ADVANCED MATERIALS
·
2019
·Vol. 31
·期 33
·1902228
·
IF 25.809
Zhuosen Wang,Jiadong Shen,Jun Liu,Xijun Xu,Zhengbo Liu,Renzong Hu,Lichun Yang,Yuezhan Feng,Jun Liu,Zhicong Shi,Liuzhang Ouyang,Yan Yu,Min Zhu
Lithium–sulfur (Li–S) batteries have attracted much attention in the field of electrochemical energy storage due to their high energy density and low cost. However, the “shuttle effect” of the sulfur cathode, resulting in poor cyclic performance, is a big barrier for the development of Li–S batteries. Herein, a novel sulfur cathode integrating sulfur, flexible carbon cloth, and metal–organic framework (MOF)-derived N-doped carbon nanoarrays with embedded CoP (CC@CoP/C) is designed. These unique flexible nanoarrays with embedded polar CoP nanoparticles not only offer enough voids for volume expansion to maintain the structural stability during the electrochemical process, but also promote the physical encapsulation and chemical entrapment of all sulfur species. Such designed CC@CoP/C cathodes with synergistic confinement (physical adsorption and chemical interactions) for soluble intermediate lithium polysulfides possess high sulfur loadings (as high as 4.17 mg cm –2 ) and exhibit large specific capacities at different C-rates. Specially, an outstanding long-term cycling performance can be reached. For example, an ultralow decay of 0.016% per cycle during the whole 600 cycles at a high current density of 2C is displayed. The current work provides a promising design strategy for high-energy-density Li–S batteries.
研究领域:
电化学储能
·
材料科学
·
电池技术
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 13
·4555-4566
·
IF 4.39
Ishaq Muhammad,Maher Jabeen,Peiran Wang,Yu-Shi He,Xiao-Zhen Liao,Zi-Feng Ma
The advancement of novel synthetic approaches for micro/nanostructural manipulation of transition metal phosphide (TMP) materials with precisely controlled engineering is crucial to realize their practical use in batteries. Here, we develop a novel spray-drying strategy to construct three-dimensional (3D) N,P co-doped graphene (G-NP) microspheres embedded with core–shell CoP@C and MoP@C nanoparticles (CoP@C⊂G-NP, MoP@⊂G-NP). This intentional design shows a close correlation between the microstructural G-NP and chemistry of the core–shell CoP@C/MoP@C nanoparticle system that contributes towards their anode performance in lithium-ion batteries (LIBs). The obtained structure features a conformal porous G-NP framework prepared via the co-doping of heteroatoms (N,P) that features a 3D conductive highway that allows rapid ion and electron passage and maintains the overall structural integrity of the material. The interior carbon shell can efficiently restrain volume evolution and prevent CoP/MoP nanoparticle aggregation, providing excellent mechanical stability. As a result, the CoP@C⊂G-NP and MoP@⊂G-NP composites deliver high specific capacities of 823.6 and 602.9 mA h g−1 at a current density of 0.1 A g−1 and exhibit excellent cycling stabilities of 438 and 301 mA h g−1 after 500 and 800 cycles at 1 A g−1. The present work details a novel approach to fabricate core–shell TMPs@C⊂G-NP-based electrode materials for use in next-generation LIBs and can be expanded to other potential energy storage applications.
