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Lattice Strain Engineering of Ni2P Enables Efficient Catalytic Hydrazine Oxidation-Assisted Hydrogen Production
Advanced Materials ( IF 27.4 ) Pub Date : 2023-07-11 , DOI: 10.1002/adma.202305598 Chao Feng 1, 2 , Miaoyuan Lv 1 , Jiaxin Shao 1 , Hanyang Wu 1 , Weiliang Zhou 1 , Shuai Qi 1 , Chen Deng 1 , Xiaoyan Chai 1 , Hengpan Yang 1 , Qi Hu 1 , Chuanxin He 1
Advanced Materials ( IF 27.4 ) Pub Date : 2023-07-11 , DOI: 10.1002/adma.202305598 Chao Feng 1, 2 , Miaoyuan Lv 1 , Jiaxin Shao 1 , Hanyang Wu 1 , Weiliang Zhou 1 , Shuai Qi 1 , Chen Deng 1 , Xiaoyan Chai 1 , Hengpan Yang 1 , Qi Hu 1 , Chuanxin He 1
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Hydrazine-assisted water electrolysis provides new opportunities to enable energy-saving hydrogen production while solving the issue of hydrazine pollution. Here, the synthesis of compressively strained Ni2P as a bifunctional electrocatalyst for boosting both the anodic hydrazine oxidation reaction (HzOR) and cathodic hydrogen evolution reaction (HER) is reported. Different from a multistep synthetic method that induces lattice strain by creating core–shell structures, a facile strategy is developed to tune the strain of Ni2P via dual-cation co-doping. The obtained Ni2P with a compressive strain of −3.62% exhibits significantly enhanced activity for both the HzOR and HER than counterparts with tensile strain and without strain. Consequently, the optimized Ni2P delivers current densities of 10 and 100 mA cm−2 at small cell voltages of 0.16 and 0.39 V for hydrazine-assisted water electrolysis, respectively. Density functional theory (DFT) calculations reveal that the compressive strain promotes water dissociation and concurrently tunes the adsorption strength of hydrogen intermediates, thereby facilitating the HER process on Ni2P. As for the HzOR, the compressive strain reduces the energy barrier of the potential-determining step for the dehydrogenation of *N2H4 to *N2H3. Clearly, this work paves a facile pathway to the synthesis of lattice-strained electrocatalysts via the dual-cation co-doping.
中文翻译：
Ni2P 晶格应变工程可实现高效催化肼氧化辅助制氢
联氨辅助水电解为节能制氢同时解决联氨污染问题提供了新的机遇。在此，报道了压缩应变Ni 2 P作为双功能电催化剂的合成，用于促进阳极肼氧化反应（HzOR）和阴极析氢反应（HER）。与通过创建核壳结构来诱导晶格应变的多步合成方法不同，我们开发了一种简单的策略来通过双阳离子共掺杂来调节 Ni 2 P 的应变。所获得的压缩应变为-3.62%的Ni 2 P与具有拉伸应变和无应变的对应物相比，对于HzOR和HER均表现出显着增强的活性。因此，优化的Ni 2 P在0.16和0.39 V的小电池电压下分别为肼辅助水电解提供10和100 mA cm -2的电流密度。密度泛函理论（DFT）计算表明，压缩应变促进水解离，同时调节氢中间体的吸附强度，从而促进Ni 2 P上的HER过程。对于HzOR，压缩应变降低了势垒-确定*N 2 H 4脱氢为*N 2 H 3的步骤。显然，这项工作为通过双阳离子共掺杂合成晶格应变电催化剂铺平了一条简单的途径。
更新日期：2023-07-11
中文翻译：
Ni2P 晶格应变工程可实现高效催化肼氧化辅助制氢
联氨辅助水电解为节能制氢同时解决联氨污染问题提供了新的机遇。在此，报道了压缩应变Ni 2 P作为双功能电催化剂的合成，用于促进阳极肼氧化反应（HzOR）和阴极析氢反应（HER）。与通过创建核壳结构来诱导晶格应变的多步合成方法不同，我们开发了一种简单的策略来通过双阳离子共掺杂来调节 Ni 2 P 的应变。所获得的压缩应变为-3.62%的Ni 2 P与具有拉伸应变和无应变的对应物相比，对于HzOR和HER均表现出显着增强的活性。因此，优化的Ni 2 P在0.16和0.39 V的小电池电压下分别为肼辅助水电解提供10和100 mA cm -2的电流密度。密度泛函理论（DFT）计算表明，压缩应变促进水解离，同时调节氢中间体的吸附强度，从而促进Ni 2 P上的HER过程。对于HzOR，压缩应变降低了势垒-确定*N 2 H 4脱氢为*N 2 H 3的步骤。显然，这项工作为通过双阳离子共掺杂合成晶格应变电催化剂铺平了一条简单的途径。
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