JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 19
·期 1
·229-239
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IF 2.234
Zhang J. L.,Liu H. D.,Huang L. H.,Tan S. Z.,Mai W. J.,Cai X.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide (rGO&Ni(OH) 2 ) was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The results showed that the agglomeration and re-stacking of rGO could be effectively prevented, resulting in few-layer rGO nanosheet with high specific surface area of 891.22 m 2 /g which could supply large available area for loading nanoparticle. After the incorporation of Ni(OH) 2 nanoparticle, the rGO&Ni(OH) 2 composite owned excellent electrochemical performance thanks to effective prevention of agglomeration and re-stacking of rGO with large size of the sp 2 domain, no residual of pre-stabilizer of ammonia, and tight contact between rGO and Ni(OH) 2 . Specifically, the rGO&Ni(OH) 2 electrode exhibited excellent stability at scan rates from 100 to 300 mV/s. A high specific capacitance of 1,008 F/g was obtained at high current density of 42 A/g in 6 mol/L KOH aqueous electrolyte, and the specific capacitance demonstrated good rate capability. Moreover, rGO&Ni(OH) 2 electrode showed a long cycle life, retaining 74 % specific capacitance after 2,000 cycles at current density of 6 A/g. The advantages of easy process and excellent electrochemical property suggested great potential application of rGO&Ni(OH) 2 in supercapacitors.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The obtained material owned excellent electrochemical property, including high capacitance, good rate capability, excellent stability, long cycle life, etc.
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ADVANCED POWDER TECHNOLOGY
·
2017
·
IF 2.659
Wenle Ma,Yongmei Feng,Li Wang,Yanhong Li,Min Shi,Hongtao Cui
In this work, we report the preparation of Co 2 (OH) 3 Cl nanoparticles with average size of ∼20 nm and well-defined cubic shape at room temperature by an epoxide precipitation route. It was found that the as-prepared Co 2 (OH) 3 Cl nanoparticles could be used as a promising new electrode material for application in redox supercapacitors due to its high electrochemical performance. It presented superior specific capacitance of 783 F g −1 at low current density of 2.8 A g −1 , while it had a high value of 604 F g −1 at high current density of 56.6 A g −1 , proving its excellent high rate performance. Its 75% capacitance retention after 10,000 cycles of charge–discharge demonstrated its long-life span. According to characterization results, the possible mechanism for the electrochemical process that Co 2 (OH) 3 Cl nanoparticles underwent was proposed as a process of Co 2 (OH) 3 Cl → β-Co(OH) 2 → CoOOH ↔ Co 3 O 4 .
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RSC Advances
·
2015
·Vol. 6
·期 6
·4329-4334
·
IF 3.84
Jikui Wang,Jiahong Guo,Pengxiang Si,Wanping Cai,Yuming Wang,Genhua Wu
An In(OH)3–PDMS sponge has been synthesized by covalent modification of PDA. The sponge can switch surface wettability reversibly between superhydrophobicity and superhydrophilicity when detecting ammonia. The water contact angle changes from 141.5° to 0° after storage in an ammonia atmosphere, which means an ammonia responsive surface wettability switch. The minimum NH3·H2O concentration that the In(OH)3–PDMS can detected is 5% in 2 h. This kind of quick and sensitive ammonia detector is promising simply by virtue of the surface wettability conversion.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Ting Yu,Ying Liang,Zejun Zhou,Fengjie Chen,Yingjun Wang,Yunjun Mei,Mengxi Cao,Bolei Chen,Pu Wang,Yawei Wang
The photocatalytic generation of hydrogen peroxide (H 2 O 2 ) using artificial synthetic methods is promising. However, the sluggish hole-induced water oxidation half-reaction that hinders charge separation severely limits H 2 O 2 generation efficiency. This study used the oxidation half-reaction of tetracycline (C 22 H 24 N 2 O 8 , TC) to accelerate charge separation over GaOOH/In(OH) 3 composites with Type II heterojunctions under sunlight irradiation to increase the H 2 O 2 generation efficiency. The results demonstrated that the H 2 O 2 generation efficiency significantly increased from 74.7 to 389.8 µmol L −1 h −1 as the TC degradation efficiency increased from 0.02 to 0.37 mg L −1 h −1 . Radical quenching experiments further indicated that TC degradation consumed holes, increasing the electron formation rate and enhancing H 2 O 2 generation. A comparison with density functional theory calculations revealed that H 2 O 2 generation was a one-step 2-electron route (O 2 + 2e − + 2H + → H 2 O 2 ). These findings are expected to provide new strategies for promoting photocatalytic synthesis of H 2 O 2 .
