INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuying Jiang,Xibin Zhou,Yifeng E,Pengyan Wei,Peng Chen,Li Li,Zhuozhe Li,Thomas F. Krenzel,Kun Qian
The design and synthesis of novel electrode catalysts is an applicable strategy to improve the performance of direct methanol fuel cells (DMFCs). The catalyst is composed of molybdenum disulfide as the shell and nickel silicide-doped sodalite (MoS 2 /NiSi@SOD) as the core. A series of characterization results indicate that NiSi is highly dispersed in the nanosized SOD cage on the surface of the SOD zeolite at the crystal faces of (011), (102), and (201). A thin conductive protective cover is formed by MoS 2 on the surface of the zeolite . By the cyclic voltammetry (CV), the catalyst performs a maximum current density of 46.9 mA cm −2 (1250.1 A g Ni −1 ) with 10 M methanol while no remarkable catalyst poisoning and catalyst deactivation are observed. It is revealed that MoS 2 /NiSi@SOD under high catalysis activity protects the Ni from the drain in the alkaline electrolyte , leading to a broad application prospect as a noble-metals-free DMFC catalyst.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yannan Hai,Ying Chang,Jingchun Jia,Aiju Xu,Meilin Jia
Glycerol electrooxidation (GOR) is a safe and clean method for conversion of glycerol. In the course of this work, a series of Pt x Ce/C catalysts have been synthesized by successive polyol reduction methods as well as etching and calcination . Various physicochemical characterrisation and electrochemical measurements have demonstrated the excellent performance of Pt 3 Ce/C composites in glycerol oxidation (GOR) and hydrogen evolution reactions (HER). The Pt 3 Ce/C catalyst showed better performance in GOR and HER compared to commercially available Pt/C electrocatalysts . This paper demonstrates an energy efficient electrocatalyst for the simultaneous precipitation of hydrogen from glycerol oxidation.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 8
·e202202059
·
IF 8.4
Xiang Zhong,Yuxiang Zhu,Meng Jiang,Qiufan Sun,Jianfeng Yao
Graphical Porous photocatalyst : A triazine/heptazine-based carbon nitride homojunction with chloride doping was prepared using a simple, one-step photochemical synthesis route and utilized as highly efficient photocatalytic overall water splitting. The dual-phase ratio, morphology, and electronic structure of the isotype junction were finely tuned through UV illumination time and washing solvents. Porous triazine-/heptazine-based carbon nitride (THCN) homojunction with chloride (Cl) doping was synthesized by a simple, one-step photochemical synthesis route for efficient visible-light-driven overall water splitting. The phase ratio of triazine-based carbon nitride (TCN) and heptazine-based carbon nitride (HCN), texture and morphology of the THCN isotype junction were finely tuned by varying ultraviolet irradiation time and washing solvents. After washing with acetonitrile, the resulting porous THCN nanosheets with 48 h irradiation contain 21 wt % TCN and 79 wt % HCN units and reveal a significantly improved photocatalytic performance with H 2 and O 2 production rates up to 7.9 and 4.2 μmol h −1 , respectively, about 3.8 times higher than that of THCN prepared by 36 h illumination. The dual-phase interaction, holey structure, and Cl dopants favor the exposure of active sites, extended visible-light harvesting, accelerated charge transfer, and enhanced photoreduction ability, thereby improving photocatalytic activity.
✓ 已验证
产品关联
DOI
PubMed
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 .