研究领域:
材料科学
·
能源存储
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PubMed
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 9
·2714-2727
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IF 5
Zhiqi Guo,Yao Tian,Guangjin Dou,Ye Wang,Jiaping He,Hao Song
Photocatalytic pure water splitting to produce H2 with a two-electron process is an effective and more kinetically favorable method to obtain clean energy. Herein, a CoP decorated 2D/2D red phosphorus/B doped g-C3N4 (CoP/RP/BCN) type II heterojunction is synthesized to realize photocatalytic pure water splitting via a two-electron process. The optimal ternary CoP/RP/BCN photocatalyst displays a prominent H2 yield of 166.2 μmol h−1 g−1, which is 207.8-fold greater than that of g-C3N4. The deep insight into the photocatalytic mechanism of CoP/RP/BCN reveals that the improved photocatalytic efficiency is ascribed to the synergistic effect of extended light absorption, accelerated charge transfer, and increased active reaction sites due to the novel heterostructure RP/BCN and co-catalyst CoP loaded. The introduction of B facilitates the intrinsic charge excitation and increases the work function of the carbon nitride framework, promoting charge transfer and heterojunction formation. With a phosphorization reaction, RP nanosheets tightly combine with BCN to enhance the visible-light absorption and construct the 2D/2D type II heterojunction. The difference in the work function between RP and BCN leads to band bending in the interface of the heterojunction, which induces an opposite migration of electrons and holes to enhance electron–hole pair separation. Moreover, CoP reduces water adsorption energy and provides H2 generation sites, facilitating the final step of pure water splitting to produce H2. This work proposes a promising strategy to achieve highly effective photocatalytic pure water splitting without any sacrificial reagents.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaowei Fu,Qichang Li,Hongdong Li,Weiping Xiao,Zhenyu Xiao,Guangrui Xu,Dehong Chen,Zexing Wu,Lei Wang
Transition-metal phosphides (TMPs) have attracted extensive attention in energy-related fields, especially for electrocatalytic hydrogen evolution reaction (HER). However, it is imperative to develop a facile and time-consuming approach to prepare metal phosphides with satisfactory catalytic performance. Herein, nitrogen-doped CoP-Co2P decorated with Ru (Ru/N-CoP-Co2P) is synthesized (Ru/N-CoP-Co2P) through a hydrothermal route and following an ultrafast and simple microwave avenue within 20 s. The achieved Ru/N-CoP-Co2P possesses an interconnected porous morphology to expose abundant active sites and accelerate the mass transport. Moreover, N doping and Ru-supported decorated Ru/N-CoP-Co2P also play a key role in promoting the electrocatalytic activity. Therefore, the as-designed Ru/N-CoP-Co2P presents good catalytic performance for the HER in a wide pH range. Ru/N-CoP-Co2P merely needs overpotentials of 63, 100, and 65 mV to obtain 10 mA cm–2 in acidic, alkaline, and seawater electrolytes. This research provides a novel and efficient strategy for the synthesis of TMPs with highly efficient catalytic activity.
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高影响因子
NEW CARBON MATERIALS
·
2024
·
IF 6.5
Xiao-li Yan,Kui Wang,Shu-wei Hao,Guang-da Zhou,Hao-wei Yang,Hua Zhang,Jun-jie Guo
Exploring cost-efficient and highly-efficient noble metal-free catalysts for the oxygen reduction reactions (ORRs) involved in sustainable energy devices remains a great challenge. Transition-metal phosphides supported on heteroatom-doped carbons have shown potential as alternative candidates for precious metals because of their tunable electronic structures and higher catalytic performance. Phosphating was used to construct CoP nanoparticles (NPs) anchored on a nitrogen-doped porous carbon framework (CoP@NC) from Co NPs loaded on NC, using PH 3 gas released from NaH 2 PO 2 during heat treatment. The dodecahedral structure of Co NPs was retained in their transformation to CoP NPs. The CoP@NC electrocatalyst shows a remarkable ORR activity with a half-wave potential up to 0.92 V under alkaline conditions, which is attributed to the combined coupling between the well dispersed CoP nanoparticles on the nitrogen-doped carbon and the efficient mass transport in the porous structure. Zinc-air batteries assembled with the CoP@NC electrocatalyst as a cathode have a high open-circuit voltage of 1.51 V and power density of 210.1 mW cm −2 . This work provides a novel strategy to develop low-cost catalysts with an excellent ORR performance to promote their practical use in metal-air batteries
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Songjie Li,Tiantian Liu,Shuang Yu,Xiaomei Yu,Huijing Yang,Chengduo Wang,Jin You Zheng
