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N-Doped rGO-Like Carbon Prepared from Coconut Shell:Structure and Specific Capacitance

Journal of Renewable Materials 2023年第4期11卷 1823-1833页

作者： Imam Khambali Budhi Priyanto retno asih Malik Anjelh Baqiya Muhammad Mahyiddin Ramli Nurul Huda Osman Sarayut Tunmee Hideki Nakajima Triwikantoro Mochamad Zainuri Darminto Department of Physics Faculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberSurabaya60111Indonesia Department of Electrical Engineering Faculty of EngineeringUniversity of Muhammadiyah MalangMalang65144Indonesia Geopolymer&Green Technology Centre of Excellence Universiti Malaysia PerlisArauPerlis02600Malaysia Applied Electromagnetic Laboratory 1 Department of PhysicsFaculty of ScienceUniversiti Putra MalaysiaSelangor43400Malaysia Synchrotron Light Research Institute(SLRI) Nakhon Ratchasima3000Thailand

An rGO−like carbon compound has been synthesized from biomass,i.e.,old coconut shell,by a carbonization process followed by heating at 400°C for 5 *** nitrogen doping was achieved by adding the urea(CH4N2O)and stirring at 70°C for 14 *** morphology and structure of the rGO-like carbon were investigated by electron microscopies and Raman *** presence of C-N functional groups was analyzed by Fourier transform infrared and synchrotron X-ray photoemission spectroscopy,while the particle and the specific capacitance were measured by particle sizer and cyclic *** highest specific capacitance of 72.78 F/g is achieved by the sample with 20%urea,having the smallest particles size and the largest surface *** corresponding sample has shown to be constituted by the appropriate amount of C–N pyrrolic and pyridinic defects.

关键词： N-doped rGO−like carbon coconut shell specific capacitance

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Hydrogenated Amorphous Carbon Films from Palmyra Sugar

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Journal of Renewable Materials 2021年第6期9卷 1087-1098页

作者： Budhi Priyanto retno asih Irma Septi Ardiani Anna Zakiyatul Laila Khoirotun Nadiyyah Bima Romadhon Sarayut Tunmee Hideki Nakajima Triwikantoro Yoyok Cahyono Darminto Department of Physics Faculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberKampus ITS SukoliloSurabaya60111Indonesia Departement of Electronic Engineering Faculty of EngineeringUniversitas Muhammadiyah MalangMalangIndonesia Departement of Electronic Engineering Faculty of Industrial TechnologyInstitut Teknologi Nasional MalangMalangIndonesia Synchrotron Light Research Institute Nakhon Ratchasima3000Thailand

A simple,highly reproducible,and environmentally friendly method is a considered approach in generating renewable energy ***,hydrogenated amorphous carbon(a-C)films have been successfully prepared from palmyra liquid sugar,employing spin-coating and spraying *** with the former method,the latter shows a significance in producing a better homogeneity in particle size and film *** obtained films have a thickness of approximately 1000 to 100 nm and contain an sp^(2) hexagonal structure(~70%)and sp^(3) tetrahedral configuration(~30%)of *** introduction of boron(B)and nitrogen(N)as dopants has created the local structural modification of bonding,inducing a slight change of electrical conductivity,electronic energy bandgap,and optical transparency near-infrared *** obtained α-C film features a“green”semiconducting material.

关键词： Thin film palmyra sugar amorphous carbon boron nitrogen

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Simple and High-Yield Synthesis of a Thinner Layer of Graphenic Carbon from Coconut Shells

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Journal of Renewable Materials 2024年第5期12卷 969-979页

作者： retno asih Haniffudin Nurdiansah Mochamad Zainuri Deni S.Khaerudini Angelinus T.Setiawan A.Y.Dias Pudji Untoro Ahmad Sholihand Darminto Department of Physics Institut Teknologi Sepuluh NopemberSurabaya60111Indonesia Department of Material and Metallurgical Engineering Institut Teknologi Sepuluh NopemberSurabaya60111Indonesia Research Centre for Advanced Materials National Research and Innovation Agency(BRIN)Tangerang Selatan15314Indonesia PT.Graphene Nanomaterial Consulting Malang65141Indonesia Department of Physical Engineering Surya UniversityBanten15143Indonesia

Biomass has become of recent interest as a raw material for‘green’graphenic carbon(GC)since it promotes an environmentally friendly ***,we investigate a single pyrolysis route to synthesize GC from coconut shells which provides a simple method and can produce a high yield,thus being convenient for large-scale *** pyrolysis involves a stepped holding process at 350℃ for 1 h and at 650℃ or 900℃ for 3 *** GC sample resulted at the 900℃ pyrolysis has a thinner sheet,a less porous structure,a higher C/O ratio,and an enhanced electrical conductivity than those pyrolyzed at 650℃.The addition of Na3PO4 catalyst has no signiﬁ-cant effects on the GC structures obtained by this *** single pyrolysis route generates thinner GC sheets compared to the two-step heat treatment followed by the liquid phase exfoliation(LPE)***,the latter method offers a formation of clean samples with a porous or holey feature which has potential for advanced energy-storage applications.

关键词： Graphenic carbon biomass coconut shells pyrolysis synthesis route

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Nitrogen-Doped Amorphous Carbon Homojunction from Palmyra Sugar as a Renewable Solar Cell

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Journal of Renewable Materials 2024年第1期12卷 57-69页

作者： Budhi Priyanto Imam Khambali Irma Septi Ardiani Khoirotun Nadhiyah Anna Zakiyatul Laila M.Chasrun Hasani Bima Romadhon retno asih Yoyok Cahyono Triwikantoro Darminto Department of Electronic Engineering Faculty of EngineeringUniversitas Muhammadiyah MalangKota MalangIndonesia Advanced Materials Research Group Department of PhysicsFaculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberSurabayaIndonesia Department of Electronic Engineering Faculty of Industrials EngineeringInstitut Teknologi National MalangKota MalangIndonesia

An a-C/a-C:N junction,which used palmyra sugar as the carbon source and ammonium hydroxide(NH4OH)as the dopant source,was successfully deposited on the ITO glass substrate using the nano-spraying *** current-voltage relationship of the junction was found to be a Schottky-like contact,and therefore the junction shows the characteristic *** means the a-C and a-C:N are semiconductors with different types of ***,the samples showed an increase in current and voltage value when exposed to visible light(bright state)compared to the dark condition,thereby,indicating the creation of electron-hole pairs during the *** was also discovered that the relationship between current and voltage for the a-C/a-C:N junction sample formed a curve that satisfies the rule of the photovoltaic effect when exposed to visible light from a light *** exposure of this sample to direct sunlight at AM 1.5 conditions produced a curve that meets the rules for the emergence of the photovoltaic effect with higher characteristics for the current-voltage ***,the a-C/a-C:N junction sample is a solar cell successfully fabricated using a sample method and has a maximum efficiency of 0.0013%.

关键词： Solar cell amorphous carbon palmyra sugar

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