DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 19
·6650-6658
·
IF 4.39
Xiaoqiang Du,Jiaxin Li,Kaicheng Tong,Xiaoshuang Zhang
Exploiting environmentally friendly and robust electrocatalysts for overall water splitting is of utmost importance in order to alleviate the excessive global energy consumption and climate change. Herein, a simple phosphoselenization method was used to prepare Co2P and CoSe2 coupled nanosheet and nanoneedle composite materials on nickel foam (Co2P/CoSe2/NF). Density functional theory calculations showed that Co2P had a higher water adsorption energy compared with CoSe2, indicating that H2O molecules are strongly adsorbed on the active sites of Co2P, which speeds up the kinetic process of water splitting. The Co2P/CoSe2-300 material displayed superior electrocatalytic activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline medium. It's worth noting that the Co2P/CoSe2-300 composite material nanoarrays merely needed an ultralow overpotential of 280 mV to drive a current intensity of 100 mA cm−2 for OER. In addition, when a two-electrode system was constructed for overall water splitting, the current intensity of 20 mA cm−2 could be reached while requiring an ultrasmall cell voltage of 1.52 V, which is one of the best catalytic activities reported up to now. Experimental and density functional theory calculations showed that the superior electrocatalytic performance of Co2P/CoSe2-300 could be attributed to its higher electron-transfer rate, higher water adsorption energy, and the synergistic effect of Co2P and CoSe2. Our work provides a novel approach for the one-step construction of composite materials as environmentally friendly and inexpensive water splitting catalysts.
研究领域:
材料科学
·
能源化学
·
计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Ying Liu,Fei Yang,Wei Qin,Guowei Yang
The Co 2 P@NiCo 2 O 4 bi-functional electrocatalyst was fabricated for hydrogen evolution reaction and oxygen evolution reaction in acidic, neutral and alkaline media. The Co 2 P@NiCo 2 O 4 in alkaline media exhibites an extremely low overpotential of 170 mV in oxygen evolution to achieve a current density of 10 mA cm −2 and produces stable water splitting nearly 30 h. The anchored-Co 2 P can enhance the electrochemical performance of pristine NiCo 2 O 4 as well as increase the tolerance in acidic media of NiCo 2 O 4 . Additional, the Co 2 P is oxidized to oxides/hydroxides species during the electrocatalytic reaction , which acts as the active centers of the electrocatalysis . The Co 2 P@NiCo 2 O 4 catalyst can be used as an effective bifunctional synergistic center in a wide range of pH values (from 0 to 14).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Xuerong Zhou,Xiang Li,Roel Prins,Jinyin Lv,Anjie Wang,Qiang Sheng
CoP and Co 2 P were prepared by temperature-programmed reduction of the mixtures of Co(OH) 2 and H 3 PO 3 with stoichiometric P/Co ratios, but their surfaces were still enriched in phosphorus. Based on the product distributions of the hydrodesulfurization (HDS) of dibenzothiophene (DBT), 1,2,3,4-tetrahydro-dibenzothiophene (TH-DBT), and 1,2,3,4,4a,9b-hexahydro-dibenzothiophene (HH-DBT), a reaction network of DBT HDS was proposed and the mechanisms of the cleavage of different C S bonds in DBT and its hydrogenated intermediates were discussed. CoP was much more active and more nitrogen-tolerant than Co 2 P, which make it a promising HDS catalyst. The HDS reactions over CoP and Co 2 P followed a pseudo-first-order kinetics and a pseudo-zero-order kinetics, respectively. Piperidine strongly inhibited the hydrogenation/dehydrogenation reactions and the direct desulfurization of DBT, but its inhibition on the desulfurization of TH-DBT and HH-DBT were less pronounced. The active surfaces of CoP and Co 2 P in HDS reactions can be cobalt phosphosulfide phases.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 13
·6394-6400
·
IF 6.97
Liangbin Liu,Lei Ge,Yuyang Sun,Binbin Jiang,Yafei Cheng,Lai Xu,Fan Liao,Zhenhui Kang,Mingwang Shao
The search for efficient, stable and low-cost electrocatalysts for water splitting is a big challenge faced by energy conversion systems. In this work, Cu3P–Co2P nanocomposites with numerous interfaces are employed as catalysts for water splitting in alkaline solution. The quasi-layer structure of Co2P and the polarized plane of Cu3P endow the nanocomposites with large surface areas and active sites, which substantially favors the intrinsic charge transfer and boosts the catalytic activity. In addition, Cu3P reduces the lattice mismatch between Co2P and nickel foam and then enhances the catalytic stability. For the optimized Cu3P·0.75Co2P catalyst, a low overpotential of 124.6 mV@−20 mA cm−2 is required with a Tafel slope of 65 mV dec−1 for the hydrogen evolution reaction (HER) and an overpotential of 334 mV (at 20 mA cm−2) is required for the oxygen evolution reaction (OER). The potential for the overall-water-splitting@10 mA cm−2 is about 1.55 V with the optimized Cu3P·0.75Co2P catalysts. Theoretical and experimental results both reveal the significance of coupling of Cu3P in the two processes of water-splitting for the Cu3P–Co2P nanocomposite catalyst.