Hydrogen production via electrocatalytic water splitting has garnered significant attention, due to the growing demand for clean and renewable energy. However, achieving low overpotential and long-term stability of water splitting catalysts at high current densities remains a major challenge. Herein, a CoP@CoNi layered double hydroxide (LDH) electrode was synthesized via a two-step electrodeposition process, demonstrating oxygen evolution reaction, with an overpotential (ƞ 400 ) of 373 mV and a Tafel slope of 64.2 mV/dec. Subsequently, a superhydrophilic CoP@CoNi LDH-Pt electrode was prepared using an in situ oxidation method, with Pt clusters anchored within the CoP@CoNi LDH for the hydrogen evolution reaction, with an overpotential (ƞ 400 ) of 119 mV and a Tafel slope of 33.6 mV/dec. The CoP@CoNi LDH-Pt||CoP@CoNi LDH system achieved a cell voltage of 1.96 V at 1000 mA/cm 2 , maintaining stable performance after water electrolysis for 160 h. These remarkable outcomes stem from the fast charge transfer, improved mass transfer, and superior stability of the catalysts. Heterostructure electrodes were constructed to optimize the electrocatalytic kinetics through strong interfacial electronic interactions, while superhydrophilic electrodes were fabricated to improve the mass transfer process at a high current density. Anchoring high-activity components in catalysts prevents their detachment during water electrolysis, enhancing the structural stability of the electrodes. This study provides a new approach for large-scale preparation of efficient water electrolysis catalysts and offers significant potential for industrial hydrogen production applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chaojie Lyu,Jiarun Cheng,Kaili Wu,Jiwen Wu,Ju Hao,Yuanyuan Chen,Huichao Wang,Yunguo Yang,Ning Wang,Woon-Ming Lau,Jinlong Zheng
Transition metal-based electrocatalysts are the promising candidates to substitute noble metal-based catalysts for water electrolysis, owing to its abundant earth reserves and inexpensive fabrication costs. Interface engineering and cation doping engineering are verified as the effective methods to improve the sluggish electrocatalytic performance of transition metal-based electrocatalysts. Here, we synthesized a self-supported heterostructure of Ce doped Co(OH) 2 nanosheets/CoP nanowires on the support of nickel foam (Ce-Co(OH) 2 /CoP/NF) by simple hydrothermal method , low-temperature phosphorization method. The Ce atom doping can lead to lattice distortion and abundant superficial defects on crystal surface, which will generate more active sites and faster charges transformation. The heterointerface between Ce-Co(OH) 2 and CoP also can lead to electronic structure modulation at interface domain, which not can induce much fresh active sites in this area, but can optimize the active sites to the optimal state for superior catalytic activity. Benefitting from these, it only needs the overpotentials of 253 and 56 mV to realize 10 mA/cm 2 for OER and HER under 1 M KOH solution, which is much enhance than single-phased samples. As the bifunctional electrocatalyst for two-electrode system, it merely requires 1.53 V to attain 10 mA/cm 2 in 1 M KOH, and it also exhibits outstanding overall water splitting performance in alkaline natural electrolyte, along with excellent catalytic long-time durability. In addition, the Ce-Co(OH) 2 /CoP/NF-based electrolyzer also could achieve energy-saving hydrogen production, and simultaneously oxidative degradation of organic materials or biomass upgrading at anode under lower voltages. This work paves a novel idea to fabricate high-efficient bifunctional electrocatalysts for energy-saving H 2 production.
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Small
·
2021
·Vol. 18
·期 2
·2103866
·
IF 13.281
Xiaoyan Wang,Yang Fei,Jie Chen,Yixiang Pan,Weiyong Yuan,Lian Ying Zhang,Chun Xian Guo,Chang Ming Li
3D ZIF-67-particles-impregnated cellulose-nanofiber nanosheets with oriented macropores are synthesized via directional-freezing-assisted in situ self-assembly, and converted to 3D CoP-nanoparticle (NP)-embedded hierarchical, but macropores-oriented, N-doped carbon nanosheets via calcination and phosphidation. The obtained nanoarchitecture delivers overpotentials at 10 and 50 mA cm −2 and Tafel slope of 82.1 and 113.4 mV and 40.8 mV dec −1 in 0.5 M H 2 SO 4 , and of 97.1 and 136.6 mV and 51.2 mV dec −1 in 1 M KOH, all of which are superior to those of the most reported non-noble-metal-based hydrogen evolution reaction (HER) catalysts. This catalyst even surpasses commercial Pt/C for a much lower overpotential at high current densities, which is essential for large-scale hydrogen production. Its catalytic activity can be further optimized to become one of the best in both 0.5 M H 2 SO 4 and 1 M KOH. The outstanding catalytic activity is ascribed to the uniformly-dispersed small CoP NPs in the 3D carbon sheets and the hierarchical nanostructure with rich oriented pores. This work develops a facile, economical, and universal self-assembly strategy to fabricate uniquely nanostructured hybrids to simultaneously promote charge transfer and mass transport, and also offers an inexpensive and high-performance HER catalyst toward industry-scale water splitting.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Ajing Ren,Bo Yu,Minghua Huang,Zhicheng Liu
