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In Situ Formed Bimetallic Carbide Ni6Mo6C Nanodots and NiMoOx Nanosheet Array Hybrids Anchored on Carbon Cloth: Efficient and Flexible Self-Supported Catalysts for Hydrogen Evolution
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-09-10 , DOI: 10.1021/acscatal.0c03355 Xiaozhong Zheng 1 , Yuzhuo Chen 1 , Xiaobing Bao 1 , Shanjun Mao 1 , Ruxue Fan 1 , Yong Wang 1
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-09-10 , DOI: 10.1021/acscatal.0c03355 Xiaozhong Zheng 1 , Yuzhuo Chen 1 , Xiaobing Bao 1 , Shanjun Mao 1 , Ruxue Fan 1 , Yong Wang 1
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Water electrolysis is a promising technique to produce high-quality hydrogen. However, the design and synthesis of high-performance nonprecious metal catalysts for the hydrogen evolution reaction are still confronted with challenges because of their high overpotential and poor flexibility. We herein reported in situ formed bimetallic carbide Ni6Mo6C nanodot and NiMoOx nanosheet array hybrid electrocatalyst supported on activated carbon cloth (Ni6Mo6C/NiMoOx/ACC), which is manufactured by controlling the diffusion of carbon atoms into precursor NiMoO4 nanosheets from activated carbon cloth to produce active species bimetallic carbide during annealing in a H2 atmosphere. The unique hierarchical structure of NiMoOx nanosheet arrays grown on ACC could significantly promote both mass transport and electric conductivity, and the embedded Ni6Mo6C with moderated hydrogen adsorption ability (ΔGH* = −0.13 eV) and low water dissociation barrier (ΔGb = 0.27 eV) exhibited remarkable performance and durability for the hydrogen evolution reaction (HER). Optimal Ni6Mo6C/NiMoOx/ACC demonstrates zero onset overpotential and an overpotential of only 29 mV at a current density of 10 mA cm–2 with long-term stability (60 h loss-free continuous operation) in 1.0 M KOH solution, even surpassing the benchmark Pt/C catalyst. Especially, the as-made electrocatalyst shows robust flexibility and its high electrocatalytic performance almost keeps constant under distorted states, thus meeting the requirements of flexible electrocatalysts such as bendability. These findings afford a new idea to integrally construct highly efficient flexible electrocatalysts.
中文翻译：
碳布上锚固的原位形成双金属碳化物Ni 6 Mo 6 C纳米点和NiMoO x纳米片阵列杂化物：高效，灵活的自支撑氢析出催化剂
水电解是产生高质量氢的有前途的技术。然而，用于氢析出反应的高性能非贵金属催化剂的设计和合成由于其过高的电势和较差的柔韧性仍面临挑战。我们在这里报道了原位形成的双金属碳化物Ni 6 Mo 6 C纳米点和负载在活性炭布上的NiMoO x纳米片阵列混合电催化剂（Ni 6 Mo 6 C / NiMoO x / ACC），其通过控制碳原子扩散进入前驱体NiMoO 4活性炭布制成的纳米片，在H 2气氛中退火期间产生活性物质双金属碳化物。在ACC上生长的NiMoO x纳米片阵列的独特分层结构可以显着促进质量传输和电导率，并且嵌入的Ni 6 Mo 6 C具有适度的氢吸附能力（ΔG H * = -0.13 eV）和低水解离势垒（Δ g ^ b = 0.27 eV）的表现出显着的性能和耐用性为析氢反应（HER）。最佳Ni 6 Mo 6 C / NiMoO x/ ACC在1.0 M KOH溶液中具有10厘米cm –2的电流密度时具有零起始超电势和29 mV的超电势，具有长期稳定性（60小时无损耗连续运行），甚至超过了基准Pt / C催化剂。尤其是，制成的电催化剂显示出鲁棒的柔韧性，并且其高电催化性能在变形状态下几乎保持恒定，因此满足了挠性电催化剂的要求，例如可弯曲性。这些发现为整体构建高效的柔性电催化剂提供了新的思路。
更新日期：2020-10-02
中文翻译：
碳布上锚固的原位形成双金属碳化物Ni 6 Mo 6 C纳米点和NiMoO x纳米片阵列杂化物：高效，灵活的自支撑氢析出催化剂
水电解是产生高质量氢的有前途的技术。然而，用于氢析出反应的高性能非贵金属催化剂的设计和合成由于其过高的电势和较差的柔韧性仍面临挑战。我们在这里报道了原位形成的双金属碳化物Ni 6 Mo 6 C纳米点和负载在活性炭布上的NiMoO x纳米片阵列混合电催化剂（Ni 6 Mo 6 C / NiMoO x / ACC），其通过控制碳原子扩散进入前驱体NiMoO 4活性炭布制成的纳米片，在H 2气氛中退火期间产生活性物质双金属碳化物。在ACC上生长的NiMoO x纳米片阵列的独特分层结构可以显着促进质量传输和电导率，并且嵌入的Ni 6 Mo 6 C具有适度的氢吸附能力（ΔG H * = -0.13 eV）和低水解离势垒（Δ g ^ b = 0.27 eV）的表现出显着的性能和耐用性为析氢反应（HER）。最佳Ni 6 Mo 6 C / NiMoO x/ ACC在1.0 M KOH溶液中具有10厘米cm –2的电流密度时具有零起始超电势和29 mV的超电势，具有长期稳定性（60小时无损耗连续运行），甚至超过了基准Pt / C催化剂。尤其是，制成的电催化剂显示出鲁棒的柔韧性，并且其高电催化性能在变形状态下几乎保持恒定，因此满足了挠性电催化剂的要求，例如可弯曲性。这些发现为整体构建高效的柔性电催化剂提供了新的思路。
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