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ChemSusChem
·
2024
·
IF 7.5
Yue Qin,Qingli Xu,Rong Zhao,Qingfa Wang
Graphical Hybrid NiS/Ni(OH) x catalyst containing abundant heterointerfaces and appropriate oxygen vacancies show excellent oxygen evolution reaction (OER) activity and stability. The oxygen vacancies can be easily regenerated to recover the OER performance after the stability test. A mechanism of oxygen vacancies transformation and regeneration based on the Ni-S-5 catalyst is proposed. Developing low-cost and highly efficient electrocatalysts toward oxygen evolution reaction (OER) is of vital significance for electrochemical water splitting. Herein, we fabricate a heterostructure NiS/Ni(OH) x electrocatalyst (Ni-S-n) with regenerative oxygen vacancies via electro-deposition on nickel foam (NF) followed by a facile NaBH 4 reduction. The resulting Ni-S-5 catalyst with appropriate amount of oxygen vacancies (O vs ) exhibits extraordinary activity for alkaline OER with overpotential of 142 mV and 248 mV to reach the current density of 10 mA cm −2 and 100 mA cm −2 , respectively. This catalyst also shows remarkable durability with 40 h. After the stability test, the excellent OER performance is well recovered by regenerating the surface oxygen vacancies (O vs ) significantly with additional NaBH 4 reduction. The Ni-S-5 catalyst still displays good activity even after repeating it three times (180 h). The surface oxygen vacancies act as vital active sites for OER. A mechanism of O vs species transformation and regeneration based on the Ni-S-5 catalyst is proposed, which provides a new direction for exploring ultrastable and efficient OER electrocatalysts with renewable active species.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhou Yuan,Le Han,Yuchi Zhang,Lufang He,Peng Liu,Yan Xu
Self-assembled inorganic metal halide perovskite composites with high emitting efficiency, tunable multimode emission and stimuli-responsive luminescence demonstrated great potential in diversified luminescence applications. Here, a novel CsPbBr 3 /EuWO 4 (OH) composite was successfully prepared through the surface adsorption of Pb 2+ ions on hydroxylated EuWO 4 (OH) microsheets and subsequent nucleation of CsPbBr 3 peroviskite quantum dots (PQDs) by the anti-solvent crystallization in CsBr containing N,N-dimethylformamide (DMF) solution. Due to the distinct fluorescent thermochromic switching properties of temperature-insensitive Eu 3+ and sensitive CsPbBr 3 PQDs emitting centers, the resultant CsPbBr 3 /EuWO 4 (OH) composite exhibits excellent ratiometric temperature sensing performance. The CsPbBr 3 /EuWO 4 (OH) thermometer based on the fluorescence intensity ratio (FIR) technique originating from emissions of Eu 3+ to CsPbBr 3 PQDs was then explored with a high temperature sensitivity (S r ) of 5.8 % ℃ −1 at 54 ℃. In addition, a high-security-level information encryption scheme was proposed by utilizing the excitation-wavelength-dependent switchable fluorescence of CsPbBr 3 /EuWO 4 (OH) composite. This study provides a simple and feasible strategy for assembling dual-emission CsPbBr 3 /EuWO 4 (OH) composite, showing potential applications in optical ratiometric thermometry and information encryption fields.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Aoqi Tang,Pei Zhu,Wen Zhang,Zhongbin Zhuang,Shuang Yao,Changhua An
