CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Long Zeng,Lu An,Zhijie Zhang,Jie Zheng,Wenxuan Chen,Chao Liu,Yuying Zheng,Dai Dang,Zhao-Qing Liu
Development of non-noble bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are of great significance under alkaline electrolytes for overall water splitting. In this work, CoP/FeP has been designed and constructed in situ on carbon fiber paper by using the bimetallic metal organic frameworks (MOFs) synthesis strategy. The heterogeneous CoP/FeP displays excellent catalytic activities in both HER and OER of the fully hydrolyzed semi-reaction. Remarkably, CoP/FeP is applied as the bifunctional electrode in anode and cathode to construct an overall water splitting apparatus, resulting in the low cell voltage and excellent stability. The exceptional electrocatalytic performance may be mainly attributed to the heterogeneous interface, which constructs a built-in electric field to provide electron to Co with electron-rich structure, resulting in the strong adsorption of H and weak adsorption of O 2 on Co. This study provides an effective and controllable method for the design of self-supporting bimetal phosphide 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
FUEL
·
2022
·
IF 8.035
Zhihui Ma,Haitao Wang,Hanyu Ma,Sihui Zhan,Qixing Zhou
The electrochemical urea oxidation (UOR) involves the generation of gases bubbles, which often cause the blockage of the electrode surface leading to decline activity. Herein, we report the growth of Ni 5 P 4 nanosheets on nickel foam as bifunctional electrode (CA-Ni 5 P 4 @NiO x /NF) for urea electrolysis. The results indicated that a thin layer of amorphous NiOx formed on the surface of Ni 5 P 4 nanosheets to yield a unique crystalline@amorphous core–shell structure, which can be maintained during long time urea electrolysis. The outstanding UOR performance of CA-Ni 5 P 4 @NiO x /NF was attributed to the unique structure, which not only combine the good conductivity and abundant active sites, but also rendered the CA-Ni 5 P 4 @NiO x /NF superhydrophilic and aerophobic that significantly facilities the release of gases bubbles formed during UOR to avoid the blockage of the active sites. As a result, the CA-Ni 5 P 4 @NiO x /NF electrode exhibited excellent performance for UOR, which only needs 1.45 V (vs. RHE) to deliver a current of 100 mA/cm 2 . When used as anode for direct urea fuel cell (DUFC), it could reach a maximal power density as high as 3.4 mW/cm 2 with an OCV of 0.76 V. The CA-Ni 5 P 4 @NiO x /NF also exhibited excellent activity for hydrogen evolution reaction (HER), with -0.089 V (vs. RHE) to deliver a current of 10 mA/cm 2 . The electrolyzer constructed with CA-Ni 5 P 4 @NiO x as both anode and cathode could run for more than 10 h at a high current load about 100 mA/cm 2 without appreciable potential change, indicating the superb stability of the CA-Ni 5 P 4 @NiO x electrode. Our work provides new insights for understanding as well as the development of advanced electrode for DUFC and urea electrolysis.
研究领域:
材料科学
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电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Enhao Zhang,Sisi Yao,Xiaoxuan Guo,Xinyi Zhou,Yutai Li,Feifan Xie,Yonghang Wei,Dongjiang Yang,Jin Sun,Yun Lu
The advancement of highly efficient bifunctional electrodes tailored for water electrolysis, specifically targeting the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), is pivotal for sustainable hydrogen production. However, sluggish reaction kinetics and elevated overpotentials pose formidable hurdles. In this study, an innovative strategy is introduced by integrating Fe@ZIF-67 onto self-supporting carbonized rattan stem (CR), leveraging its distinctive through-channel macroporous architecture to bolster catalytic efficacy. The self-supporting CR substrate not only enhances mass transport but also facilitates uniform deposition of ZIF-67, ensuring optimal exposure of active sites. A comparative analysis with carbonized basswood (CW) underscores the superior performance of the macroporous CR substrate in augmenting both OER and HER activities. Notably, the Fe@ZIF-CR self-supported electrode achieves an overpotential of 208 mV at 10 mA cm⁻² for oxygen evolution and 317 mV at 100 mA cm⁻² for hydrogen evolution. Additionally, the self-supporting nature of the CR substrate guarantees long-term stability and mitigates catalyst loss during operation. These findings underscore the synergistic advantages of the macroporous structure and ZIF-67 active sites, offering fresh perspectives on the utilization of biomass-derived carbon materials in sustainable energy technologies.
