Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 6
·2702-2714
·
IF 6.482
Arnauld Robert Tapa,Wanchun Xiang,Abdelaal. S. A. Ahmed,Senwei Wu,Bin Li,Qiufen Liu,Chawuch Machar Jacob Chuti,Xiujian Zhao
In this work, we employ a simple hydrothermal method to synthesize a metal–organic framework (MOF) derived selenide from a reduced graphene oxide (rGO)/structured zeolitic imidazolate framework (ZIF). The resulting MOF-derived selenide (rGO/ZnSe/CoSe2) consists of porous nanowires encapsulated in a carbon matrix and having a high surface area (169.30 m2 g−1). This porous rGO/ZnSe/CoSe2 is combined with polystyrene sulfonate-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) for use as a CE for DSSCs. CEs based on different weight percentages (1, 3, and 5 wt%) of rGO/ZnSe/CoSe2 powder in PEDOT:PSS solution are compared with the commonly used platinum (Pt) based CE. The rGO/ZnSe/CoSe2–PEDOT:PSS composite benefits from the synergistic effects between porous rGO/ZnSe/CoSe2 having a high surface area and PEDOT:PSS which holds superior conductivity and strong binding capability with a fluorine-doped tin oxide (FTO) glass substrate. Therefore, the 3 wt% rGO/ZnSe/CoSe2–PEDOT:PSS composite based CE achieved a good stability and superior electrocatalytic activity compared to Pt CE. Furthermore, DSSCs based on a 3 wt% rGO/ZnSe/CoSe2–PEDOT:PSS composite CE achieved a higher power conversion efficiency (PCE) of 8.60%, compared to the PCE of the Pt CE based DSSC (7.14%) prepared under similar conditions. This work has revealed a new approach to prepare MOF-derived selenide based CEs with high electrocatalytic activity without any calcination. In addition, we demonstrated that the low-cost 3 wt% rGO/ZnSe/CoSe2–PEDOT:PSS composite CE is an excellent candidate to replace Pt CE in DSSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Lin Sun,Yu Liu,Ming Yan,Weijing Liu,Xiaoying Liu,Weidong Shi
Reasonable structures are beneficial to improve the electronic transfer efficiency of the electrode. A novel two/three-dimensional structure with multiphase CoSe 2 (M-CoSe 2 ) nanoboxes fixed on CoAl-LDH nanoflowers on carbon paper (CP) is reasonably designed. The formation mechanism of M-CoSe 2 is systematically studied through the gradient change of the selenization conditions. Benefitting from the hollow structure of the ZIFs derivatives (carbon-nitrogen frameworks, CNFs), numerous charge transfer channels are provided. Furthermore, M-CoSe 2 with enhanced conductivity can furnish abundant active sites and a synergistic effect. The specific capacity of the optimal anode M-CoSe 2 /CNFs/CoAl-LDO/CP can reach 343.6 mAh g −1 at 1 A g −1 , which is equivalent to twice that of the monomer material. The hybrid-supercapacitor (M-CoSe 2 /CNFs/CoAl-LDO/CP//activated carbon) can provide a high energy density of 50.8 Wh kg −1 at 800 W kg −1 , and high stability (capacity loss rate of 3.2%, 10,000 cycles). Besides, LEDs can be lit by HSCs, demonstrating their application potential.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 13
·3116-3121
·
IF 5.6
Xinyue Wang,Yibin Wang,Xinzhi Ma,Lingling Xu,Sirui Liu,Wei Wang,Huiqing Lu,Lili Wu
Cobalt diselenide (CoSe2) is considered a promising catalyst for hydrogen evolution reaction (HER); however, the limited active number, agglomeration, and quick deactivation by acid etching hinder its broad adoption. Herein, we report carbon layer-covered CoSe2 nanowire arrays grown on carbon cloth (C@CoSe2/CC). The structure of the nanowire array demonstrates synergistic effects in promoting the infiltration of electrolytes, accelerating the diffusion of H2 bubbles, and preventing CoSe2 from being etched by the electrolyte. Consequently, the overpotential and Tafel slope (193 mV, 54.3 mV dec−1) obtained sustained 24 h with a negligible overpotential deterioration. This study provides insights into optimizing the intrinsic activity of active sites.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Ting Feng,Fang Wang,Jianfei Lei,Yahui Gao,Xiujuan Jin,Yulin zhou,Jianhui Jiang
In-situ engineered heterogeneous transition metal electrocatalysts with excellent hydrogen evolution reaction performance are generally challengeable in the domain of electrocatalysis . Here, we provide a robust CoO/CoSe 2 hybrid electrocatalyst towards hydrogen evolution reaction in a wider pH limits through an effective in situ partial surface-oxidation-selenization route. The purpose and ideas of the design are elaborated by the clever use of the process of partial transforming MOFs to LDHs , in situ growing ZnCo-LDHs on the surface of ZIF-8, increasing the number of oxygen-containing groups on the surface of MOFs to achieve more Co and subsequent CoO, and constructing CoO/CoSe 2 heterostructure materials by further selenization. More importantly, the CoO/CoSe 2 nanoparticles is encapsulated with in-situ grown nitrogen-doped graphitized carbon shell and embedded in N, Se co-doped carbon network. Owing to the well-designed nanostructure and the synergistic effect from CoO and CoSe 2 , this hybrid electrocatalyst show substantially enhanced activity and improved long-term durability beyond CoO under both acid and alkaline conditions. This research work may pave a new avenue for the design of universal CoO-based electrocatalysts and their application in clean energy related fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 8
