Article
Chemistry, Physical
Kuo-Hui Wu, Jian Cao, Tigmansu Pal, Huaipu Yang, Hiroshi Nishihara
Summary: Bis(diimino)metal (MDI) nanosheets (M = Ni, Co, Cu) are synthesized quickly on ITO, GC, and CP by electro-oxidation, showing high crystallinity and electrocatalytic activity. Among coordination nanosheet (CONASH) catalysts, NiDI exhibits the lowest overpotential for hydrogen evolution reaction.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Rahmad Syah, Awais Ahmad, Afshin Davarpanah, Marischa Elveny, Dadan Ramdan, Munirah D. Albaqami, Mohamed Ouladsmane
Summary: In this study, a novel nanocomposite material containing partially reduced Bi2O3 into metallic Bi anchored on a 3D network of Ni-foam was prepared as a high-performance catalyst for electrochemical hydrogen reduction. The hybrid material exhibited high catalytic activity due to the cooperative effect of Bi/Bi2O3 and Ni-foam, providing effective surface area and porous structure. The advantages of the electrode, including high current density, low overpotential, and stability, were highlighted through comparisons with related works.
Article
Chemistry, Multidisciplinary
Fan Zhang, Shenggui Liu, Fei Wang
Summary: Microscopic nucleation and growth in the early stages of jet electrodeposition of nickel coatings are crucial for the consistency and reliability of the coating structure. This study established a three-electrode device with flow-injection function and investigated the early stages of nanocluster formation under different distribution states. By analyzing nucleation diffusion and growth, a coarse-grained molecular dynamics model was proposed to reveal the influences of different growth environments on microscopic nucleation growth. Additionally, surface coating's physical structure was obtained through element analysis and density functional theory calculations.
Article
Chemistry, Multidisciplinary
Maryam Khalaji-Verjani, Majid Masteri-Farahani, Maryam Mohammadikish, Mohammad Hossein Mashhadizadeh
Summary: A stable nanocomposite consisting of thiol-functionalized lacunary Keggin-type phosphomolybdate (PMo11) and graphene oxide (GO) was successfully prepared by the thiol-ene click reaction. Characterization techniques confirmed the strong covalent interaction and successful formation of the PMo11-S-GO nanocomposite. The nanocomposite exhibited excellent electrocatalytic activity for the hydrogen evolution reaction with low overpotential and small Tafel slope, and also demonstrated high stability for at least 850 cycles due to the stable covalent attachment of PMo11 to GO nanosheets.
Article
Chemistry, Analytical
Duygu Akyuz, Ahmet Senocak, Baybars Koksoy, Ipek omeroglu, Mahmut Durmus, Erhan Demirbas
Summary: A novel asymmetrical zinc(II) phthalocyanine was synthesized and covalently attached to single walled carbon nanotube through azide-alkyne Huisgen cycloaddition reaction to prepare a functionalized nanomaterial for hydrogen and oxygen evolution reactions in water splitting. The hybrid material showed improved performance in both HER and OER compared to SWCNT catalyst alone. The presence of Coum-Pc groups on the SWCNT surface increased the conductivity and electron transfer rate of the composite, leading to enhanced activity in water splitting reactions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Review
Energy & Fuels
Mohamad Sahban Alnarabiji, Shik Chi Edman Tsang, Abdul Hanif Mahadi
Summary: This paper reviews the fabrication methods of working electrodes for electrochemical water splitting, including both chemical and physical methods. The research direction in this field is demonstrated by analyzing articles in the database. The advantages and disadvantages of the reported fabrication methods are critically assessed.
Article
Chemistry, Multidisciplinary
Zhi Chen, Ying Zhao, Yuxiao Gao, Zexing Wu, Lei Wang
Summary: This study demonstrates a novel and facile strategy for designing highly efficient and stable nanomaterials for hydrogen production by preparing MoP-RuP2@NPC electrocatalyst with porous nanostructure and abundant active sites. Compared to other materials, MoP-RuP2@NPC shows superior electrocatalytic performance for hydrogen evolution reactions. Furthermore, intermittent solar energy, wind energy, and thermal energy were successfully utilized to drive the electrolyzer for hydrogen gas generation.