研究领域:
材料科学
·
可再生能源
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2021
·Vol. 5
·期 2
·543-554
·
IF 15.122
Yu Ma,Ding Chen,Weijun Li,Yapeng Zheng,Lin Wang,Gang Shao,Qiao Liu,Weiyou Yang
The design of efficient cathode with great cycle performance, high flexibility, and low cost is essential for the commercialization of zinc–air battery (ZAB). Herein, we report the exploration of freestanding bifunctional cathode with rationally designed structures, namely, tiny Co nanoparticles embedded in N-doped carbon nanofiber aerogels, which have desired features including uniform Co dispersity, balanced distribution of N-C species, hierarchically porous structure with increased fraction of meso- to micropores, and moderate amounts of defects. Accordingly, the as-fabricated cathodes exhibit positive half-wave potential of 0.82 V for oxygen reduction and small overpotential of 350 mV at 10 mA cm −2 for oxygen evolution, respectively, which deliver smaller reversible oxygen electrode index (0.76 V) than the commercial Pt/C+RuO 2 (0.80 V) and most Co-based electrocatalysts ever reported. Impressively, the as-constructed liquid rechargeable ZAB behaves high peak power density (160 mW cm −2 ), large specific capacity (759.7 mAh g −1 at 10 mA cm −2 , tested after 120 h of OCV tests), and robust stability over 277 h. Moreover, the as-assembled quasi-solid-state ZAB using such freestanding cathode represents excellent mechanical flexibility and outstanding cycle performance, regardless of being serviced under extremely bending conditions from 0° to 180°, underscoring their promising applications as durable bifunctional cathode for portable metal–air batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yi-Fan Jiang,Cheng-Zong Yuan,Xiao Zhou,Ya-Nan Liu,Zhi-Wei Zhao,Sheng-Jie Zhao,An-Wu Xu
The design of inexpensive, efficient, durable and self-supported bifunctional electrodes for simultaneously catalyzing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte is essential for renewable energy conversion processes and future sustainable development, however, it still remains a challenging issue. Reported herein is the first example of selenium phosphorus co-doped cobalt oxide nanosheets on highly conductive Co foil collector (CoOSeP@Co foil), fabricated by successively selenylation and phosphorization of a pre-oxidized Co foil, as a novel bifunctional electrode for water electrolysis. Due to the improved intrinsic catalytic activity of cobalt oxide derived from doping and the strong interaction between active CoOSeP nanosheets and highly conductive Co foil collector, the designed CoOSeP@Co foil integrated electrode displays favorable catalytic activities towards both HER and OER in strongly alkaline media, achieving an electrocatalytic current density of 10 mA cm −2 at a low overpotential of 155 mV for HER and 347 mV for OER, respectively. Beyond that, the electrode could keep working and maintain its catalytic activity for at least 30 h. Furthermore, an alkaline electrolyzer constructed by employing CoOSeP@Co foil as an integrated bifunctional electrode in both the cathode and anode can generate 10 mA cm −2 at a cell voltage of 1.74 V and shows good long-term stability of more than 30 h. This work not only opens a new avenue to improve the intrinsic catalytic activity of materials by co-doping with heteroatoms , but also brings us a new idea for designing other cost-effective, self-supported, efficient and robust overall water splitting electrodes.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chuntian Tan,Feihong Wang,Kai Lv,Yangyang Shi,Binbin Dong,Luyuan Hao,Liangjun Yin,Xin Xu,Yuxi Xian,Simeon Agathopoulos
Developing a highly efficient, cost-effective, and stable bifunctional electrode for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is still a major challenge. This work reports on a novel method for fabricating TiN ceramic membrane supported nitrogen-incorporating NiCo 2 nanowires (NiCo 2 -N/TiN) as a bifunctional electrode. Owing to its unique structure, the ample reaction sites available, and the enhanced mass/charge transport ability, the NiCo 2 -N/TiN electrode exhibits efficient catalytic performance both in HER and OER, with overpotentials of 131 mV at 20 mA·cm −2 for HER and 330 mV at 20 mA·cm −2 for OER, together with excellent stability in alkaline solution. The NiCo 2 -N/TiN electrode only requires a cell voltage of 1.71 V to drive the current density of 20 mA·cm −2 for overall water splitting, which exhibits excellent stability for more than 100000 s. Accordingly, the produced ceramic membrane electrode has a great potential for application in industrial hydrogen production.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yaoxing Wang,Ying Shang,Zhifeng Cao,Kaizhu Zeng,Yanjun Xie,Jian Li,Yonggang Yao,Wentao Gan
Various strategies have been used to improve the performance of non-noble catalysts, such as alloying, doping, and fine structure modulations. Herein, we reported a magnetic field-enhanced, bifunctional Ni 3 Fe/wood carbon electrode (Ni 3 Fe-CW) for efficient overall water splitting. Wood with numerous porous channels allows high loading of metal ions via the hydrothermal method, while the following high-temperature calcination leads to well-dispersed and uniform Ni 3 Fe nanoparticles , which are both electrocatalytically and magnetically active. As a result, the Ni 3 Fe-CW shows low overpotentials of 237 mV and 76 mV at 10 mA cm −2 for both oxygen and hydrogen evolutions under magnetic field (300 mT by a permanent magnet). Density functional theory calculations demonstrate that the Ni 3 Fe exhibits strong spin polarization under magnetic field with accelerated electron transfer , leading to lower reaction energy barrier and enhanced catalytic activities . Importantly, the electrolytic cell constructed by the bifunctional Ni 3 Fe-CWs as both cathode and anode displays a low cell voltage of 1.54 V at 10 mA cm −2 with an appropriate stability over 50 h (with a passive magnet). Considering the ubiquitous application of magnetic Fe, Co, Ni in catalytic reactions and the passive-radiation role of magnet, our strategy is promising for many energy conversion technologies toward highly efficient catalysis.
