Gökdoğan Şahin, Özlem

Profile URL
https://hdl.handle.net/20.500.13091/11671
Name Variants
Gokdogan Sahin, O. Gökdoğan Şahin, Ö. Şahin, Özlem Gökdoğan Şahin, Özlem Gokdogan Sahin, Ozlem
Job Title
Email Address
osahin@ktun.edu.tr
Main Affiliation
02.01. Department of Chemical Engineering
Status
Current Staff
Website
ORCID ID
0000-0001-6188-5517
Scopus Author ID
24766836200
Turkish CoHE Profile ID
3881AEAFD0E09131
Google Scholar ID
IHxj1oQAAAAJ
WoS Researcher ID
V-4419-2017

Research Topics

Domains
Physical Sciences
Fields
EnergyChemistryEngineeringMaterials Science
Subfields
Renewable Energy, Sustainability and the EnvironmentElectrochemistryElectrical and Electronic EngineeringPolymers and Plastics
Specific Research Areas
Electrocatalysts for Energy Conversion
Electrochemical Analysis and Applications
Fuel Cells and Related Materials
Electrochemical sensors and biosensors
Conducting polymers and applications

Sustainable Development Goals

NO POVERTY1
NO POVERTY
0
Research Products
ZERO HUNGER2
ZERO HUNGER
0
Research Products
GOOD HEALTH AND WELL-BEING3
GOOD HEALTH AND WELL-BEING
2
Research Products
QUALITY EDUCATION4
QUALITY EDUCATION
0
Research Products
GENDER EQUALITY5
GENDER EQUALITY
0
Research Products
CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
2
Research Products
AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
9
Research Products
DECENT WORK AND ECONOMIC GROWTH8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
0
Research Products
REDUCED INEQUALITIES10
REDUCED INEQUALITIES
0
Research Products
SUSTAINABLE CITIES AND COMMUNITIES11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
RESPONSIBLE CONSUMPTION AND PRODUCTION12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
CLIMATE ACTION13
CLIMATE ACTION
0
Research Products
LIFE BELOW WATER14
LIFE BELOW WATER
3
Research Products
LIFE ON LAND15
LIFE ON LAND
0
Research Products
PEACE, JUSTICE AND STRONG INSTITUTIONS16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
PARTNERSHIPS FOR THE GOALS17
PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents

23

Citations

342

h-index

10

Go to Scopus profile
Documents

0

Citations

0

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Publication Collaboration

Affiliation Name Count
Van Yüzüncü Yıl Üniversitesi 13
Konya Technical University 12
Selçuk University 10
Tarımsal Araştırmalar ve Politikalar Genel Müdürlüğü 4
Maden Tetkik ve Arama Genel Müdürlüğü 4
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Data obtained from OpenAlex
Scholarly Output

23

Articles

11

Views / Downloads

42/245

Supervised MSc Theses

4

Supervised PhD Theses

0

WoS Citation Count

196

Scopus Citation Count

180

Patents

0

Projects

0

WoS Citations per Publication

8.52

Scopus Citations per Publication

7.83

Open Access Source

16

Supervised Theses

4

JournalCount
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY2
ELECTROANALYSIS1
ENERGY STORAGE1
International Journal of Chemistry and Technology (IJCT)1
INTERNATIONAL JOURNAL OF ENERGY RESEARCH1
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Author of Publication: search.filters.isAuthorOfPublication.41e9e0e2-717a-4620-8366-41c2b122174f

