Researcher:
Hatipoğlu, Ezgi

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Ezgi

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Hatipoğlu

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Hatipoğlu, Ezgi

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    Publication
    Design of metal-substituted tungsten diboride as an efficient bifunctional electrocatalyst for hydrogen and oxygen evolution
    (Wiley, 2022) N/A; N/A; N/A; N/A; Department of Chemistry; Department of Chemistry; Hatipoğlu, Ezgi; Peighambardoust, Naeimeh Sadat; Sadeghi, Ebrahim; Aydemir, Umut; Master Student; Researcher; PhD Student; Faculty Member; Koç University Boron and Advanced Materials Application and Research Center (KUBAM) / Koç Üniversitesi Bor ve İleri Malzemeler Uygulama ve Araştırma Merkezi (KUBAM); Graduate School of Sciences and Engineering; N/A; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A; 58403
    Transition metal diborides (TMDbs) have recently attracted the scientific community's attention because of their remarkable attributes as bifunctional catalysts for both oxygen and hydrogen evolution reactions (OER/HER). Herein, we present the electrocatalytic OER/HER of Co- and Ni-incorporated WB2 (W(1-x)TMxB2: TM = Ni and Co; x = 0, 0.1, 0.2, and 0.3) under alkaline media. Metal-substituted WB2 was constructed with two different synthetic approaches, molten salt (ms) and carbothermal (ct) reduction, to explore the influence of morphology on electrochemical properties to drive OER/HER in 1 M KOH. In general, materials synthesized by the ms technique are relatively better catalysts toward OER/HER. Among the samples, W0.8Co0.2B2/ms demanded the lowest respective overpotential of 340 and 363 mV to generate the current density of 10 mA cm(-2) for OER/HER and exhibited favorable stability at 10 mA cm(-2) for 12 h which were ascribed to high double-layer capacitance (0.247 mF cm(-2)) and low charge-transfer resistance.
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    Publication
    Structure-induced catalytic activity of nickel- and cobalt- substituted layered mob2 toward hydrogen evolution br
    (Amer Chemical Soc, 2022) N/A; N/A; N/A; Department of Chemistry; Department of Chemistry; Peighambardoust, Naeimeh Sadat; Hatipoğlu, Ezgi; Aydemir, Umut; Researcher; Researcher; Faculty Member; Koç University Boron and Advanced Materials Application and Research Center (KUBAM) / Koç Üniversitesi Bor ve İleri Malzemeler Uygulama ve Araştırma Merkezi (KUBAM); Koç University Boron and Advanced Materials Application and Research Center (KUBAM) / Koç Üniversitesi Bor ve İleri Malzemeler Uygulama ve Araştırma Merkezi (KUBAM); N/A; N/A; College of Sciences; N/A; N/A; 58403
    Production of high-quality green hydrogen gas as a potential alternative to fossil fuels has been of vital importance in recent years. Among many functional materials, layered metal diborides (MDbs) have attracted great attention from the scientific community due to their outstanding catalytic activity toward hydrogen evolution. This study is dedicated to examine the water electrolysis of a series of metal-substituted MoB2 electrocatalysts (Mo(1-x)TMxB2; TM = Ni and Co; x = 0, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5) synthesized by a facile molten salt technique. The electrocatalysis of materials was assessed in 1.0 M KOH by measuring the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting. Interestingly, as the substitution content of TM increases, alpha-MoB2, with graphenelike boron layers, transforms into beta-MoB2 comprising both flat and puckered boron layers, where alpha-MoB2 has demonstrated enhanced electrocatalytic performance. Mo0.9Ni0.1B2 afforded 10 mA cm-2 at a low overpotential of 222 mV toward HER (located very close to the commercial Pt/C). The assembled Mo0.9Ni0.1B2 (cathode)parallel to Mo0.8Co0.2B2 (anode) couple demanded 1.75 V to produce 10 mA cm-2, which is near the potential of state-of-the-art Pt/C parallel to RuO2 pair. The Faradaic efficiency of generated H2 was determined to be approximately 80%.