Article
Green & Sustainable Science & Technology
S. Wan, Y. Li, L. Xu, W. Zhang, R. Cao
Summary: Different manganese oxides have been widely studied as catalysts for water oxidation, but the optimal structure for electrocatalytic water oxidation is still debated. By synthesizing autologous Mn oxides with similar physical properties and different phase structures, it was observed that Mn2O3 exhibited the best catalytic performance, which was attributed to the easy generation of Mn-III.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Engineering, Environmental
Yue Wang, Pengfei Yang, Yuecheng Gong, Dongzheng Liu, Silu Liu, Weiping Xiao, Zhenyu Xiao, Zhenjiang Li, Zexing Wu, Lei Wang
Summary: The development of highly efficient and low-cost electrocatalysts for hydrogen/oxygen evolution reactions is crucial for their large-scale practical applications. The use of corrosive engineering and low-temperature phosphorization approach enables the preparation of Mo-doped NiFeP on nickel-iron foam with amorphous morphology, porous structure, and superhydrophilic surface, providing abundant active sites and facilitating charge transfer. The prepared Mo-NiFeP/NIF exhibits excellent electrocatalytic performance for OER and HER with low overpotentials and remarkable stability under large current density.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Kailu Guo, Yantao Wang, Junfeng Huang, Hua Li, Yong Peng, Cailing Xu
Summary: Creating dual-site catalysts that can provide good OH and H interaction sites for water dissociation and hydrogen adsorption is an effective strategy for improving hydrogen generation activity in alkaline medium. However, constructing a robust dual-site catalyst with multiple and efficient interfaces remains a significant challenge. In this study, a symbiotic Ni3Se4/Ni heterostructure is successfully synthesized using the thermodynamically unstable cubic NiSe2 phase as a sacrificial template. The Ni3Se4/Ni heterostructure exhibits optimized d-band center and electronic state of Ni sites, which is favorable for hydrogen adsorption. The Ni3Se4/Ni catalyst shows low overpotential for hydrogen generation in 1 M KOH, thanks to its good electrical conductivity, large electrochemical surface area, and distinct sites for water dissociation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yanxia Ma, Yuyan Liu, Yujin Ji, Youyong Li
Summary: In this study, the structural stabilities, electronic properties, and hydrogen evolution performances of nine kinds of 2D M4/3B2 materials were investigated using density functional theory calculations. The results showed that most of the materials were stable and promising for hydrogen production, except for Cr4/3B2. Monolayers of metallic Ti4/3B2 and Ta4/3B2 were susceptible to oxidation in aqueous environments, but had optimal hydrogen adsorption free energies and exchange current densities.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Physical
Yuxiao Gao, Ying Zhao, Hongru Liu, Mingyu Shao, Zhi Chen, Tianyi Ma, Zexing Wu, Lei Wang
Summary: In this study, a Ru-Re3P4/NPC catalyst with porous nanostructure was prepared using a low-toxic material, which successfully regulated the electrocatalytic activity and improved the efficiency of the hydrogen evolution reaction.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Jiaqian Guo, Chun Ouyang, Zhenxiang Zhan, Ting Lei, Pin Yin
Summary: The tubular CoP exhibits superior performance in both HER and OER, attributed to its porous tube-like structure providing rich exposed active sites and accelerating the charge or mass transfer efficiency, leading to efficient promotion of the HER performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Xi-Zheng Fan, Qing-Qing Pang, Fan Fan, Hong-Chang Yao, Zhong-Jun Li
Summary: In this study, a facile strategy for fabricating efficient and stable pH-universal catalysts for the hydrogen evolution reaction (HER) is presented. The hybrid catalyst, composed of ultra-fine Ru nanoparticles (NPs) decorated V2O3 on carbon cloth (Ru/V2O3-CC), exhibits excellent HER activities in a wide pH range and superior stability in acidic, alkaline, and neutral media. The interaction between Ru NPs and V2O3 is found to optimize the adsorption energy of Ru towards hydrogen intermediate H*, favoring the HER process.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Xiaorui Yu, Lixin Chen, Liuyu Jia, Lizhi Feng, Liu Yang, Jing Li, Baodan Liu
Summary: In this study, highly efficient and stable clustered CoP nanowires electrocatalysts were synthesized on nickel foam, and an ion exchange strategy was proposed to precisely control the doping content of iron to modify the electrochemical activity of CoP nanowires. The introduction of iron effectively changes the surface atomic configuration and electronic structure of CoP, increasing the active sites and enhancing the catalytic performance. The synthetic strategy of CoFeP/NF electrode proposed in this work will significantly promote the development of highly efficient transition metal phosphides electrocatalysts with lower overpotential and better stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Electrochemistry
Duygu Akyuz, Atif Koca
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2020)
Article
Energy & Fuels
Duygu Akyuz, Ali Riza Ozkaya, Atif Koca
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2019)
Article
Chemistry, Inorganic & Nuclear