Scholarly Output Search Results

Now showing 1 - 10 of 23
  • Master Thesis
    Voltametrik Yöntemle Ağır Metal Tayini
    (Konya Teknik Üniversitesi, 2021) Nadeesh, Abdullah; Şahin, Özlem Gökdoğan
    Hızlı sanayileşme ve kentleşme, çevrenin ağır metaller tarafından kirlenmesine neden olmuş ve bunların çevreye yayılma ve taşınma oranları büyük ölçüde hızlanmıştır. Ağır metallerin çevreye olumsuz etkileri giderek artmakta ve dünya çapında neden olduğu etkiler nedeniyle büyük bir sorun haline gelmektedir. Bu nedenle ağır metallerin doğru ve duyarlı tayini için basit ve hızlı yöntemler geliştirmek önemlidir. Bu yüksek lisans tez çalışmasında sentezlenen CuFe2O4-rGO kompoziti kullanılarak elektrokimyasal yöntemlerden biri olan voltametrik yöntemle ağır metal tayini amaçlanmıştır. CuFe2O4-rGO/GCE ile diferansiyel puls anodik sıyırma voltametrisi (DPASV) tekniği kullanılarak Zn+2 ve Cd+2 ağır metal iyonlarının tayini gerçekleştirilmiştir. Bu amaçla, elektrolit türü, elektrolit derişimi, elektrolit pH'ı, biriktirme potansiyeli ve biriktirme süresi gibi deneysel parametreler incelenerek, cevap akımını etkileyen parametrelerin optimum koşulları belirlenmiştir.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 8
    Fabrication of Novel Palladium-Platinum Based Graphene/Ito Electrodes and Third Metal Addition Effect Through the Glucose Electrooxidation
    (Elsevier Science Sa, 2022-08-01) Çağlar, Aykut; Hansu, Tülin Avcı; Şahin, Özlem; Kıvrak, Hilal; Avci Hansu, Tulin
    Graphene was coated on Cu foil by chemical vapor deposition (CVD) method. The graphene on the Cu foil was modified by doping N. Then, N-doped graphene (G) was coated on several layers of indium tin oxide (ITO) electrodes. In addition, Pd, Pt, and M (Ag, V, Ni, Zn) metals were electroprecipitated on the graphene/indium tin oxide electrode by electrochemical technique. In this way, the glucose (C6H12O6) electrooxidation activities of these electrodes obtained from PdMPt-N doped graphane/indium tin oxide were investigated by cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) measurements. The obtained materials were characterized by SEM-EDX. Results revealed that the network of Pd, Pt, Ag, V, Ni, Zn and graphene was clearly visible from the SEM results. As a consequence, PdZnPt-N doped G/ITO showed the most effective C6H12O6 electrooxidation activity with a specific activity of 14.5 mA cm(-2), considerably above the literature's published values. In all electrochemical measurements, PdZnPt-N doped G/ITO exhibited the best electrocatalytic activity, stability, and resistance. PdZnPt-N doped G/ITO electrode is promising electrode for glucose electrooxidation.
  • Article
    Citation - WoS: 12
    Citation - Scopus: 11
    Dendrimer Templated Synthesis of Carbon Nanotube Supported Pdau Catalyst and Its Application as Hydrogen Peroxide Sensor
    (WILEY-V C H VERLAG GMBH, 2019-05-22) Alal, Orhan; Çağlar, Aykut; Kıvrak, Hilal; Şahin, Özlem
    At present, CNT supported catalysts were prepared by two different methods as NaBH4 reduction and dendrimer templated NaBH4 reduction method to observe the effect of preparation method on the sensitivity and activity of H2O2 reduction. Then, CNT supported PdxAuy bimetallic nanocatalysts having various atomic ratio were synthesized via novel dendrimer templated NaBH4 reduction method. The resulting materials were characterized employing XRD and TEM. Crystallite size of 10 %Pd0.7Au0.3/CNTdendrimer was obtained from XRD 17.1 nm and mean particle size obtained from TEM is about 15 nm. Moreover, the electrochemical behavior of these catalysts was characterized by cyclic voltammetry (CV) and chronoamperometry (CA) techniques. PdxAuy bimetallic nanocatalysts have excellent electrocatalytic properties and great potential for applications in electrochemical detection. The sensitivity and the limit of detection values for the prepared sensor with monometallic 10 % Pd/CNTdendrimer catalysts are 219.78 mu A mM(-1)cm(-2) and 2.6 mu M, respectively. However, the sensor constructed with 10 %Pd0.7Au0.3/CNTdendrimer modified electrode has a very high sensitivity of 316.89 mu A mM(-1) cm(-2) with a quick response time of 2 s and a wide linear range of 0.001-19.0 mM. In addition, the interference experiment indicated that the 10 % Pd0.7Au0.3/CNTdendrimer nanoparticles have good selectivity toward H2O2.
  • Conference Object
    Synthesis of B Doped and In-Situ B Doped Few Layer Graphene by Chemical Vapor Deposition Technique for Hydrogen Peroxide Detection
