https://scholar.dgist.ac.kr/handle/20.500.11750/235 2026-08-03T13:39:16Z https://scholar.dgist.ac.kr/handle/20.500.11750/60580 Title: 페로브스카이트 화합물을 포함하는 고분자 전해질막 연료전지용 첨가제 및 이를 포함하는 고분자 전해질막 연료전지 Author(s): 박주안; 유현진; 박권주; 한다빈; 상가라쥬샨무감 https://scholar.dgist.ac.kr/handle/20.500.11750/60572 Title: 레독스 흐름 전지용 분리막, 이의 제조 방법 및 이를 포함하는 레독스 흐름 전지 Author(s): 상가라쥬샨무감; Gikunoo Edzordzi Kwame Abstract: 본 발명의 다양한 실시예에 따른 레독스 흐름 전지용 분리막은, 술폰산 그룹이 도입된 PEEK(Polyether ether ketone) 및 탈불화수소 PVDF(polyvinylidene fluoride)를 포함할 수 있다. 본 발명의 다양한 실시예에 따른 레독스 흐름 전지용 분리막의 제조 방법은, 탈불화수소 PVDF 분말을 준비하는 단계; 술폰산 그룹이 도입된 PEEK를 준비하는 단계; 및 상기 탈불화수소 PVDF 분말 및 술폰산 그룹이 도입된 PEEK를 혼합하고 용액 캐스팅하는 단계를 포함할 수 있다. https://scholar.dgist.ac.kr/handle/20.500.11750/60543 Title: Efficient Electrochemical NO Reduction at Low Overpotential via Synergistic RuCu Alloy Nanoparticles Author(s): Jang, Seoyoung; Joo, Yong Lak; Shanmugam, Sangaraju Abstract: Ammonia (NH3) synthesis via electrochemical nitric oxide reduction (NORR) has emerged as a promising alternative to the Haber-Bosch process, which requires high temperatures and pressures. However, NORR still faces critical challenges, including side reactions, limited mass transfer, and high overpotential requirements. Transition metals have been widely employed to address these issues owing to their favorable NO adsorption properties; however, they suffer from intermediate overbinding and require high overpotentials to achieve meaningful catalytic activity. To overcome these limitations, we introduce a noble-metal alloying strategy that combines the high electron-transfer kinetics of noble metals with the tunable NO adsorption properties of transition metals, thereby synergistically enhancing catalytic activity for selective NH3 production. We designed Ru-Cu alloy nanoparticles supported on nitrogen-doped carbon nanorods (Ru x Cu100-x @NCNR), and the optimized Ru5Cu95@NCNR catalyst exhibited an ammonia yield of 32.66 +/- 4.38 mu mol cm-2 h-1 and a Faradaic efficiency of 94 +/- 1.25% (FENH3) at -0.2 V vs RHE, notably lower overpotential than that reported for conventional NORR catalysts, demonstrating energy-efficient ammonia production. Long-term stability tests confirmed the sustained catalytic performance, and its practical applicability was further validated through integration into a Zn-NO battery system, highlighting its potential for next-generation energy conversion devices. Mechanistic investigations revealed that precise control of Ru content induces structural modulation of the RuCu alloy, thereby regulating the strength of NO adsorption and facilitating efficient protonation, ultimately governing high NH3 selectivity. 2026-05-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60539 Title: Stabilizing Highly Sulfonated Poly(ether ether ketone) Membranes with Polybenzimidazole for Zinc-Bromine Redox Flow Batteries Author(s): Jannah, Sifathul; Kim, Minji; Shanmugam, Sangaraju Abstract: Zinc-bromine redox flow batteries (ZBRFBs) suffer from membrane degradation under bromine-rich operating conditions. Highly sulfonated poly(ether ether ketone) (SPEEK) at DS approximate to 75-79% offers superior ionic conductivity but undergoes excessive swelling and mechanical failure in ZBRFB electrolytes. Here, we report the first systematic application of Na+-pretreated SPEEK/polybenzimidazole (PBI) blend membranes to ZBRFBs, where Na+-ion exchange pretreatment enables homogeneous blending of these otherwise incompatible polymers. The optimized SPEEK/PBI 2.5 wt % membrane achieves a 3-fold reduction in Br-2 permeability and improves energy efficiency from 83.6% to 88.4%, retaining 94.22% discharge capacity after 280 cycles versus 54% at failure for pristine SPEEK at cycle 85. Postmortem analysis confirms reduced desulfonation and improved morphological integrity, consistent with the acid-base network reinforcement by PBI. These results demonstrate that controlled PBI blending effectively extends the usable DS range of SPEEK in harsh bromine-containing electrolytes. 2026-04-30T15:00:00Z