JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Dongfeng Sun,Songmin Lin,Yuan Yu,Fangyou Meng,Gaohui Du,Bingshe Xu
It is still challenging to design and synthesize highly efficient and noble-metal-free electrocatalysts for hydrogen/oxygen evolution reaction (HER/OER). Herein, we developed an in-situ phosphating Co@nitrogen-doping graphene to obtain N and P co-doped carbon-coated cobalt phosphide (CoP@N,P C) that could be used for overall water splitting. The unique 3D porous structure of CoP@N,P C is characterized by a large number of active catalytic sites. High wettability of catalyst in electrolyte solution facilitates the transfer of ions. The synergism between the CoP cores and N, P C shells improves the total hydrolysis performance of the electrocatalyst during the HER and OER. At the current densities of 10 mA/cm 2 (1 M of KOH), the HER overpotential recorded for the CoP@N,P C is 113 mV, and the OER overpotential is 320 mV. The cell voltage of the CoP@N,P C as bifunctional electrode for overall water splitting is 1.67 V (at 10 mA/cm 2 ), which is close to that of the full noble-metal electrode (RuO 2 || Pt/C, 1.58 V). The CoP@N, P C bifunctional catalyst can be potentially used to replace noble-metal electrodes to realize 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
Journal of Energy Chemistry
·
2019
·
IF 5.162
Jun-Feng Qin,Jia-Hui Lin,Tian-Shu Chen,Da-Peng Liu,Jing-Yi Xie,Bao-Yu Guo,Lei Wang,Yong-Ming Chai,Bin Dong
Adjusting the intrinsic activity and conductivity of electrocatalysts may be a crucial way for excellent performance for water splitting. Herein, the rational design of vanadium element doped cobalt phosphide (V-doped CoP) nanoparticles has been investigated through a facile gaseous phosphorization using cobalt vanadium oxide or hydroxide (Co-V hydr(oxy)oxide) as precursor. The physical characterization shows that the homogeneous dispersion of V element on V-doped CoP nanoparticles have obtained, which may imply the enhanced electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The electrochemical measurements of the prepared V-doped CoP in alkaline electrolyte demonstrate the superior electrocatalytic activity for both HER (overpotential of 235 mV@10 mA cm −2 ) and OER (overpotential of 340 mV @10 mA cm −2 ). Further, V-doped CoP nanoparticles used as anode and cathode simultaneously in a cell require only 370 mV to achieve a current density of 10 mA cm −2 . The outstanding electrocatalytic activity may be ascribed to the improved conductivity and intrinsic activity owing to phosphating and the doping of V element. In addition, the long-term stability of V-doped CoP has been obtained. Therefore, metal doping into transition metal-based phosphides may be a promising strategy for the remarkable bifunctional electrocatalyst for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Suci Meng,Pengfei An,Lijie Chen,Shichao Sun,Zhongkai Xie,Min Chen,Deli Jiang
Developing high-efficient and low-cost photocatalysts is of great significance yet challenging for photocatalytic hydrogen evolution. Herein, we report a 2D/2D Ru-modulated CoP nanosheets (Ru-CoP -x , where x refers the Ru-to-Co molar ratio)/g-C 3 N 4 nanosheets (GCN NSs) ternary hybrid as a photocatalyst for hydrogen evolution under visible light. The optimal photocatalyst 25% Ru-CoP-1:8/GCN NSs exhibits an excellent hydrogen evolution rate of 1172.5 µmol g −1 h −1 under visible light with a high apparent quantum efficiency (AQE) of 3.49% at 420 nm, which is close to Pt/g-C 3 N 4 photocatalytic system and higher than most reported transition metal phosphides (TMP)/g-C 3 N 4 photocatalytic system. Experimental results indicate that the higher photocatalytic hydrogen evolution performance can be mainly attributed to the binary Ru-CoP -x co-catalyst with efficient charge separation and promoted surface water reduction kinetics, and the 2D/2D self-assembly structure with strong interface Schottky effect and short charge transport distance. This study provides a new approach to develop cost-effective Pt-alternative co-catalysts for photocatalytic hydrogen evolution by incorporating a small amount of ruthenium into the transition metal phosphides.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 35
·期 6
·065704
·
IF 3.5
Xiaomei Yu,Wei Shi,Jiajiao Wei,Tiantian Liu,Yuanyuan Li,Mengyuan He,Zhengyu Wei,Dehai Ping,Panfei Sun,Jin You Zheng,Songjie Li
Developing non-noble-metal electrocatalysts for hydrogen evolution reactions with high activity and stability is the key issue in green hydrogen generation based on electrolytic water splitting. It has been recognized that the stacking of large CoP particles limits the intrinsic activity of as-synthesized CoP catalyst for hydrogen evolution reaction. In the present study, N-MoxC/CoP-0.5 with excellent electrocatalytic activity for hydrogen evolution reaction was prepared using N-MoxC as decoration. A reasonable overpotential of 106 mV (at 10 mA cm−2) and a Tafel slope of 59 mV dec−1 in 1.0 M KOH solution was achieved with N-MoxC/CoP-0.5 electrocatalyst, which exhibits superior activity even after working for 37 h. Uniformly distributed ultrafine nanoclusters of the N-MoxC/CoP-0.5 hybrids could provide sufficient interfaces for enhanced charge transfer. The effective capacity of the hydrogen evolution reaction could be preserved in the complex, and the enlarged electrocatalytic surface area could be expected to offer more active sites for the reaction.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhijie Zhang,Simin Chen,Sipeng Chen,Zeyu Yuan,Yanxiong Fang,Dai Dang,Yuying Zheng