·3702-3712
·
IF 9.6
Mu Zi-Jie,Gao Yan-Jun,Dong Wen-Shuai,Li Zong-You,Song Qing-Yi,Huang Han-Jiao,Xing Li-Dong,Zhang Jian-Guo,Wang Wei,Yu Qi-Yao
The highly reversible insertion/extraction of large-radius K + into electrode materials remains a tough goal, especially for conversion-type materials. Herein, we design a current collector-integrated electrode (N–CoSe/CoSe 2 –C@Cu) as an advanced anode for potassium-ion battery (PIBs). The conductive CoSe/CoSe 2 heterojunction with rich Se vacancy defects, conductive sp 2 N-doped carbon layer, and the elastic copper foil matrix can greatly accelerate the electron transfer and enhance the structural stability. Consequently, the well-designed N–CoSe/CoSe 2 –C@Cu current collector-integrated electrode displays enhanced potassium storage performance with regard to a high capacity (325.1 mAh·g −1 at 0.1 A·g −1 after 200 cycles), an exceptional rate capability (223.5 mAh·g −1 at 2000 mA·g −1 ), and an extraordinary long-term cycle stability (a capacity fading of only 0.019% per cycle over 1200 cycles at 2000 mA·g −1 ). Impressively, ex situ scanning electron microscopy (SEM) characterizations prove that the elastic structure of copper foil is merged into the cleverly designed N–CoSe/CoSe 2 –C@Cu heterostructure, which buffers the deformation of structure and volume and greatly promotes the cycle life during the potassium/depotassium process. Graphical abstract
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 22
·7046-7056
·
IF 7.393
Wen Wang,Qiaoyu Cui,Dong Sun,Qun Yang,Jun Xu,Wei Liao,Xueqin Zuo,Huaibao Tang,Guang Li,Shaowei Jin
The low conductivity and catalytic activity of counter electrode (CE) materials in the electrolyte of dye-sensitized solar cells (DSSCs) has resulted in unprecedented challenges, limiting their development. Herein, a highly efficient CE material was synthesized by uniformly distributing transition metal selenides in a metal–organic framework (MOF, denoted as CoSe2@NC), and then integrating carbon nanotubes, which were finally designed as integrated interconnected nanoreactors (CoSe2@NC-CNTs). Consequently, DSSC with three-dimensional (3D) reticular CoSe2@NC-CNT CE displayed a superior power conversion efficiency (PCE) of 9.25%, exceeding that of Pt CE (7.81%). This outstanding performance is attributed to: (1) the increased specific surface area, which promotes the absorption of the dye and electrolyte, (2) the metal-on-MOF hierarchical structure as a unique crystalline porous material, which optimizes the efficiency of the metal nanoparticles, (3) the doping of heteroatom (N), which provides more defect sites and enhances the catalytic activity, and (4) the porous walls of MOF and internal connected CNTs, which provide sufficient pathways for the fast diffusion of electrons and iodine ions. The present work not only strengthens the understanding of the coupling interaction between porous CoSe2@NC and CNTs, but also offers an extended strategy of structuring further well-defined metal-on-MOF hybrids.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 4
·045012
·
IF 2.07
Wenhua Li,Meng Zheng,Zizun Tian,Guoqiang Long,Shule Zhang,Qianqiao Chen,Qin Zhong
Exploration of counter electrode (CE) catalysts with excellent reduction activity to Sn2− and low charge transfer resistance (Rct) is always a major challenge for the development of quantum dot sensitized solar cells. In this work, coral-like CoSe2 - nitrogen-doped porous carbon hydrides (CoSe2-NC) were successfully prepared by two-step calcination of zeolitic imidazolate framework (ZIF), including carbonization and selenization process. Scanning electron microscopy shows that the CoSe2-NC catalyst presents a coral-like microscopic morphology composed of nanospheres. Electrochemical impedance spectroscopy displays that the CoSe2-NC CE presents a low Rct of 1.04 Ω. The PCE of the QDSSC based CoSe2-NC CE is up to 5.06%，which is 26%, 87% higher than those of CoSe2 and NC CEs. The enhanced photovoltaic performance is attributed to the unique coral-like structure and the synergistic catalytic effect of CoSe2 and NC.