研究领域:
材料科学
·
能源转换
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Yanxia Zeng,Xiashi Zhu,Yuheng Zhang,Songqing Chen,Wei Zhang,Lei Wang
Electrochemical water electrolysis is an efficient important way to produce hydrogen. In this work, durable and low-cost Co 2 P/CoP was synthesized by a facile one-step calcination reaction. Subsequently, Co 2 P/CoP was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microcopy (TEM), X-ray photoelectron spectra (XPS). To evaluate the electrocatalytic hydrogen evolution activity, Co 2 P/CoP was measured by electrochemical tests. Co 2 P/CoP exhibited excellent HER performance with a small overpotential of 196 mV at a current density of 10 mA cm −2 and a smaller Tafel slope of 53 mV dec −1 in alkaline media. Moreover, Co 2 P/CoP exhibited superior stability with long-term operation of 24 h.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
J. Zhu,C. Shang,X. Wang,G. Zhou
Phosphorus-based materials as the anode for sodium-ion batteries have drawn extensive attention because of their high theoretical capacity and low insertion potential. Nevertheless, the severe volume variation and low electric conductivity hindered their further practical applications. Herein, a novel Co 2 P/Sn 4 P 3 hybrid encapsulated in carbon nanocubes was fabricated by a coprecipitation method followed by phosphating progress. Accompanying with the N, P codoping and abundant grain boundaries, which facilitates electric transport and provides rich active sites, the as-synthesized Co 2 P/Sn 4 P 3 @C anode delivered a high charge specific capacity of 185.6 mA h g −1 after 400 cycles at the current density of 1000 mA g −1 and outstanding cycling stability with a high capacity retention of 86.9%. Kinetics exploration indicated that the capacity was governed by the surface pseudo-capacitive controlled process due to the abundant defects originated from heteroatom doping and grain boundaries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Ran Duan,Yejun Li,Shen Gong,Yonggang Tong,Zhou Li,Weihong Qi
The development of industrial application of water splitting demands simple and effective methods for the preparation of highly efficient electrocatalysts that are inexpensive and robust. Herein, we report a simple activation method to decorate 3D cobalt iron oxyhydroxide (CoFe-OOH) nanosheets on Co 2 P nanoparticles with Ni foams (NF) as substrates. The synthesized catalysts exhibit excellent activity for electrochemical oxygen evolution reaction due to the hierarchical heterostructures and synergistic effects of CoFe-OOH and Co 2 P. The as-prepared catalysts require a low overpotential of 199 mV to deliver 30 mA cm −2 in oxygen evolution reaction in 1 M KOH with a small Tafel slope of 39 mV dec −1 , indicating favorable kinetics during electrolysis. The synthesized catalysts are further used as cathode and anode for overall water splitting, which only requires a cell voltage of 1.60 V at a current density of 30 mA cm −2 . This work provides new insights on the preparation of efficient electrocatalysts for overall water splitting, which may have the potentials for industrial water electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Ruiqi Guo,Jialun Shi,Lan Hong,Kaiwen Ma,Wenxiang Zhu,Haiwei Yang,Jiajie Wang,Huihua Wang,Minqi Sheng
Electrocatalytic water splitting is a desirable and sustainable strategy for hydrogen production yet still faces challenges due to the sluggish kinetics and rapid deactivation of catalysts in the oxygen evolution process. Herein, we utilized the metal-catalyzed growth technology and phosphating process to fabricate self-supported electrodes (CoxPy@CNT-CC) composed of carbon nanotube (CNT) arrays grown on carbon cloth (CC); thereinto, cobalt-based phosphide nanoparticles (CoxPy) are uniformly encapsulated in the cavity of the CNTs. After further optimization, when the nanoparticles are in the composite phase (CoP2/Co2P), CoP2/Co2P@CNT-CC served as catalytic electrodes with the highest activity and stability for electrocatalytic water splitting in an alkaline medium (1.0 M KOH). The as-prepared CoP2/Co2P@CNT-CC integrates the advantages of the abundant active sites and confinement effect of CNTs, imparting promising electrocatalytic activities and stability in catalyzing both hydrogen evolution reaction and oxygen evolution reaction. Remarkably, electrocatalytic water splitting cells assembled using CoP2/Co2P@CNT-CC electrodes as the cathode and anode, respectively, require a cell voltage of 1.55 V at 10 mA cm–2, which is lower than that of the commercially noble Pt/C/CC and RuO2/CC catalyst couple (1.68 V). Besides, a CoP2/Co2P@CNT-CC||CoP2/Co2P@CNT-CC system shows outstanding durability for a period of 100 h at 10 mA cm–2. This work may provide new ideas for designing bifunctional electrocatalysts for applications in electrocatalytic water splitting.
