https://pubs.kist.re.kr/handle/201004/153342 Tue, 14 Apr 2026 20:44:31 GMT 2026-04-14T20:44:31Z https://pubs.kist.re.kr/handle/201004/154489 Title: Regulating the d-band center of high valent Ru-doped NiCoP for efficient electrocatalyst in robust anion exchange membrane water electrolysis devices Authors: Le, Quang Tien Thinh; Nguyen, Thanh Tuan; Tran, Khoa Dang; Ngo, Quynh Phuong; Tran, Duy Thanh; Kim, Nam Hoon; Lee, Joong Hee Abstract: Hydrogen energy is emerging as a promising alternative to fossil fuels due to its high energy carrier and zero-carbon emissions. However, producing green hydrogen remains a challenging task, with high costs and poor durability of catalysts. Herein, a novel strategy is proposed to regulate the electronic configuration of Ru on the NiCoP framework and maximize active sites. Theoretical calculation demonstrated that the incorporation of Ru atoms could adjust the d-band center and strengthen the adsorption of intermediated species on the catalyst surface. Additionally, the Ru-NiCoP catalyst enables electron transport and immobilizes electrode during the electrolysis process. The 10Ru-NiCoP catalyst required overpotentials of 42 and 230 mV to obtain a current density of 10 mA cm−2 for HER and OER. The water-splitting cell based on 10Ru-NiCoP bifunctional catalyst required a minimal potential of 1.49 V to achieve a current density of 10 mA cm−2 with an excellent retention of 80 % after continuously operating for 50 h. Notably, the anion-exchange membrane water electrolysis cell achieved a minimal voltage of 1.964 V at 0.8 A cm−2 and exhibited a slight degradation of 7 % after operation for 1000 h. Wed, 01 Oct 2025 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/154489 2025-10-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/154465 Title: Unlocking the potential of sodium-ion batteries: Synthesizing sodium iron silicate cathodes using aliphatic diols Authors: Singh, Lalit Kumar; Verma, Deepak; Yoon, Wonjoong; Sarofil, Anith Dzhanxinah Mohd; Kim, Mingony; Jena, Sambedan; Chung, Kyung Yoon; Kim, Jaehoon Abstract: Nanostructured Na2FeSiO4 (NFS) cathodes are synthesized using diol-assisted hydrothermal processing followed by calcination, employing 1,2-ethanediol, 1,4-butanediol, and 1,6-hexanediol serving as both solvents and carbon sources. The morphology, crystal structure, and electrochemical properties are tuned by systematically varying the diol carbon chain length and the calcination temperature. The synthesized nanosheet architecture incorporates defective nanocarbon and features varying thicknesses and surface areas. The coordination environments and oxidation states of Fe2+/Fe3+ link phase evolution with coordinated water removal and hydroxyl group transformations during thermal treatment. Electrochemical tests demonstrate the superior rate capability and cycling stability of the optimized cathode, with an initial discharge capacity of 141.4 and 88.5 mAh g−1 and a capacity retention of 89.3 % and 98.6 % after 150 cycles at 0.1C and 0.4C, respectively. At a high rate of 7C, this cathode also achieves an initial capacity of 56.5 mAh g−1 and retains 77.1 % of it over 600 cycles. Such enhanced performance is attributed to optimized crystallinity, reduced charge-transfer resistance, improved sodium-ion diffusion, and interfacial charge storage. These findings underscore the potential of NFS as a high-rate, long-cycle cathode for sodium-ion batteries and provide a framework for the rational design of next-generation energy-storage materials. Wed, 01 Oct 2025 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/154465 2025-10-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/154364 Title: Oxide-hybridized carbon as a catalyst support for efficient anion exchange membrane water electrolysis Authors: Park, Jong Seok; Lim, Hyung-Kyu; Hu, Chuan; Lee, Eungjun; Jeon, Hyo Sang; Ryu, Jongkyung; Oh, Sion; Lee, Tae Kyung; Park, Subin; Cho, Hyeon Keun; Yu, Seung-Ho; Ahn, Docheon; Lee, Young Moo; Kim, Myeong-Geun; Yoo, Sung Jong Abstract: The performance of anion exchange membrane water electrolysis, a key technology for achieving net-zero carbon emissions, can be improved by introducing an appropriate catalyst support. However, the ideal support material for water electrolysis remains debatable. Recent efforts focused on enhancing the corrosion resistance by using highly crystalline carbon as a carbon-based support. Despite this progress, the defects intrinsic to carbon emphasize the need for effective passivation strategies to ensure long-term stability and reliability. Addressing this challenge, here we introduce Ti to passivate these surface defects, resulting in oxide-hybridized supports with significantly improved corrosion resistance. The layered double hydroxide catalyst loaded on the Ti-hybridized carbon demonstrates notable performance (8.5 A cm-2 at 2 V) and durability (0.17 mV h-1 over 900 h at 1 A cm-2). The enhanced activity can be attributed to the efficient OH- supply, as confirmed by in-situ Fourier-transform infrared spectroscopy measurements and theoretical calculations. This study provides a foundation for the development of advanced catalyst supports for water electrolysis. Mon, 01 Dec 2025 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/154364 2025-12-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/154347 Title: 상용 아연 음극의 제조사별 결정배향 특성과 열처리에따른 전기화학적 수명 개선 효과 분석 Authors: 김민우; 신성희; 김예원; 김형석 Abstract: 수계 아연 전지는 수지상 성장과 ZHS 부산물 축적으로 수명이 저하된다. 본 연구에서는 제조사별 상용아연 호일의 (002)면 우선 배향성을 비교하고, 열처리를 통한 과전압 안정화 효과를 분석하였다. 열처리로 인하여 (002)면 배향 저하로 ZHS 축적 및 수명 감소가 나타났다. Mon, 01 Dec 2025 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/154347 2025-12-01T00:00:00Z