Developing efficient nickel–iron-based electrocatalysts for the oxygen evolution reaction (OER) still remains a challenge for long-term application in water electrolysis. Herein, amorphous Ni2Fe hydroxide nanosheets with self-healing active centers supported on stainless steel mesh (a-Ni2Fe(OH)x/SSM) are fabricated using a simple electrochemical deposition strategy. In situ Raman evidence shows that the amorphous structure of a-Ni2Fe(OH)x/SSM exhibits strong self-healing ability, efficiently promoting the rapid interconversion between the γ-NiOOH intermediate and Ni-based hydroxides during electrocatalysis. As a result, the as-obtained a-Ni2Fe(OH)x/SSM exhibits a low overpotential of 247 mV at 100 mA cm–2 and robust electrochemical stability for 200 h. Moreover, an anion-exchange membrane electrolyzer for water splitting is assembled utilizing a-Ni2Fe(OH)x/SSM as the anode, and current densities of 500 and 1000 mA cm–2 are achieved at 1.62 and 1.72 V, respectively, with stable performance at 500 mA cm–2 over 30 h. This work provides a facile approach for designing amorphous catalysts for various useful reactions.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Wang Ruilin,Luo Hao,Duan Chengyu,Liu Huimin,Sun Mengdi,Zhou Quan,Ou Zheshun,Lu Yinglong,Luo Guanghui,Yu Jimmy C.,Hu Zhuofeng
Water oxidation presents a promising avenue for hydrogen peroxide (H 2 O 2 ) production. However, the reliance on alkaline bicarbonate electrolytes as an intermediate has limitations, such as H 2 O 2 decomposition and a narrow pH effectiveness range (7–9), restricting its utility across wider pH ranges. This study unveils a crystal OH mediating pathway that stabilizes SO 4 OH* as a crucial intermediate. Basic copper carbonate (Cu 2 (OH) 2 CO 3 ) tablets, commonly found on cultural relics, exhibit the capability to generate H 2 O 2 in neutral or acidic non-bicarbonate electrolytes. By leveraging this crystal OH mediating strategy, considerable H 2 O 2 production in Na 2 SO 4 electrolytes is achievable. Notably, the H 2 O 2 production rate can reach 64.35 μmol h −1 at 3.4 V vs. RHE in a 50 mL 0.5 M Na 2 SO 4 electrolyte. This research underscores the importance of crystal part in catalyst in catalyzing the 2e − water oxidation reaction, offering valuable insights for future investigations.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yaohao Zhang,Kaifen Luo,Lijuan Peng,Jiahuan Zhong,Chengkai Zhang,Dingsheng Yuan
Compared to a single heterostructure , constructing multiple heterojunction interfaces to enhance bifunctional catalytic activity still faces challenges. Herein, a nanoflower-like electrocatalyst with multiple heterojunction interfaces, which consists of MoO 3 , V 2 O 5 , and Ni(OH) 2 in-situ grown on nickel foam, is prepared through a one-step hydrothermal method (MoO 3 /V 2 O 5 /Ni(OH) 2 /NF, named MVN/NF). The MVN/NF exhibits superior catalytic performance, attributable to enhanced electron transfer facilitated by numerous heterojunction interfaces, a substantial active specific surface area , and a self-supported architecture. It requires low potentials for hydrogen evolution reaction , urea oxidation reaction , and overall urea electrolysis of 81 mV, 1.351 V, and 1.450 V (vs. RHE), respectively, to reach a current density of 10 mA cm −2 . By cutting the material into a large-scale electrode for use in an alkaline electrolyzer , its Faraday efficiency was 90.0%, and the urea decomposition rate reached 45.1%. This work offers broad application prospects for the realization of large-scale hydrogen production and the decomposition of urea-containing wastewater.
