Three-dimensional-printed Ni-based scaffold design accelerates bubble escape for ampere-level alkaline hydrogen evolution reaction  

作　　者：Jingxuan Chen Gangwen Fu Yu Tian Xingchuan Li Mengqi Luo Xiaoyu Wei Ting Zhang Tian Gao Cheng Chen Somboon Chaemchuen Xi Xu Xing Sun Tongle Bu Francis Verpoort John Wang Zongkui Kou 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan,China [2]Marine New Materials and Equipment Technology Center,Sanya Science and Education Innovation Park of Wuhan University of Technology,Sanya,China [3]Frontiers Science Center for Flexible Electronics,Institute of Flexible Electronics,Northwestern Polytechnical University,Xi'an,China [4]Key laboratory of Flexible Electronics of Zhejiang Province,Ningbo Institute of Northwestern Polytechnical University,Ningbo,China [5]School of Astronautics,Northwestern Polytechnical University,Xi'an,China [6]Department of Materials Science and Engineering,College of Design and Engineering,National University of Singapore,Singapore,Singapore [7]National University of Singapore(Chongqing)Research Institute,Chongqing Liang Jiang New Area,Chongqing,China

出　　处：《Interdisciplinary Materials》2024年第4期595-606,共12页交叉学科材料（英文）

基　　金：Natural Science Foundation of Hainan Province,Grant/Award Number:623MS068;Fundamental Research Funds for the Central Universities,Grant/Award Number:40120631;Natural Science Foundation of Hubei Province,Grant/Award Number:2022CFB388;National Natural Science Foundation of China,Grant/Award Number:52202291;Singapore MOE,Grant/Award Number:Tier 1,A-8000186-01-00。

摘　　要：Alkaline hydrogen evolution reaction(HER)for scalable hydrogen production largely hinges on addressing the sluggish bubble-involved kinetics on the traditional Ni-based electrode,especially for ampere-level current densities and beyond.Herein,3D-printed Ni-based sulfide(3DPNS)electrodes with varying scaffolds are designed and fabricated.In situ observations at microscopic levels demonstrate that the bubble escape velocity increases with the number of hole sides(HS)in the scaffolds.Subsequently,we conduct multiphysics field simulations to illustrate that as the hole shapes transition from square,pentagon,and hexagon to circle,where a noticeable reduction in the bubble-attached HS length and the pressure balance time around the bubbles results in a decrease in bubble size and an acceleration in the rate of bubble escape.Ultimately,the 3DPNS electrode with circular hole configura-tions exhibits the most favorable HER performance with an overpotential of 297 mV at the current density of up to 1000 mA cm^(-2) for 120 h.The present study highlights a scalable and effective electrode scaffold design that promotes low-cost and low-energy green hydrogen production through the ampere-level alkaline HER.

关 键 词：3D printing alkaline hydrogen evolution reaction ampere-level current densities bubble escape hole sides 

分 类 号：TB34[一般工业技术—材料科学与工程]