研究领域:
材料科学
·
电化学
·
能源转换与储存
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaobo Han,Junting Yang,Hengbin Zhao,Qingchun Wang,Fei Ruan,Weixiang Shang,Jinxiao Bao,Yuwei Ma
The construction of a heterojunction with multichannel charge transfer represents an effective strategy for achieving efficient visible light photocatalytic hydrogen production. In this study, the TiO 2 /CdS/Co 2 P ternary photocatalyst was synthesized by stepwise assembly method. The UPS and work function(Φ) results confirmed the band structure and associated band bending of TiO 2 /CdS/Co 2 P, the multichannel electrons transfer from CdS to TiO 2 and CdS to Co 2 P can induce more charge carriers to participate in photocatalytic reaction. Moreover, combine with the results of 3D model charge density and photoelectric performance characterization, proves that the as-prepared ternary photocatalyst accelerates the transfer of photo-generated electrons and reduces the charge recombination rates. According to the Gibbs free energy results, Co as the additional active site is beneficial for hydrogen desorption, thus achieving a high hydrogen production result. Based on the synergistic effects, TiO 2 /55CdS/5.5Co 2 P presented a relatively high hydrogen evolution rate of 250.9 μmol h −1 under the visible light irradiation (λ ≥ 420 nm), which is almost 2 times higher than CdS/5.5Co 2 P (122.8 μmol h −1 ). This work provides theoretical guidance and practical insights for constructing ternary heterojunction structures with central-to-bilateral electron migration to achieve efficient visible-light photocatalytic hydrogen production.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Taiyu Chen,Qikang Wu,Feng Li,Rui Zhong,Zheng Chen
In order to realize efficient hydrogen production with low energy consumption, the urea oxidation reaction (UOR) is used as a substitute for the oxygen evolution reaction (OER) to reduce the thermodynamic potential of water electrolysis. Highly efficient and stable nonprecious metal electrocatalysts are desired to resolve the slow kinetics resulted from the six-electron transfer process inherent in UOR. Here, the heterostructured nanocrystals of Co2P–Ni3S2 were constructed through deposition of Ni salt on acetylene black coated with CoP species (Co2P–Ni3S2/C) and subsequent vulcanization. Compared with single component CoP/C and Ni3S2/C, the Co2P–Ni3S2/C with optimal ratio of Co2P and Ni3S2 shows lower potential (1.338 V) to reach 10 mA·cm–2, which also realizes good long-term stability for nearly 100 h in chronoamperometry test. The X-ray photoelectron spectroscopy and UOR results together revealed that Ni3+ is the main site to form active intermediates, which is formed by the electron transfer from Ni3S2 to Co2P through a heterostructured interface. Inspired by the excellent UOR activity of Co2P–Ni3S2/C, as an anode in electrolyte for hydrogen evolution through urea-assisted water splitting, the current density of 10 mA·cm–2 can be achieved at a potential of only 1.389 V. Therefore, the construction of two component heterostructure is conducive to electron transfer and active site regulation, so as to realize the development of effective UOR catalyst and promote the UOR application for energy-saving hydrogen production.
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
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Xiaodong Chen,Zhi Cheng,Jiao Li,Hongyu Chen,Siyuan Liu,Shuxian Wei,Zhaojie Wang,Xiaoqing Lu
Non-precious transition metal-based electrocatalysts with high activity are the promising candidates for substituting Pt- or Ru-based electrocatalyst in hydrogen evolution. In this study, we proposed a core-shell engineering to combine the amorphous NiCoP and crystalline Co2P (a-NiCoP/Co2P@NF), which requires an ultra-low overpotential of only 26 mV to achieve the benchmark current density of 10 mA cm-2. Furthermore, it achieves an industrial-level hydrogen evolution current density of 500 mA cm-2 with excellent stability. The superior catalytic performance and stability can be attributed to the hierarchical amorphous/crystalline interface and the electron-rich interfacial Co sites. Amorphous NiCoP shell can not only protect the internal Co2P from corrosion, but also provide a larger electrochemical active area. Together, the Co2P core provides fast electron transport and promotes H2 emission from the interfacial electron-rich Co sites. This work gives inspiration to the rational design of advanced core-shell structure between amorphous and crystalline.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yi-Shan Ouyang,Qing-Yuan Yang
Photocatalyst systems generally consist of catalysts and cocatalysts to realize light capture, charge carrier migration, and surface redox reactions. Developing a single photocatalyst that performs all functions while minimizing efficiency loss is extremely challenging. Herein, rod-shaped photocatalysts Co 3 O 4 /CoO/Co 2 P are designed and prepared using Co-MOF-74 as a template, which displays an outstanding H 2 generation rate of 6.00 mmol·g −1 ·h −1 when exposed to visible light irradiation. It is 12.8 times higher than pure Co 3 O 4 . Under light excitation, the photoinduced electrons migrate from the catalysts of Co 3 O 4 and CoO to the cocatalyst Co 2 P. The trapped electrons can subsequently undergo a reduction reaction to produce H 2 on the surface. Density functional theory calculations and spectroscopic measurements reveal that enhanced performance results from the extended lifetime of photogenerated carriers and higher charge transfer efficiency. The ingenious structure and interface design presented in this study may guide the general synthesis of metal oxide/metal phosphide homometallic composites for photocatalysis.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）