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 1
·31
·
IF 4.2
Xilai Lu,Menghan Wu,Yong Huang,Jiannan Song,Yong Liu,Zhiqiao Yan,Feng Chen,Jieting Zhao,Wanping Chen
The slight but cumulative influence of impurity gases in air poses a great threat to the long-term stability of room-temperature gas sensors. Room-temperature hydrogen-sensitive Pt–SnO2composite nanoceramics of 5 wt% Pt were prepared through pressing and sintering. The response of a sample was over 10,000 after being exposed to 500 ppm H2S–20% O2–N2at room temperature, and the room-temperature hydrogen sensing capacity was seriously degraded even for samples that had aged dozens of days since H2S exposure. Mild heat treatments such as 160 °C for 10 min were found able to fully activate those H2S-exposed samples. As the peak of S 2p electron was clearly detected in H2S-exposed samples, it was proposed that for room-temperature hydrogen-sensitive Pt–SnO2composite nanoceramics, H2S exposure induced degradation results from the poisoning of Pt by H2S deposited on it, which can be removed through a mild heat treatment. Periodic mild heat treatment should be a convenient and effective measure for room-temperature metal oxide gas sensors to achieve long-term stability through preventing the accumulation of impurity gases in air deposited on them.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Manrong Shen,Xiufang Lin,Wenhao Xi,Xiaojin Yin,Bifen Gao,Liwen He,Yun Zheng,Bizhou Lin
Rational design and facile preparation of high-performance carbon-based eletrocatalysts for both oxygen reduction and evolution reactions (ORR and OER) is crucial for practical applications of rechargeable zinc-air batteries. Inspired by the fact that the metallic Co catalysis on the formation of carbon nanotubes (CNTs), this work develops a facial compression-pyrolysis route to synthesize a mesoporous waffle-like N -doped carbon framework with embedded Co nanoparticles (Co@pNC) using a Co metal–organic framework and melamine as precursors. The unique porous waffle-like carbon framework is built up of interwoven N -doped CNTs and graphene nanosheets , which offers abundant catalytic-active sites and rapid diffusion channels for intermediates and electrolyte. The optimized Co@pNC shows excellent bifunctional ORR/OER electrocatalytic activity in alkaline media with a half-wave potential ( E 1/2 ) of 0.85 V for ORR and a small potential gap of 0.70 V between ORR E 1/2 and OER potential at 10 mA cm −2 . Its assembled battery exhibits a peak power density up to 150.3 mW cm −2 , an energy density of 928 Wh kg Zn -1 and superb rate capability. It highlights a facile component and architecture strategy to design high-performance carbon-based eletrocatalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shiwei Song,Yanhui Wang,Xueqing Tian,Fanjia Sun,Xiaoxu Liu,Yungang Yuan,Wei Li,Jianbing Zang
For sustained hydrogen generation from seawater electrolysis, an efficient and specialized catalyst must be designed to cope with the slow anode reaction and chloride ions (Cl - ) corrosion. In this work, an S-modified NiFe-phosphate with hierarchical and hollow microspheres was grown on the NiFe foam skeleton (S-NiFe-Pi/NFF), acting as a bifunctional catalyst to enable industrial-scale seawater electrolysis. The introduction of S distorted the lattice of NiFe-phosphate and regulated the local electronic environment around Ni/Fe active metal, both of which enhanced the electrocatalytic activity. Additionally, the existence of phosphate groups repelled Cl - on the surface and enhanced corrosion resistance, enabling stable long-term operation in seawater. The double-electrode electrolyzer composed of the hollow-structured S-NiFe-Pi/NFF as both cathode and anode exhibited a potential of 1.68 V at 100 mA cm −2 for seawater electrolysis. Particularly, to achieve industrial requirements of 500 mA cm −2 , it only required a low cell voltage of 1.8 V and demonstrated a consistent response over 100 h, which outperformed the pair of Pt/C || IrO 2 . This study provides a feasible idea for the preparation of electrocatalysts that are with both highly activity and corrosion resistance, which is crucial for the implementation of industrial-scale seawater electrolysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 12
·1525
·
IF 4.501
Sai Che,Na Ta,Fan Yang,Yulong Yang,Yongfeng Li
Rational design and construction of cost–effective electrocatalysts for efficient hydrogen production has attracted extensive research attention worldwide. Herein, we report the construction of a transition metal selenide/carbon composite catalyst featuring uniform NiSe nanoparticles anchored to single Ni atom doped porous carbon structure (NiSe/Ni–N–C) via a facile one–pot pyrolysis of low–cost solid mixtures. NiSe/Ni–N–C exhibits remarkable catalytic performance towards hydrogen evolution reaction (HER) in 1.0 M KOH, requiring a low overpotential of 146 mV to reach a current density of 10 mA cm−2. The unique carbon layer encapsulation derived from the enwrapping of fluid catalytic cracking slurry further renders NiSe/Ni–N–C excellent for long–term durability in electrolyte corrosion and nanostructure aggregation. This work paves the way for the design and synthesis of highly efficient composite HER electrocatalysts.Keywords:NiSe nanoparticle;single atom catalyst;interfacial electronic engineering;hydrogen evolution reaction