研究领域:
材料科学
·
能源科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Dong Wang,Xianrui Bai,Jianzong Man,Hua Yang,Gaohui Du,Zhaoyang Wang,Pengfang Zhang,Fanghui Du,Wenjing Shi
Advanced flexible CoSe 2 @carbon fibers (CoSe 2 @CNFs) were synthesized through electrospinning and sintering processes, with the aim of being applied to high rate and long cycle stability of sodium ion batteries (SIBs) and lithium‑sulfur batteries (LSBs). CNFs interconnect ultrafine CoSe 2 particles to form a coating structure, and the fibers intertwine to create a self-standing three-dimensional network. This not only helps to store electrons in electrochemical reactions but also facilitates the adsorption and desorption of Na + /S species. Therefore, when directly used as an anode for SIBs, the electrode has a reversible capacity of 202.1 mAh g −1 after 3000 cycles at a current density of 10 Ag −1 . The microstructure changes of CoSe 2 during the charging and discharging process were investigated in detail by TEM, and the results showed that the crystal form of CoSe 2 changed from long range-order transforms into short-range disorder after sodiated. In addition, the electrocatalytic advantages of flexible electrodes as catalysts for lithium polysulfides can be easily demonstrated through catalytic experiments. Leveraging the morphology and inherent advantages of CoSe 2 , the flexible CoSe 2 @CNFs electrode demonstrates a reversible capacity of 566.8 mAh g −1 at 5 C after 1500 cycles. Most importantly, the morphology of CoSe 2 after the electrochemical reaction was carefully investigated, demonstrating its consistency before and after the electrocatalytic reaction. Flexible CoSe 2 @CNFs provide diversity for the development of high rate performance SIBs and long cycle stability LSBs, and promote a deeper understanding of their morphological evolution during electrochemical reactions.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 16
·7088-7098
·
IF 9.931
Chao Cui,Zengxi Wei,Gang Zhou,Weifeng Wei,Jianmin Ma,Libao Chen,Chengchao Li
Developing electrode materials with a full conversion reaction is an effective route to break through the capacity barriers, but this goal remains a great challenge. In this work, we report the synthesis of CoSe2 anodes with a quasi-reversible conversion reaction by uniformly encapsulating CoSe2 nanoparticles in nitrogen-doped carbon nanofibers (CoSe2/N-CNFs). The space-confined effect of CNFs effectively inhibits pulverization and amorphization of CoSe2 during charge and discharge and thus remarkably ensures the integrity of the crystal structure. Meanwhile, pseudocapacitive contributed by the size effect of CoSe2 nanodots and excellent conductivity due to doped nitrogen heteroatoms give the electrode outstanding electrochemical properties. When used as an anode, the CoSe2/N-CNFs achieved a reversible capacity of 371.8 mA h g−1 after 500 cycles at 0.2 A g−1. Even at a high current density of 2 A g−1, the discharge capacity of the CoSe2/N-CNFs still reached 308 mA h g−1 after 1000 cycles with excellent rate performance. The first principles calculations demonstrate that the heterointerfaces between CoSe2 and nitrogen-doped carbon can significantly enhance the stability of the structure and improve the storage/diffusion capability of Na+. Moreover, ex situ high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) reveal that the unique structure enables quasi-reversible crystalline-phase transformation of CoSe2, which leads to the superior cycling stability of the battery with high capacity retention.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yuan Ma,Chunhong Li,Muhammad Aizaz Ud Din,Lan Zhao,Nengcong Pan,Yuhan Lei,Nanpu Cheng
