Bhandari Ganesh, Dhakal Purna Prasad, Tran Duy Thanh, Nguyen Thanh Hai, Dinh Van An, Kim Nam Hoon, Lee Joong Hee
Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea.
Department of Precision Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan.
Small. 2024 Dec;20(50):e2405952. doi: 10.1002/smll.202405952. Epub 2024 Oct 8.
Enhancement of an alkaline water splitting reaction in Pt-based single-atom catalysts (SACs) relies on effective metal-support interactions. A Pt single atom (Pt)-immobilized three-phased Pt@VP-NiP-MoP heterostructure on nickel foam is presented, demonstrating high catalytic performance. The existence of Pt on triphasic metal phosphides gives an outstanding performance toward overall water splitting. The Pt@VP-NiP-MoP performs a low overpotential of 28 and 261 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at a current density of 10 and 25 mA cm, respectively. The Pt@VP-NiP-MoP (+,-) alkaline electrolyzer achieves a minimum cell voltage of 1.48 V at a current density of 10 mA cm for overall water splitting. Additionally, the electrocatalyst exhibits a substantial Faradaic yield of ≈98.12% for H and 98.47% for O at a current density of 50 mA cm. Consequently, this study establishes a connection for understanding the active role of single metal atoms in substrate configuration for catalytic performance. It also facilitates the successful synthesis of SACs, with a substantial loading on transition metal phosphides and maximal atomic utilization, providing more active sites and, thereby enhancing electrocatalytic activity.
基于铂的单原子催化剂（SACs）中碱性水分解反应的增强依赖于有效的金属-载体相互作用。本文报道了一种固定在泡沫镍上的三相Pt@VP-NiP-MoP异质结构的铂单原子（Pt），展示出了高催化性能。三相金属磷化物上Pt的存在对整体水分解表现出优异的性能。在电流密度为10和25 mA cm时，Pt@VP-NiP-MoP对析氢反应（HER）和析氧反应（OER）的过电位分别为28和261 mV。Pt@VP-NiP-MoP（+，-）碱性电解槽在电流密度为10 mA cm时，整体水分解的最小电池电压为1.48 V。此外，在电流密度为50 mA cm时，该电催化剂对H的法拉第产率约为98.12%，对O的法拉第产率为98.47%。因此，本研究建立了一种联系，有助于理解单金属原子在底物构型中对催化性能的积极作用。它还促进了SACs的成功合成，在过渡金属磷化物上有大量负载且原子利用率最高，提供了更多活性位点，从而增强了电催化活性。
