Optimizing "Artificial Leaf" Photoanode-Photocathode-Catalyst Interface Systems for Solar Water Splitting
Optimizing "Artificial Leaf" Photoanode-Photocathode-Catalyst Interface Systems for Solar Water Splitting
复制标题
优化太阳能水分解的“人造叶”光电阳极-光电阴极-催化剂界面系统
DOI：
10.1149/07237.0001ecst
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Greenblatt, M.
中科院分区：
文献类型：
--
作者：
Porter, S. H.;Hwang, S.;Amarasinghe, V.;Taghaddos, E.;Manichev, V.;Li, M.;Gardner, G.;Safari, A.;Garfunkel, E.;Greenblatt, M.
制备了一种新型双光吸收剂界面：沉积在硅（100）上的钙钛矿氮氧化物（SrNbO2N），以及H2ER催化剂光吸收剂界面：（Ni5P4或Ni2P）-硅。在 Sr2Nb2O7 和 Si (100) 之间引入氮化钛 (TiN) 作为阻挡层，从而产生干净的界面。在将 Sr2Nb2O7 转化为 SrNbO2N 所需的高温氨解步骤中，它可以有效阻止 Nb 和 Si（但不是 Sr）迁移。具有 H2ER 催化剂（Ni5P4 或 Ni2P）-光吸收剂界面的半电池阴极产生的 H2 接近薄膜的同类最佳过电势（Ni5P4：211mV vs RHE at 10mV/cm 2），塔菲尔斜率为 50mV/decade。除了电解过程中去除的表面磷酸盐外，薄膜是原子级光滑的。
A novel dual photoabsorber interface: perovskite oxynitride (SrNbO2N) deposited on silicon (100), and a H2ER catalyst photoabsorber interface:(Ni5P4 or Ni2P)-silicon, are fabricated. Titanium nitride (TiN) is introduced as a blocking layer between Sr2Nb2O7 and Si (100), which produces clean interfaces. During the high temperature ammonolysis step needed to convert Sr2Nb2O7 to SrNbO2N, it is effective at blocking Nb and Si (but not Sr) migration. A half-cell cathode with the H2ER catalyst (Ni5P4 or Ni2P)-photoabsorber interface produces H2 approaching best-in-class overpotentials for films (Ni5P4: 211mV vs RHE at 10mV/cm 2) with a 50mV/decade Tafel slope. Films are atomically smooth, except for surface phosphate that is removed during electrolysis.