Transition metal phosphides have been considered as prospective bifunctional electrocatalysts for overall water splitting due to high activity and excellent stability. In this work, we report a facile strategy for synthesizing high-dispersion cobalt Prussian blue analogue-derived CoP nanoparticles that are decorated on N-doped electrospun porous carbon nanofibers (denoted as CoP@CNF). The CoP@CNF is obtained using electrospinning, subsequent carbonization , and phosphatization treatment. Due to the high conductivity, abundance of electrocatalytic active sites, and the synergistic effect between ultra-fine CoP nanoparticles and porous N-doped electrospun carbon nanofibers, the prepared CoP@CNF catalyst exhibits remarkable activity with low overpotentials (127 and 300 mV) at 10 mA cm −2 , and small Tafel slopes (73.4 and 73.8 mV dec −1 ) for hydrogen evolution reaction and oxygen evolution reaction in alkaline electrolyte , respectively. A water electrolyzer cell fabricated by applying CoP@CNF as both anode and cathode catalysts needs 1.64 V to achieve 10 mA cm −2 , and exhibits remarkably long-term stability. This work provides useful guidance for the preparation of bifunctional nanocomposite electrocatalysts and further extends the application of Prussian blue analogues in the field of energy conversion.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 6
·2436-2442
·
IF 3.269
Xiao-yu Yan,Samrat Devaramani,Jing Chen,Duo-liang Shan,Dong-dong Qin,Qin Ma,Xiao-quan Lu
Recent research suggests that transition metal phosphides (TMPs) are one of the most promising nobel-metal-free electrocatalysts for catalyzing the hydrogen evolution reaction. In this study, we report rectangular CoP nanosheet (NS) arrays on carbon cloth (CoP NS/CC) via a concise two-step synthetic method. The 3D rectangular CoP NS/CC with a three-dimensional porous and self-supported structure was fabricated via a hydrothermal method, followed by a low-temperature phosphidation treatment. Such 3D rectangular CoP NS/CC, as an HER electrocatalyst in acidic solution, exhibited high activity, good stability, and nearly 100% Faradaic efficiency (FE). The electrocatalyst requires an overpotential of 92, 112 and 195 mV to achieve current densities of 10, 20 and 100 mA cm−2, respectively, and maintain its catalytic stability for more than 50 h. In addition, the electrocatalyst works well in a neutral environment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ze-Feng Xu,Chuan-Wu Chen,Ya-Nan Jing,Da-Qiang Liu,Lei-Lei Li,Xing-Liang Yin,Jing-Hong Wen
Transition metal phosphides (TMPs) suffer from electrocatalytic activity loss due to particle aggregation. We have proposed a MOF confinement strategy synthesizes CoP-NiP 2 quantum dots (QDs) embedded in N-doped carbon (CoP-NiP 2 QDs/NC), achieving atomic-level dispersion of active species. Electrochemical analyses reveal: 1) hydrogen evolution reaction (HER) performance surpassing commercial 20% Pt/C above 42 mA·cm -2 with ultralow loading (0.2 mg·cm -2 ); 2) Superior oxygen evolution reaction (OER) and overall water splitting in alkaline/neutral electrolytes, outperforming commercial RuO 2 and RuO 2 ||Pt/C electrolytic cell. Enhanced charge transfer kinetics supported by density functional theory (DFT) calculations, which reveal synergistic electronic interactions between CoP and NiP 2 optimizing Gibbs free energy of reactions and water adsorption/dissociation energetics. This work shows a confinement-driven design strategy for multicomponent TMP QDs, bridging synthetic control of compound architectures with their electrocatalytic functionality for efficient hydrogen production.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Neng Chen,Sai Che,Yu Yuan,Hongchen Liu,Na Ta,Guohua Li,Feng Jiang Chen,Guang Ma,Bo Jiang,Ni Wu,Weiqi Yu,Fan Yang,Yongfeng Li
Transition metal phosphide (TMP) emerges as a promising electrocatalyst for overall water splitting (OWS). However, conventional TMP materials require exogenous metal ions to participate in coordination reactions, which usually suffer from active site blocking, pronounced intrinsic impedance, and inevitable catalyst shedding at high current density. Herein, a novel in-situ construction strategy has been developed to grow N -doped carbon (NC) enwrapped Co/CoP nanosheets directly onto Co foam (abbreviated as CoF) through a three-step transformation of Co to Co(OH) 2 to Co-Metal-Organic Framework (Co-MOF) to Co/CoP/NC. In the entire preparation process, Co metal is only provided by the CoF substrate without external metal sources. Such in-situ construction yields tight contact at the interface of the heterogeneous catalyst, leading to much-reduced impedance and boundary vacancy, while the porous nitrogen-doped carbon backbone further endows the catalyst with the exposure of massive active sites, promotes mass transfer, and possesses high electrical conductivity. The Co/CoP/NC/CoF requires overpotentials of only 64 mV/263 mV@10 mA cm −2 and 414 mV/481 mV@400 mA cm −2 for both HER/OER in 1.0 M KOH, respectively. Remarkably, it reveals excellent OWS catalytic activity with a cell voltage of 1.56 V@10 mA cm −2 and 1.88 V@200 mA cm −2 . This strategy of in-situ interface engineering transformation provides new ideas for direct device processing and construction of highly-efficient transition-metal-based OWS electrode materials.
研究领域:
材料科学
·
电化学
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高影响因子
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