研究领域:
材料科学
·
催化化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Fang Wang,Mengjuan Xu,Jinyu Ma,Yiming Li,Jiao Zhang,Zhengguo Zhang,Shixiong Min
Porous carbon membrane-based bifunctional electrodes (NixCoyP@CSA) are developed by direct carbonization followed by vapor-phase phosphidation of Ni2+/Co2+-crosslinked starch aerogel. During the carbonization and phosphidation processes, the crosslinked starch framework is transformed into a hierarchically porous, conductive, and mechancially strong carbon membrane while the Ni2+/Co2+ species are concurrently converted into embedded carbon-coated NixCoyP nanoparticles with a loading exceeding 40 wt%. Benefitting from hierarchically porous structure, excellent wettability, abundant active sites, the best NiCo2P@CSA electrode exhibits a high areal specific capacitance (Ca) of 9.41 F cm-2 at 2 mA cm-2, a volumetric capacitance (CV) of 115.0 F cm-3 at 20 mA cm-3, and a NiCo2P loading-based mass capacitance (Cm) of 1108.9 F g-1 at 0.2 A g-1, in a three-electrode system. In addition, an asymmetrical supercapacitror (SC) assembled by paring NiCo2P@CSA and activated carbon/Ni foam (AC/NF) exhibits a high Ca of 2.46 F cm-2 at 2 mA cm-2, an energy density of 0.41 mWh cm−2 at the power density of 1.1 mW cm−2, and a 75 % capacitance retention with a unit coulombic efficiency after 10000 cycles. In addition, the NiCo2P@CSA can also be directly used as a binder-free bifunctional electrode for electrocatalytic water splitting, requiring low overpotentials of 192.4 and 418.5 mV to achieve a current density of 100 mA cm-2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, and it exhibits superior durability in both HER (>100 h at 20 mA cm-2) and OER (>40 h at 20 mA cm-2).
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 10
·4104-4112
·
IF 9.8
Yunyi Yang,Ren Zou,Jianyun Gan,Yujia Wei,Zhongxin Chen,Xuehui Li,Shimelis Admassie,Yunpeng Liu,Xinwen Peng
The high overpotential of the oxygen evolution reaction (OER) and the undesirable chlorine evolution reaction (ClER) severely limit the hydrogen production efficiency of seawater electrolysis. The organic electrooxidation reactions, involving C–H bond oxidation with low bond dissociation energy in the rate-limiting step, can possess lower oxidation potential than the OER as well as prevent the ClER. Herein, we demonstrate a strategy for replacing the sluggish OER by thermodynamically favorable biomass oxidation for scaling up the electrolysis of alkaline seawater. A xylose electrooxidation reaction (XOR) holds great promise for superseding the OER in seawater electrolysis, which not only simultaneously produces valuable formic acid and hydrogen, but also improves energy utilization. By utilizing NiCoP metal phosphide as the bifunctional electrode, the XOR shows an apparent overpotential reduction of 290 mV at 100 mA cm−2 as compared with the OER in the alkaline seawater electrolyte. Furthermore, the xylose-assisted seawater electrolysis exhibits a high formic acid selectivity of at least 94.6% and a high hydrogen production rate of 150 mL cm−2. This work provides a universal and an effective pathway for hydrogen production from seawater and biomass upgrading.