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2023
·Vol. 9
·期 3
·e202200521
·
IF 3.8
Xinjie Guo,Xingyu Gan,Yun Wang,Xiaoxia Lv,Fengxiang Wang,Shuxin Wang,Shan Peng
Graphical A Co/CoO@NC/CNT-10 catalyst was effectively synthesized using melamine-assisted pyrolysis with Co-MOF as the precursor. With the synergistic effect of metal species, oxygen defects and N-doped carbon nanotubes, the intrinsic activity and electron transfer ability of the catalysts were greatly improved, showing excellent electrocatalytic oxygen reduction performance. Low-cost and high-efficiency oxygen reduction reaction (ORR) electrocatalysts are the basis for large-scale applications of electrochemical energy storage and conversion technologies such as fuel cells and metal-air batteries. Herein, cobalt and oxygen vacancy-rich cobalt oxide encapsulated in nitrogen-doped carbon and carbon nanotubes (Co/CoO@NC-CNTs) have been prepared by direct solid-state pyrolysis of Co-MOF. The carbon morphology, oxygen vacancy content and type of nitrogen can be finely tuned by mixing Co-MOF with proper amounts of melamine. The optimized material has an interwoven CNT structure with abundant micro- and mesopores, suitable nitrogen type and certain number of oxygen vacancies and exhibiting outstanding ORR electrocatalytic performance in alkaline media with an onset potential of 0.96 V and a half-wave potential of 0.88 V vs RHE, which is higher than 20 wt% Pt/C, as well as being highly stable and well resistant to methanol.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yihui Wu,Zesheng Sun,Yuxin Wang,Li Yin,Zhen He,Zejie Zhang,Muhammad D. Hayat,Qianhao Zang,Jiqiong Lian
The development of efficient and low-cost bifunctional electrocatalysts for hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) is highly challenging in urea-water-alkali electrolyzers. Herein, nickel-selenium electrocatalysts (denoted as Ni-Se) were controllably grown on Ni foam by a facile and simple cyclic voltammetric electrodeposition for overall urea electrolysis. Considering the good conductivity and high hydrophilic surface of Ni-Se@NF, the optimized Ni-Se electrocatalyst exhibited the eminent HER and UOR catalytic competence. In 1 M KOH with 0.33 M urea electrolyte, Ni-Se electrocatalysts required an overpotential of 181 mV for HER and potential of 1.347 V versus reversible hydrogen electrode for UOR to achieve a current density of 10 mA·cm −2 . Additionally, the electrocatalyst showed good durability in both HER and UOR. Moreover, the electrolyzer assembled by Ni-Se electrocatalysts as electrode couple exhibited a remarkable activity with a small cell voltage of 1.41 V to reach 10 mA·cm −2 for overall urea-water electrolysis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qing-Qing Pang,Xue Bai,Xin Du,Shuo Zhang,Zhong-Yi Liu,Xin-Zheng Yue
Constructing highly active electrocatalysts towards hydrogen evolution reaction (HER) in both alkaline and acidic media is essential for achieving a sustainable energy economy. Here, a facile ethylene glycol reduction strategy was employed to design the nickel-ruthenium nanocrystals (Ni-Ru NC) with an exposed highly active Ru (1 0 1) facet as an efficient electrocatalyst for HER. Testings show Ni-Ru NC outperforms the benchmark catalyst Pt/C by delivering extraordinarily low overpotentials of 21.1 and 70.9 mV to drive 10 mA cm −2 in acidic and alkaline solutions, respectively. The results of experimental and theoretical studies suggest that Ni can modulate the electronic structure of the Ru NC and optimize the hydrogen adsorption free energy on Ru’s surface, which accelerates the charge transfer kinetics and enhances the HER performance. The study support the potential application of facet-modulated Ru-based HER eleccatalyst in an alkaline environment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2022
·Vol. 220
·期 2
·2200581
·
IF 2.17
Linlin Dang,Kai Zhang,Qiguan Wang,Changhua Xu,Sumin Wang
Active bifunctional electrocatalysts for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are badly required for high-efficiency zinc–air batteries (ZABs). Herein, a Fe-alloyed MoNi nanohybrid (MoNiFe) as bifunctional catalyst is reported. The alloyed MoNiFe architecture with the decreased size compared with MoNi is obtained by a hydrothermal reduction method, which enhances the exposed active sites and promotes the charge transfer. Accordingly, MoNiFe exhibits good bifunctionality, with a positive half-wave potential (0.896 V) near Pt/C (0.812 V) in ORR reaction and a low overpotential (0.295 V) similar to IrO 2 (0.29 V) in OER process. The as-derived rechargeable ZAB cells based on the bifunctional MoNiFe catalyst show the peak power density of 58 mW cm −2 with a high open-circuit voltage of 1.319 V. Thus, this work paves a new alloying avenue for synthesizing effective bifunctional electocatalysts for ZABs.
✓ 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）