Simulated biogas with 0.5 CO2 to CH4 ratio was used to fuel NiYSZ-based anode supported SOFC at 750oC for 22 hours. Operation on biogas was carried out after 26 hours stabilization on H2. Sn doping by infiltration technique on NiYSZ anode surface produced 4.5 times higher cell electrical performance on biogas compared to the performance of un-doped NiYSZ cell. SnNiYSZ cell showed no carbon deposited while NiYSZ cell showed 0.17mg carbon/cm2 cell. This paper presents cell electrical performance data supported by impedance spectra and mass spectra of fuel cell outlet gases. The findings in this paper may bring efforts for making biogas fuelled SOFC closer to being operable.

Produksi olahan pangan dari buah-buahan selalu menghasilkan limbah kulit dalam pengolahannya. Limbah tersebut hanya dibuang dan dibiarkan menumpuk begitu saja oleh mansyarakat. Apabila tidak ditangani secara cepat akan menghasilkan bau yang tidak sedap sehingga akan mencemari lingkungan. Salah satu alternatif yang dapat dilakukan yaitu dengan cara mengolah limbah tersebut menjadi pupuk organik cair dengan proses fermentasi. Penelitian ini dilakukan untuk mengetahui kandungan hara makro dan kualitas dari pupuk organik cair, mengetahui waktu fermentasi optimum, harga pokok produksi dan BEP dari proses pembuatan pupuk organik cair. Penelitian ini dilakukan dengan cara menambahkan EM4, ragi, dan air gula ke dalam reaktor yang berisi limbah kulit buah yaitu kulit pisang, mangga dan nanas. Proses fermentasi dilakukan selama 34 hari dan dilakukan pengambilan sampel pada hari ke-7, 14, 24 dan 34 untuk dianalisis kandungan hara makro yang terdiri dari C-Organik, P, dan K dengan metode spektrofotometri UV/VIS, SSA dan N dengan metode Kjeldahl. Pada penelitian ini dihasilkan pupuk organik cair yang terbaik yaitu campuran limbah kulit pisang, mangga dan nanas dengan waktu fermentasi 7-14 hari dan kandungan unsur C-Organik, N-total, K2O, dan P2O5 masing-masing sebesar 17,4; 6,05; 2,50 dan 0,15 %. Pupuk organik cair yang dihasilkan sudah memenuhi baku mutu dari Permentan Nomor 261 tahun 2019 kecuali kandungan P2O5, walaupun demikian pupuk organik cair yang diperoleh ini memiliki kualitas yang lebih baik dibanding beberapa pupuk yang sudah dijual secara komersial. Biaya pokok produksi dari pembuatan POC ini sebesar Rp 770.554 dengan Break Event Point (BEP) pada 10 liter.

No abstract

Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

Link to publication on Research at Birmingham portal General rightsUnless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law.• Users may freely distribute the URL that is used to identify this publication.• Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research.• User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain.Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document.When citing, please reference the published version. Take down policyWhile the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

Solid Oxide Fuel Cells (SOFCs) offer their ability to directly convert hydrocarbon fuel into electricity via internal dry reforming. NiYSZ-based SOFC anodes were manufactured via aqueous tape casting. Raw materials such as NiO and yttria-stabilized ZrO2 powders, glycerol, polyvinyl alcohol (PVA), and water were weighed and mixed. The obtained slurry was ball milled for 12 hours, de-gassed, tape-cast, and dried at ambient temperature to obtain smooth, crack-free, elastic, and easy to remove green tapes. The good green tapes were then sintered at 1200˚C. The sintered tapes were characterized for their morphology, topography, and composition by using SEM/EDX. The hardness uses Vickers hardness tests while the electrical conductivity at 600-800 o C uses a special furnace and a multimeter. On the other hand, the porosity is being tested by the Archimedes method. The results showed that good SOFC anode tapes were obtained after degassing in the range of 32 -125 hours depending on the amount of PVA and water added to the mixture. The resulting morphology and topography of the anode tapes were comparable with those of the reference anode tape, with pore sizes ranging from 100ɳm-1μm and 28% porosity (pore volume). The tapes' hardness after sintering was in the range of 170.3 HV and 212.2 HV. Under the condition, their conductivities were 0.098 Siemens and 0.529 Siemens at 750 o C and 800 o C respectively. The successful attempts to make NiYSZ-based SOFC anodes using locally available materials and equipment are promising as the initial steps for further development of SOFC manufacturing in Indonesia. The developed SOFC will be further tested as a Solid Oxide Electrolyser Cell (SOEC) to produce hydrogen.

Bunga telang (Clitoria ternatea) merupakan tanaman yang mudah dibudidayakan. Bunganya yang unik  berwarna biru dapat dijadikan zat warna alami untuk berbagai jenis makanan dan minuman. Kandungan antoksidan yang tinggi dalam bunga telang menjadikan bunga ini menjadi trendi sebagai minuman herbal untuk meningkatkan imun tubuh di masa pandemi ini. Sehubungan dengan hal ini maka bunga telang dapat menjadi peluang usaha untuk petani khususnya Kelompok Wanita Tani Rengganis yang ada di Desa Arjasari Kabupaten Bandung. Untuk meningkatkan usaha pembuatan serta meningkatkan mutu tanaman herbal khususnya bunga telang, Politeknik Negeri Bandung (Polban) melalui program Pengabdian Kepada Masyarakat (PkM) memberikan penyuluhan yang mencakup pengenalan herbal dan manfaatnya, penanaman secara organik menggunakan pupuk organik cair, teknik pengeringan dan pengolahan  bunga telang yang  dapat menghasilkan berbagai produk berbahan dasar bunga telang, serta teknik pemasaran untuk memanfaatkan peluang bisnis dari bunga telang. Kegiatan ini   mendapat respon dan  antusiasme yang tinggi dari masyarakat setempat, karena secara umum peluang usaha ini sesuatu yang baru untuk mereka. Berdasarkan kuisioner yang dibagikan kepada peserta kegiatan ini diharapkan dapat berlanjut. Sehingga dapat meningkatkan kesehatan, kesejahteraan serta perekonomian masyarakat Desa Arjasari dan sekitarnya.

The unprecedented reduction in the availability of fossil fuels requires the research community to find safe, clean, renewable and sustainable energy sources. One promising source is microalgae biofuel, which can reduce environmental problems and energy crises due to its closed carbon cycle. Selecting the right strain and optimizing lipid productivity are very important for the success of the biodiesel conversion process economically. In this study, the lipid extraction process from Aphanothece sp. dry biomass which was previously grown in photobioreactor systems with atmospheric carbon dioxide feed inputs was carried out using the ultrasound method, with variations of solvent systems. The maximum lipid extract yield of about 40.79 ± 0.76 percent DW, w/w was obtained for the dichloromethane/methanol ratio of 1:2 (v/v).