研究领域:
能源化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 10
·2111
·
IF 2.8
Tong Ding,Nanheng Cen,Rui Fan,Long Li,Yonghong Du,Chun Tang,Heng Guo,Yiping Li,Zongshe Liu
The electrochemical removal of abundant and toxic H2S from highly sour reservoirs has emerged as a promising method for hydrogen production and desulfurization. Nevertheless, the ineffectiveness and instability of current electrocatalysts have impeded further utilization of H2S. In this communication, we introduce a robust array of Fe2NiSe4nanowires synthesized in situ on a FeNi3foam (Fe2NiSe4/FeNi3) via hydrothermal treatment. This array acts as an active electrocatalyst for ambient H2S splitting. It offers numerous exposed active sites and a rapid electron transport channel, significantly enhancing charge transport rates. As an electrode material, Fe2NiSe4/FeNi3displays remarkable electrocatalytic efficiency for both sulfide oxidation and hydrogen evolution reactions. This bifunctional electrode achieves efficient electrochemical H2S splitting at a low potential of 440 mV to reach a current density of 100 mA∙cm−2, with a faradaic efficiency for hydrogen production of approximately 98%. These findings highlight its significant potential for desulfurization and energy-efficient hydrogen generation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 22
·e202201047
·
IF 5.497
Kaixun Li,Yun Tong
Graphical Urea-Assisted Hydrogen Production : A kind of self-supporting Ni 2 P−Ni(OH) 2 hybrid nanosheet arrays is exploited as highly-active bifunctional electrode for urea-assisted hydrogen production in alkaline medium, which put forward a simple strategy to design novel hybrid structure for energy-saving hydrogen production. Urea oxidation reaction (UOR) is an important strategy to synergistically realize energy-saving hydrogen evolution reaction (HER) and urea-rich wastewater purification by replacing water oxidation in water electrolysis. However, the efficient realization of integral urea electrolysis remains challenging. Herein, a self-supporting Ni 2 P−Ni(OH) 2 hybrid nanosheet array on nickel foam (Ni 2 P@Ni(OH) 2 /NF) is designed by a simple hydrothermal accompanied by electrodeposition strategy, representing a new class of bifunctional electrodes for urea-assisted water electrolysis. The Ni 2 P@Ni(OH) 2 /NF reaches the current density of 100 mA cm −2 at potentials of −0.16 V and 1.388 V, along with small Tafel slopes of 69 mV dec −1 and 33 mV dec −1 for HER/UOR, respectively. For the HER||UOR coupled system, the constructed electrolyzer only needs 1.38 V to realize the current density of 100 mA cm −2 under 80 °C. The superior bifunctional activity of the Ni 2 P@Ni(OH) 2 /NF electrode is ascribed to the combined merits of the Ni 2 P@Ni(OH) 2 heterostructure, enriching the catalytic active sites and offering a faster charge transfer process for electrolysis. Our work provides important insights into the design of highly active bifunctional catalysts from the perspective of overall water electrolysis.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wene Du,Yuying Feng,Jiahui Jiang,Ting Zhao,Guancheng Xu,Li Zhang
Urea-assisted water splitting is a promising method for the production of H 2 with reduced energy consumption, which can also purify urea-rich wastewater. Nevertheless, the development of bifunctional electrocatalysts that exhibit exceptional efficiency and affordability for the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) remains a challenging task. In this work, a MOFs-derived bifunctional electrode of Co-doped Cu 2−x Se with a hollow nanorod structure assembled from nanoparticles is prepared on a copper foam substrate (Co x Cu 2−x Se/CF) by a three-step synthesis process. As anticipated, the Co x Cu 2−x Se/CF self-supported electrode shows promising performance in terms of the UOR and HER. This can be attributed to the unique hollow nanorod structure assembled from nanoparticles and incorporation of Co dopants, which can expose more active sites, enhance the electrochemical surface area, and facilitate faster reaction kinetics. When Co x Cu 2−x Se/CF was employed as the self-supported electrode for H 2 production in a coupled HER||UOR system, only 1.51 V was required to drive a current density of 10 mA cm −2 , which is 120 mV lower than the traditional water electrolysis system. And it also displays an outstanding stability, the current density retention ratio is approximately 82.1 % after 70 h. Noteworthy, XRD, XPS and in-situ Raman analysis reveal that Co x Cu 2−x Se/CF can form highly active CuO and amorphous Cu(OH) 2 as the active sites in UOR. This work proposes a strategy for H 2 production and urea-containing wastewater treatment.
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）