor electron conduction between particles, and improve the stability of the catalyst, thereby dramatically boosting the polysulfide reduction performance for QDSSCs. Co 4 N@NC is employed as the counter electrode (CE) of QDSSCs for the first time, its charge transfer resistance ( R ct ) is as low as 1.12Ω, and the power conversion efficiency of CdS/CdSe QDSSC reaches 5.54%, confirming extraordinary reduction activity towards S n 2− . Especially, compared with Co 4 N CE, Co 4 N@NC CE has better tolerance to polysulfide electrolytes and shows excellent electrochemical stability. This work provides a new strategy to improve the performance and stability of Co 4 N for the polysulfide reduction reaction.
研究领域:
材料科学
·
电化学
·
可再生能源
·
太阳能电池
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chengming Long,Sirui Liu,Di Wang,Zhaoqi Lu,Qiulan Zhang,Qiong Gao,Mingyi Zhang,Xinzhi Ma
Photoelectrochemical hydrogen production technology holds promise for directly and swiftly generating green hydrogen, which is pivotal for human welfare; however, it faces challenges posed by the energetically sluggish oxygen evolution reaction (OER). Cobalt-based nitrides are considered excellent photoelectrochemically active in the OER (PEOER) catalysts, and their conductivity and photoconversion efficiency remain relatively low. This paper presents the fabrication of Ni-alloyed Co4N nanowire arrays on carbon cloth ((Co1–xNix)4N NWAs/CC) as PEOER catalysts. By analyzing advanced in situ Raman and X-ray photoelectron spectroscopy (XPS) results, we discovered that Ni not only enhances the conductivity of the catalyst but, more importantly, also creates more photoexcited Co2+ OER centers and favors its reconstruction to CoOOH to charge PEOER. Furthermore, nitrogen plays a critical role in transforming pyridinic nitrogen into other forms of nitrogen to stabilize the catalyst’s structure. These advantages endow (Co0.74Ni0.26)4N NWAs/CC with remarkable PEOER enhancement (988%), which drives the standard current density of 10 mA cm–2 with only a 283 mV overpotential along with good durability. This research provides insights into the PEOER mechanisms of cobalt-based transition metal nitrides, providing a way for designing next-generation PEOER catalysts.
研究领域:
材料科学
·
催化化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 22
·2107417
·
IF 15.153
Shuyan Guan,Yanyan Liu,Huanhuan Zhang,Huijuan Wei,Tao Liu,Xianli Wu,Hao Wen,Ruofan Shen,Sehrish Mehdi,Xianghong Ge,Chengming Wang,Baozhong Liu,Erjun Liang,Yanping Fan,Baojun Li
The rational design of the interface structure between nitride and oxide using the same metallic element and correlating the interfacial active center with a determined catalytic mechanism remain challenging. Herein, a Co 4 N-Co 3 O 4 interface structure is designed to determine the effect of interfacial active centers on hydrogen generation from ammonia borane. An unparalleled catalytic activity toward H 2 production with a turnover frequency up to 79 min −1 is achieved on Co 4 N-Co 3 O 4 @C catalyst for ten recycles. Experimental analyses and theoretical simulation suggest that the atomic interface-exciting effect (AieE) is responsible for the high catalytic activity. The Co 4 N-Co 3 O 4 interface facilitates the targeted adsorption and activation of NH 3 BH 3 and H 2 O molecules to generate H * and H 2 . The two active centers of Co (N) * and Co (O) * at the Co 4 N-Co 3 O 4 interface activate NH 3 BH 3 and H 2 O, respectively. This proof-of-concept research on AieE provides important insights regarding the design of heterogeneous catalysts and promotes the development of the nature and regulation of energy chemical conversion.
研究领域:
材料科学
·
催化
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Siqi Liu,Wandi Kuang,Xiangjian Meng,Weiliang Qi,Samira Adimi,Haichuan Guo,Xuyun Guo,Erum Pervaiz,Ye Zhu,Dongfeng Xue,Minghui Yang
Low solar-to-fuel conversion in conventional semiconductor-based photocatalysts limits their commercial applications. Searching for highly efficient cost-effective co-catalysts is desirable for the development of artificial photosynthesis systems. In this work, we report a simple yet efficient electrostatic self-assembly process to synthesize one-dimensional Co 4 N-WN x -CdS composites for visible light-driven hydrogen evolution in pure water. Biphasic transition metal nitrides Co 4 N-WN x with high conductivity and enriched active sites leads to multi-level electrons transfer and lower over-potential for hydrogen production. Co 4 N-WN x -CdS composite, with optimized wt%, exhibits the highest rate of photocatalytic hydrogen evolution (14.42 mmol g −1 h −1 ) under vacuum condition. This rate is ~ 8 times higher than that of the Pt-CdS composite (1.78 mmol g −1 h −1 ).
研究领域:
材料科学
·
光化学
✓ 已验证
DOI
高影响因子
Journal of Analysis and Testing
·
2025
·
IF 7
Chen Lu,Shao Rong,Bao Chengqi,Deng Lei,Yang Minghui,Li Xiaoqing
The preparation of a sensitive electrochemical biosensor for lactate determination, devoid of lactate enzyme, is achieved through the integration of cobalt nitride and reduced graphene oxide nanosheets. The sensing platform comprises porous cobalt nitride with lactate oxidase mimic activity for efficient lactate oxidation. The incorporation of reduced graphene oxide nanosheets with a large surface area and high electron-transfer rate enhances the response current. The electrochemical biosensor exhibits good sensing performance for lactate in a neutral solution, which has a linear detection range of 1–80 mM with a detection limit of 0.51 mM via differential pulse voltammetry (DPV) measurement. Notably, the sensing platform also shows good stability and selectivity and was successfully applied to determine lactate in human serum samples.
研究领域:
生物传感技术
·
材料科学
·
分析化学
✓ 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）