Nazli Farajzadeh, Duygu Akyuz, Atif Koca, Makbule Burkut Kocak
Article
Chemistry, Physical
Irem Tanisik, Ozlem Uguz, Duygu Akyuz, Rana Muhammad Zunain Ayaz, Cevat Sarioglu, Fatma Karaca, Ali Riza Ozkaya, Atif Koca
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Yeliz Kaya, Ayse Ercag, Atif Koca
JOURNAL OF MOLECULAR STRUCTURE
(2020)
Article
Chemistry, Physical
Duygu Akyuz, Umit Demirbas, Atif Koca, Fatih Celik, Halit Kantekin
JOURNAL OF MOLECULAR STRUCTURE
(2020)
Article
Energy & Fuels
Ozlem Uguz, Atif Koca
Summary: A novel hybrid photoelectrochemical-photocatalytic hydrogen evolution reaction reactor was developed to maximize light absorption and enhance hydrogen production rate. With the residual electrolyte, the photocurrent density of the photoelectrode significantly increased, leading to improved hydrogen production rate over time.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Ozlem Uguz, Ozlem Budak, Atif Koca
Summary: In this study, composite thin films of binary metal chalcogenides (CdxZn1-xS) and electrochemically reduced graphene oxide (RGO) were successfully fabricated via repetitive cyclic voltammetry. The incorporation of RGO enhanced the conductivity and prevented photocorrosion of the chalcogenides, leading to an increase in photocurrent density. The optimized composition of CdxZn1-xS and RGO composites showed significantly enhanced photoelectrochemical performance under solar light irradiation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Ozlem Ugus, Mehmet Gumus, Yusuf Sert, Irfan Koca, Atif Koca
Summary: Water soluble Pyrazole-Perimidine (PYR-PER) hybrids with various anchoring groups were synthesized and their corrosion inhibitive efficiencies for 304 stainless steel in 1.0 M hydrochloric acid were investigated. The hybrids effectively reduced corrosion current density, increased corrosion resistance, and functioned as mixed type inhibitors.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Analytical
Yaren Erdag Maden, Gulsah Gumrukcu Kose, Guelnur Keser Karaoglan, Atif Koca
Summary: A series of metal-free and metallo phthalocyanines (MPc) peripherally substituted with tetra-4-carboxyethylenephenoxy (M = 2H(+) (H2Pc), Co2+ (CoPc), Zn2+ (ZnPc), and TiO2+ (TiOPc)) are used as dyes in DSSCs. The feasibility of MPcs as photosensitizers is evaluated through electrochemical and in-situ spectroelectrochemical characterizations. The DSSCs using TiO2 film modified with these MPcs demonstrate improved photovoltaic performances.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Halise Yalazan, Yaren Erdag Maden, Atif Koca, Halit Kantekin
Summary: In this study, new pyrazoline-substituted CoII (CoPc), CuII (CuPc), and Mn IIICl (MnPc) phthalocyanines were synthesized and their structural characterization, electrochemical, and spectroelectrochemical properties were investigated. The redox mechanisms of these phthalocyanines were determined using in-situ spectroelectrochemical and electrochemical analyses. The enhanced redox activity of CoPc and MnPc suggests their potential applications in electrochemistry.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Electrochemistry
Ozlem Uguz Neli, Oezlem Budak, Atif Koca
Summary: Cadmium zinc sulfoselenide (CdZnSSe) and reduced graphene oxide-cadmium zinc sulfoselenide (RGO)-CdZnSSe composite-based photoelectrodes were fabricated using a facile, simultaneous co-electrodeposition method for the first time. The rCV technique allowed for homogeneous decoration of CdZnSSe particles among RGO sheets, resulting in improved photoelectrochemical performance in hydrogen evolution. The Cd0.8Zn0.2S0.2Se0.8 photodecoration demonstrated the highest photocurrent density (4.08 mA cm-2), which was further increased to 5.00 mA cm-2 by decorating with RGO. The proposed rCV technique showed superiority in fabricating well-controlled RGO-CdZnSSe composite photoelectrodes.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Gulsah Gumrukcu Kose, Gulnur Keser Karaoglan, Yaren Erdag Maden, Atif Koca
Summary: In this study, the researchers aimed to improve the performance of zinc(ii) phthalocyanine (ZnPc) used as photosensitizers in dye-sensitized solar cells (DSSCs) by changing the number of anchoring groups and their spacers on ZnPc rings. Two new asymmetric ZnPcs were synthesized and their structures were characterized by various spectroscopic methods. The researchers found that the nature of the spacer groups and the number of anchoring groups played a significant role in enhancing the efficiency of DSSCs. ZnPc(6) with three benzoic acid and naphthoic acid anchoring groups, three benzene spacers, and one naphthalene spacer exhibited higher performance compared to ZnPc(7) with three benzoic acid anchoring groups and three benzene spacers.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Burak Yildiz, Erem Ahmetali, Ozlem Budak, Atif Koca, M. Kasim Sener
Summary: Viologen-modified asymmetric zinc phthalocyanines were studied for their redox mechanisms, revealing viologen and methyl-viologen-based reduction processes in addition to the phthalocyanine-based ones. The complexes showed potential for electrochromic applications with fast, reversible color changes and transitions from cyan to purple and pink.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Ayk Beduoglu, Altug Mert Sevim, Atif Koca, Ahmet Altindal, Zehra Altuntas Bayir
NEW JOURNAL OF CHEMISTRY
(2020)