Designing an electrocatalyst for hydrogen production from water splitting that is highly efficient, stable, and free of noble metals is necessary but challenging. The phosphorus compound is considered a viable candidate for producing hydrogen from water split, but its electrocatalytic performance needs further improvement. Herein, we present an easy and straightforward method for constructing Mn-doped Co 2 P yolk-shell lychee spheres. The Co nano prisms are used as a self-sacrificing template to conduct an ion exchange reaction with manganese ions, constructing Co oxide yolk-shell spheres with Mn–Co hydroxide nano-blocks. After in-suit phosphating at low temperature, Mn-doped Co 2 P with yolk-shell structure and lychee morphology is formed. The Mn-doped Co 2 P with an optimized Mn and Co molar ratio (0.125) exhibits excellent hydrogen evolution performance in alkaline and acidic electrolyte. The overpotentials can reach 10 mA cm −2 at 98 mV and 72 mV, respectively, and the Mn–Co 2 P-0.125 catalyst has faster electron transfer efficiency and larger electrochemically active surface area. The experimental results ascertain that doping an appropriate amount of Mn significantly changes the morphology and structure, thereby affecting the exposure of active sites, and modulating the electronic structure around Co 2 P. Under the dual regulation of morphology and electronic structure, the electrocatalytic process is accelerated, enhancing its catalytic activity .
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peilin Wu,Lin Gao,Liuyan Dong,Zihan Lin,Lili Cui
To prepare bifunctional electrocatalyst towards HER and OER is extremely important for promoting the development of electrochemical water splitting technology. Herein, the element doping method is employed to tune the electron environment of cobalt phosphide (CoP). The Mo-doped CoP supported on carbon cloth (CC) is constructed by solvothermal and annealing method. The effect of Mo on the electron modulation of CoP during different phosphating time was studied carefully. It is noted that the Mo play an important role in tuning the electron state of Co and P elements which can trap the electron and was reduced to low valence, then transfer the electron to Co and P. With increasing the phosphating time, the electron transfer phenomenon between Mo and CoP is obvious. Benefiting from the electron engineering of Mo, Co and P as well as thin and wrinkle sheets structure, the optimal electrocatalyst only requires 39 mV and 251 mV to deliver 10 mA cm −2 for HER and OER, respectively. Also, as for the whole water splitting performance, it delivers 10 mA cm −2 at cell voltage of 1.56 V. Importantly, Faraday efficiency of the optimal catalyst achieves 99.9% for HER due to the tuned electron state of Co and P, high ECSA and low R ct .
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiang Li,Lu Wang,Ruiying Li,Ming Ke,Ying Zhou,Jian Liu
Developing efficient and economical electrocatalysts for hydrogen evolution reaction (HER) over a broad pH range has received considerable attention. In this work, we prepared multi-dimensional MoS 2 /S-CoP heterojunction catalysts by utilizing the carbon clothes supported ZIF-67 array as templates combining with Mo-ion exchange and high-temperature phosphorization-sulfidation strategy. The introduction of MoS 2 into S-CoP results in electron redistribution and the formation of a distinctive space charge region at the two-phase contact interface, thereby effectively tuning surface properties, enhancing electron conductivity, and improving electrocatalytic activity. According to Density Functional Theory (DFT) calculations, the introduction of MoS 2 is advantageous for the adsorption and desorption of H*, resulting in the value of ΔG H* very close to zero. Furthermore, the adsorbed water molecules are more readily activated, rendering the ΔG H2O-dis decrease, thus significantly promoting HER activity. These features contribute to robust HER electrocatalytic performance in a wide pH range and even in seawater, which is also beneficial for industrial applications. In particular, MoS 2 /S-CoP exhibits superior HER performance in alkaline seawater, requiring only 197 and 228 mV to reach the current densities of 100 and 200 mA cm -2 , respectively. This study offers novel perspectives on high-performance heterostructures for HER electrocatalysts in alkaline seawater environments.
