文献类型：期刊文献

英文题名：Enhanced Orr Performance with N-Doped Pt@Ni-Ac Composites Towards Highly Active and Stable Catalysts

作者：Mushtaq, Muhammad Umair[1]; Lin, Zhu[1]; Li, Danni[1]; Ayub, Khurram Shahzad[1,2]; Abbas, Zain[1,4]; Zaman, Waqas Qamar[3]; Yang, Ji[1,5]

机构：[1] School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China; [2] Department of Chemical Engineering, University of Gujrat, Hafiz Hayat Campus, Gujrat, 50700, Pakistan; [3] Institute of Environmental Sciences and Engineering, National University of Sciences and Technology [NUST], Sector, H?12 Main Campus, Islamabad, 44000, Pakistan; [4] Research Centre, Forward Sports Private Limited, Sialkot, Pakistan; [5] Shanghai Institute of Pollution Control and Ecology Security, Shanghai, 20092, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240088517)

语种：英文

外文关键词：Activated carbon - Binary alloys - Catalyst activity - Doping (additives) - Electrocatalysis - Electrolytic reduction - Nanoparticles - Oxygen - Platinum alloys - Synthesis (chemical)

摘要：The sluggish oxygen reduction reaction (ORR) presents a critical bottleneck in many emerging electrochemical energy conversion technologies, demanding innovative catalysts to overcome kinetic limitations and optimize resource utilization. This study evaluated N-doped Pt nanoparticles supported on Ni-AC (activated carbon) as an ORR catalyst. Nanoparticles were synthesized through annealing Pt in an N2 atmosphere, followed by clustering the Pt Ni-coated AC. Electrochemical results showed that Pt-Ni compositions optimized better ORR performance. Among the catalysts examined, Pt0.25Ni0.75-AC demonstrated superior activity, followed closely by Pt0.15Ni0.85-AC, exhibiting marked halfwave potential (799 and 710 mV) specific activities (69.39 and 56.09 Ag-1) and minimal Tafel slope (-63 and -88 mV dec-1) against Pt-AC (636 mV vs. RHE, 40.2 Ag-1 mV and -88 mV dec-1), respectively. Markedly, in long-term stability testing over 40,000 cycles, Pt-AC suffered performance fluctuations while Pt0.25Ni0.75-AC retained over 90% of its initial activity. This highlights the stability enhancement imparted by the Ni incorporation. XAS and XPS validated the incorporation of Ni while SEM, and HRTEM with three-dimensional imaging confirmed the Pt clustering on the Pt Ni-coated AC and formation of a layered structure. Overall, results confirm N-doped Pt clusters supported on Ni-AC as highly active and robust oxygen reduction catalysts. ? 2024, The Authors. All rights reserved.