Affordable and highly effective electrocatalysts are essential for achieving industrial-scale hydrogenation of water applications. The successful fabrication of Fe-doped CoSe 2 nanosheets supported on nickel foam (Fe x -CoSe 2 /NF) via a two-step electrochemical deposition method is presented in this study, showing their effectiveness as an electrocatalyst for the oxygen evolution reaction (OER) in water splitting. The performance of Fe x -CoSe 2 /NF initially improves with increasing x, reaching an optimal value before subsequently declining. The ideal catalyst, Fe 0.75 -CoSe 2 /NF, requires a low overpotential of 256 mV at 10 mA cm −2 , and even at 100 mA cm −2 , the overpotential remains as low as 291 mV. The catalyst also displays a low Tafel slope of 34.37 mV dec −1 , highlighting the fast OER kinetics. Furthermore, Fe 0.75 -CoSe 2 /NF demonstrates exceptional electrochemical stability. The enhanced OER catalytic performance of Fe-doped CoSe 2, compared to intrinsic CoSe 2, is attributed to the thinner nanosheets structure and optimized electronic structures, which provide a higher density of active sites and facilitate a new reaction coordination with a lower energy barrier during the OER process. These findings not only offer new mechanistic insights into Fe-doped CoSe 2 systems but also provide a scalable and cost-effective pathway for designing next-generation, non-precious-metal-based electrocatalysts.
研究领域:
电化学
·
纳米材料
·
催化
·
能量转换
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 30
·16268-16279
·
IF 14.511
Hui Zheng,Jianyi Wang,Hongwei Li,Shuqi Deng,Yinze Zuo,Wei Yan,Jiujun Zhang
Sodium-ion batteries (SIBs) are among the most promising technologies for large-scale clean electrical energy storage and conversion. Developing SIB anode materials, which pose the major limitation in achieving high performance, including transition metal selenides (TMSe) with high sodium storage capacities is currently the cutting-edge research. In this paper, heterostructured NiSe2/CoSe2 nanoparticles are successfully synthesized by simple thermal selenization of a heterojuncted Ni(OH)2/Co(OH)2 precursor obtained through one-step solvothermal co-precipitation. Electrochemical tests and DFT calculations as well as in situ XRD measurements are used for investigating the Na storage properties and understanding the underlying mechanism. It is found that the heterointerface formed at the crystalline planes of NiSe2 and CoSe2 significantly improves the electron conductivity and optimizes the Na species adsorption, which accelerates electrochemical reaction kinetics and thus improves pseudocapacitive contribution. Therefore, the as-prepared NiSe2/CoSe2 nanoparticles exhibit superior Na storage properties such as enhanced Na storage capacity and rate capability as well as exceptional cycling stability at ultra-high current density.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·304-309
·
IF 8.897
Zhang Longcheng,Liang Jie,Yue Luchao,Xu Zhaoquan,Dong Kai,Liu Qian,Luo Yonglan,Li Tingshuai,Cheng Xiaohong,Cui Guanwei,Tang Bo,Alshehri Abdulmohsen Ali,Alzahrani Khalid Ahmed,Guo Xiaodong,Sun Xuping
Electrocatalytic oxygen reduction reaction (ORR) provides an attractive alternative to anthraquinone process for H 2 O 2 synthesis. Rational design of earth-abundant electrocatalysts for H 2 O 2 synthesis via a two-electron ORR process in acids is attractive but still very challenging. In this work, we report that nitrogen-doped carbon nanotubes as a multi-functional support for CoSe 2 nanoparticles not only keep CoSe 2 nanoparticles well dispersed but alter the crystal structure, which in turn improves the overall catalytic behaviors and thereby renders high O 2 -to-H 2 O 2 conversion efficiency. In 0.1 M HClO 4 , such CoSe 2 @NCNTs hybrid delivers a high H 2 O 2 selectivity of 93.2% and a large H 2 O 2 yield rate of 172 ppm·h −1 with excellent durability up to 24 h. Moreover, CoSe 2 @NCNTs performs effectively for organic dye degradation via electro-Fenton process.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）