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International Journal of Electrochemical Science
·
2024
·
IF 1.3
Dandan Liang,Weili Hou,Ying Zhang,Jihua Shang,Haibo Ren,Yufeng Sun
Due to the prevailing energy shortages, the pursuit of new alternative energy sources is becoming increasingly urgent. Hydrogen production through water electrolysis has emerged as a crucial method. However, the sluggish four-electron reaction in the oxygen evolution reaction (OER) remains the primary rate-limiting step. In this study, we synthesized a heterostructure La(OH) 3 @CuO-P material on the nickel foam (NF) substrate. The experimental results demonstrate that after phosphating treatment, the heterostructure La(OH) 3 @CuO-P exhibits exceptional catalytic performance with only 215 mV overpotential, a Tafel slope value of 79.36 mV/dec, and a bilayer capacitance of 39.02 mF/cm 2 at a current density of 10 mA/cm 2 for OER in a 1 M KOH solution. These values are significantly superior compared to those obtained using heterostructure La(OH) 3 @CuO alone which showed an overpotential value of 365 mV at a current density of 10 mA/cm 2 . Moreover, during cyclic voltammetry testing for up to 500 cycles, La(OH) 3 @CuO-P also demonstrates relatively stable performance. Analyses suggest that composite heterostructure effectively addresses issues such as insufficient conductivity of La(OH) 3 and monomer aggregation tendency for CuO while maintaining excellent properties for each component. By incorporating P atoms as dopants, the interaction between La, Cu, and P atoms not only facilitates fine-tuning of the electronic structure and optimization of the adsorption free energy (-OH), but also promotes an increase in catalytic active sites through sample size reduction, thereby further augmenting the performance of the OER.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Huajun Zhou,Yuzhen Zhang,Chenxi Shi,Kai Yuan,Rui Zhou,Peihua Zhao,Yongping Qu,Yanzhong Wang
Efficient and inexpensive oxygen evolution reaction (OER) catalysts are essential for the electrochemical splitting of water into hydrogen fuel. Herein, we have successfully synthesized NiCoFe(OH) x nanosheets on Ni-Fe foam (NFF) by exploiting the Fenton-like effect of Co 2+ and S 2 O 8 2− to corrode the NFF foam. The as-prepared NiCoFe(OH) x /NFF exhibits the porous structure with the interconnected nanosheets that are firmly bonded to the conductive substrate of NFF, thereby enhancing ions and charge transfer kinetics. The unique structure and composition of NiCoFe(OH) x /NFF result in the low overpotentials of 200 and 262 mV at current densities of 10 and 100 mA cm −2 , respectively, as well as a low Tafel slope of 53.25 mV dec −1 . In addition, NiCoFe(OH) x /NFF displays low overpotentials of 267 and 294 mV at a high current density of 100 mA cm −2 in simulated and real seawater, respectively. Furthermore, the assembled NiCoFe(OH) x //Pt/C water electrolysis cell has achieved a current density of 10 mA cm −2 at a low voltage of 1.49 V, and displayed the good stability with slight attenuation for 110 h. The high OER performance of NiCoFe(OH) x is attributed to the co-catalytic effect of the three metal ions and the interconnected porous nanosheet structure.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Kunfeng Zhang,Jinxia Liang,Sainan Yang,Fangfei Song,Hongxia Chen,Baozhong Zhang,Bo Peng,Hanyu Chen,Hongxing Dai
Constructing an S-scheme heterojunction presents an effective strategy to enhance photocatalytic efficiency via accelerating photoexcited charge separation while preserving strong redox potentials. Herein, amorphous Ni(OH) 2 (a-NH) was in-situ integrated with crystalline Bi 12 O 17 Br 2 (BOB) nanosheets to form an amorphous/crystalline a-NH/BOB S-scheme heterojunction. The as-synthesized a-NH/BOB-0.5 photocatalyst exhibited superior bisphenol A (BPA) degradation efficiency, achieving 48.7 and 3.7-fold enhancements compared to individual a-NH and BOB, respectively. Comprehensive investigations revealed that the improved photocatalytic activity originated from the synergistic effects of enhanced light-harvesting ability and the formation of strong interfacial electric field at the amorphous/crystalline interface. Moreover, the influences of solution pH, coexisting anions, and water matrices on BPA degradation efficiency were also investigated. Reaction mechanism and toxicity assessment demonstrated that BPA could be gradually transformed into small molecules with low toxicity. This work demonstrates an efficient approach for the design of high-performance photocatalysts for environmental remediation by constructing amorphous/crystalline interface and S-scheme charge transfer mechanism.
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