Tong, Jun Won, Ji-eun Ni, Na Chae, Keun Hwa Reddy, Kolan Madhav Park, Youngjin Sangavadekar, Sayali Chang, Hye Jung Zhou, Baowen Cao, Rongchang Yoon, Kyung Joong Zhu, Lei Huang, Zhen 2025-09-22T02:01:17Z 2025-09-22T02:01:17Z 2025-09-16 2025-09 1936-0851 https://pubs.kist.re.kr/handle/201004/153201 Coelectrolysis of H2O and CO2 using high-temperature solid oxide cells offers a highly efficient solution for converting greenhouse gases into valuable fuels and chemicals. Although Pt is an effective catalyst for this reaction, its high cost has limited its usage. Herein, we present that Pt-containing alloy catalysts with increased entropy exhibit high Pt utilization efficiency, catalytic performance, and thermal stability. Ab initio molecular dynamics and density functional theory simulations predict that the entropy enhancement strategy can stabilize Pt and provide catalytic properties comparable to those of pure Pt metal, while substantially reducing the required amount of Pt. These 10-nm-sized alloy catalysts were synthesized in situ within the porous fuel electrode and supported on a gadolinia-doped ceria scaffold using an advanced infiltration technique. The employment of the catalyst enabled a distinct improvement in cell performance compared to the widely adopted electrode material, and the Pt usage can be successfully reduced by 80% with a similar performance to pure Pt. Moreover, this process was successfully scaled up to industrial-sized cells with an active area of 16 cm2, resulting in a high coelectrolysis current density of 1.6 A/cm2 at 1.5 V and 850 degrees C. Notably, the catalyst demonstrated stable operation for over 200 h at a high current density of 1 A/cm2 and 850 degrees C with negligible deterioration, verifying its feasibility for practical applications. English American Chemical Society Entropy-Enhancing Strategy Enables Highly Efficient Pt Utilization for High-Temperature H2O-CO2 Coelectrolysis Article 10.1021/acsnano.5c12777 1 ACS Nano, v.19, no.36, pp.32956 - 32966 ACS Nano 19 36 32956 32966 N scie scopus 001565466100001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article; Early Access OXIDE ELECTROLYSIS CELLS TOTAL-ENERGY CALCULATIONS CO-ELECTROLYSIS CATALYSTS H2O LA0.6SR0.4COO3-DELTA REDUCTION CHROMIUM SOEC coelectrolysis entropy-enhancing strategy Pt utilization infiltration