    (2019) Çağlar, Aykut; Ulus, Berdan; Nadeesh, Abdullah; Kıvrak, Hilal; Gökdoğan Şahin, Özlem
    In this study, boron (B)-doped graphene and insitu B-doped few-layer graphene are deposited on copper (Cu) foil by chemical vapor deposition (CVD) method. Then, B-doped graphene and insitu B-doped few-layer graphene on the Cu foils were coated onto few-layer the indium tin oxide (ITO) electrode for hydrogen peroxide (H2O2) sensor. These electrodes are characterized by Scanning Electron Microscopy-Energy Dispersive X-Ray Analysis (SEM-EDX) and Raman Spectroscopy. In addition, H2O2 sensor is investigated with cyclic voltammetry (CV) and chronoamperometry (CA).
  • Master Thesis
    Elektrokimyasal Yöntemlerle Bakır (ıı) ve Cıva (ıı) Tayini
    (Konya Teknik Üniversitesi, 2021) Özütemiz, Rabia Esra; Gökdoğan Şahin, Özlem
    Son yıllarda endüstrinin ve teknolojinin gelişmesiyle birlikte yüksek saflıktaki maddelere olan ihtiyacın artması, hava, su, toprak kirliliğinin canlılar üzerindeki etkisi gibi çevre sorunlarının giderek önem kazanması ve eser elementlerin sağlık üzerindeki etkilerinin bilinmesi, bu elementlerin analizlerini analitik kimyanın en önemli araştırma konularından biri haline getirmiştir. Bu nedenle, çevreye yayılan eser elementlerin canlılara ve çevreye yaptıkları olumsuz etkiler sebebiyle bu elementlerin analizi için çeşitli yöntemler geliştirilmektedir. Bu yöntemlerden biri olan diferansiyel puls anodik sıyırma voltametrisi yöntemi ise duyarlılığı ve seçiciliği sebebiyle tercih edilen elektrokimyasal bir yöntemdir. Yapılan tez çalışmasında, camsı karbon elektrot (GCE), NiFe2O4-rGO kompoziti ile modifiye edilerek elektrokimyasal olarak ağır metal tayininde ilk kez bu tez kapsamında kullanılmıştır. NiFe2O4- rGO/GCE ile diferansiyel puls anodik sıyırma voltametrisi (DPASV) tekniği kullanılarak Cu (II) ve Hg (II) ağır metallerinin tayini gerçekleştirilmiştir. Bu amaçla, biriktirme potansiyeli, biriktirme süresi, elektrolit türü, elektrolit derişimi, elektrolit pH'ı ve substrat derişimi gibi deneysel parametreler incelenerek, pik akımını etkileyen parametrelerin optimum koşulları belirlenmiştir.
  • Master Thesis
    Hidrojen Peroksit Yakıt Hücreleri için Elektrokatalizör Sentezi ve Karakterizasyonu
    (Konya Teknik Üniversitesi, 2019) Yapıcı, Burak; Şahin, Özlem Gökdoğan
    Bu çalışmada; hidrojen peroksit (H2O2) yakıt hücrelerinde kullanılmak üzere karbon nanotüp (CNT) destekli çekirdek-kabuk ve bimetalik alaşım katalizörler sentezlenmiştir. M-Pd (M: Ni, Ag, Co, Mn, V, Zn) çekirdek-kabuk katalizörler dendrimer şablon metodu ile sentezlenmiştir. Bimetalik alaşım katalizörler ise NaBH4 indirgeme yöntemi ile hazırlanmıştır. Katalizörlerin H2O2 elektroindirgenme reaksiyonu için aktiviteleri dönüşümlü voltametri, kronoamperometri ve elektrokimyasal impedans spektroskopisi yöntemleri ile incelenmiştir. Çekirdek-kabuk yapıdaki ZnPd/CNT katalizörü H2O2 elektroindirgenme reaksiyonu için daha yüksek aktivite göstermiştir.
  • Article
    Citation - WoS: 24
    Citation - Scopus: 26
    A Novel Experimental and Density Functional Theory Study on Palladium and Nitrogen Doped Few Layer Graphene Surface Towards Glucose Adsorption and Electrooxidation
    (PERGAMON-ELSEVIER SCIENCE LTD, 2021-03-01) Çağlar, Aykut; Düzenli, Derya; Önal, Işık; Tezsevin, İlker; Şahin, Özlem; Kıvrak, Hilal
    At present, few layer graphene (G) and nitrogen doped few layer graphene (N doped-G) are firstly coated on Cu foil via chemical vapor deposition (CVD) method and G and N doped-G coated Cu foil is transferred to the indium tin oxide (ITO) substrate surface to obtain electrodes. Pd metal is electrodeposited onto the N doped-G/ITO electrode (Pd-N doped-G/ITO). Pd-N doped-G/ITO electrode are characterized with advanced surface characterization methods such as Raman spectroscopy and SEM-EDX. Characterization results reveal that G and N structures are succesfully obtained and the presence of Pd on Pd-N doped-G/ITO is confirmed with SEM-EDX mapping. The cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) are employed to examine glucose electrooxidation of G/ITO, N-doped G/ITO, and Pd-N-doped G/ITO electrodes. P-N-dopedG/ITO electrode exhibits the best glucose electrooxidation activity with 2 mA/cm(2) specific activity. Density functional theory (DFT) calculations are also carried out to better understand the interaction of the molecules on Pd modified G (Pd-G) and Pd modified N-doped G (Pd-3NG) surfaces.