研究领域:
材料科学
·
电化学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Si Ye,Yufeng Wang,Bohao Du,Lei Cheng,Lixian Sun,Puxuan Yan
The design of an efficient and reusable monolithic catalyst is important for catalyzing the hydrolysis of NaBH 4 to generate H 2 . Herein, an aerogel catalyst was prepared by freeze-drying of hydrazine modified cellulose nanofibers (NH 2 NH-CNF), polyvinyl alcohol (PVA) and B-doped CoP loaded sepiolite nanofibers. Further chemical cross-linking using glutaraldehyde (GA) resulted in better mechanical properties and shape recovery. Among them, the catalytic active component B-CoP@aSep has a low activation energy of 35.7 KJ·mol −1 . In addition, the optimized composite aerogel catalyst can get hydrogen generation rate ( 3534 m L m i n - 1 g c a t a l y s t - 1 ), which was maintained at 79.4% even after 5 cycles of testing. The better mechanical and catalytic properties of aerogel catalysts are mainly attributed to the overall three-dimensional layered porous structure maintained by chemical bonds and the heterogeneous interface formed by B-doped CoP.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shi Feng Zai,Yu Han Wu,Yi Tong Zhou,Zhao Tian Hui Li,Chun Bin Guo
Rational design of low-cost and high-efficiency electrocatalysts for hydrogen evolution reaction (HER) is critical for scalable and sustainable hydrogen production from economical water-alkali splitting. Herein, density functional theory (DFT) calculations reveal that coupling NiO x and CoP could effectively boost overall HER kinetics through lowing the H 2 O dissociation barrier, accelerating the OH* transfer process, and providing the rapid H* migration kinetics as well as the appropriate H* energetics. Based on these findings, we successfully prepared a three-dimensional (3D) self-supported electrode of ultrathin CoP nanosheets directly grown on the surface-oxidized Ni nanotube arrays via a simple and scalable electrochemical synthesis method. As expected, such a heterostructure electrode exhibits superior alkaline HER performance with low overpotentials of 51 and 164 mV to drive the current densities of 10 and 500 mA cm −2 , respectively, outperforming most of the efficient alkaline HER electrocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 6
·2826-2832
·
IF 2.2
Nan Jue,Liao Haiyang,Ye Beirong
The quest for electrocatalysts that are both stable and efficient for seawater oxidation is intriguing yet presents significant challenges. Herein, we present a hierarchical NiFe-LDH@CoP core–shell array on carbon cloth (NiFe-LDH@CoP/CC) for efficient oxygen evolution reaction (OER) in an alkaline seawater electrolyte. The NiFe-LDH@CoP/CC array exhibits remarkably low overpotential of 251 mV to achieve current density of 500 mA cm −2 . Moreover, it features a modest Tafel slope of 24.9 mV dec −1 . Importantly, this electrocatalyst sustains its robust stability during continuous electrolysis for 300 h at 500 mA cm −2 . The outstanding performance and unique hierarchical structure of the NiFe-LDH@CoP/CC array provides innovative insights for the development of efficient electrocatalysts tailored for seawater oxidation applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yihua Cao,Xueli Yin,Yonghao Gan,Ying Ye,Run Cai,Bo Feng,Qi Wang,Xiaoping Dai,Xin Zhang
Designing bifunctional electrocatalysts with high efficiency and low cost for water splitting is urgently required for the production of green hydrogen. Herein, a bifunctional iron-doped cobalt borate/cobalt phosphide hybrid supported on nickel foam (Fe-CoB i /CoP/NF) was fabricated via hydrothermal and phosphating process. Benefit from the unique nanoneedle architecture for faster mass transfer, the existence of borate on CoB i for accelerating proton transfer , the moderate adsorption of H* species on CoP, Fe doping and the synergistic effect between CoB i and CoP, Fe-CoB i /CoP/NF hybrid exhibits a low overpotential of 137 mV and 260 mV at 100 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Moreover, Fe-CoB i /CoP/NF||Fe-CoB i /CoP/NF also presents a low cell potential of 1.65 V@100 mA cm −2 for overall alkaline water splitting and excellent durability (128 h) without decay. This work provides a new insight into the design of bifunctional electrocatalysts simultaneously through the morphological engineering and heteroatomic doping.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yanyan Ma,Hongwei Zhang,Haofei Cong,Yuxiao Wang,Shuwen Xin,Peilong Xu,Yuanbin Qin,Guangxu Xu,Xiaochan Kang,Fengyun Wang
Transition metal phosphides (TMPs) are considered satisfactory anode candidates for sodium-ion batteries (SIBs) due to their high energy density and modest plateau. However, the TMPs anode suffers from poor cycling and rate properties owing to the negative effects of severe volumetric expansion and sluggish reaction kinetics. Herein, a novel structure of porous core/shell CoP@N-C nano polyhedral embedding on 2D MXene nanosheets (CoP@N-C/MXene) was synthesized by self-assembly and in-situ phosphorization methods. The porous CoP@N-C with the unique core/shell structure benefits the infiltration of electrolytes and alleviates the volumetric change. Besides, high-conductive 2D MXene nanosheets could enhance electrical conductivity and charge transfer kinetics, and effectively inhibit CoP@N-C pulverization and agglomeration. Based on the above advantages, the as-prepared CoP@N-C/MXene anode delivers an excellent cycling capacity, outstanding rate capability and low-temperature high-rate capability. This synthetic strategy of CoP@N-C/MXene architecture can be extended to other materials which are promising for SIBs electrodes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）