Iridium‐Based Multimetallic Porous Hollow Nanocrystals for Efficient Overall‐Water‐Splitting Catalysis,Advanced Materials

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Iridium‐Based Multimetallic Porous Hollow Nanocrystals for Efficient Overall‐Water‐Splitting Catalysis
Advanced Materials ( IF 27.4 ) Pub Date : 2017-10-30 , DOI: 10.1002/adma.201703798
Jianrui Feng ₁ , Fan Lv ₁ , Weiyu Zhang ₁ , Peihao Li ₁ , Kai Wang ₁ , Chao Yang ₁ , Bin Wang ₁ , Yong Yang ₁ , Jinhui Zhou ₁ , Fei Lin ₁ , Gui-Chang Wang ₂ , Shaojun Guo _{1,

3}

Affiliation

The development of active and durable bifunctional electrocatalysts for overall water splitting is mandatory for renewable energy conversion. This study reports a general method for controllable synthesis of a class of IrM (M = Co, Ni, CoNi) multimetallic porous hollow nanocrystals (PHNCs), through etching Ir‐based, multimetallic, solid nanocrystals using Fe³⁺ ions, as catalysts for boosting overall water splitting. The Ir‐based multimetallic PHNCs show transition‐metal‐dependent bifunctional electrocatalytic activities for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in acidic electrolyte, with IrCo and IrCoNi PHNCs being the best for HER and OER, respectively. First‐principles calculations reveal a ligand effect, induced by alloying Ir with 3d transition metals, can weaken the adsorption energy of oxygen intermediates, which is the key to realizing much‐enhanced OER activity. The IrCoNi PHNCs are highly efficient in overall‐water‐splitting catalysis by showing a low cell voltage of only 1.56 V at a current density of 2 mA cm⁻², and only 8 mV of polarization‐curve shift after a 1000‐cycle durability test in 0.5 m H₂SO₄ solution. This work highlights a potentially powerful strategy toward the general synthesis of novel, multimetallic, PHNCs as highly active and durable bifunctional electrocatalysts for high‐performance electrochemical overall‐water‐splitting devices.

中文翻译：

铱基多金属多孔中空纳米晶体，可有效促进整体水分解催化

开发用于整体水分解的活性和耐用双功能电催化剂对于可再生能源转化是必不可少的。这项研究报告了通过使用Fe ³⁺蚀刻Ir基多金属固体纳米晶体来控制合成IrM（M = Co，Ni，CoNi）一类多金属多孔纳米晶体（PHNC）的一般方法。离子，作为促进整体水分解的催化剂。基于Ir的多金属PHNC对酸性电解质中的氢释放反应（HER）和氧释放反应（OER）都具有过渡金属依赖性的双功能电催化活性，其中IrCo和IrCoNi PHNC分别对HER和OER最佳。第一性原理计算表明，通过将Ir与3d过渡金属合金化而引起的配体效应可以削弱氧中间体的吸附能，这是实现大大增强的OER活性的关键。IrCoNi PHNC通过在2 mA cm ^-2的电流密度下仅显示1.56 V的低电池电压，在1000次循环的耐久性测试后仅显示8 mV的极化曲线偏移，从而在整体水分解催化中具有很高的效率。在0.5 mH ₂ SO ₄溶液。这项工作突出了一种潜在的强大策略，该策略可用于新型，多金属，PHNC的一般合成，作为高性能高性能电化学整体水分解装置的高活性和耐用性双功能电催化剂。

更新日期：2017-10-30

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