  • Conference Object
    Synthesis of In-Sıtu S Doped Few Layer Graphene by Chemical Vapor Deposition Technique and Their Superior Glucose Electrooxidation Activity
    (2019) Çağlar, Aykut; Ulaş, Berdan; Muhammady, Shekiba; Kıvrak, Hilal; Gökdoğan Şahin, Özlem
    In this study, sulfur (S)-doped graphene and insitu S-doped graphene are deposited on copper (Cu) foil by chemical vapor deposition (CVD) method. Then, S-doped graphene and insitu S doped few-layer graphene on the Cu foils were coated onto few-layer the indium tin oxide (ITO) electrode for glucose electrooxidation. These electrodes are characterized by Scanning Electron Microscopy-Energy Dispersive X-Ray Analysis (SEM-EDX) and Raman Spectroscopy. In addition, glucose electrooxidation was investigated with cyclic voltammetry (CV) and chronoamperometry (CA).
  • Conference Object
    Trace Element Determination by Electrochemical Methods
    (2019) Takir, Rabia Esra; Atacan, Keziban; Gökdoğan Şahin, Özlem
    Today, heavy metals emitted to the environment have been the subject of research to cause both environmental problems and health problems. Therefore, a simple, fast and effective method for the determination of trace amounts of heavy metals has been developed. Among the techniques developed, electrochemical methods (cyclic voltammetry, differential pulse voltammetry, chronoamperometry, electrochemical impedance spectroscopy, etc.) are the most powerful and sensitive method for heavy metal detection (Khadro et.al.2011; Wassana et.al.2007). Moreover, these methods are cheap, sensitive, rapid and portable (Pujol et.al.2014). The advantage of anodic stripping technique is the pre-concentration step, which enables such low concentration analysis. Therefore, different nanomaterials with high adsorption capability and catalytic activity are usually used for electrochemical detection of heavy metals. Ferrite nanoparticles has attracted great attention for high adsorption capacity and magnetism. In this study, NiFe2O4 based modified glassy carbon electrode was developed to detect copper (Cu2+) and mercury (Hg2+) by differential pulse voltammetry.
  • Article
    Citation - WoS: 38
    Citation - Scopus: 41
    Synthesis of in Situ N-, S-, and B-Doped Few-Layer Graphene by Chemical Vapor Deposition Technique and Their Superior Glucose Electrooxidation Activity
    (WILEY, 2019-08-20) Çağlar, Aykut; Ulaş, Berdan; Şahin, Özlem; Kıvrak, Hilal
    At present, N-, S-, and B-doped grapheme-modified indium tin oxide (ITO) electrodes are produced and doping method effect on the glucose electrooxidation is investigated. Firstly, few-layer graphene is produced by chemical vapor deposition (CVD) method. Then, N, S, and B doping is carried out after graphene produced by CVD to prepare N-doped, B-doped, and S-doped few-layer graphene. N, S, and B doping is carried out by two different ways as (a) doping after synthesis of few-layer graphene and (b) in situ doping during few-layer graphene production. These materials are characterized by X-ray diffraction, scanning electron microscopy-energy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). One could note that graphene and nitrogen networks are clearly visible from SEM images. Raman spectra show that B, N, and S are doped on few-layer graphene/ITO successfully. XPS results of graphene, N-doped graphene, and in situ N-doped graphene reveal that graphene and nitrogen atoms used in the preparation of the electrodes obtain mainly in their elemental state. Then, these N-, S-, B-doped and in situ N-, S-, B-doped few-layer graphene materials are coated onto indium tin oxide (ITO) to obtain N-, S-, B-doped and in situ N-, S-, B-doped ITO electrodes for glucose (C6H12O6) electrooxidation. C6H12O6 electrooxidation measurements are investigated with cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy measurements. As a result, in situ N-doped few-layer graphene/ITO electrode displays the best C6H12O6 electrooxidation activity with 9.12 mA.cm(-2) current density compared with other N-, S-, B-doped graphene and in situ doped S and B grapheme-modified ITO electrodes. Furthermore, this current density value for in situ N-doped few-layer graphene/ITO is highly above the values reported in the literature. In situ N-doped few-layer graphene/ITO electrode is a promising electrode for C6H12O6 electrooxidation because it exhibits the best electrocatalytic activity, stability, and resistance compared with other electrodes.