The pressing environmental concerns and the depletion of fossil fuel reserves necessitate a transition toward sustainable energy sources.Ethanol,a renewable biomass-derived fuel,is a promising alternative due to its a...The pressing environmental concerns and the depletion of fossil fuel reserves necessitate a transition toward sustainable energy sources.Ethanol,a renewable biomass-derived fuel,is a promising alternative due to its availability and high energy density.This study investigates the synthesis of gold nanoparticles(Au NPs)via a square-wave pulse deposition technique,aiming to enhance catalytic activity for ethanol electrooxidation.By varying pulse durations,we were able to exert precise control over Au NP size and distribution without stabilizing agents.Characterization using field emission scanning electron microscopy and X-ray diffraction techniques confirmed the formation of clustered nanoparticles of metallic gold phase.Electrochemical characteristics analyses revealed that Au NPs synthesized with a 900 ms pulse duration exhibited the lowest charge transfer resistance and the highest electrochemically active surface area.The electrocatalytic performance test of these Au NPs demonstrated an anodic current density of 2.5 mA cm^-(2)and a Tafel slope of 78 mV dec^(-1),indicating superior catalytic performance and reaction kinetics.Additionally,the Au NPs showed high resistance to poisoning,as evidenced by a low j_(b)/j_(f)ratio of 0.28 and stable chronoamperometric response.These findings underscore the potential of this synthesis method for producing high-performance electrocatalysts utilized in exploiting ethanol's potential as an environmentally friendly energy carrier.展开更多
Cu_(2)O is a promising material for the hydrogen evolution reaction due to the favourable band gap.However,achieving a pure Cu_(2)O phase typically requires high deposition temperatures.To overcome this,electrolyte pH...Cu_(2)O is a promising material for the hydrogen evolution reaction due to the favourable band gap.However,achieving a pure Cu_(2)O phase typically requires high deposition temperatures.To overcome this,electrolyte pH modification was employed to synthesize pure Cu_(2)O at room temperature.A key challenge in room-temperature electrodeposition is the slow deposition rate,which can be improved through photoelectrodeposition.This study explores the synthesis of pure Cu_(2)O via controlled pH photoelectrodeposition for applications of the hydrogen evolution reaction.The results demonstrate that Cu_(2)O films were successfully deposited in an alkaline electrolyte,with the best hydrogen evolution reaction catalytic performance observed at pH 8.This sample exhibited a low onset potential of 64 mV with respect to the standard reversible hydrogen electrode and a Tafel slope of 46 mV/dec.These findings provide the optimization of Cu_(2)O synthesis for hydrogen production.展开更多
基金supported by the National Research and Innovation Agency(BRIN)and Lembaga Pengelola Dana Pendidikan(LPDP)Ministry of Finance,Republic of Indonesia through Riset dan Inovasi Untuk Indonesia Maju(RIIM)scheme batch 2 with contract number 1/PG.02.00.PT/LPPM/IV/2024(110/IV/KS/11/2022).
文摘The pressing environmental concerns and the depletion of fossil fuel reserves necessitate a transition toward sustainable energy sources.Ethanol,a renewable biomass-derived fuel,is a promising alternative due to its availability and high energy density.This study investigates the synthesis of gold nanoparticles(Au NPs)via a square-wave pulse deposition technique,aiming to enhance catalytic activity for ethanol electrooxidation.By varying pulse durations,we were able to exert precise control over Au NP size and distribution without stabilizing agents.Characterization using field emission scanning electron microscopy and X-ray diffraction techniques confirmed the formation of clustered nanoparticles of metallic gold phase.Electrochemical characteristics analyses revealed that Au NPs synthesized with a 900 ms pulse duration exhibited the lowest charge transfer resistance and the highest electrochemically active surface area.The electrocatalytic performance test of these Au NPs demonstrated an anodic current density of 2.5 mA cm^-(2)and a Tafel slope of 78 mV dec^(-1),indicating superior catalytic performance and reaction kinetics.Additionally,the Au NPs showed high resistance to poisoning,as evidenced by a low j_(b)/j_(f)ratio of 0.28 and stable chronoamperometric response.These findings underscore the potential of this synthesis method for producing high-performance electrocatalysts utilized in exploiting ethanol's potential as an environmentally friendly energy carrier.
基金supported by the Direktorat Penelitian dan Pengabdian Kepada Masyarakat(DPPM),Kementrian Pendidikan Tinggi,Sains,dan Teknologi of the Republic of Indonesia(Grant No.3/UN39.14/C3/DT.05.00/PT-LP/PL/2025).
文摘Cu_(2)O is a promising material for the hydrogen evolution reaction due to the favourable band gap.However,achieving a pure Cu_(2)O phase typically requires high deposition temperatures.To overcome this,electrolyte pH modification was employed to synthesize pure Cu_(2)O at room temperature.A key challenge in room-temperature electrodeposition is the slow deposition rate,which can be improved through photoelectrodeposition.This study explores the synthesis of pure Cu_(2)O via controlled pH photoelectrodeposition for applications of the hydrogen evolution reaction.The results demonstrate that Cu_(2)O films were successfully deposited in an alkaline electrolyte,with the best hydrogen evolution reaction catalytic performance observed at pH 8.This sample exhibited a low onset potential of 64 mV with respect to the standard reversible hydrogen electrode and a Tafel slope of 46 mV/dec.These findings provide the optimization of Cu_(2)O synthesis for hydrogen production.
